Atara Biotherapeutics (ATRA) insider trading activity: Get Latest News Today

ATRA Stock Outstanding Shares

Making an investment decision in the stock market involves a certain amount of risk, so it's important to thoroughly review a company's stock before making any decisions. Stock float, number of short positions and outstanding shares are among the many factors an investor should take into account.

ShortableYes

OptionableNo

Short Percent Of Outstanding Shares11.21

Short Percent Of Float11.36

Shares Outstanding5.76M

Shares Float4.07M

Shares Short636.28K

Short Ratio7.11

11.36%

Short % of Float

11.21%

Short % of Shares Outstanding

Market Insider ATRA

Investors cannot turn a blind eye to insiders as well as institutional ownership. They need to follow insider trades to determine the direction the stock is likely to take.

Major Holders Summary

21.98% Percentage of Shares held by All Insiders

50.5% Percentage of Shares held by All Institutions

64.73% Percentage of Float held by Institutions

Number of Institutions Holding Shares

Institutional Ownership

About 50.5% of ATRA shares are held by financial institutions. BLACKROCK INC. is the top corporate investor, holding 6.83M shares valued at $4.74M. A 6.45% stake in Atara Biotherapeutics, Inc. is owned by the company. REDMILE GROUP, LLC owns 9.26M shares valued at $6.43M, which translates its holding of 8.75% of the stake in the company.

Date	Holder	% Stake	Shares Held	Total Value ($)	Shares	% Change in Portfolio
Mar 31, 2024	BLACKROCK INC.	6.45%	6.83M	4.74M	-255.73K	-3.61%
Mar 31, 2024	REDMILE GROUP, LLC	8.75%	9.26M	6.43M	156.86K	+1.72%
Mar 31, 2024	FMR LLC	0.39%	410.68K	285.01K	-54.04K	-11.63%
Mar 31, 2024	CHECKPOINT CAPITAL L.P.	0.84%	892.85K	619.64K	892.85K	+100.00%
Mar 31, 2024	J. GOLDMAN & CO LP	0.93%	986.65K	684.74K	986.65K	+100.00%
Mar 31, 2024	MORGAN STANLEY	1.27%	1.35M	934.21K	-447.24K	-24.94%
Mar 31, 2024	ACADIAN ASSET MANAGEMENT LLC	2.49%	2.64M	1.83M	873.13K	+49.45%
Mar 31, 2024	BOXER CAPITAL, LLC	3.92%	4.15M	2.88M	4.15M	+100.00%
Mar 31, 2024	PRICE T ROWE ASSOCIATES INC /MD/	4.68%	4.96M	3.44M	4.9M	+8,916.29%
Mar 31, 2024	VANGUARD GROUP INC	4.73%	5.01M	3.48M	-1.67M	-25.02%
Mar 31, 2024	ECOR1 CAPITAL, LLC	9.6%	10.17M	7.06M	100K	+0.99%
Mar 31, 2024	CITADEL ADVISORS LLC	0.05%	51.3K	35.6K	51.1K	+25,550.00%
Mar 31, 2024	JANE STREET GROUP, LLC	0.06%	62.65K	43.48K	-69.53K	-52.60%
Mar 31, 2024	BARCLAYS PLC	0.06%	67.66K	47K	-65.19K	-49.07%
Mar 31, 2024	MILLENNIUM MANAGEMENT LLC	0.34%	361.25K	250.7K	-2.56M	-87.63%
Mar 31, 2024	VONTOBEL HOLDING LTD.	0.08%	80K	55.52K	0	0
Mar 31, 2024	PRIVATE ADVISOR GROUP, LLC	0.09%	95.66K	66.39K	0	0
Mar 31, 2024	UBS GROUP AG	0.1%	106.47K	73.89K	-3.59M	-97.12%
Mar 31, 2024	HENNION & WALSH ASSET MANAGEMENT, INC.	0.11%	119.05K	82.62K	7.92K	+7.13%
Mar 31, 2024	GROUP ONE TRADING, L.P.	0.12%	128.52K	89.19K	-12.03K	-8.56%
Mar 31, 2024	SAVANT CAPITAL, LLC	0.12%	131.81K	91.48K	131.81K	+100.00%
Mar 31, 2024	SCHONFELD STRATEGIC ADVISORS LLC	0.14%	147K	102.02K	147K	+100.00%
Mar 31, 2024	RHUMBLINE ADVISERS	0.14%	147.57K	102.4K	2.16K	+1.49%
Mar 31, 2024	ALLIANCEBERNSTEIN L.P.	0.16%	167.2K	116.04K	0	0
Mar 31, 2024	GOLDMAN SACHS GROUP INC	0.23%	244.26K	169.51K	-337.93K	-58.05%
Mar 31, 2024	MANUFACTURERS LIFE INSURANCE COMPANY, THE	0.29%	312.16K	216.64K	286.99K	+1,140.02%
Mar 31, 2024	BANK OF NEW YORK MELLON CORP	0.33%	352.51K	244.64K	-42.25K	-10.70%
Mar 31, 2024	NEW YORK STATE COMMON RETIREMENT FUND	0.04%	39.68K	28K	140	+0.35%
Mar 31, 2024	INVESCO LTD.	0.03%	34.51K	23.95K	-36	-0.10%
Mar 31, 2024	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	0.03%	31.15K	90.32K	5.99K	+23.79%
Mar 31, 2024	SG AMERICAS SECURITIES, LLC	0.03%	29.73K	21K	-20.19K	-40.44%
Mar 31, 2024	PRINCIPAL FINANCIAL GROUP INC	0.03%	26.59K	18.45K	-6.72K	-20.16%
Mar 31, 2024	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0.02%	20.16K	13.99K	20.16K	+100.00%
Mar 31, 2024	CWM, LLC	0.02%	19.95K	14K	6.18K	+44.94%
Mar 31, 2024	RAYMOND JAMES & ASSOCIATES	0.02%	19.89K	13.8K	300	+1.53%
Mar 31, 2024	CITIGROUP INC	0.02%	18.69K	12.97K	4.68K	+33.38%
Mar 31, 2024	LETKO, BROSSEAU & ASSOCIATES INC	0.02%	17.5K	12.15K	0	0
Mar 31, 2024	PROSHARE ADVISORS LLC	0.02%	17.4K	12.08K	1.37K	+8.55%
Mar 31, 2024	COMMONWEALTH EQUITY SERVICES, LLC	0.02%	16.96K	12K	16.96K	+100.00%
Mar 31, 2024	ADVISOR GROUP HOLDINGS, INC.	0.02%	16.73K	11.55K	14.5K	+649.06%
Mar 31, 2024	VANGUARD PERSONALIZED INDEXING MANAGEMENT, LLC	0.01%	13.4K	9.3K	13.4K	+100.00%
Mar 31, 2024	WEALTH ARCHITECTS, LLC	0.01%	13.28K	9.21K	0	0
Mar 31, 2024	PINNACLE ASSOCIATES LTD	0.01%	12.74K	8.84K	-1.05K	-7.61%
Mar 31, 2024	NEUBERGER BERMAN GROUP LLC	0.01%	11.98K	8.31K	839	+7.53%
Mar 31, 2024	LAKE STREET ADVISORS GROUP, LLC	0.01%	11K	7.63K	0	0
Mar 31, 2024	LEGAL & GENERAL GROUP PLC	0.01%	9.05K	6.28M	0	0
Mar 31, 2024	AMERITAS INVESTMENT PARTNERS, INC.	0.01%	6.78K	4.71M	0	0
Mar 31, 2024	AMALGAMATED BANK	0%	3.22K	2K	-6.12K	-65.53%
Mar 31, 2024	FARTHER FINANCE ADVISORS, LLC	0%	220	160	219	+21,900.00%
Mar 31, 2024	NISA INVESTMENT ADVISORS, LLC	0%	50	35	-30	-37.50%
Mar 31, 2024	WELLS FARGO & COMPANY/MN	0.04%	39.99K	27.75K	4.62K	+13.07%
Mar 31, 2024	DELAP WEALTH ADVISORY, LLC	0.04%	41.53K	28.82K	41.53K	+100.00%
Mar 31, 2024	MARSHALL WACE, LLP	0.04%	42.24K	29.15K	-250.26K	-85.56%
Mar 31, 2024	STATE OF WISCONSIN INVESTMENT BOARD	0.04%	45.3K	31.44K	100	+0.22%
Mar 31, 2024	AMERICAN INTERNATIONAL GROUP, INC.	0.05%	47.73K	33.13K	-410	-0.85%
Mar 31, 2024	ROYAL BANK OF CANADA	0.27%	287.64K	200K	257.14K	+843.23%
Mar 31, 2024	BNP PARIBAS ARBITRAGE, SNC	0.36%	383.08K	265.86K	86.84K	+29.31%
Mar 31, 2024	TD ASSET MANAGEMENT INC	0.41%	436.8K	303.14K	436.8K	+100.00%
Mar 31, 2024	SHAY CAPITAL LLC	0.41%	438.51K	304.32K	438.51K	+100.00%
Mar 31, 2024	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0.72%	761.36K	528.38K	16.22K	+2.18%
Mar 31, 2024	NORTHERN TRUST CORP	0.8%	850.82K	590.47K	5.39K	+0.64%
Mar 31, 2024	RENAISSANCE TECHNOLOGIES LLC	0.93%	980.39K	680K	357.47K	+57.39%
Mar 31, 2024	STALEY CAPITAL ADVISERS INC	0.94%	1M	694K	0	0
Mar 31, 2024	JPMORGAN CHASE & CO	1.28%	1.35M	937.74K	-836.83K	-38.25%
Mar 31, 2024	WOODLINE PARTNERS LP	1.68%	1.77M	1.23M	1.77M	+100.00%
Mar 31, 2024	TANG CAPITAL MANAGEMENT LLC	1.78%	1.88M	1.3M	1.88M	+100.00%
Mar 31, 2024	GEODE CAPITAL MANAGEMENT, LLC	2.04%	2.16M	1.5M	8.44K	+0.39%
Mar 31, 2024	STATE STREET CORP	2.35%	2.49M	1.73M	-295.15K	-10.60%
Mar 31, 2024	AQR CAPITAL MANAGEMENT LLC	2.48%	2.63M	1.82M	-306.84K	-10.46%
Mar 31, 2024	VESTAL POINT CAPITAL, LP	2.64%	2.8M	1.94M	2.8M	+100.00%
Mar 31, 2024	BANK OF AMERICA CORP /DE/	6.21%	6.58M	4.57M	6.39M	+3,379.43%
Dec 31, 2023	PRIVATE ADVISOR GROUP, LLC	0.09%	95.66K	49.05K	198	+0.21%
Dec 31, 2023	ECOR1 CAPITAL, LLC	9.46%	10.07M	5.16M	10.07M	+100.00%
Dec 31, 2023	REDMILE GROUP, LLC	8.56%	9.11M	4.67M	2.83M	+44.99%
Dec 31, 2023	BLACKROCK INC.	6.66%	7.09M	3.63M	-608.72K	-7.91%
Dec 31, 2023	VANGUARD GROUP INC	6.28%	6.69M	3.43M	80.11K	+1.21%
Dec 31, 2023	UBS GROUP AG	3.47%	3.69M	1.89M	3.63M	+6,214.07%
Dec 31, 2023	AQR CAPITAL MANAGEMENT LLC	2.76%	2.93M	1.5M	2.09M	+247.24%
Dec 31, 2023	MILLENNIUM MANAGEMENT LLC	2.75%	2.92M	1.5M	2.59M	+793.09%
Dec 31, 2023	STATE STREET CORP	2.62%	2.78M	1.43M	261.51K	+10.37%
Dec 31, 2023	JPMORGAN CHASE & CO	2.06%	2.19M	1.12M	-6.48M	-74.76%
Dec 31, 2023	GEODE CAPITAL MANAGEMENT, LLC	2.02%	2.15M	1.1M	73.58K	+3.54%
Dec 31, 2023	MORGAN STANLEY	1.69%	1.79M	919.64K	-421.31K	-19.02%
Dec 31, 2023	ACADIAN ASSET MANAGEMENT LLC	1.66%	1.77M	904K	1.23M	+230.38%
Dec 31, 2023	D. E. SHAW & CO., INC.	0.97%	1.03M	530.23K	-2.88M	-73.56%
Dec 31, 2023	STALEY CAPITAL ADVISERS INC	0.94%	1M	512.8K	0	0
Dec 31, 2023	NORTHERN TRUST CORP	0.79%	845.43K	433.54K	46.51K	+5.82%
Dec 31, 2023	GSA CAPITAL PARTNERS LLP	0.74%	784.37K	402K	784.37K	+100.00%
Dec 31, 2023	JACOBS LEVY EQUITY MANAGEMENT, INC	0.73%	780.99K	400.49K	214.09K	+37.77%
Dec 31, 2023	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0.7%	745.15K	382.11K	-48.41K	-6.10%
Dec 31, 2023	RENAISSANCE TECHNOLOGIES LLC	0.59%	622.91K	319K	-206.2K	-24.87%
Dec 31, 2023	GOLDMAN SACHS GROUP INC	0.55%	582.19K	298.55K	-3.54M	-85.88%
Dec 31, 2023	PACIFIC HEIGHTS ASSET MANAGEMENT LLC	0.49%	525K	269.22K	0	0
Dec 31, 2023	FMR LLC	0.44%	464.72K	238.31K	229.18K	+97.30%
Dec 31, 2023	BANK OF NEW YORK MELLON CORP	0.37%	394.76K	202.43K	59.4K	+17.71%
Dec 31, 2023	BNP PARIBAS ARBITRAGE, SNC	0.28%	296.24K	151.91K	276.53K	+1,402.76%
Dec 31, 2023	MARSHALL WACE, LLP	0.27%	292.5K	149.18K	292.5K	+100.00%
Dec 31, 2023	CITADEL ADVISORS LLC	0.25%	263.05K	134.89K	-1.41M	-84.26%
Dec 31, 2023	HARBOR CAPITAL ADVISORS, INC.	0.2%	208.83K	107.09K	164.21K	+368.00%
Dec 31, 2023	BANK OF AMERICA CORP /DE/	0.18%	189.13K	96.83K	91.03K	+92.79%
Dec 31, 2023	ALLIANCEBERNSTEIN L.P.	0.16%	167.2K	85.74K	-9.5K	-5.38%
Dec 31, 2023	RHUMBLINE ADVISERS	0.14%	145.41K	74.58K	-60	-0.04%
Dec 31, 2023	GROUP ONE TRADING, L.P.	0.13%	140.56K	72.08M	76.47K	+119.31%
Dec 31, 2023	BARCLAYS PLC	0.12%	132.85K	69K	116.11K	+693.92%
Dec 31, 2023	JANE STREET GROUP, LLC	0.12%	132.18K	67.78K	108.77K	+464.76%
Dec 31, 2023	TWO SIGMA INVESTMENTS, LP	0.12%	129.18K	66.25K	129.18K	+100.00%
Dec 31, 2023	HRT FINANCIAL LP	0.11%	117.27K	60K	117.27K	+100.00%
Dec 31, 2023	HENNION & WALSH ASSET MANAGEMENT, INC.	0.1%	111.13K	56.99K	-57.79K	-34.21%
Dec 31, 2023	CAPTRUST FINANCIAL ADVISORS	0.08%	83.07K	42.6K	65.06K	+361.14%
Dec 31, 2023	VONTOBEL HOLDING LTD.	0.08%	80K	41.02K	80K	+100.00%
Dec 31, 2023	TWO SIGMA SECURITIES, LLC	0.06%	68.24K	35K	68.24K	+100.00%
Dec 31, 2023	PRICE T ROWE ASSOCIATES INC /MD/	0.05%	54.99K	29K	0	0
Dec 31, 2023	SG AMERICAS SECURITIES, LLC	0.05%	49.92K	26K	11.18K	+28.86%
Dec 31, 2023	AMERICAN INTERNATIONAL GROUP, INC.	0.05%	48.14K	24.69K	-194	-0.40%
Dec 31, 2023	STATE OF WISCONSIN INVESTMENT BOARD	0.04%	45.2K	23.18K	0	0
Dec 31, 2023	VOYA INVESTMENT MANAGEMENT LLC	0.04%	40.84K	20.94K	-78.42K	-65.75%
Dec 31, 2023	NEW YORK STATE COMMON RETIREMENT FUND	0.04%	39.54K	20K	-143	-0.36%
Dec 31, 2023	DEUTSCHE BANK AG\	0.04%	38.38K	19.58K	-350K	-90.12%
Dec 31, 2023	CUBIST SYSTEMATIC STRATEGIES, LLC	0.03%	36.46K	18.7K	-7.98K	-17.97%
Dec 31, 2023	XTX TOPCO LTD	0.03%	35.56K	18.24K	1.32K	+3.86%
Dec 31, 2023	POINT72 MIDDLE EAST FZE	0.03%	35.54K	18.22K	35.54K	+100.00%
Sep 30, 2023	BAUPOST GROUP LLC/MA	9.3%	9.77M	-	0	0
Sep 30, 2023	ALLSPRING GLOBAL INVESTMENTS HOLDINGS, LLC	0.04%	38.97K	-	-27.44K	-41.32%
Sep 30, 2023	NEW YORK STATE COMMON RETIREMENT FUND	0.04%	39.68K	-	314	+0.80%
Sep 30, 2023	MANUFACTURERS LIFE INSURANCE COMPANY, THE	0.04%	43.09K	-	0	0
Sep 30, 2023	ENVESTNET ASSET MANAGEMENT INC	0.04%	43.75K	-	14.16K	+47.88%
Sep 30, 2023	CUBIST SYSTEMATIC STRATEGIES, LLC	0.04%	44.44K	-	-232.13K	-83.93%
Sep 30, 2023	HARBOR CAPITAL ADVISORS, INC.	0.04%	44.62K	-	-5.46K	-10.89%
Sep 30, 2023	STATE OF WISCONSIN INVESTMENT BOARD	0.04%	45.2K	-	0	0
Sep 30, 2023	AMERICAN INTERNATIONAL GROUP, INC.	0.05%	48.34K	-	2.36K	+5.13%
Sep 30, 2023	B. METZLER SEEL. SOHN & CO. AG	0.05%	49.28K	-	-49.28K	-50.00%
Sep 30, 2023	METLIFE INVESTMENT MANAGEMENT, LLC	0.05%	49.73K	-	0	0
Sep 30, 2023	UBS GROUP AG	0.06%	58.49K	-	7.12K	+13.85%
Sep 30, 2023	ROYAL BANK OF CANADA	0.06%	60.05K	-	8.35K	+16.16%
Sep 30, 2023	GRAHAM CAPITAL MANAGEMENT, L.P.	0.06%	62.02K	-	-23.66K	-27.61%
Sep 30, 2023	GROUP ONE TRADING, L.P.	0.06%	64.09K	-	64.09K	+100.00%
Sep 30, 2023	SIMPLEX TRADING, LLC	0.09%	94.97K	-	49.71K	+109.82%
Sep 30, 2023	PRIVATE ADVISOR GROUP, LLC	0.09%	95.46K	-	33.06K	+52.99%
Sep 30, 2023	CORNERCAP INVESTMENT COUNSEL INC	0.11%	114.7K	-	-1.46K	-1.26%
Sep 30, 2023	VOYA INVESTMENT MANAGEMENT LLC	0.11%	119.26K	-	17.55K	+17.25%
Sep 30, 2023	NUVEEN ASSET MANAGEMENT, LLC	0.13%	132.87K	-	69.15K	+108.51%
Sep 30, 2023	RHUMBLINE ADVISERS	0.14%	145.47K	-	2.7K	+1.89%
Sep 30, 2023	HENNION & WALSH ASSET MANAGEMENT, INC.	0.16%	168.92K	-	-10.22K	-5.71%
Sep 30, 2023	ALLIANCEBERNSTEIN L.P.	0.17%	176.7K	-	0	0
Sep 30, 2023	RAYMOND JAMES & ASSOCIATES	0.18%	189.64K	-	2.3K	+1.23%
Sep 30, 2023	JOSH ARNOLD INVESTMENT CONSULTANT, LLC	0.19%	200K	-	30K	+17.65%
Sep 30, 2023	DIMENSIONAL FUND ADVISORS LP	0.21%	219.46K	-	-436.31K	-66.53%
Sep 30, 2023	FMR LLC	0.22%	235.54K	-	11.83K	+5.29%
Sep 30, 2023	BANK OF NEW YORK MELLON CORP	0.32%	335.36K	-	-4.08K	-1.20%
Sep 30, 2023	PINNACLE ASSOCIATES LTD	0.37%	385.36K	-	-10.23K	-2.59%
Sep 30, 2023	DEUTSCHE BANK AG\	0.37%	388.38K	-	-299.81K	-43.56%
Sep 30, 2023	CITIGROUP INC	0.43%	453.1K	-	-28.64K	-5.95%
Sep 30, 2023	EXODUSPOINT CAPITAL MANAGEMENT, LP	0.46%	486.67K	-	68.79K	+16.46%
Sep 30, 2023	PACIFIC HEIGHTS ASSET MANAGEMENT LLC	0.5%	525K	-	0	0
Sep 30, 2023	ACADIAN ASSET MANAGEMENT LLC	0.51%	534.39K	-	-170.3K	-24.17%
Sep 30, 2023	POINT72 ASSET MANAGEMENT, L.P.	0.53%	555K	-	-17.23K	-3.01%
Sep 30, 2023	JACOBS LEVY EQUITY MANAGEMENT, INC	0.54%	566.9K	-	549.97K	+3,249.06%
Sep 30, 2023	DRIEHAUS CAPITAL MANAGEMENT LLC	0.56%	589.95K	-	589.95K	+100.00%
Sep 30, 2023	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0.76%	793.56K	-	93.52K	+13.36%
Sep 30, 2023	NORTHERN TRUST CORP	0.76%	798.92K	-	3.68K	+0.46%
Sep 30, 2023	ANTIPODEAN ADVISORS LLC	0.95%	1M	-	0	0
Sep 30, 2023	STALEY CAPITAL ADVISERS INC	0.95%	1M	-	250K	+33.33%
Sep 30, 2023	AMERIPRISE FINANCIAL INC	1.57%	1.65M	-	502.9K	+43.78%
Sep 30, 2023	GEODE CAPITAL MANAGEMENT, LLC	1.98%	2.08M	-	45.02K	+2.22%
Sep 30, 2023	MORGAN STANLEY	2.11%	2.21M	-	-288.09K	-11.51%
Sep 30, 2023	D. E. SHAW & CO., INC.	3.72%	3.91M	-	-438.91K	-10.09%
Sep 30, 2023	GOLDMAN SACHS GROUP INC	3.92%	4.12M	-	-437.6K	-9.59%
Sep 30, 2023	MAVERICK CAPITAL LTD	5.99%	6.29M	-	0	0
Sep 30, 2023	BLACKROCK INC.	7.32%	7.7M	-	-567.31K	-6.87%
Sep 30, 2023	WASATCH ADVISORS LP	7.99%	8.4M	-	115.25K	+1.39%

ATRA Insiders

Among the ATRA insiders holding of 21.98% of the stake in company, DOBMEIER ERIC, director, holds the largest shares of 563.33K. GALLAGHER CAROL GILTNER, director, is the second largest ATRA insider with ownership of 459.42K shares. DUPONT JAKOB, EVP, Head of R&D, stands third with possession of 290.79K shares of that stake.

Insiders	Designation	Shares Held
DOBMEIER ERIC	director	563.33K
GALLAGHER CAROL GILTNER	director	459.42K
DUPONT JAKOB	EVP, Head of R&D	290.79K
BANARD CHARLENE A.	EVP, Chief Technical Officer	276.01K
HEIDEN WILLIAM K	director	209K
KOPPIKAR UTPAL	Chief Financial Officer	181.98K
JOSHI MANHER	EVP, Chief Medical Officer	171.28K
NEWELL JOE	Chief Operations Officer	113.1K
YAREMA KRISTIN	Chief Commercial Officer	97.05K
NGUYEN ANHCO	President and CEO	74.12K
TOUCHON PASCAL	President and CEO	70.13K
HYLLENGREN ERIC J	EVP, CFO and COO	56.23K
FUST MATTHEW K	director	31.5K
MURUGAN AMAR	EVP, Chief Legal Officer	26.83K
HENRICH JILL	EVP, Chief Regulatory Officer	18.68K

Buying/Selling by Insiders

Date	Insider	Type	Cost	Shares	Value ($)	Shares Total
Mar 03, 2025	HYLLENGREN ERIC J	SALE	7.00	1.21K	8.47K	56.23K
Mar 03, 2025	NGUYEN ANHCO	SALE	7.00	3.33K	23.31K	74.12K
Mar 03, 2025	HENRICH JILL	SALE	7.00	1.06K	7.41K	18.68K
Nov 18, 2024	HYLLENGREN ERIC J	SALE	11.20	1.36K	15.27K	23.39K
Nov 18, 2024	NGUYEN ANHCO	SALE	11.20	1.66K	18.63K	77.45K
Nov 18, 2024	HENRICH JILL	SALE	11.20	1K	11.2K	19.38K
Aug 16, 2024	MURUGAN AMAR	SALE	6.63	89	590.16	26.83K
Aug 16, 2024	HENRICH JILL	SALE	6.63	132	875.29	20.38K
Aug 16, 2024	TOUCHON PASCAL	SALE	6.63	276	1.83K	70.13K
Aug 16, 2024	NGUYEN ANHCO	SALE	6.63	56	371.34	34.12K
Aug 16, 2024	HYLLENGREN ERIC J	SALE	6.63	29	192.3	24.76K
May 16, 2024	MURUGAN AMAR	SALE	0.62	32.4K	19.99K	695.12K
May 16, 2024	HYLLENGREN ERIC J	SALE	0.62	28.65K	17.68K	645.67K
May 16, 2024	NGUYEN ANHCO	SALE	0.62	42.9K	26.47K	898.5K
May 16, 2024	TOUCHON PASCAL	SALE	0.62	81.51K	50.29K	1.83M
May 16, 2024	HENRICH JILL	SALE	0.62	25.75K	15.89K	529.25K
Mar 04, 2024	NGUYEN ANHCO	SALE	0.72	10.75K	7.74K	941.4K
Mar 04, 2024	MURUGAN AMAR	SALE	0.72	10.04K	7.23K	727.52K
Mar 04, 2024	HENRICH JILL	SALE	0.72	3.88K	2.79K	555K
Mar 04, 2024	HYLLENGREN ERIC J	SALE	0.72	5.22K	3.76K	674.32K
Mar 04, 2024	TOUCHON PASCAL	SALE	0.72	24.84K	17.89K	1.91M
Nov 16, 2023	MURUGAN AMAR	SALE	0.39	8.31K	3.23K	257.08K
Nov 16, 2023	JOSHI MANHER	SALE	0.39	12.29K	4.78K	171.28K
Nov 16, 2023	HENRICH JILL	SALE	0.39	3.27K	1.27K	104.42K
Nov 16, 2023	HYLLENGREN ERIC J	SALE	0.39	11.96K	4.65K	206K
Nov 16, 2023	TOUCHON PASCAL	SALE	0.39	20.41K	7.94K	655.5K
Nov 16, 2023	NGUYEN ANHCO	SALE	0.39	8.86K	3.44K	277.14K
Nov 14, 2023	GALLAGHER CAROL GILTNER	PURCHASE	0.31	90.98K	28.19K	459.42K
Nov 13, 2023	GALLAGHER CAROL GILTNER	PURCHASE	0.22	179.02K	40.03K	368.44K
Nov 10, 2023	HEIDEN WILLIAM K	PURCHASE	0.25	100K	25.33K	209K
Nov 10, 2023	DOBMEIER ERIC	PURCHASE	0.23	446.83K	101.34K	563.33K
Aug 16, 2023	NGUYEN ANHCO	SALE	1.65	9.28K	15.33K	286K
Aug 16, 2023	HENRICH JILL	SALE	1.65	558	922.93	107.69K
Aug 16, 2023	JOSHI MANHER	SALE	1.65	3.77K	6.24K	183.57K
Aug 16, 2023	HYLLENGREN ERIC J	SALE	1.65	1.78K	2.94K	217.96K
Aug 16, 2023	TOUCHON PASCAL	SALE	1.65	9.33K	15.43K	675.91K
Aug 16, 2023	MURUGAN AMAR	SALE	1.65	3.62K	5.99K	265.39K
Jun 27, 2023	TOUCHON PASCAL	SALE	1.66	14.29K	23.72K	706.67K
May 16, 2023	TOUCHON PASCAL	SALE	2.04	29.77K	60.63K	720.96K
May 16, 2023	BANARD CHARLENE A.	SALE	2.04	19.04K	38.78K	276.01K
May 16, 2023	MURUGAN AMAR	SALE	2.04	985	2.01K	270.95K
May 16, 2023	HYLLENGREN ERIC J	SALE	2.04	1.72K	3.5K	226.14K
Mar 02, 2023	KOPPIKAR UTPAL	SALE	3.63	6.87K	24.92K	181.98K
Mar 02, 2023	MURUGAN AMAR	SALE	3.63	4.22K	15.31K	279.33K
Mar 02, 2023	TOUCHON PASCAL	SALE	3.63	15.68K	56.87K	750.73K
Mar 02, 2023	DUPONT JAKOB	SALE	3.63	5.07K	18.4K	290.79K
Feb 07, 2023	KOPPIKAR UTPAL	SALE	5.46	2.49K	13.57K	188.85K
Nov 16, 2022	DUPONT JAKOB	SALE	4.49	1.12K	5.05K	154.54K
Nov 16, 2022	TOUCHON PASCAL	SALE	4.49	15.59K	70K	441.7K
Nov 16, 2022	MURUGAN AMAR	SALE	4.49	3.61K	16.22K	127.59K
Nov 16, 2022	KOPPIKAR UTPAL	SALE	4.49	1.08K	4.86K	191.33K
Aug 16, 2022	KOPPIKAR UTPAL	SALE	5.04	5.94K	29.91K	197.59K
Aug 16, 2022	DUPONT JAKOB	SALE	5.03	4.12K	20.76K	158.88K
Aug 16, 2022	TOUCHON PASCAL	SALE	5.04	14.81K	74.55K	457.29K
Aug 16, 2022	MURUGAN AMAR	SALE	5.04	2.23K	11.25K	131.2K
Jun 27, 2022	TOUCHON PASCAL	SALE	7.20	14.22K	102.38K	472.09K
Jun 08, 2022	KOPPIKAR UTPAL	SALE	5.63	5.85K	32.95K	203.53K
May 17, 2022	TOUCHON PASCAL	SALE	5.32	13.91K	73.96K	486.31K
May 17, 2022	KOPPIKAR UTPAL	SALE	5.32	966	5.14K	207.59K
May 17, 2022	MURUGAN AMAR	SALE	5.32	906	4.82K	133.74K
May 17, 2022	DUPONT JAKOB	SALE	5.32	3.87K	20.6K	163.01K
Mar 01, 2022	MURUGAN AMAR	SALE	9.86	1.11K	10.96K	136.96K
Mar 01, 2022	KOPPIKAR UTPAL	SALE	9.86	1.49K	14.7K	213.17K
Mar 01, 2022	DUPONT JAKOB	SALE	9.86	2.22K	21.89K	166.88K
Mar 01, 2022	TOUCHON PASCAL	SALE	9.86	8.83K	87.01K	500.23K
Feb 10, 2022	DUPONT JAKOB	SALE	16.00	5K	80K	90.59K
Feb 07, 2022	KOPPIKAR UTPAL	SALE	14.46	2.5K	36.1K	155.7K
Jan 03, 2022	DUPONT JAKOB	SALE	16.01	5K	80.05K	90.59K
Dec 01, 2021	DUPONT JAKOB	SALE	17.94	5K	89.69K	90.59K
Nov 16, 2021	MURUGAN AMAR	SALE	17.12	2.12K	36.36K	87.54K
Nov 16, 2021	DUPONT JAKOB	SALE	17.12	2.2K	37.64K	90.59K
Nov 16, 2021	NEWELL JOE	SALE	17.12	3.33K	57.03K	113.1K
Nov 16, 2021	TOUCHON PASCAL	SALE	17.12	8.4K	143.82K	328.49K
Nov 16, 2021	KOPPIKAR UTPAL	SALE	17.12	3.66K	62.56K	157.71K
Nov 15, 2021	NEWELL JOE	SALE	17.71	7K	124K	116.43K
Nov 04, 2021	FUST MATTHEW K	SALE	19.50	13.35K	260.4K	31.5K
Nov 02, 2021	DUPONT JAKOB	SALE	16.41	5K	82.05K	92.79K
Sep 22, 2021	NEWELL JOE	SALE	17.00	10.5K	178.5K	119.93K
Sep 15, 2021	NEWELL JOE	SALE	15.61	3.12K	48.65K	119.93K
Aug 30, 2021	NEWELL JOE	SALE	15.00	3.5K	52.5K	123.05K
Aug 17, 2021	TOUCHON PASCAL	SALE	12.53	8.22K	103.05K	336.89K
Aug 17, 2021	MURUGAN AMAR	SALE	12.53	2.08K	26.07K	89.66K
Aug 17, 2021	NEWELL JOE	SALE	12.53	2.43K	30.4K	126.55K
Aug 17, 2021	KOPPIKAR UTPAL	SALE	12.53	3.58K	44.85K	161.37K
Aug 17, 2021	DUPONT JAKOB	SALE	12.53	2.15K	26.97K	92.79K
Jun 25, 2021	TOUCHON PASCAL	SALE	16.32	14.19K	231.66K	345.11K
Jun 14, 2021	YAREMA KRISTIN	PURCHASE	14.48	3.5K	50.68K	97.05K
Jun 11, 2021	YAREMA KRISTIN	PURCHASE	14.50	2.02K	29.3K	93.55K
Jun 08, 2021	KOPPIKAR UTPAL	SALE	14.06	5.82K	81.83K	164.95K
May 18, 2021	DUPONT JAKOB	SALE	14.55	5.18K	75.43K	94.95K
May 18, 2021	NEWELL JOE	SALE	14.55	2.45K	35.69K	128.97K
May 18, 2021	TOUCHON PASCAL	SALE	14.55	8.31K	120.95K	359.31K
May 18, 2021	KOPPIKAR UTPAL	SALE	14.55	3.62K	52.61K	168.97K
May 18, 2021	YAREMA KRISTIN	SALE	14.55	761	11.07K	91.53K
May 18, 2021	MURUGAN AMAR	SALE	14.55	5.68K	82.66K	91.74K
May 17, 2021	NEWELL JOE	SALE	15.00	3.5K	52.5K	131.42K
Apr 05, 2021	NEWELL JOE	SALE	14.74	655	9.65K	134.92K
Mar 26, 2021	NEWELL JOE	SALE	14.58	2.64K	38.49K	135.58K
Mar 26, 2021	KOPPIKAR UTPAL	SALE	14.58	1.76K	25.68K	172.58K
Mar 15, 2021	NEWELL JOE	SALE	17.41	7K	121.87K	138.22K
Mar 02, 2021	KOPPIKAR UTPAL	SALE	16.74	1.46K	24.46K	174.34K
Mar 02, 2021	NEWELL JOE	SALE	16.74	1.67K	27.87K	141.72K
Mar 02, 2021	TOUCHON PASCAL	SALE	16.74	4.89K	81.81K	367.62K
Feb 08, 2021	KOPPIKAR UTPAL	SALE	20.39	1.76K	35.87K	130.55K
Feb 08, 2021	NEWELL JOE	SALE	20.39	3.89K	79.24K	105.67K
Jan 15, 2021	NEWELL JOE	SALE	18.84	7K	131.88K	109.56K
Dec 16, 2020	NEWELL JOE	SALE	23.13	3.5K	80.96K	116.56K
Nov 17, 2020	KOPPIKAR UTPAL	SALE	19.77	1.47K	29.05K	132.06K
Nov 17, 2020	NEWELL JOE	SALE	19.77	1.65K	32.59K	116.56K

Insider Transaction Summary (6 Months)

SHARESTRANS

PURCHASE00

SALES9.63K6

NET SHARES-9.63K6

NO. OF SHARES HELD269.26K6

% NET SHARES-103.58%0%

Frequently Asked Questions

ATRA Stock Outstanding Shares

ShortableYes

OptionableNo

Short Percent Of Outstanding Shares11.21

Short Percent Of Float11.36

Shares Outstanding5.76M

Shares Float4.07M

Shares Short636.28K

Short Ratio7.11

11.36%

Short % of Float

11.21%

Short % of Shares Outstanding

Market Insider ATRA

Investors cannot turn a blind eye to insiders as well as institutional ownership. They need to follow insider trades to determine the direction the stock is likely to take.

Major Holders Summary

21.98% Percentage of Shares held by All Insiders

50.5% Percentage of Shares held by All Institutions

64.73% Percentage of Float held by Institutions

Number of Institutions Holding Shares

Institutional Ownership

Date	Holder	% Stake	Shares Held	Total Value ($)	Shares	% Change in Portfolio
Mar 31, 2024	BLACKROCK INC.	6.45%	6.83M	4.74M	-255.73K	-3.61%
Mar 31, 2024	REDMILE GROUP, LLC	8.75%	9.26M	6.43M	156.86K	+1.72%
Mar 31, 2024	FMR LLC	0.39%	410.68K	285.01K	-54.04K	-11.63%
Mar 31, 2024	CHECKPOINT CAPITAL L.P.	0.84%	892.85K	619.64K	892.85K	+100.00%
Mar 31, 2024	J. GOLDMAN & CO LP	0.93%	986.65K	684.74K	986.65K	+100.00%
Mar 31, 2024	MORGAN STANLEY	1.27%	1.35M	934.21K	-447.24K	-24.94%
Mar 31, 2024	ACADIAN ASSET MANAGEMENT LLC	2.49%	2.64M	1.83M	873.13K	+49.45%
Mar 31, 2024	BOXER CAPITAL, LLC	3.92%	4.15M	2.88M	4.15M	+100.00%
Mar 31, 2024	PRICE T ROWE ASSOCIATES INC /MD/	4.68%	4.96M	3.44M	4.9M	+8,916.29%
Mar 31, 2024	VANGUARD GROUP INC	4.73%	5.01M	3.48M	-1.67M	-25.02%
Mar 31, 2024	ECOR1 CAPITAL, LLC	9.6%	10.17M	7.06M	100K	+0.99%
Mar 31, 2024	CITADEL ADVISORS LLC	0.05%	51.3K	35.6K	51.1K	+25,550.00%
Mar 31, 2024	JANE STREET GROUP, LLC	0.06%	62.65K	43.48K	-69.53K	-52.60%
Mar 31, 2024	BARCLAYS PLC	0.06%	67.66K	47K	-65.19K	-49.07%
Mar 31, 2024	MILLENNIUM MANAGEMENT LLC	0.34%	361.25K	250.7K	-2.56M	-87.63%
Mar 31, 2024	VONTOBEL HOLDING LTD.	0.08%	80K	55.52K	0	0
Mar 31, 2024	PRIVATE ADVISOR GROUP, LLC	0.09%	95.66K	66.39K	0	0
Mar 31, 2024	UBS GROUP AG	0.1%	106.47K	73.89K	-3.59M	-97.12%
Mar 31, 2024	HENNION & WALSH ASSET MANAGEMENT, INC.	0.11%	119.05K	82.62K	7.92K	+7.13%
Mar 31, 2024	GROUP ONE TRADING, L.P.	0.12%	128.52K	89.19K	-12.03K	-8.56%
Mar 31, 2024	SAVANT CAPITAL, LLC	0.12%	131.81K	91.48K	131.81K	+100.00%
Mar 31, 2024	SCHONFELD STRATEGIC ADVISORS LLC	0.14%	147K	102.02K	147K	+100.00%
Mar 31, 2024	RHUMBLINE ADVISERS	0.14%	147.57K	102.4K	2.16K	+1.49%
Mar 31, 2024	ALLIANCEBERNSTEIN L.P.	0.16%	167.2K	116.04K	0	0
Mar 31, 2024	GOLDMAN SACHS GROUP INC	0.23%	244.26K	169.51K	-337.93K	-58.05%
Mar 31, 2024	MANUFACTURERS LIFE INSURANCE COMPANY, THE	0.29%	312.16K	216.64K	286.99K	+1,140.02%
Mar 31, 2024	BANK OF NEW YORK MELLON CORP	0.33%	352.51K	244.64K	-42.25K	-10.70%
Mar 31, 2024	NEW YORK STATE COMMON RETIREMENT FUND	0.04%	39.68K	28K	140	+0.35%
Mar 31, 2024	INVESCO LTD.	0.03%	34.51K	23.95K	-36	-0.10%
Mar 31, 2024	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	0.03%	31.15K	90.32K	5.99K	+23.79%
Mar 31, 2024	SG AMERICAS SECURITIES, LLC	0.03%	29.73K	21K	-20.19K	-40.44%
Mar 31, 2024	PRINCIPAL FINANCIAL GROUP INC	0.03%	26.59K	18.45K	-6.72K	-20.16%
Mar 31, 2024	SUSQUEHANNA INTERNATIONAL GROUP, LLP	0.02%	20.16K	13.99K	20.16K	+100.00%
Mar 31, 2024	CWM, LLC	0.02%	19.95K	14K	6.18K	+44.94%
Mar 31, 2024	RAYMOND JAMES & ASSOCIATES	0.02%	19.89K	13.8K	300	+1.53%
Mar 31, 2024	CITIGROUP INC	0.02%	18.69K	12.97K	4.68K	+33.38%
Mar 31, 2024	LETKO, BROSSEAU & ASSOCIATES INC	0.02%	17.5K	12.15K	0	0
Mar 31, 2024	PROSHARE ADVISORS LLC	0.02%	17.4K	12.08K	1.37K	+8.55%
Mar 31, 2024	COMMONWEALTH EQUITY SERVICES, LLC	0.02%	16.96K	12K	16.96K	+100.00%
Mar 31, 2024	ADVISOR GROUP HOLDINGS, INC.	0.02%	16.73K	11.55K	14.5K	+649.06%
Mar 31, 2024	VANGUARD PERSONALIZED INDEXING MANAGEMENT, LLC	0.01%	13.4K	9.3K	13.4K	+100.00%
Mar 31, 2024	WEALTH ARCHITECTS, LLC	0.01%	13.28K	9.21K	0	0
Mar 31, 2024	PINNACLE ASSOCIATES LTD	0.01%	12.74K	8.84K	-1.05K	-7.61%
Mar 31, 2024	NEUBERGER BERMAN GROUP LLC	0.01%	11.98K	8.31K	839	+7.53%
Mar 31, 2024	LAKE STREET ADVISORS GROUP, LLC	0.01%	11K	7.63K	0	0
Mar 31, 2024	LEGAL & GENERAL GROUP PLC	0.01%	9.05K	6.28M	0	0
Mar 31, 2024	AMERITAS INVESTMENT PARTNERS, INC.	0.01%	6.78K	4.71M	0	0
Mar 31, 2024	AMALGAMATED BANK	0%	3.22K	2K	-6.12K	-65.53%
Mar 31, 2024	FARTHER FINANCE ADVISORS, LLC	0%	220	160	219	+21,900.00%
Mar 31, 2024	NISA INVESTMENT ADVISORS, LLC	0%	50	35	-30	-37.50%
Mar 31, 2024	WELLS FARGO & COMPANY/MN	0.04%	39.99K	27.75K	4.62K	+13.07%
Mar 31, 2024	DELAP WEALTH ADVISORY, LLC	0.04%	41.53K	28.82K	41.53K	+100.00%
Mar 31, 2024	MARSHALL WACE, LLP	0.04%	42.24K	29.15K	-250.26K	-85.56%
Mar 31, 2024	STATE OF WISCONSIN INVESTMENT BOARD	0.04%	45.3K	31.44K	100	+0.22%
Mar 31, 2024	AMERICAN INTERNATIONAL GROUP, INC.	0.05%	47.73K	33.13K	-410	-0.85%
Mar 31, 2024	ROYAL BANK OF CANADA	0.27%	287.64K	200K	257.14K	+843.23%
Mar 31, 2024	BNP PARIBAS ARBITRAGE, SNC	0.36%	383.08K	265.86K	86.84K	+29.31%
Mar 31, 2024	TD ASSET MANAGEMENT INC	0.41%	436.8K	303.14K	436.8K	+100.00%
Mar 31, 2024	SHAY CAPITAL LLC	0.41%	438.51K	304.32K	438.51K	+100.00%
Mar 31, 2024	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0.72%	761.36K	528.38K	16.22K	+2.18%
Mar 31, 2024	NORTHERN TRUST CORP	0.8%	850.82K	590.47K	5.39K	+0.64%
Mar 31, 2024	RENAISSANCE TECHNOLOGIES LLC	0.93%	980.39K	680K	357.47K	+57.39%
Mar 31, 2024	STALEY CAPITAL ADVISERS INC	0.94%	1M	694K	0	0
Mar 31, 2024	JPMORGAN CHASE & CO	1.28%	1.35M	937.74K	-836.83K	-38.25%
Mar 31, 2024	WOODLINE PARTNERS LP	1.68%	1.77M	1.23M	1.77M	+100.00%
Mar 31, 2024	TANG CAPITAL MANAGEMENT LLC	1.78%	1.88M	1.3M	1.88M	+100.00%
Mar 31, 2024	GEODE CAPITAL MANAGEMENT, LLC	2.04%	2.16M	1.5M	8.44K	+0.39%
Mar 31, 2024	STATE STREET CORP	2.35%	2.49M	1.73M	-295.15K	-10.60%
Mar 31, 2024	AQR CAPITAL MANAGEMENT LLC	2.48%	2.63M	1.82M	-306.84K	-10.46%
Mar 31, 2024	VESTAL POINT CAPITAL, LP	2.64%	2.8M	1.94M	2.8M	+100.00%
Mar 31, 2024	BANK OF AMERICA CORP /DE/	6.21%	6.58M	4.57M	6.39M	+3,379.43%
Dec 31, 2023	PRIVATE ADVISOR GROUP, LLC	0.09%	95.66K	49.05K	198	+0.21%
Dec 31, 2023	ECOR1 CAPITAL, LLC	9.46%	10.07M	5.16M	10.07M	+100.00%
Dec 31, 2023	REDMILE GROUP, LLC	8.56%	9.11M	4.67M	2.83M	+44.99%
Dec 31, 2023	BLACKROCK INC.	6.66%	7.09M	3.63M	-608.72K	-7.91%
Dec 31, 2023	VANGUARD GROUP INC	6.28%	6.69M	3.43M	80.11K	+1.21%
Dec 31, 2023	UBS GROUP AG	3.47%	3.69M	1.89M	3.63M	+6,214.07%
Dec 31, 2023	AQR CAPITAL MANAGEMENT LLC	2.76%	2.93M	1.5M	2.09M	+247.24%
Dec 31, 2023	MILLENNIUM MANAGEMENT LLC	2.75%	2.92M	1.5M	2.59M	+793.09%
Dec 31, 2023	STATE STREET CORP	2.62%	2.78M	1.43M	261.51K	+10.37%
Dec 31, 2023	JPMORGAN CHASE & CO	2.06%	2.19M	1.12M	-6.48M	-74.76%
Dec 31, 2023	GEODE CAPITAL MANAGEMENT, LLC	2.02%	2.15M	1.1M	73.58K	+3.54%
Dec 31, 2023	MORGAN STANLEY	1.69%	1.79M	919.64K	-421.31K	-19.02%
Dec 31, 2023	ACADIAN ASSET MANAGEMENT LLC	1.66%	1.77M	904K	1.23M	+230.38%
Dec 31, 2023	D. E. SHAW & CO., INC.	0.97%	1.03M	530.23K	-2.88M	-73.56%
Dec 31, 2023	STALEY CAPITAL ADVISERS INC	0.94%	1M	512.8K	0	0
Dec 31, 2023	NORTHERN TRUST CORP	0.79%	845.43K	433.54K	46.51K	+5.82%
Dec 31, 2023	GSA CAPITAL PARTNERS LLP	0.74%	784.37K	402K	784.37K	+100.00%
Dec 31, 2023	JACOBS LEVY EQUITY MANAGEMENT, INC	0.73%	780.99K	400.49K	214.09K	+37.77%
Dec 31, 2023	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0.7%	745.15K	382.11K	-48.41K	-6.10%
Dec 31, 2023	RENAISSANCE TECHNOLOGIES LLC	0.59%	622.91K	319K	-206.2K	-24.87%
Dec 31, 2023	GOLDMAN SACHS GROUP INC	0.55%	582.19K	298.55K	-3.54M	-85.88%
Dec 31, 2023	PACIFIC HEIGHTS ASSET MANAGEMENT LLC	0.49%	525K	269.22K	0	0
Dec 31, 2023	FMR LLC	0.44%	464.72K	238.31K	229.18K	+97.30%
Dec 31, 2023	BANK OF NEW YORK MELLON CORP	0.37%	394.76K	202.43K	59.4K	+17.71%
Dec 31, 2023	BNP PARIBAS ARBITRAGE, SNC	0.28%	296.24K	151.91K	276.53K	+1,402.76%
Dec 31, 2023	MARSHALL WACE, LLP	0.27%	292.5K	149.18K	292.5K	+100.00%
Dec 31, 2023	CITADEL ADVISORS LLC	0.25%	263.05K	134.89K	-1.41M	-84.26%
Dec 31, 2023	HARBOR CAPITAL ADVISORS, INC.	0.2%	208.83K	107.09K	164.21K	+368.00%
Dec 31, 2023	BANK OF AMERICA CORP /DE/	0.18%	189.13K	96.83K	91.03K	+92.79%
Dec 31, 2023	ALLIANCEBERNSTEIN L.P.	0.16%	167.2K	85.74K	-9.5K	-5.38%
Dec 31, 2023	RHUMBLINE ADVISERS	0.14%	145.41K	74.58K	-60	-0.04%
Dec 31, 2023	GROUP ONE TRADING, L.P.	0.13%	140.56K	72.08M	76.47K	+119.31%
Dec 31, 2023	BARCLAYS PLC	0.12%	132.85K	69K	116.11K	+693.92%
Dec 31, 2023	JANE STREET GROUP, LLC	0.12%	132.18K	67.78K	108.77K	+464.76%
Dec 31, 2023	TWO SIGMA INVESTMENTS, LP	0.12%	129.18K	66.25K	129.18K	+100.00%
Dec 31, 2023	HRT FINANCIAL LP	0.11%	117.27K	60K	117.27K	+100.00%
Dec 31, 2023	HENNION & WALSH ASSET MANAGEMENT, INC.	0.1%	111.13K	56.99K	-57.79K	-34.21%
Dec 31, 2023	CAPTRUST FINANCIAL ADVISORS	0.08%	83.07K	42.6K	65.06K	+361.14%
Dec 31, 2023	VONTOBEL HOLDING LTD.	0.08%	80K	41.02K	80K	+100.00%
Dec 31, 2023	TWO SIGMA SECURITIES, LLC	0.06%	68.24K	35K	68.24K	+100.00%
Dec 31, 2023	PRICE T ROWE ASSOCIATES INC /MD/	0.05%	54.99K	29K	0	0
Dec 31, 2023	SG AMERICAS SECURITIES, LLC	0.05%	49.92K	26K	11.18K	+28.86%
Dec 31, 2023	AMERICAN INTERNATIONAL GROUP, INC.	0.05%	48.14K	24.69K	-194	-0.40%
Dec 31, 2023	STATE OF WISCONSIN INVESTMENT BOARD	0.04%	45.2K	23.18K	0	0
Dec 31, 2023	VOYA INVESTMENT MANAGEMENT LLC	0.04%	40.84K	20.94K	-78.42K	-65.75%
Dec 31, 2023	NEW YORK STATE COMMON RETIREMENT FUND	0.04%	39.54K	20K	-143	-0.36%
Dec 31, 2023	DEUTSCHE BANK AG\	0.04%	38.38K	19.58K	-350K	-90.12%
Dec 31, 2023	CUBIST SYSTEMATIC STRATEGIES, LLC	0.03%	36.46K	18.7K	-7.98K	-17.97%
Dec 31, 2023	XTX TOPCO LTD	0.03%	35.56K	18.24K	1.32K	+3.86%
Dec 31, 2023	POINT72 MIDDLE EAST FZE	0.03%	35.54K	18.22K	35.54K	+100.00%
Sep 30, 2023	BAUPOST GROUP LLC/MA	9.3%	9.77M	-	0	0
Sep 30, 2023	ALLSPRING GLOBAL INVESTMENTS HOLDINGS, LLC	0.04%	38.97K	-	-27.44K	-41.32%
Sep 30, 2023	NEW YORK STATE COMMON RETIREMENT FUND	0.04%	39.68K	-	314	+0.80%
Sep 30, 2023	MANUFACTURERS LIFE INSURANCE COMPANY, THE	0.04%	43.09K	-	0	0
Sep 30, 2023	ENVESTNET ASSET MANAGEMENT INC	0.04%	43.75K	-	14.16K	+47.88%
Sep 30, 2023	CUBIST SYSTEMATIC STRATEGIES, LLC	0.04%	44.44K	-	-232.13K	-83.93%
Sep 30, 2023	HARBOR CAPITAL ADVISORS, INC.	0.04%	44.62K	-	-5.46K	-10.89%
Sep 30, 2023	STATE OF WISCONSIN INVESTMENT BOARD	0.04%	45.2K	-	0	0
Sep 30, 2023	AMERICAN INTERNATIONAL GROUP, INC.	0.05%	48.34K	-	2.36K	+5.13%
Sep 30, 2023	B. METZLER SEEL. SOHN & CO. AG	0.05%	49.28K	-	-49.28K	-50.00%
Sep 30, 2023	METLIFE INVESTMENT MANAGEMENT, LLC	0.05%	49.73K	-	0	0
Sep 30, 2023	UBS GROUP AG	0.06%	58.49K	-	7.12K	+13.85%
Sep 30, 2023	ROYAL BANK OF CANADA	0.06%	60.05K	-	8.35K	+16.16%
Sep 30, 2023	GRAHAM CAPITAL MANAGEMENT, L.P.	0.06%	62.02K	-	-23.66K	-27.61%
Sep 30, 2023	GROUP ONE TRADING, L.P.	0.06%	64.09K	-	64.09K	+100.00%
Sep 30, 2023	SIMPLEX TRADING, LLC	0.09%	94.97K	-	49.71K	+109.82%
Sep 30, 2023	PRIVATE ADVISOR GROUP, LLC	0.09%	95.46K	-	33.06K	+52.99%
Sep 30, 2023	CORNERCAP INVESTMENT COUNSEL INC	0.11%	114.7K	-	-1.46K	-1.26%
Sep 30, 2023	VOYA INVESTMENT MANAGEMENT LLC	0.11%	119.26K	-	17.55K	+17.25%
Sep 30, 2023	NUVEEN ASSET MANAGEMENT, LLC	0.13%	132.87K	-	69.15K	+108.51%
Sep 30, 2023	RHUMBLINE ADVISERS	0.14%	145.47K	-	2.7K	+1.89%
Sep 30, 2023	HENNION & WALSH ASSET MANAGEMENT, INC.	0.16%	168.92K	-	-10.22K	-5.71%
Sep 30, 2023	ALLIANCEBERNSTEIN L.P.	0.17%	176.7K	-	0	0
Sep 30, 2023	RAYMOND JAMES & ASSOCIATES	0.18%	189.64K	-	2.3K	+1.23%
Sep 30, 2023	JOSH ARNOLD INVESTMENT CONSULTANT, LLC	0.19%	200K	-	30K	+17.65%
Sep 30, 2023	DIMENSIONAL FUND ADVISORS LP	0.21%	219.46K	-	-436.31K	-66.53%
Sep 30, 2023	FMR LLC	0.22%	235.54K	-	11.83K	+5.29%
Sep 30, 2023	BANK OF NEW YORK MELLON CORP	0.32%	335.36K	-	-4.08K	-1.20%
Sep 30, 2023	PINNACLE ASSOCIATES LTD	0.37%	385.36K	-	-10.23K	-2.59%
Sep 30, 2023	DEUTSCHE BANK AG\	0.37%	388.38K	-	-299.81K	-43.56%
Sep 30, 2023	CITIGROUP INC	0.43%	453.1K	-	-28.64K	-5.95%
Sep 30, 2023	EXODUSPOINT CAPITAL MANAGEMENT, LP	0.46%	486.67K	-	68.79K	+16.46%
Sep 30, 2023	PACIFIC HEIGHTS ASSET MANAGEMENT LLC	0.5%	525K	-	0	0
Sep 30, 2023	ACADIAN ASSET MANAGEMENT LLC	0.51%	534.39K	-	-170.3K	-24.17%
Sep 30, 2023	POINT72 ASSET MANAGEMENT, L.P.	0.53%	555K	-	-17.23K	-3.01%
Sep 30, 2023	JACOBS LEVY EQUITY MANAGEMENT, INC	0.54%	566.9K	-	549.97K	+3,249.06%
Sep 30, 2023	DRIEHAUS CAPITAL MANAGEMENT LLC	0.56%	589.95K	-	589.95K	+100.00%
Sep 30, 2023	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0.76%	793.56K	-	93.52K	+13.36%
Sep 30, 2023	NORTHERN TRUST CORP	0.76%	798.92K	-	3.68K	+0.46%
Sep 30, 2023	ANTIPODEAN ADVISORS LLC	0.95%	1M	-	0	0
Sep 30, 2023	STALEY CAPITAL ADVISERS INC	0.95%	1M	-	250K	+33.33%
Sep 30, 2023	AMERIPRISE FINANCIAL INC	1.57%	1.65M	-	502.9K	+43.78%
Sep 30, 2023	GEODE CAPITAL MANAGEMENT, LLC	1.98%	2.08M	-	45.02K	+2.22%
Sep 30, 2023	MORGAN STANLEY	2.11%	2.21M	-	-288.09K	-11.51%
Sep 30, 2023	D. E. SHAW & CO., INC.	3.72%	3.91M	-	-438.91K	-10.09%
Sep 30, 2023	GOLDMAN SACHS GROUP INC	3.92%	4.12M	-	-437.6K	-9.59%
Sep 30, 2023	MAVERICK CAPITAL LTD	5.99%	6.29M	-	0	0
Sep 30, 2023	BLACKROCK INC.	7.32%	7.7M	-	-567.31K	-6.87%
Sep 30, 2023	WASATCH ADVISORS LP	7.99%	8.4M	-	115.25K	+1.39%

ATRA Insiders

Insiders	Designation	Shares Held
DOBMEIER ERIC	director	563.33K
GALLAGHER CAROL GILTNER	director	459.42K
DUPONT JAKOB	EVP, Head of R&D	290.79K
BANARD CHARLENE A.	EVP, Chief Technical Officer	276.01K
HEIDEN WILLIAM K	director	209K
KOPPIKAR UTPAL	Chief Financial Officer	181.98K
JOSHI MANHER	EVP, Chief Medical Officer	171.28K
NEWELL JOE	Chief Operations Officer	113.1K
YAREMA KRISTIN	Chief Commercial Officer	97.05K
NGUYEN ANHCO	President and CEO	74.12K
TOUCHON PASCAL	President and CEO	70.13K
HYLLENGREN ERIC J	EVP, CFO and COO	56.23K
FUST MATTHEW K	director	31.5K
MURUGAN AMAR	EVP, Chief Legal Officer	26.83K
HENRICH JILL	EVP, Chief Regulatory Officer	18.68K

Buying/Selling by Insiders

Date	Insider	Type	Cost	Shares	Value ($)	Shares Total
Mar 03, 2025	HYLLENGREN ERIC J	SALE	7.00	1.21K	8.47K	56.23K
Mar 03, 2025	NGUYEN ANHCO	SALE	7.00	3.33K	23.31K	74.12K
Mar 03, 2025	HENRICH JILL	SALE	7.00	1.06K	7.41K	18.68K
Nov 18, 2024	HYLLENGREN ERIC J	SALE	11.20	1.36K	15.27K	23.39K
Nov 18, 2024	NGUYEN ANHCO	SALE	11.20	1.66K	18.63K	77.45K
Nov 18, 2024	HENRICH JILL	SALE	11.20	1K	11.2K	19.38K
Aug 16, 2024	MURUGAN AMAR	SALE	6.63	89	590.16	26.83K
Aug 16, 2024	HENRICH JILL	SALE	6.63	132	875.29	20.38K
Aug 16, 2024	TOUCHON PASCAL	SALE	6.63	276	1.83K	70.13K
Aug 16, 2024	NGUYEN ANHCO	SALE	6.63	56	371.34	34.12K
Aug 16, 2024	HYLLENGREN ERIC J	SALE	6.63	29	192.3	24.76K
May 16, 2024	MURUGAN AMAR	SALE	0.62	32.4K	19.99K	695.12K
May 16, 2024	HYLLENGREN ERIC J	SALE	0.62	28.65K	17.68K	645.67K
May 16, 2024	NGUYEN ANHCO	SALE	0.62	42.9K	26.47K	898.5K
May 16, 2024	TOUCHON PASCAL	SALE	0.62	81.51K	50.29K	1.83M
May 16, 2024	HENRICH JILL	SALE	0.62	25.75K	15.89K	529.25K
Mar 04, 2024	NGUYEN ANHCO	SALE	0.72	10.75K	7.74K	941.4K
Mar 04, 2024	MURUGAN AMAR	SALE	0.72	10.04K	7.23K	727.52K
Mar 04, 2024	HENRICH JILL	SALE	0.72	3.88K	2.79K	555K
Mar 04, 2024	HYLLENGREN ERIC J	SALE	0.72	5.22K	3.76K	674.32K
Mar 04, 2024	TOUCHON PASCAL	SALE	0.72	24.84K	17.89K	1.91M
Nov 16, 2023	MURUGAN AMAR	SALE	0.39	8.31K	3.23K	257.08K
Nov 16, 2023	JOSHI MANHER	SALE	0.39	12.29K	4.78K	171.28K
Nov 16, 2023	HENRICH JILL	SALE	0.39	3.27K	1.27K	104.42K
Nov 16, 2023	HYLLENGREN ERIC J	SALE	0.39	11.96K	4.65K	206K
Nov 16, 2023	TOUCHON PASCAL	SALE	0.39	20.41K	7.94K	655.5K
Nov 16, 2023	NGUYEN ANHCO	SALE	0.39	8.86K	3.44K	277.14K
Nov 14, 2023	GALLAGHER CAROL GILTNER	PURCHASE	0.31	90.98K	28.19K	459.42K
Nov 13, 2023	GALLAGHER CAROL GILTNER	PURCHASE	0.22	179.02K	40.03K	368.44K
Nov 10, 2023	HEIDEN WILLIAM K	PURCHASE	0.25	100K	25.33K	209K
Nov 10, 2023	DOBMEIER ERIC	PURCHASE	0.23	446.83K	101.34K	563.33K
Aug 16, 2023	NGUYEN ANHCO	SALE	1.65	9.28K	15.33K	286K
Aug 16, 2023	HENRICH JILL	SALE	1.65	558	922.93	107.69K
Aug 16, 2023	JOSHI MANHER	SALE	1.65	3.77K	6.24K	183.57K
Aug 16, 2023	HYLLENGREN ERIC J	SALE	1.65	1.78K	2.94K	217.96K
Aug 16, 2023	TOUCHON PASCAL	SALE	1.65	9.33K	15.43K	675.91K
Aug 16, 2023	MURUGAN AMAR	SALE	1.65	3.62K	5.99K	265.39K
Jun 27, 2023	TOUCHON PASCAL	SALE	1.66	14.29K	23.72K	706.67K
May 16, 2023	TOUCHON PASCAL	SALE	2.04	29.77K	60.63K	720.96K
May 16, 2023	BANARD CHARLENE A.	SALE	2.04	19.04K	38.78K	276.01K
May 16, 2023	MURUGAN AMAR	SALE	2.04	985	2.01K	270.95K
May 16, 2023	HYLLENGREN ERIC J	SALE	2.04	1.72K	3.5K	226.14K
Mar 02, 2023	KOPPIKAR UTPAL	SALE	3.63	6.87K	24.92K	181.98K
Mar 02, 2023	MURUGAN AMAR	SALE	3.63	4.22K	15.31K	279.33K
Mar 02, 2023	TOUCHON PASCAL	SALE	3.63	15.68K	56.87K	750.73K
Mar 02, 2023	DUPONT JAKOB	SALE	3.63	5.07K	18.4K	290.79K
Feb 07, 2023	KOPPIKAR UTPAL	SALE	5.46	2.49K	13.57K	188.85K
Nov 16, 2022	DUPONT JAKOB	SALE	4.49	1.12K	5.05K	154.54K
Nov 16, 2022	TOUCHON PASCAL	SALE	4.49	15.59K	70K	441.7K
Nov 16, 2022	MURUGAN AMAR	SALE	4.49	3.61K	16.22K	127.59K
Nov 16, 2022	KOPPIKAR UTPAL	SALE	4.49	1.08K	4.86K	191.33K
Aug 16, 2022	KOPPIKAR UTPAL	SALE	5.04	5.94K	29.91K	197.59K
Aug 16, 2022	DUPONT JAKOB	SALE	5.03	4.12K	20.76K	158.88K
Aug 16, 2022	TOUCHON PASCAL	SALE	5.04	14.81K	74.55K	457.29K
Aug 16, 2022	MURUGAN AMAR	SALE	5.04	2.23K	11.25K	131.2K
Jun 27, 2022	TOUCHON PASCAL	SALE	7.20	14.22K	102.38K	472.09K
Jun 08, 2022	KOPPIKAR UTPAL	SALE	5.63	5.85K	32.95K	203.53K
May 17, 2022	TOUCHON PASCAL	SALE	5.32	13.91K	73.96K	486.31K
May 17, 2022	KOPPIKAR UTPAL	SALE	5.32	966	5.14K	207.59K
May 17, 2022	MURUGAN AMAR	SALE	5.32	906	4.82K	133.74K
May 17, 2022	DUPONT JAKOB	SALE	5.32	3.87K	20.6K	163.01K
Mar 01, 2022	MURUGAN AMAR	SALE	9.86	1.11K	10.96K	136.96K
Mar 01, 2022	KOPPIKAR UTPAL	SALE	9.86	1.49K	14.7K	213.17K
Mar 01, 2022	DUPONT JAKOB	SALE	9.86	2.22K	21.89K	166.88K
Mar 01, 2022	TOUCHON PASCAL	SALE	9.86	8.83K	87.01K	500.23K
Feb 10, 2022	DUPONT JAKOB	SALE	16.00	5K	80K	90.59K
Feb 07, 2022	KOPPIKAR UTPAL	SALE	14.46	2.5K	36.1K	155.7K
Jan 03, 2022	DUPONT JAKOB	SALE	16.01	5K	80.05K	90.59K
Dec 01, 2021	DUPONT JAKOB	SALE	17.94	5K	89.69K	90.59K
Nov 16, 2021	MURUGAN AMAR	SALE	17.12	2.12K	36.36K	87.54K
Nov 16, 2021	DUPONT JAKOB	SALE	17.12	2.2K	37.64K	90.59K
Nov 16, 2021	NEWELL JOE	SALE	17.12	3.33K	57.03K	113.1K
Nov 16, 2021	TOUCHON PASCAL	SALE	17.12	8.4K	143.82K	328.49K
Nov 16, 2021	KOPPIKAR UTPAL	SALE	17.12	3.66K	62.56K	157.71K
Nov 15, 2021	NEWELL JOE	SALE	17.71	7K	124K	116.43K
Nov 04, 2021	FUST MATTHEW K	SALE	19.50	13.35K	260.4K	31.5K
Nov 02, 2021	DUPONT JAKOB	SALE	16.41	5K	82.05K	92.79K
Sep 22, 2021	NEWELL JOE	SALE	17.00	10.5K	178.5K	119.93K
Sep 15, 2021	NEWELL JOE	SALE	15.61	3.12K	48.65K	119.93K
Aug 30, 2021	NEWELL JOE	SALE	15.00	3.5K	52.5K	123.05K
Aug 17, 2021	TOUCHON PASCAL	SALE	12.53	8.22K	103.05K	336.89K
Aug 17, 2021	MURUGAN AMAR	SALE	12.53	2.08K	26.07K	89.66K
Aug 17, 2021	NEWELL JOE	SALE	12.53	2.43K	30.4K	126.55K
Aug 17, 2021	KOPPIKAR UTPAL	SALE	12.53	3.58K	44.85K	161.37K
Aug 17, 2021	DUPONT JAKOB	SALE	12.53	2.15K	26.97K	92.79K
Jun 25, 2021	TOUCHON PASCAL	SALE	16.32	14.19K	231.66K	345.11K
Jun 14, 2021	YAREMA KRISTIN	PURCHASE	14.48	3.5K	50.68K	97.05K
Jun 11, 2021	YAREMA KRISTIN	PURCHASE	14.50	2.02K	29.3K	93.55K
Jun 08, 2021	KOPPIKAR UTPAL	SALE	14.06	5.82K	81.83K	164.95K
May 18, 2021	DUPONT JAKOB	SALE	14.55	5.18K	75.43K	94.95K
May 18, 2021	NEWELL JOE	SALE	14.55	2.45K	35.69K	128.97K
May 18, 2021	TOUCHON PASCAL	SALE	14.55	8.31K	120.95K	359.31K
May 18, 2021	KOPPIKAR UTPAL	SALE	14.55	3.62K	52.61K	168.97K
May 18, 2021	YAREMA KRISTIN	SALE	14.55	761	11.07K	91.53K
May 18, 2021	MURUGAN AMAR	SALE	14.55	5.68K	82.66K	91.74K
May 17, 2021	NEWELL JOE	SALE	15.00	3.5K	52.5K	131.42K
Apr 05, 2021	NEWELL JOE	SALE	14.74	655	9.65K	134.92K
Mar 26, 2021	NEWELL JOE	SALE	14.58	2.64K	38.49K	135.58K
Mar 26, 2021	KOPPIKAR UTPAL	SALE	14.58	1.76K	25.68K	172.58K
Mar 15, 2021	NEWELL JOE	SALE	17.41	7K	121.87K	138.22K
Mar 02, 2021	KOPPIKAR UTPAL	SALE	16.74	1.46K	24.46K	174.34K
Mar 02, 2021	NEWELL JOE	SALE	16.74	1.67K	27.87K	141.72K
Mar 02, 2021	TOUCHON PASCAL	SALE	16.74	4.89K	81.81K	367.62K
Feb 08, 2021	KOPPIKAR UTPAL	SALE	20.39	1.76K	35.87K	130.55K
Feb 08, 2021	NEWELL JOE	SALE	20.39	3.89K	79.24K	105.67K
Jan 15, 2021	NEWELL JOE	SALE	18.84	7K	131.88K	109.56K
Dec 16, 2020	NEWELL JOE	SALE	23.13	3.5K	80.96K	116.56K
Nov 17, 2020	KOPPIKAR UTPAL	SALE	19.77	1.47K	29.05K	132.06K
Nov 17, 2020	NEWELL JOE	SALE	19.77	1.65K	32.59K	116.56K

Insider Transaction Summary (6 Months)

SHARESTRANS

PURCHASE00

SALES9.63K6

NET SHARES-9.63K6

NO. OF SHARES HELD269.26K6

% NET SHARES-103.58%0%

ATRA Stock Ownership Breakdown

Atara Biotherapeutics, Inc.

ATRA Stock Outstanding Shares

Market Insider ATRA

Institutional Ownership

ATRA Insiders

Buying/Selling by Insiders

Insider Transaction Summary (6 Months)

Frequently Asked Questions

ATRA Stock Outstanding Shares

Market Insider ATRA

Institutional Ownership

ATRA Insiders

Buying/Selling by Insiders

Insider Transaction Summary (6 Months)

Frequently Asked Questions