Atara Biotherapeutics Ownership | Who Owns Atara Biotherapeutics?

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Atara Biotherapeutics Ownership Summary

Atara Biotherapeutics is owned by 1.91% institutional investors, 20.64% insiders, and 77.45% retail investors. Ecor1 capital is the largest institutional shareholder, holding 4.70% of ATRA shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 2.05% of its assets in Atara Biotherapeutics shares.

ATRA Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Atara Biotherapeutics	1.91%	20.64%	77.45%
Sector	Healthcare Stocks	42.54%	10.82%	46.64%
Industry	Biotech Stocks	45.21%	10.75%	44.04%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Ecor1 capital	573.18K	4.70%	$8.21M
Redmile group	441.70K	3.62%	$6.33M
Vanguard group	203.44K	1.67%	$2.92M
Marshall wace, llp	115.80K	0.95%	$1.66M
Blackrock funding, inc. /de	69.83K	0.57%	$1.00M
Mackenzie financial	63.82K	0.52%	$914.48K
Geode capital management	60.53K	0.50%	$867.50K
Acadian asset management	56.42K	0.46%	$807.00K
Staley capital advisers	50.00K	0.41%	$716.50K
Morgan stanley	35.94K	0.29%	$514.99K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Redmile group	441.70K	0.62%	$6.33M
Ecor1 capital	573.18K	0.39%	$8.21M
Globeflex capital l p	15.46K	0.03%	$221.51K
Gsa capital partners llp	26.21K	0.03%	$376.00K
Staley capital advisers	50.00K	0.03%	$716.50K
Bridgeway capital management	14.00K	0.00%	$200.62K
Quadrature capital	16.54K	0.00%	$236.88K
Marshall wace, llp	115.80K	0.00%	$1.66M
Private wealth asset management	900.00	0.00%	$12.90K
Acadian asset management	56.42K	0.00%	$807.00K

Top Buyers

Holder	Shares	% Assets	Change
Marshall wace, llp	115.80K	0.00%	73.44K
Mackenzie financial	63.82K	0.00%	41.30K
Jane street group	22.06K	-	22.06K
Morgan stanley	35.94K	-	21.01K
Cambridge investment research advisors	17.11K	0.00%	17.11K

Top Sellers

Holder	Shares	% Assets	Change
Blackrock	-	-	-6.83M
Bank of america corp /de/	-	-	-6.58M
Price t rowe associates inc /md/	-	-	-4.96M
Aqr capital management	-	-	-2.63M
Woodline partners lp	-	-	-1.77M

New Positions

Holder	Shares	% Assets	Change	Value
Jane street group	22.06K	-	22.06K	$316.12M
Cambridge investment research advisors	17.11K	0.00%	17.11K	$245.00K
Quadrature capital	16.54K	0.00%	16.54K	$236.88K
Globeflex capital l p	15.46K	0.03%	15.46K	$221.51K
Private wealth asset management	900.00	0.00%	900.00	$12.90K

Sold Out

Holder	Change
Citigroup	-2.00
Nelson, van denburg & campbell wealth management group	-23.00
Eversource wealth advisors	-35.00
Nisa investment advisors	-50.00
Gamma investing	-56.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Sep 30, 2025	8	-73.33%	233,049	-86.80%	1	0.91%	3	-62.50%	-	-100.00%
Jun 30, 2025	32	-8.57%	1,803,950	19.18%	14	7.48%	11	-8.33%	6	-53.85%
Mar 31, 2025	36	-14.29%	2,086,297	-10.96%	19	4.03%	13	-43.48%	13	18.18%
Dec 31, 2024	2	100.00%	63	80.00%	-	360000.00%	1	-	-	-
Sep 30, 2024	1	-80.00%	35	-99.98%	-	2.78%	-	-100.00%	-	-100.00%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	120.26K	2.05%	-
Vanguard Total Stock Mkt Idx Inv	117.69K	1.69%	-2.57K
Vanguard Institutional Extnd Mkt Idx Tr	49.27K	0.71%	-17.18K
Fidelity Extended Market Index	28.89K	0.41%	-238.00
Fidelity VIP Disciplined Small Cap Init	16.24K	0.23%	-
Bridgeway Ultra-Small Company Market	14.00K	0.20%	-
Fidelity Enhanced Small Cap ETF	10.45K	0.18%	-
NT R2000 Value Index Fund - NL	255.47K	0.18%	-
NT R2000 Index Fund - NL	9.83K	0.17%	-1.01K
Fidelity Total Market Index	10.57K	0.15%	-22.00

Recent Insider Transactions

Date	Name	Role	Activity	Value
Nov 17, 2025	Nguyen AnhCo	President and CEO	Sell	$738.53
Nov 17, 2025	Nguyen AnhCo	President and CEO	Sell	$37.70K
Nov 17, 2025	Grant-Huerta Yanina	Chief Accounting Officer	Sell	$1.12K
Nov 17, 2025	Grant-Huerta Yanina	Chief Accounting Officer	Sell	$21.69K
Nov 17, 2025	Grant-Huerta Yanina	Chief Accounting Officer	Sell	$976.13

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	5
2025 Q3	2	6
2025 Q2	-	2
2025 Q1	-	3
2024 Q4	-	3

ATRA Ownership FAQ

Who Owns Atara Biotherapeutics?

Atara Biotherapeutics shareholders are primarily institutional investors at 1.91%, followed by 20.64% insiders and 77.45% retail investors. The average institutional ownership in Atara Biotherapeutics's industry, Biotech Stocks , is 45.21%, which Atara Biotherapeutics falls below.

Who owns the most shares of Atara Biotherapeutics?

Atara Biotherapeutics’s largest shareholders are Ecor1 capital (573.18K shares, 4.70%), Redmile group (441.7K shares, 3.62%), and Vanguard group (203.44K shares, 1.67%). Together, they hold 9.99% of Atara Biotherapeutics’s total shares outstanding.

Does Blackrock own Atara Biotherapeutics?

BlackRock is not among the top 10 institutional shareholders of Atara Biotherapeutics.

Who is Atara Biotherapeutics’s biggest shareholder by percentage of total assets invested?

Redmile group is Atara Biotherapeutics’s biggest shareholder by percentage of total assets invested, with 0.62% of its assets in 441.7K Atara Biotherapeutics shares, valued at 6.33M$.

Who is the top mutual fund holder of Atara Biotherapeutics shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Atara Biotherapeutics shares, with 2.05% of its total shares outstanding invested in 120.26K Atara Biotherapeutics shares.

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