CITADEL ADVISORS LLC

Position in ATRA — Atara Biotherapeutics, Inc.

CIK 1423053 MIAMI, FL

Back to ATRA Full portfolio

Position in ATRA

as of Jun 30, 2026 · filed Sep 2, 2026 Compact

Position Value

$116,625

-$165,162 QoQ

Shares Held

10,159

-34.8% QoQ

Ownership

0.101%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#19

of 36 holders

Holding Since

Mar 2020

23 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in ATRA Over Time

Shares Held

Position Value (USD)

Derivatives in ATRA

reported options exposure · as of Jun 30, 2024

CallValue

$4,420

CallShares

520

PutValue

$1,768

PutShares

208

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Biotechnology

Healthcare · as of Jun 30, 2026

CITADEL ADVISORS LLC holds $6,149,545,836 across 435 Biotechnology names. ATRA ranks #344 (0.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ONC	BeOne Medicines Ltd.	1,425,517	$406,229,578
2	BBIO	BridgeBio Pharma, Inc.	3,760,028	$280,046,885
3	INSM	INSMED Inc	2,556,973	$272,624,460
4	MDGL	Madrigal Pharmaceuticals, Inc.	507,233	$272,358,759
5	VRTX	Vertex Pharmaceuticals Inc / Ma	510,430	$253,545,893
6	JAZZ	Jazz Pharmaceuticals plc	1,006,676	$242,578,715
7	MANE	Veradermics, Inc	1,877,775	$230,853,658
8	ROIV	Roivant Sciences Ltd.	5,576,261	$197,343,876

All Filings in ATRA

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50 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$116,625	10,159	-34.8%	Shares	Defined	2026-09-02
2025-12-31	$281,787	15,577	-32.3%	Shares	Defined	2026-02-17
2025-06-30	$177,583	23,003	-91.4%	Shares	Defined	2025-08-14
2024-12-31	$3,558,467	267,353	+2.6%	Shares	Defined	2025-02-14
2024-09-30	$2,117,702	260,480	0.0%	Shares	Defined	2024-11-14
2024-06-30	$4,420	520	-97.2%	Call	Defined	2024-08-14
2024-06-30	$2,214,080	260,480	-96.0%	Shares	Defined	2024-08-14
2024-06-30	$1,768	208	-99.6%	Put	Defined	2024-08-14
2024-03-31	$12,769	18,400	+93.7%	Call	Defined	2024-05-15
2024-03-31	$4,519,371	6,512,063	+2375.6%	Shares	Defined	2024-05-15
2024-03-31	$35,602	51,300	+25550.0%	Put	Defined	2024-05-15
2023-12-31	$102	200	-99.6%	Put	Defined	2024-02-14
2023-12-31	$134,945	263,051	-84.3%	Shares	Defined	2024-02-14
2023-12-31	$4,873	9,500	-98.8%	Call	Defined	2024-02-14
2023-09-30	$1,144,188	773,100	+0.6%	Call	Defined	2023-11-14
2023-09-30	$2,473,294	1,671,145	+47.5%	Shares	Defined	2023-11-14
2023-09-30	$69,708	47,100	+246.3%	Put	Defined	2023-11-14
2023-06-30	$1,824,585	1,133,283	-49.7%	Shares	Defined	2023-08-14
2023-06-30	$21,896	13,600	+138.6%	Put	Defined	2023-08-14
2023-06-30	$1,236,963	768,300	-2.1%	Call	Defined	2023-08-14
2023-03-31	$16,530	5,700	-16.2%	Put	Defined	2023-05-15
2023-03-31	$2,275,630	784,700	-2.2%	Call	Defined	2023-05-15
2023-03-31	$6,529,981	2,251,718	+61.1%	Shares	Defined	2023-05-15
2022-12-31	$22,304	6,800	-35.8%	Put	Defined	2023-02-14
2022-12-31	$2,630,888	802,100	+6265.9%	Call	Defined	2023-02-14
2022-12-31	$4,584,668	1,397,765	+4325.3%	Shares	Defined	2023-02-14
2022-09-30	$119,395	31,586	+9.9%	Shares	Defined	2022-11-14
2022-09-30	$47,628	12,600	-20.3%	Call	Defined	2022-11-14
2022-06-30	$123,082	15,800	-25.8%	Call	Defined	2022-08-15
2022-06-30	$223,915	28,744	-78.7%	Shares	Defined	2022-08-15
2022-03-31	$197,877	21,300	-38.8%	Call	Defined	2022-05-16
2022-03-31	$1,251,762	134,743	+96.0%	Shares	Defined	2022-05-16
2021-12-31	$167,056	10,600	-34.2%	Put	Defined	2022-02-14
2021-12-31	$548,448	34,800	+121.7%	Call	Defined	2022-02-14
2021-12-31	$1,083,278	68,736	+111.1%	Shares	Defined	2022-02-14
2021-09-30	$582,859	32,562	+135.2%	Shares	Defined	2021-11-15
2021-09-30	$288,190	16,100	-41.0%	Put	Defined	2021-11-15
2021-09-30	$281,030	15,700	-32.0%	Call	Defined	2021-11-15
2021-06-30	$424,515	27,300	+39.3%	Put	Defined	2021-08-16
2021-06-30	$215,243	13,842	-93.5%	Shares	Defined	2021-08-16
2021-06-30	$359,205	23,100	-64.7%	Call	Defined	2021-08-16
2021-03-31	$939,144	65,400	+110.3%	Call	Defined	2021-05-21
2021-03-31	$281,456	19,600	-5.3%	Put	Defined	2021-05-21
2021-03-31	$3,077,276	214,295	-22.0%	Shares	Defined	2021-05-21
2020-12-31	$406,341	20,700	+78.4%	Put	Defined	2021-02-16
2020-12-31	$5,390,240	274,592	-40.3%	Shares	Defined	2021-02-16
2020-12-31	$610,493	31,100	-9.9%	Call	Defined	2021-02-16
2020-09-30	$5,963,244	460,127	—	Shares	Defined	2020-11-16
2020-09-30	$447,120	34,500	—	Call	Defined	2020-11-16
2020-09-30	$150,336	11,600	—	Put	Defined	2020-11-16
No filing history on record for this holder in this stock.