AVIR US Equity

Atea Pharmaceuticals, Inc.

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Health Care · Pharmaceutical Preparations · CIK 1593899 · FYE 1231

$4.74

+0.12 (+2.60%)

USD · as of 2026-07-30 · marketstack

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Institutional ownership· 13F filers holding AVIR · 2026-Q1 methodology → sources →

127 holders

% of shares outstanding held

75.4%

Shares held (13F)

60,096,421

Reporting holders

127

Active share of register68.2%108 active filers

Index / screened out31.8%19 filers

Reporting holders1272026-Q1

Top-10 concentration74.5%

HHI0.0897

Effective holders11.2

Crowding percentile71.0of 806 same-size names

Top holders

largest 100 of 127 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	FMR LLC	11,950,77212.0M	$64M	15.00%	ADD 23%
2	BlackRock, Inc.	8,435,4378.4M	$45M	10.59%	—
3	BML Capital Management, LLC	7,058,6577.1M	$38M	8.86%	TRIM -6%
4	TANG CAPITAL MANAGEMENT LLC	4,814,7004.8M	$26M	6.04%	—
5	VANGUARD CAPITAL MANAGEMENT LLC	3,246,1243.2M	$17M	4.07%	NEW†
6	Bain Capital Life Sciences Investors, LLC	2,360,6382.4M	$13M	2.96%	TRIM -5%
7	TWO SIGMA INVESTMENTS, LP	1,864,1641.9M	$10M	2.34%	ADD 150%
8	GEODE CAPITAL MANAGEMENT, LLC	1,747,7061.7M	$9M	2.19%	TRIM -5%
9	STATE STREET CORP	1,694,6351.7M	$9M	2.13%	TRIM -5%
10	ACADIAN ASSET MANAGEMENT LLC	1,582,8171.6M	$9M	1.99%	ADD 21%
11	DIMENSIONAL FUND ADVISORS LP	1,255,4841.3M	$7M	1.58%	TRIM -9%
12	Rosalind Advisors, Inc.	1,171,8551.2M	$6M	1.47%	NEW
13	RENAISSANCE TECHNOLOGIES LLC	1,166,4001.2M	$6M	1.46%	—
14	JPMORGAN CHASE & CO	940,157940,157	$5M	1.18%	TRIM -30%
15	MORGAN STANLEY	731,020731,020	$4M	0.92%	ADD 11%
16	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	596,709596,709	$3M	0.75%	—
17	GOLDMAN SACHS GROUP INC	588,463588,463	$3M	0.74%	ADD 25%
18	NORTHERN TRUST CORP	585,025585,025	$3M	0.73%	ADD 4%
19	VANGUARD PORTFOLIO MANAGEMENT LLC	557,579557,579	$3M	0.70%	NEW
20	VANGUARD FIDUCIARY TRUST CO	484,705484,705	$3M	0.61%	NEW
21	JANE STREET GROUP, LLC	418,296418,296	$2M	0.53%	ADD 67%
22	D. E. Shaw & Co., Inc.	379,314379,314	$2M	0.48%	TRIM -18%
23	CM Management, LLC	355,000355,000	$2M	0.45%	—
24	MILLENNIUM MANAGEMENT LLC	349,932349,932	$2M	0.44%	TRIM -50%
25	BANQUE PICTET & CIE SA	345,077345,077	$2M	0.43%	—
26	Opaleye Management Inc.	322,600322,600	$2M	0.40%	ADD 79%
27	Irenic Capital Management LP	301,699301,699	$2M	0.38%	NEW
28	Peapod Lane Capital LLC	272,820272,820	$1M	0.34%	TRIM -37%
29	HSBC HOLDINGS PLC	258,989258,989	$1M	0.33%	TRIM -46%
30	Nuveen, LLC	243,103243,103	$1M	0.31%	—
31	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	210,542210,542	$1M	0.26%	NEW
32	Bank of New York Mellon Corp	185,805185,805	$999,631	0.23%	TRIM -6%
33	Auour Investments LLC	177,000177,000	$952,260	0.22%	—
34	AMERICAN CENTURY COMPANIES INC	167,230167,230	$899,697	0.21%	—
35	BARCLAYS PLC	160,946160,946	$865,889	0.20%	TRIM -34%
36	BNP PARIBAS FINANCIAL MARKETS	156,391156,391	$841,384	0.20%	ADD 548%
37	SEI INVESTMENTS CO	156,384156,384	$841,346	0.20%	NEW
38	BRIDGEWAY CAPITAL MANAGEMENT, LLC	148,400148,400	$798,392	0.19%	—
39	Invesco Ltd.	133,348133,348	$717,412	0.17%	ADD 52%
40	Point72 Asset Management, L.P.	119,553119,553	$643,195	0.15%	ADD 87%
41	Informed Momentum Co LLC	112,866112,866	$607,219	0.14%	NEW
42	UBS Group AG	109,950109,950	$591,531	0.14%	TRIM -43%
43	PRICE T ROWE ASSOCIATES INC /MD/	106,562106,562	$574,000	0.13%	ADD 9%
44	BANK OF AMERICA CORP /DE/	105,640105,640	$568,343	0.13%	TRIM -22%
45	STATE OF WISCONSIN INVESTMENT BOARD	99,80399,803	$536,940	0.13%	ADD 9%
46	STRS OHIO	96,40096,400	$518,632	0.12%	TRIM -15%
47	Jump Financial, LLC	93,24793,247	$501,669	0.12%	ADD 388%
48	Aldebaran Capital, LLC	89,94689,946	$483,909	0.11%	—
49	RHUMBLINE ADVISERS	89,05489,054	$479,101	0.11%	TRIM -5%
50	SUSQUEHANNA INTERNATIONAL GROUP, LLP	81,83581,835	$440,272	0.10%	ADD 377%
51	ALLIANCEBERNSTEIN L.P.	121,320121,320	$433,112	0.15%	TRIM -5%
52	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	70,00070,000	$377,000	0.09%	—
53	DEUTSCHE BANK AG\	65,68665,686	$353,391	0.08%	ADD 25%
54	ALPS ADVISORS INC	64,86264,862	$348,958	0.08%	—
55	WELLINGTON MANAGEMENT GROUP LLP	57,00957,009	$306,708	0.07%	TRIM -77%
56	Susquehanna Portfolio Strategies, LLC	55,48755,487	$298,520	0.07%	NEW
57	Squarepoint Ops LLC	55,09855,098	$296,427	0.07%	ADD 185%
58	Creative Planning	51,79551,795	$278,657	0.07%	ADD 115%
59	Empowered Funds, LLC	49,46949,469	$266,143	0.06%	NEW
60	CITADEL ADVISORS LLC	48,40148,401	$260,397	0.06%	ADD 13%
61	Rangeley Capital, LLC	46,50046,500	$250,170	0.06%	TRIM -42%
62	AQR CAPITAL MANAGEMENT LLC	46,10946,109	$248,067	0.06%	ADD 222%
63	JACOBS LEVY EQUITY MANAGEMENT, INC	43,10443,104	$231,900	0.05%	—
64	MetLife Investment Management, LLC	39,77839,778	$214,006	0.05%	ADD 34%
65	Virtu Financial LLC	34,03034,030	$183,000	0.04%	NEW
66	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	33,75133,751	$181,580	0.04%	ADD 2%
67	NANO CAP NEW MILLENNIUM GROWTH FUND L P	32,50032,500	$174,850	0.04%	TRIM -35%
68	RBF Capital, LLC	30,00030,000	$161,400	0.04%	TRIM -50%
69	Russell Investments Group, Ltd.	28,01028,010	$147,904	0.04%	ADD 91%
70	WELLS FARGO & COMPANY/MN	26,76926,769	$144,017	0.03%	TRIM -66%
71	Vanguard Global Advisers, LLC	25,68125,681	$138,164	0.03%	NEW
72	Certified Advisory Corp	24,50024,500	$131,810	0.03%	—
73	XTX Topco Ltd	23,14123,141	$124,499	0.03%	ADD 122%
74	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	22,01022,010	$118,414	0.03%	—
75	MANUFACTURERS LIFE INSURANCE COMPANY, THE	20,17220,172	$108,525	0.03%	TRIM -16%
76	JOHNSON INVESTMENT COUNSEL INC	18,34018,340	$98,669	0.02%	—
77	AXQ CAPITAL, LP	18,18118,181	$97,814	0.02%	NEW
78	Police & Firemen's Retirement System of New Jersey	16,93816,938	$91,126	0.02%	—
79	INTECH INVESTMENT MANAGEMENT LLC	16,84016,840	$90,599	0.02%	TRIM -49%
80	NEW YORK STATE COMMON RETIREMENT FUND	16,34616,346	$87,941	0.02%	—
81	Quantinno Capital Management LP	15,95015,950	$85,811	0.02%	NEW
82	RFG Advisory, LLC	14,87514,875	$80,028	0.02%	—
83	VOYA INVESTMENT MANAGEMENT LLC	14,25714,257	$76,703	0.02%	TRIM -13%
84	China Universal Asset Management Co., Ltd.	13,86413,864	$74,588	0.02%	ADD 9%
85	ProShare Advisors LLC	13,63813,638	$73,372	0.02%	TRIM -17%
86	Connor, Clark & Lunn Investment Management Ltd.	12,98512,985	$69,859	0.02%	NEW
87	TWO SIGMA SECURITIES, LLC	12,13112,131	$65,265	0.02%	NEW
88	Sunpointe, LLC	11,94311,943	$64,253	0.01%	—
89	Vanguard Personalized Indexing Management, LLC	11,46411,464	$61,676	0.01%	NEW
90	PRUDENTIAL FINANCIAL INC	11,40011,400	$61,332	0.01%	NEW
91	BLAIR WILLIAM & CO/IL	10,03710,037	$53,999	0.01%	NEW
92	Blue Trust, Inc.	8,7008,700	$46,806	0.01%	—
93	SIMPLEX TRADING, LLC	6,2446,244	$33,592	0.01%	ADD 229%
94	Legal & General Group Plc	5,9335,933	$31,920	0.01%	—
95	Ameritas Investment Partners, Inc.	5,9145,914	$31,817	0.01%	TRIM -21%
96	CITIGROUP INC	5,4475,447	$29,305	0.01%	ADD 44%
97	FNY Investment Advisers, LLC	5,0005,000	$26,000	0.01%	—
98	Rockefeller Capital Management L.P.	4,8224,822	$25,942	0.01%	ADD 413%
99	Mirae Asset Global Investments Co., Ltd.	4,0754,075	$21,924	0.01%	ADD 7%
100	Tower Research Capital LLC (TRC)	3,9593,959	$21,299	0.00%	ADD 47%

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Buyers & sellers2026-Q1 vs 2025-Q4 · 65 bought / 51 sold · net +2,823,179 shares · 8.3d of ADV

Bought65 filers

Shares: 11,254,723
Value: $61M
Opened: 27 · 6,501,474 sh
Days of ADV: 33.0d

Sold51 filers

Shares: 8,431,544
Value: $45M
Closed: 11 · 5,597,414 sh
Days of ADV: 24.7d

Net (all filers) +2,823,179 sh · $15M · 4.9% of the prior register

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

FMR LLC

6.4M

6.0M

5.7M

5.8M

9.7M

12.0M

$64M

BlackRock, Inc.

9.1M

8.9M

8.7M

8.5M

8.4M

$45M

BML Capital Management, LLC

7.6M

7.5M

7.1M

$38M

TANG CAPITAL MANAGEMENT LLC

4.8M

4.9M

4.8M

$26M

VANGUARD CAPITAL MANAGEMENT LLC

—

3.2M

$17M

Bain Capital Life Sciences Investors, LLC

2.5M

2.4M

$13M

TWO SIGMA INVESTMENTS, LP

286K

252K

367K

471K

745K

1.9M

$10M

GEODE CAPITAL MANAGEMENT, LLC

1.9M

2.0M

1.9M

1.8M

1.7M

$9M

STATE STREET CORP

1.8M

1.7M

$9M

ACADIAN ASSET MANAGEMENT LLC

933K

918K

970K

1.3M

1.6M

$9M

DIMENSIONAL FUND ADVISORS LP

977K

1.2M

1.4M

1.5M

1.4M

1.3M

$7M

Rosalind Advisors, Inc.

—

1.2M

$6M

RENAISSANCE TECHNOLOGIES LLC

1.2M

1.3M

1.2M

$6M

JPMORGAN CHASE & CO

409K

773K

653K

1.2M

1.3M

940K

$5M

MORGAN STANLEY

567K

455K

544K

451K

656K

731K

$4M

Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding divides each quarter's as-filed 13F shares by the SEC cover-page share count dated to that same quarter (split-adjusted), not by today's count — so splits and buybacks don't move the line.

Quarter

Holders

Shares held

% shares out

Value held

Short interest has its own tab now — open SI →

Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.

Activists & large holders· Schedule 13D/G beneficial owners · AVIR

Full stake history →

Activists — 13D, active intent

Radoff Bradley Louis4%▲ +0.4ppSCHEDULE 13D/A · Amd 2 · event 2025-04-16SEC →

3,380,100 shares · 10 reporting persons

“Item 4 is hereby amended to add the following: On April 16, 2025, the Radoff/JEC Group entered into a letter agreement (the "Agreement") with the Issuer pursuant to which, among other things, the Issuer agreed to appoint Howard H. Berman, Ph.D. to the Board, effective immediately following the Issuer's 2025 annual meeting of stockholders (the "2025 Annual Meeting"), as a Class III director with a term expiring at the Issuer's 2026 annual meeting of stockholders (the "2026 Annual Meeting"). The I”

Large holders — 13G, passive (top 5 of 6 by % of class)

Holder	% of class	Type	As of
FMR LLC	15%	QII	2026-03-31	SEC →
Sommadossi Jean-Pierre	10.1%	Exempt	2025-03-31	SEC →

▸Register gapwho owns your peers and not you

13F

Institutional ownership· 13F filers holding AVIR · 2026-Q1 methodology → sources →

127 holders

% of shares outstanding held

75.4%

Shares held (13F)

60,096,421

Reporting holders

127

Active share of register68.2%108 active filers

Index / screened out31.8%19 filers

Reporting holders1272026-Q1

Top-10 concentration74.5%

HHI0.0897

Effective holders11.2

Crowding percentile71.0of 806 same-size names

Top holders

largest 100 of 127 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	FMR LLC	11,950,77212.0M	$64M	15.00%	ADD 23%
2	BlackRock, Inc.	8,435,4378.4M	$45M	10.59%	—
3	BML Capital Management, LLC	7,058,6577.1M	$38M	8.86%	TRIM -6%
4	TANG CAPITAL MANAGEMENT LLC	4,814,7004.8M	$26M	6.04%	—
5	VANGUARD CAPITAL MANAGEMENT LLC	3,246,1243.2M	$17M	4.07%	NEW†
6	Bain Capital Life Sciences Investors, LLC	2,360,6382.4M	$13M	2.96%	TRIM -5%
7	TWO SIGMA INVESTMENTS, LP	1,864,1641.9M	$10M	2.34%	ADD 150%
8	GEODE CAPITAL MANAGEMENT, LLC	1,747,7061.7M	$9M	2.19%	TRIM -5%
9	STATE STREET CORP	1,694,6351.7M	$9M	2.13%	TRIM -5%
10	ACADIAN ASSET MANAGEMENT LLC	1,582,8171.6M	$9M	1.99%	ADD 21%
11	DIMENSIONAL FUND ADVISORS LP	1,255,4841.3M	$7M	1.58%	TRIM -9%
12	Rosalind Advisors, Inc.	1,171,8551.2M	$6M	1.47%	NEW
13	RENAISSANCE TECHNOLOGIES LLC	1,166,4001.2M	$6M	1.46%	—
14	JPMORGAN CHASE & CO	940,157940,157	$5M	1.18%	TRIM -30%
15	MORGAN STANLEY	731,020731,020	$4M	0.92%	ADD 11%
16	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	596,709596,709	$3M	0.75%	—
17	GOLDMAN SACHS GROUP INC	588,463588,463	$3M	0.74%	ADD 25%
18	NORTHERN TRUST CORP	585,025585,025	$3M	0.73%	ADD 4%
19	VANGUARD PORTFOLIO MANAGEMENT LLC	557,579557,579	$3M	0.70%	NEW
20	VANGUARD FIDUCIARY TRUST CO	484,705484,705	$3M	0.61%	NEW
21	JANE STREET GROUP, LLC	418,296418,296	$2M	0.53%	ADD 67%
22	D. E. Shaw & Co., Inc.	379,314379,314	$2M	0.48%	TRIM -18%
23	CM Management, LLC	355,000355,000	$2M	0.45%	—
24	MILLENNIUM MANAGEMENT LLC	349,932349,932	$2M	0.44%	TRIM -50%
25	BANQUE PICTET & CIE SA	345,077345,077	$2M	0.43%	—
26	Opaleye Management Inc.	322,600322,600	$2M	0.40%	ADD 79%
27	Irenic Capital Management LP	301,699301,699	$2M	0.38%	NEW
28	Peapod Lane Capital LLC	272,820272,820	$1M	0.34%	TRIM -37%
29	HSBC HOLDINGS PLC	258,989258,989	$1M	0.33%	TRIM -46%
30	Nuveen, LLC	243,103243,103	$1M	0.31%	—
31	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	210,542210,542	$1M	0.26%	NEW
32	Bank of New York Mellon Corp	185,805185,805	$999,631	0.23%	TRIM -6%
33	Auour Investments LLC	177,000177,000	$952,260	0.22%	—
34	AMERICAN CENTURY COMPANIES INC	167,230167,230	$899,697	0.21%	—
35	BARCLAYS PLC	160,946160,946	$865,889	0.20%	TRIM -34%
36	BNP PARIBAS FINANCIAL MARKETS	156,391156,391	$841,384	0.20%	ADD 548%
37	SEI INVESTMENTS CO	156,384156,384	$841,346	0.20%	NEW
38	BRIDGEWAY CAPITAL MANAGEMENT, LLC	148,400148,400	$798,392	0.19%	—
39	Invesco Ltd.	133,348133,348	$717,412	0.17%	ADD 52%
40	Point72 Asset Management, L.P.	119,553119,553	$643,195	0.15%	ADD 87%
41	Informed Momentum Co LLC	112,866112,866	$607,219	0.14%	NEW
42	UBS Group AG	109,950109,950	$591,531	0.14%	TRIM -43%
43	PRICE T ROWE ASSOCIATES INC /MD/	106,562106,562	$574,000	0.13%	ADD 9%
44	BANK OF AMERICA CORP /DE/	105,640105,640	$568,343	0.13%	TRIM -22%
45	STATE OF WISCONSIN INVESTMENT BOARD	99,80399,803	$536,940	0.13%	ADD 9%
46	STRS OHIO	96,40096,400	$518,632	0.12%	TRIM -15%
47	Jump Financial, LLC	93,24793,247	$501,669	0.12%	ADD 388%
48	Aldebaran Capital, LLC	89,94689,946	$483,909	0.11%	—
49	RHUMBLINE ADVISERS	89,05489,054	$479,101	0.11%	TRIM -5%
50	SUSQUEHANNA INTERNATIONAL GROUP, LLP	81,83581,835	$440,272	0.10%	ADD 377%
51	ALLIANCEBERNSTEIN L.P.	121,320121,320	$433,112	0.15%	TRIM -5%
52	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	70,00070,000	$377,000	0.09%	—
53	DEUTSCHE BANK AG\	65,68665,686	$353,391	0.08%	ADD 25%
54	ALPS ADVISORS INC	64,86264,862	$348,958	0.08%	—
55	WELLINGTON MANAGEMENT GROUP LLP	57,00957,009	$306,708	0.07%	TRIM -77%
56	Susquehanna Portfolio Strategies, LLC	55,48755,487	$298,520	0.07%	NEW
57	Squarepoint Ops LLC	55,09855,098	$296,427	0.07%	ADD 185%
58	Creative Planning	51,79551,795	$278,657	0.07%	ADD 115%
59	Empowered Funds, LLC	49,46949,469	$266,143	0.06%	NEW
60	CITADEL ADVISORS LLC	48,40148,401	$260,397	0.06%	ADD 13%
61	Rangeley Capital, LLC	46,50046,500	$250,170	0.06%	TRIM -42%
62	AQR CAPITAL MANAGEMENT LLC	46,10946,109	$248,067	0.06%	ADD 222%
63	JACOBS LEVY EQUITY MANAGEMENT, INC	43,10443,104	$231,900	0.05%	—
64	MetLife Investment Management, LLC	39,77839,778	$214,006	0.05%	ADD 34%
65	Virtu Financial LLC	34,03034,030	$183,000	0.04%	NEW
66	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	33,75133,751	$181,580	0.04%	ADD 2%
67	NANO CAP NEW MILLENNIUM GROWTH FUND L P	32,50032,500	$174,850	0.04%	TRIM -35%
68	RBF Capital, LLC	30,00030,000	$161,400	0.04%	TRIM -50%
69	Russell Investments Group, Ltd.	28,01028,010	$147,904	0.04%	ADD 91%
70	WELLS FARGO & COMPANY/MN	26,76926,769	$144,017	0.03%	TRIM -66%
71	Vanguard Global Advisers, LLC	25,68125,681	$138,164	0.03%	NEW
72	Certified Advisory Corp	24,50024,500	$131,810	0.03%	—
73	XTX Topco Ltd	23,14123,141	$124,499	0.03%	ADD 122%
74	STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM	22,01022,010	$118,414	0.03%	—
75	MANUFACTURERS LIFE INSURANCE COMPANY, THE	20,17220,172	$108,525	0.03%	TRIM -16%
76	JOHNSON INVESTMENT COUNSEL INC	18,34018,340	$98,669	0.02%	—
77	AXQ CAPITAL, LP	18,18118,181	$97,814	0.02%	NEW
78	Police & Firemen's Retirement System of New Jersey	16,93816,938	$91,126	0.02%	—
79	INTECH INVESTMENT MANAGEMENT LLC	16,84016,840	$90,599	0.02%	TRIM -49%
80	NEW YORK STATE COMMON RETIREMENT FUND	16,34616,346	$87,941	0.02%	—
81	Quantinno Capital Management LP	15,95015,950	$85,811	0.02%	NEW
82	RFG Advisory, LLC	14,87514,875	$80,028	0.02%	—
83	VOYA INVESTMENT MANAGEMENT LLC	14,25714,257	$76,703	0.02%	TRIM -13%
84	China Universal Asset Management Co., Ltd.	13,86413,864	$74,588	0.02%	ADD 9%
85	ProShare Advisors LLC	13,63813,638	$73,372	0.02%	TRIM -17%
86	Connor, Clark & Lunn Investment Management Ltd.	12,98512,985	$69,859	0.02%	NEW
87	TWO SIGMA SECURITIES, LLC	12,13112,131	$65,265	0.02%	NEW
88	Sunpointe, LLC	11,94311,943	$64,253	0.01%	—
89	Vanguard Personalized Indexing Management, LLC	11,46411,464	$61,676	0.01%	NEW
90	PRUDENTIAL FINANCIAL INC	11,40011,400	$61,332	0.01%	NEW
91	BLAIR WILLIAM & CO/IL	10,03710,037	$53,999	0.01%	NEW
92	Blue Trust, Inc.	8,7008,700	$46,806	0.01%	—
93	SIMPLEX TRADING, LLC	6,2446,244	$33,592	0.01%	ADD 229%
94	Legal & General Group Plc	5,9335,933	$31,920	0.01%	—
95	Ameritas Investment Partners, Inc.	5,9145,914	$31,817	0.01%	TRIM -21%
96	CITIGROUP INC	5,4475,447	$29,305	0.01%	ADD 44%
97	FNY Investment Advisers, LLC	5,0005,000	$26,000	0.01%	—
98	Rockefeller Capital Management L.P.	4,8224,822	$25,942	0.01%	ADD 413%
99	Mirae Asset Global Investments Co., Ltd.	4,0754,075	$21,924	0.01%	ADD 7%
100	Tower Research Capital LLC (TRC)	3,9593,959	$21,299	0.00%	ADD 47%

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Buyers & sellers2026-Q1 vs 2025-Q4 · 65 bought / 51 sold · net +2,823,179 shares · 8.3d of ADV

Bought65 filers

Shares: 11,254,723
Value: $61M
Opened: 27 · 6,501,474 sh
Days of ADV: 33.0d

Sold51 filers

Shares: 8,431,544
Value: $45M
Closed: 11 · 5,597,414 sh
Days of ADV: 24.7d

Net (all filers) +2,823,179 sh · $15M · 4.9% of the prior register

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

FMR LLC

6.4M

6.0M

5.7M

5.8M

9.7M

12.0M

$64M

BlackRock, Inc.

9.1M

8.9M

8.7M

8.5M

8.4M

$45M

BML Capital Management, LLC

7.6M

7.5M

7.1M

$38M

TANG CAPITAL MANAGEMENT LLC

4.8M

4.9M

4.8M

$26M

VANGUARD CAPITAL MANAGEMENT LLC

—

3.2M

$17M

Bain Capital Life Sciences Investors, LLC

2.5M

2.4M

$13M

TWO SIGMA INVESTMENTS, LP

286K

252K

367K

471K

745K

1.9M

$10M

GEODE CAPITAL MANAGEMENT, LLC

1.9M

2.0M

1.9M

1.8M

1.7M

$9M

STATE STREET CORP

1.8M

1.7M

$9M

ACADIAN ASSET MANAGEMENT LLC

933K

918K

970K

1.3M

1.6M

$9M

DIMENSIONAL FUND ADVISORS LP

977K

1.2M

1.4M

1.5M

1.4M

1.3M

$7M

Rosalind Advisors, Inc.

—

1.2M

$6M

RENAISSANCE TECHNOLOGIES LLC

1.2M

1.3M

1.2M

$6M

JPMORGAN CHASE & CO

409K

773K

653K

1.2M

1.3M

940K

$5M

MORGAN STANLEY

567K

455K

544K

451K

656K

731K

$4M

Institutional footprint by quarter

Quarter

Holders

Shares held

% shares out

Value held

Short interest has its own tab now — open SI →

Activists & large holders· Schedule 13D/G beneficial owners · AVIR

Full stake history →

Activists — 13D, active intent

Radoff Bradley Louis4%▲ +0.4ppSCHEDULE 13D/A · Amd 2 · event 2025-04-16SEC →

3,380,100 shares · 10 reporting persons

Large holders — 13G, passive (top 5 of 6 by % of class)

Holder	% of class	Type	As of
FMR LLC	15%	QII	2026-03-31	SEC →
Sommadossi Jean-Pierre	10.1%	Exempt	2025-03-31	SEC →

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13F

AVIR US Equity☆

Institutional ownership· 13F filers holding AVIR · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · AVIR

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Institutional ownership· 13F filers holding AVIR · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · AVIR

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AVIR US Equity