VSTM US Equity

Verastem, Inc.

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Health Care · Pharmaceutical Preparations · CIK 1526119 · FYE 1231

$6.23

+0.15 (+2.47%)

USD · as of 2026-07-28 · marketstack

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

155 holders

% of shares outstanding held

92.6%

Shares held (13F)

81,384,854

Reporting holders

155

Top holders

largest 100 of 155 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	RTW INVESTMENTS, LP	6,576,3066.6M	$35M	7.48%	—
2	BlackRock, Inc.	6,194,9256.2M	$33M	7.05%	ADD 30%
3	Deep Track Capital, LP	5,740,8505.7M	$30M	6.53%	—
4	ARMISTICE CAPITAL, LLC	4,592,0004.6M	$24M	5.23%	ADD 30%
5	Nantahala Capital Management, LLC	3,584,8203.6M	$19M	4.08%	ADD 676%
6	STATE STREET CORP	3,516,6513.5M	$19M	4.00%	ADD 9%
7	VANGUARD CAPITAL MANAGEMENT LLC	3,322,7703.3M	$18M	3.78%	NEW†
8	Stonepine Capital Management, LLC	3,302,3003.3M	$18M	3.76%	ADD 21%
9	Foresite Capital Management VI LLC	3,146,6313.1M	$17M	3.58%	—
10	MILLENNIUM MANAGEMENT LLC	2,411,9652.4M	$13M	2.74%	ADD 334%
11	CITADEL ADVISORS LLC	2,308,6692.3M	$12M	2.63%	—
12	MORGAN STANLEY	2,247,2732.2M	$12M	2.56%	ADD 20%
13	Rosalind Advisors, Inc.	2,138,4752.1M	$11M	2.43%	ADD 20%
14	Alyeska Investment Group, L.P.	2,050,0002.0M	$11M	2.33%	NEW†
15	AIGH Capital Management LLC	2,000,0002.0M	$11M	2.28%	NEW†
16	GEODE CAPITAL MANAGEMENT, LLC	1,717,5571.7M	$9M	1.95%	ADD 23%
17	J. Goldman & Co LP	1,680,7521.7M	$9M	1.91%	ADD 77%
18	GOLDMAN SACHS GROUP INC	1,484,0031.5M	$8M	1.69%	—
19	Qube Research & Technologies Ltd	1,476,0281.5M	$8M	1.68%	ADD 479%
20	ACORN CAPITAL ADVISORS, LLC	1,469,1531.5M	$8M	1.67%	—
21	NEXTBio Capital Management LP	1,306,8001.3M	$7M	1.49%	—
22	FRANKLIN RESOURCES INC	1,105,8851.1M	$6M	1.26%	ADD 19%
23	Logos Global Management LP	1,000,0001.0M	$5M	1.14%	TRIM -41%
24	Ishara Investments LP	820,000820,000	$4M	0.93%	ADD 204%
25	Longaeva Partners L.P.	807,755807,755	$4M	0.92%	NEW
26	VANGUARD PORTFOLIO MANAGEMENT LLC	756,875756,875	$4M	0.86%	NEW
27	TWO SIGMA INVESTMENTS, LP	667,010667,010	$4M	0.76%	ADD 40%
28	Exome Asset Management LLC	636,700636,700	$3M	0.72%	ADD 58%
29	BAKER BROS. ADVISORS LP	584,757584,757	$3M	0.67%	NEW
30	JANE STREET GROUP, LLC	570,618570,618	$3M	0.65%	ADD 78%
31	Jefferies Financial Group Inc.	556,016556,016	$3M	0.63%	—
32	UBS Group AG	543,689543,689	$3M	0.62%	ADD 8%
33	NORTHERN TRUST CORP	515,786515,786	$3M	0.59%	ADD 31%
34	Pinnacle Financial Partners, Inc.	495,266495,266	$3M	0.56%	ADD 27%
35	VANGUARD FIDUCIARY TRUST CO	494,694494,694	$3M	0.56%	NEW
36	FMR LLC	473,657473,657	$3M	0.54%	ADD 19%
37	TORONTO DOMINION BANK	460,413460,413	$2M	0.52%	—
38	BANK OF AMERICA CORP /DE/	416,985416,985	$2M	0.47%	ADD 32%
39	Balyasny Asset Management L.P.	409,779409,779	$2M	0.47%	TRIM -87%
40	XTX Topco Ltd	395,834395,834	$2M	0.45%	ADD 202%
41	CANTOR FITZGERALD, L. P.	363,132363,132	$2M	0.41%	ADD 759%
42	Y-Intercept (Hong Kong) Ltd	345,571345,571	$2M	0.39%	TRIM -5%
43	SPHERA FUNDS MANAGEMENT LTD.	343,678343,678	$2M	0.39%	—
44	ALGERT GLOBAL LLC	305,246305,246	$2M	0.35%	ADD 2675%
45	Torray Investment Partners LLC	298,958298,958	$2M	0.34%	ADD 38%
46	Squarepoint Ops LLC	270,553270,553	$1M	0.31%	—
47	Palo Alto Investors LP	246,093246,093	$1M	0.28%	NEW
48	PANAGORA ASSET MANAGEMENT INC	244,103244,103	$1M	0.28%	—
49	Hennion & Walsh Asset Management, Inc.	221,323221,323	$1M	0.25%	ADD 27%
50	SG Americas Securities, LLC	215,004215,004	$1M	0.24%	TRIM -45%
51	Ikarian Capital, LLC	213,865213,865	$1M	0.24%	—
52	Nuveen, LLC	206,096206,096	$1M	0.23%	ADD 9%
53	RAYMOND JAMES FINANCIAL INC	199,003199,003	$1M	0.23%	—
54	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	196,501196,501	$1M	0.22%	ADD 22%
55	ExodusPoint Capital Management, LP	183,976183,976	$975,073	0.21%	ADD 75%
56	Bank of New York Mellon Corp	161,707161,707	$857,046	0.18%	ADD 32%
57	WELLINGTON MANAGEMENT GROUP LLP	151,240151,240	$801,572	0.17%	ADD 4%
58	Birchview Capital, LP	150,000150,000	$795,000	0.17%	—
59	PRELUDE CAPITAL MANAGEMENT, LLC	144,719144,719	$767,011	0.16%	ADD 95%
60	Seven Fleet Capital Management LP	123,400123,400	$654,020	0.14%	ADD 715%
61	Jump Financial, LLC	118,473118,473	$627,906	0.13%	NEW
62	Susquehanna Portfolio Strategies, LLC	114,891114,891	$608,922	0.13%	NEW
63	ROYAL BANK OF CANADA	110,729110,729	$587,000	0.13%	ADD 15%
64	Rafferty Asset Management, LLC	109,123109,123	$578,352	0.12%	TRIM -16%
65	Invesco Ltd.	104,049104,049	$551,460	0.12%	—
66	Knott David M Jr	104,000104,000	$551,200	0.12%	NEW
67	Quarry LP	100,000100,000	$530,000	0.11%	ADD 270%
68	ALLIANCEBERNSTEIN L.P.	67,27067,270	$519,324	0.08%	—
69	Man Group plc	96,83396,833	$513,215	0.11%	NEW
70	SUSQUEHANNA INTERNATIONAL GROUP, LLP	91,76091,760	$486,328	0.10%	TRIM -36%
71	BARCLAYS PLC	90,30090,300	$478,591	0.10%	TRIM -55%
72	Quantinno Capital Management LP	74,28574,285	$393,710	0.08%	NEW
73	RHUMBLINE ADVISERS	71,97371,973	$381,451	0.08%	ADD 19%
74	ADAR1 Capital Management, LLC	71,10071,100	$376,830	0.08%	NEW
75	BOOTHBAY FUND MANAGEMENT, LLC	68,54168,541	$363,267	0.08%	—
76	Graham Capital Management, L.P.	67,06567,065	$355,445	0.08%	ADD 186%
77	AQR CAPITAL MANAGEMENT LLC	66,06566,065	$350,143	0.08%	ADD 35%
78	DEUTSCHE BANK AG\	62,80462,804	$332,862	0.07%	ADD 38%
79	Quadrature Capital Ltd	52,09852,098	$276,119	0.06%	NEW
80	Brevan Howard Capital Management LP	51,15851,158	$270,882	0.06%	ADD 103%
81	PROFUND ADVISORS LLC	48,76148,761	$258,433	0.06%	ADD 2%
82	PRICE T ROWE ASSOCIATES INC /MD/	46,82746,827	$249,000	0.05%	ADD 72%
83	WINTON GROUP Ltd	46,20046,200	$244,860	0.05%	NEW
84	Cetera Investment Advisers	43,34643,346	$229,734	0.05%	—
85	Aquatic Capital Management LLC	42,88042,880	$227,264	0.05%	ADD 39%
86	Vanguard Global Advisers, LLC	42,70142,701	$226,315	0.05%	NEW
87	ENVESTNET ASSET MANAGEMENT INC	42,39242,392	$224,678	0.05%	—
88	HSBC HOLDINGS PLC	39,39039,390	$209,752	0.04%	NEW
89	STIFEL FINANCIAL CORP	38,89138,891	$206,127	0.04%	TRIM -2%
90	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	39,00739,007	$203,322	0.04%	ADD 21%
91	Dauntless Investment Group, LLC	36,75036,750	$194,775	0.04%	NEW
92	Arrowpoint Investment Partners (Singapore) Pte. Ltd.	36,17036,170	$191,701	0.04%	NEW
93	FOX RUN MANAGEMENT, L.L.C.	39,00439,004	$189,169	0.04%	TRIM -32%
94	MetLife Investment Management, LLC	32,95832,958	$174,677	0.04%	ADD 14%
95	CANADA PENSION PLAN INVESTMENT BOARD	32,60032,600	$172,780	0.04%	ADD 161%
96	WELLS FARGO & COMPANY/MN	30,08630,086	$159,456	0.03%	TRIM -52%
97	MIZUHO SECURITIES USA LLC	30,00030,000	$159,000	0.03%	NEW
98	LOS ANGELES CAPITAL MANAGEMENT LLC	29,52029,520	$156,456	0.03%	NEW
99	Virtus Investment Advisers, LLC	28,37428,374	$150,382	0.03%	ADD 2%
100	D. E. Shaw & Co., Inc.	26,65926,659	$141,293	0.03%	TRIM -92%

† 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.

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

RTW INVESTMENTS, LP

—

4.2M

4.3M

5.4M

6.6M

$35M

BlackRock, Inc.

2.4M

2.5M

2.8M

3.7M

4.8M

6.2M

$33M

Deep Track Capital, LP

—

5.7M

$30M

ARMISTICE CAPITAL, LLC

—

2.1M

3.5M

4.6M

$24M

Nantahala Capital Management, LLC

3.8M

2.3M

3.0M

1.3M

462K

3.6M

$19M

STATE STREET CORP

742K

812K

2.3M

2.2M

3.2M

3.5M

$19M

VANGUARD CAPITAL MANAGEMENT LLC

—

3.3M

$18M

Stonepine Capital Management, LLC

870K

613K

1.4M

2.7M

3.3M

$18M

Foresite Capital Management VI LLC

—

1.3M

2.6M

3.1M

$17M

MILLENNIUM MANAGEMENT LLC

38K

185K

53K

1.2M

555K

2.4M

$13M

CITADEL ADVISORS LLC

342K

—

185K

2.4M

2.3M

$12M

MORGAN STANLEY

812K

1.2M

1.1M

1.6M

1.9M

2.2M

$12M

Rosalind Advisors, Inc.

900K

2.6M

2.0M

1.9M

1.8M

2.1M

$11M

Alyeska Investment Group, L.P.

—

132K

—

2.0M

$11M

AIGH Capital Management LLC

2.7M

2.3M

2.0M

—

2.0M

$11M

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 uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	155	81,384,854	92.6%	$431M
2025-Q4

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 · VSTM

Large holders — 13G, passive (top 5 of 19 by % of class)

Holder

% of class

Type

As of

Deep Track Capital, LP

9.99%

Passive

2025-11-14

SEC →

RTW INVESTMENTS, LP

9.9%

QII

2026-03-31

SEC →

Soleus Capital Master Fund, L.P.

7.3%

Passive

2024-12-31

SEC →

BlackRock, Inc.

QII

2025-09-30

SEC →

ARMISTICE CAPITAL, LLC

5.23%

QII

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

155 holders

% of shares outstanding held

92.6%

Shares held (13F)

81,384,854

Reporting holders

155

Top holders

largest 100 of 155 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	RTW INVESTMENTS, LP	6,576,3066.6M	$35M	7.48%	—
2	BlackRock, Inc.	6,194,9256.2M	$33M	7.05%	ADD 30%
3	Deep Track Capital, LP	5,740,8505.7M	$30M	6.53%	—
4	ARMISTICE CAPITAL, LLC	4,592,0004.6M	$24M	5.23%	ADD 30%
5	Nantahala Capital Management, LLC	3,584,8203.6M	$19M	4.08%	ADD 676%
6	STATE STREET CORP	3,516,6513.5M	$19M	4.00%	ADD 9%
7	VANGUARD CAPITAL MANAGEMENT LLC	3,322,7703.3M	$18M	3.78%	NEW†
8	Stonepine Capital Management, LLC	3,302,3003.3M	$18M	3.76%	ADD 21%
9	Foresite Capital Management VI LLC	3,146,6313.1M	$17M	3.58%	—
10	MILLENNIUM MANAGEMENT LLC	2,411,9652.4M	$13M	2.74%	ADD 334%
11	CITADEL ADVISORS LLC	2,308,6692.3M	$12M	2.63%	—
12	MORGAN STANLEY	2,247,2732.2M	$12M	2.56%	ADD 20%
13	Rosalind Advisors, Inc.	2,138,4752.1M	$11M	2.43%	ADD 20%
14	Alyeska Investment Group, L.P.	2,050,0002.0M	$11M	2.33%	NEW†
15	AIGH Capital Management LLC	2,000,0002.0M	$11M	2.28%	NEW†
16	GEODE CAPITAL MANAGEMENT, LLC	1,717,5571.7M	$9M	1.95%	ADD 23%
17	J. Goldman & Co LP	1,680,7521.7M	$9M	1.91%	ADD 77%
18	GOLDMAN SACHS GROUP INC	1,484,0031.5M	$8M	1.69%	—
19	Qube Research & Technologies Ltd	1,476,0281.5M	$8M	1.68%	ADD 479%
20	ACORN CAPITAL ADVISORS, LLC	1,469,1531.5M	$8M	1.67%	—
21	NEXTBio Capital Management LP	1,306,8001.3M	$7M	1.49%	—
22	FRANKLIN RESOURCES INC	1,105,8851.1M	$6M	1.26%	ADD 19%
23	Logos Global Management LP	1,000,0001.0M	$5M	1.14%	TRIM -41%
24	Ishara Investments LP	820,000820,000	$4M	0.93%	ADD 204%
25	Longaeva Partners L.P.	807,755807,755	$4M	0.92%	NEW
26	VANGUARD PORTFOLIO MANAGEMENT LLC	756,875756,875	$4M	0.86%	NEW
27	TWO SIGMA INVESTMENTS, LP	667,010667,010	$4M	0.76%	ADD 40%
28	Exome Asset Management LLC	636,700636,700	$3M	0.72%	ADD 58%
29	BAKER BROS. ADVISORS LP	584,757584,757	$3M	0.67%	NEW
30	JANE STREET GROUP, LLC	570,618570,618	$3M	0.65%	ADD 78%
31	Jefferies Financial Group Inc.	556,016556,016	$3M	0.63%	—
32	UBS Group AG	543,689543,689	$3M	0.62%	ADD 8%
33	NORTHERN TRUST CORP	515,786515,786	$3M	0.59%	ADD 31%
34	Pinnacle Financial Partners, Inc.	495,266495,266	$3M	0.56%	ADD 27%
35	VANGUARD FIDUCIARY TRUST CO	494,694494,694	$3M	0.56%	NEW
36	FMR LLC	473,657473,657	$3M	0.54%	ADD 19%
37	TORONTO DOMINION BANK	460,413460,413	$2M	0.52%	—
38	BANK OF AMERICA CORP /DE/	416,985416,985	$2M	0.47%	ADD 32%
39	Balyasny Asset Management L.P.	409,779409,779	$2M	0.47%	TRIM -87%
40	XTX Topco Ltd	395,834395,834	$2M	0.45%	ADD 202%
41	CANTOR FITZGERALD, L. P.	363,132363,132	$2M	0.41%	ADD 759%
42	Y-Intercept (Hong Kong) Ltd	345,571345,571	$2M	0.39%	TRIM -5%
43	SPHERA FUNDS MANAGEMENT LTD.	343,678343,678	$2M	0.39%	—
44	ALGERT GLOBAL LLC	305,246305,246	$2M	0.35%	ADD 2675%
45	Torray Investment Partners LLC	298,958298,958	$2M	0.34%	ADD 38%
46	Squarepoint Ops LLC	270,553270,553	$1M	0.31%	—
47	Palo Alto Investors LP	246,093246,093	$1M	0.28%	NEW
48	PANAGORA ASSET MANAGEMENT INC	244,103244,103	$1M	0.28%	—
49	Hennion & Walsh Asset Management, Inc.	221,323221,323	$1M	0.25%	ADD 27%
50	SG Americas Securities, LLC	215,004215,004	$1M	0.24%	TRIM -45%
51	Ikarian Capital, LLC	213,865213,865	$1M	0.24%	—
52	Nuveen, LLC	206,096206,096	$1M	0.23%	ADD 9%
53	RAYMOND JAMES FINANCIAL INC	199,003199,003	$1M	0.23%	—
54	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	196,501196,501	$1M	0.22%	ADD 22%
55	ExodusPoint Capital Management, LP	183,976183,976	$975,073	0.21%	ADD 75%
56	Bank of New York Mellon Corp	161,707161,707	$857,046	0.18%	ADD 32%
57	WELLINGTON MANAGEMENT GROUP LLP	151,240151,240	$801,572	0.17%	ADD 4%
58	Birchview Capital, LP	150,000150,000	$795,000	0.17%	—
59	PRELUDE CAPITAL MANAGEMENT, LLC	144,719144,719	$767,011	0.16%	ADD 95%
60	Seven Fleet Capital Management LP	123,400123,400	$654,020	0.14%	ADD 715%
61	Jump Financial, LLC	118,473118,473	$627,906	0.13%	NEW
62	Susquehanna Portfolio Strategies, LLC	114,891114,891	$608,922	0.13%	NEW
63	ROYAL BANK OF CANADA	110,729110,729	$587,000	0.13%	ADD 15%
64	Rafferty Asset Management, LLC	109,123109,123	$578,352	0.12%	TRIM -16%
65	Invesco Ltd.	104,049104,049	$551,460	0.12%	—
66	Knott David M Jr	104,000104,000	$551,200	0.12%	NEW
67	Quarry LP	100,000100,000	$530,000	0.11%	ADD 270%
68	ALLIANCEBERNSTEIN L.P.	67,27067,270	$519,324	0.08%	—
69	Man Group plc	96,83396,833	$513,215	0.11%	NEW
70	SUSQUEHANNA INTERNATIONAL GROUP, LLP	91,76091,760	$486,328	0.10%	TRIM -36%
71	BARCLAYS PLC	90,30090,300	$478,591	0.10%	TRIM -55%
72	Quantinno Capital Management LP	74,28574,285	$393,710	0.08%	NEW
73	RHUMBLINE ADVISERS	71,97371,973	$381,451	0.08%	ADD 19%
74	ADAR1 Capital Management, LLC	71,10071,100	$376,830	0.08%	NEW
75	BOOTHBAY FUND MANAGEMENT, LLC	68,54168,541	$363,267	0.08%	—
76	Graham Capital Management, L.P.	67,06567,065	$355,445	0.08%	ADD 186%
77	AQR CAPITAL MANAGEMENT LLC	66,06566,065	$350,143	0.08%	ADD 35%
78	DEUTSCHE BANK AG\	62,80462,804	$332,862	0.07%	ADD 38%
79	Quadrature Capital Ltd	52,09852,098	$276,119	0.06%	NEW
80	Brevan Howard Capital Management LP	51,15851,158	$270,882	0.06%	ADD 103%
81	PROFUND ADVISORS LLC	48,76148,761	$258,433	0.06%	ADD 2%
82	PRICE T ROWE ASSOCIATES INC /MD/	46,82746,827	$249,000	0.05%	ADD 72%
83	WINTON GROUP Ltd	46,20046,200	$244,860	0.05%	NEW
84	Cetera Investment Advisers	43,34643,346	$229,734	0.05%	—
85	Aquatic Capital Management LLC	42,88042,880	$227,264	0.05%	ADD 39%
86	Vanguard Global Advisers, LLC	42,70142,701	$226,315	0.05%	NEW
87	ENVESTNET ASSET MANAGEMENT INC	42,39242,392	$224,678	0.05%	—
88	HSBC HOLDINGS PLC	39,39039,390	$209,752	0.04%	NEW
89	STIFEL FINANCIAL CORP	38,89138,891	$206,127	0.04%	TRIM -2%
90	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	39,00739,007	$203,322	0.04%	ADD 21%
91	Dauntless Investment Group, LLC	36,75036,750	$194,775	0.04%	NEW
92	Arrowpoint Investment Partners (Singapore) Pte. Ltd.	36,17036,170	$191,701	0.04%	NEW
93	FOX RUN MANAGEMENT, L.L.C.	39,00439,004	$189,169	0.04%	TRIM -32%
94	MetLife Investment Management, LLC	32,95832,958	$174,677	0.04%	ADD 14%
95	CANADA PENSION PLAN INVESTMENT BOARD	32,60032,600	$172,780	0.04%	ADD 161%
96	WELLS FARGO & COMPANY/MN	30,08630,086	$159,456	0.03%	TRIM -52%
97	MIZUHO SECURITIES USA LLC	30,00030,000	$159,000	0.03%	NEW
98	LOS ANGELES CAPITAL MANAGEMENT LLC	29,52029,520	$156,456	0.03%	NEW
99	Virtus Investment Advisers, LLC	28,37428,374	$150,382	0.03%	ADD 2%
100	D. E. Shaw & Co., Inc.	26,65926,659	$141,293	0.03%	TRIM -92%

† 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.

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

RTW INVESTMENTS, LP

—

4.2M

4.3M

5.4M

6.6M

$35M

BlackRock, Inc.

2.4M

2.5M

2.8M

3.7M

4.8M

6.2M

$33M

Deep Track Capital, LP

—

5.7M

$30M

ARMISTICE CAPITAL, LLC

—

2.1M

3.5M

4.6M

$24M

Nantahala Capital Management, LLC

3.8M

2.3M

3.0M

1.3M

462K

3.6M

$19M

STATE STREET CORP

742K

812K

2.3M

2.2M

3.2M

3.5M

$19M

VANGUARD CAPITAL MANAGEMENT LLC

—

3.3M

$18M

Stonepine Capital Management, LLC

870K

613K

1.4M

2.7M

3.3M

$18M

Foresite Capital Management VI LLC

—

1.3M

2.6M

3.1M

$17M

MILLENNIUM MANAGEMENT LLC

38K

185K

53K

1.2M

555K

2.4M

$13M

CITADEL ADVISORS LLC

342K

—

185K

2.4M

2.3M

$12M

MORGAN STANLEY

812K

1.2M

1.1M

1.6M

1.9M

2.2M

$12M

Rosalind Advisors, Inc.

900K

2.6M

2.0M

1.9M

1.8M

2.1M

$11M

Alyeska Investment Group, L.P.

—

132K

—

2.0M

$11M

AIGH Capital Management LLC

2.7M

2.3M

2.0M

—

2.0M

$11M

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	155	81,384,854	92.6%	$431M
2025-Q4

Short interest has its own tab now — open SI →

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

Large holders — 13G, passive (top 5 of 19 by % of class)

Holder

% of class

Type

As of

Deep Track Capital, LP

9.99%

Passive

2025-11-14

SEC →

RTW INVESTMENTS, LP

9.9%

QII

2026-03-31

SEC →

Soleus Capital Master Fund, L.P.

7.3%

Passive

2024-12-31

SEC →

BlackRock, Inc.

QII

2025-09-30

SEC →

ARMISTICE CAPITAL, LLC

5.23%

QII

VSTM US Equity☆

Institutional ownership· 13F filers holding VSTM · 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 · VSTM

Institutional ownership· 13F filers holding VSTM · 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 · VSTM

VSTM US Equity