STRO · Sutro Biopharma, Inc.

$21.04 -0.12 (-0.57%) At close · Aug 21

Market Cap

$348.87M

16.58M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Quarter:

Holders: 97

Total Value: $547,865,947

Total Shares: 16,501,988

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 97 13F filers · Δ vs Mar 31, 2026

Top Holder

7.9%

−0.8 pts

Top 5

35.8%

+0.8 pts

Top 10

57.7%

−1.9 pts

HHI

422

Broadly held−35

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +19

Institutional value: +52.2%

Shares held: +14.2%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega BlackRock, Inc.	+889,971	1,122,655
Mid PERCEPTIVE ADVISORS LLC	+589,539	1,304,846
Mega STATE STREET CORP	+253,861	305,979
Large Balyasny Asset Management L.P.	+245,370	711,162
Mega GEODE CAPITAL MANAGEMENT, LLC	+218,306	389,692

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Large Point72 Asset Management, L.P.	−454,284	237,827
Mega UBS Group AG	−184,359	208,512
Mid EVENTIDE ASSET MANAGEMENT, LLC	−130,045	585,262
Mid ADAR1 Capital Management, LLC	−120,427	404,014
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP	−90,976	30,526

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mega AMERIPRISE FINANCIAL INC	244,669	$8,123,010
Mega VANGUARD PORTFOLIO MANAGEMENT LLC	197,562	$6,559,058
Mega Nuveen, LLC	167,997	$5,577,500
Mega JPMORGAN CHASE & CO	159,627	$5,299,615
Small Seven Fleet Capital Management LP	159,118	$5,282,717

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Large RA CAPITAL MANAGEMENT, L.P.	715,307	$17,818,297
Large ADAGE CAPITAL PARTNERS GP, L.L.C.	200,000	$4,982,000
Mid Opaleye Management Inc.	190,671	$4,749,614
Mid Eversept Partners, LP	73,161	$1,822,440
Mid Burkehill Global Management, LP	71,530	$1,781,812

Filter: New 39 Increased 24 Reduced 18 Sold out 20 Unchanged 16

Showing 99 of 99

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

PERCEPTIVE ADVISORS LLC

$43,320,887

7.91%

1,304,846

BVF INC/IL

$41,559,361

7.59%

1,251,788

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BVF PARTNERS L P/IL	1,251,788	$41,559,361	100.0%	Defined

Affinity Asset Advisors, LLC

$38,926,568

7.11%

1,172,487

BlackRock, Inc.

$37,272,143

6.80%

1,122,655

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	17,930	$595,276	1.6%	Sole
BlackRock Investment Management, LLC	46,660	$1,549,112	4.2%	Sole
BLACKROCK ADVISORS LLC	32,862	$1,091,018	2.9%	Sole
BlackRock Fund Advisors	556,164	$18,464,644	49.5%	Sole
BlackRock Institutional Trust Company, N.A.	438,001	$14,541,633	39.0%	Sole
BlackRock Investment Management (UK) Ltd.	244	$8,100	0.0%	Sole
BlackRock Asset Management Ireland Ltd	30,715	$1,019,738	2.7%	Sole
Aperio Group, LLC	79	$2,622	0.0%	Sole

SAMSARA BIOCAPITAL, LLC

$35,287,350

6.44%

1,062,872

Kynam Capital Management, LP

$28,968,925

5.29%

872,558

ORBIMED ADVISORS LLC

$24,698,940

4.51%

743,944

Balyasny Asset Management L.P.

$23,610,578

4.31%

711,162

VANGUARD CAPITAL MANAGEMENT LLC

$23,048,070

4.21%

694,219

EVENTIDE ASSET MANAGEMENT, LLC

$19,430,698

3.55%

585,262

Velan Capital Investment Management LP

$17,003,712

3.10%

512,160

Woodline Partners LP

$15,206,562

2.78%

458,029

ADAR1 Capital Management, LLC

$13,413,264

2.45%

404,014

GEODE CAPITAL MANAGEMENT, LLC

$12,937,774

2.36%

389,692

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	57,635	$1,913,482	14.8%	Defined
Held directly	332,057	$11,024,292	85.2%	Defined

ACADIAN ASSET MANAGEMENT LLC

$12,411,454

2.27%

373,839

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Acadian Inc	373,839	$12,411,454	100.0%	Defined

MILLENNIUM MANAGEMENT LLC

$12,150,270

2.22%

365,972

STATE STREET CORP

$10,158,502

1.85%

305,979

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS EUROPE LIMITED joint	305,979	$10,158,502	100.0%	Defined

Merck & Co., Inc.

$9,042,053

1.65%

272,351

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MERCK SHARP & DOHME LLC	272,351	$9,042,053	100.0%	Defined

ACUTA CAPITAL PARTNERS, LLC

$8,972,333

1.64%

270,251

AMERIPRISE FINANCIAL INC

$8,123,010

1.48%

244,669

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Columbia Management Investment Advisers, LLC	244,669	$8,123,010	100.0%	Defined

Point72 Asset Management, L.P.

$7,895,856

1.44%

237,827

KVP Capital Advisors, LP

$7,522,290

1.37%

226,575

UBS Group AG

$6,922,597

1.26%

208,512

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	162,869	$5,407,250	78.1%	Defined
UBS Europe SE	45,643	$1,515,347	21.9%	Defined

TWO SIGMA INVESTMENTS, LP

$6,696,041

1.22%

201,688

VANGUARD PORTFOLIO MANAGEMENT LLC

$6,559,058

1.20%

197,562

MARSHALL WACE, LLP

$5,818,166

1.06%

175,246

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	175,246	$5,818,166	100.0%	Other

Nuveen, LLC

$5,577,500

1.02%

167,997

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Nuveen Asset Management, LLC joint	3,971	$131,837	2.4%	Defined
TEACHERS ADVISORS, LLC joint	164,026	$5,445,663	97.6%	Defined

JPMORGAN CHASE & CO

$5,299,615

0.97%

159,627

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	18,743	$622,267	11.7%	Defined
J.P. Morgan Investment Management Inc.	140,884	$4,677,348	88.3%	Defined

Seven Fleet Capital Management LP

$5,282,717

0.96%

159,118

GOLDMAN SACHS GROUP INC

$4,953,970

0.90%

149,216

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	29,392	$975,814	19.7%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	113,044	$3,753,060	75.8%	Defined
Goldman Sachs Trust Company, N.A. joint	6,780	$225,096	4.5%	Other

NORTHERN TRUST CORP

$4,180,974

0.76%

125,933

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	123,430	$4,097,875	98.0%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	2,503	$83,099	2.0%	Other

Qube Research & Technologies Ltd

$3,539,452

0.65%

106,610

VANGUARD FIDUCIARY TRUST CO

$3,460,502

0.63%

104,232

CITADEL ADVISORS LLC

$3,385,237

0.62%

101,965

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	1	$33	0.0%	Defined
Held directly	101,964	$3,385,204	100.0%	Defined

MACKENZIE FINANCIAL CORP

$3,146,264

0.57%

94,767

RENAISSANCE TECHNOLOGIES LLC

$2,865,956

0.52%

86,324

Invesco Ltd.

$1,902,525

0.35%

57,305

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Invesco Advisers, Inc. joint	2,011	$66,765	3.5%	Defined
Invesco Trust Co joint	6,359	$211,118	11.1%	Defined
Invesco Capital Management LLC	48,935	$1,624,642	85.4%	Defined

Y-Intercept (Hong Kong) Ltd

$1,855,182

0.34%

55,879

Squarepoint Ops LLC

$1,843,894

0.34%

55,539

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	55,539	$1,843,894	100.0%	Defined

XTX Topco Ltd

$1,732,010

0.32%

52,169

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	52,169	$1,732,010	100.0%	Defined

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$1,636,826

0.30%

49,302

Sigma Planning Corp

$1,494,664

0.27%

45,020

Bank of New York Mellon Corp

$1,373,450

0.25%

41,369

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	13,088	$434,521	31.6%	Defined
The Bank of New York Mellon	28,280	$938,896	68.4%	Defined
Held directly	1	$33	0.0%	Defined

BARCLAYS PLC

$1,226,872

0.22%

36,954

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	2,537	$84,228	6.9%	Defined
BARCLAYS CAPITAL INC.	34,417	$1,142,644	93.1%	Defined

BANK OF AMERICA CORP /DE/

$1,199,847

0.22%

36,140

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	26,021	$863,897	72.0%	Defined
BOFA SECURITIES, INC.	10,119	$335,950	28.0%	Defined

Fisher Asset Management, LLC

$1,171,794

0.21%

35,295

Elmind Capital, LP

$1,063,628

0.19%

32,037

D. E. Shaw & Co., Inc.

$1,000,249

0.18%

30,128

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	30,128	$1,000,249	100.0%	Defined

Trexquant Investment LP

$917,515

0.17%

27,636

BNP PARIBAS ARBITRAGE, SA

$909,115

0.17%

27,383

RHUMBLINE ADVISERS

$684,849

0.13%

20,628

GSA CAPITAL PARTNERS LLP

$655,666

0.12%

19,749

SEI INVESTMENTS CO

$544,048

0.10%

16,387

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SEI TRUST CO	16,387	$544,048	100.0%	Sole

Informed Momentum Co LLC

$538,902

0.10%

16,232

DEUTSCHE BANK AG\

$516,691

0.09%

15,563

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
DWS Investments UK Ltd	15,563	$516,691	100.0%	Defined

RBF Capital, LLC

$507,030

0.09%

15,272

PRICE T ROWE ASSOCIATES INC /MD/

$451,419

0.08%

13,597

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
T. Rowe Price International Ltd	13,099	$434,886	96.3%	Defined
Held directly	498	$16,533	3.7%	Sole

WELLS FARGO & COMPANY/MN

$449,660

0.08%

13,544

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO BANK N A	13,544	$449,660	100.0%	Defined

MORGAN STANLEY

$410,217

0.07%

12,356

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	18	$597	0.1%	Defined
MORGAN STANLEY & CO. LLC	5,478	$181,869	44.3%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	6,756	$224,299	54.7%	Defined
MORGAN STANLEY SMITH BARNEY LLC	62	$2,058	0.5%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	42	$1,394	0.3%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$368,520

0.07%

11,100

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	11,100	$368,520	100.0%	Other

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$365,200

0.07%

11,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	11,000	$365,200	100.0%	Other

WELLINGTON MANAGEMENT GROUP LLP

$358,560

0.07%

10,800

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Wellington Management Company LLP	3,600	$119,520	33.3%	Defined
Wellington Trust Company, NA joint	7,200	$239,040	66.7%	Defined

MetLife Investment Management, LLC

$312,113

0.06%

9,401

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
METLIFE INC	9,401	$312,113	100.0%	Defined

Walleye Capital LLC

$308,959

0.06%

9,306

Integrated Quantitative Investments LLC

$296,774

0.05%

8,939

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$279,743

0.05%

8,426

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	8,426	$279,743	100.0%	Other

Lighthouse Investment Partners, LLC

$277,817

0.05%

8,368

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
North Rock Capital Management, LLC	8,368	$277,817	100.0%	Defined

CITIGROUP INC

$247,539

0.05%

7,456

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	7,456	$247,539	100.0%	Defined

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$242,791

0.04%

7,313

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Global X Management CO LLC joint	7,313	$242,791	100.0%	Defined

ALLIANCEBERNSTEIN L.P.

$242,360

0.04%

7,300

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Equitable Holdings, Inc.	7,300	$242,360	100.0%	Defined

STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM

$232,433

0.04%

7,001

Persistent Asset Partners Ltd

$218,090

0.04%

6,569

Verdad Advisers, LP

$212,480

0.04%

6,400

HSBC HOLDINGS PLC

$206,968

0.04%

6,234

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
HSBC BANK PLC	6,234	$206,968	100.0%	Defined

NEW YORK STATE COMMON RETIREMENT FUND

$185,920

0.03%

5,600

Vanguard Global Advisers, LLC

$180,774

0.03%

5,445

Police & Firemen's Retirement System of New Jersey

$156,172

0.03%

4,704

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Capital	4,704	$156,172	100.0%	Defined

Legal & General Group Plc

$114,937

0.02%

3,462

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Legal & General Investment Management America Inc	1,548	$51,393	44.7%	Defined
Legal & General Investment Management Ltd	1,914	$63,544	55.3%	Defined

State of Wyoming

$53,717

0.01%

1,618

Ameritas Investment Partners, Inc.

$48,073

0.01%

1,448

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
EATON VANCE MANAGEMENT	1,448	$48,073	100.0%	Other

FMR LLC

$44,454

0.01%

1,339

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	1,337	$44,388	99.9%	Defined
STRATEGIC ADVISERS LLC	2	$66	0.1%	Defined

Russell Investments Group, Ltd.

$42,330

0.01%

1,275

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Russell Investment Management, LLC	1,275	$42,330	100.0%	Defined

FNY Investment Advisers, LLC

$33,200

0.01%

1,000

Tower Research Capital LLC (TRC)

$28,751

0.01%

866

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	866	$28,751	100.0%	Defined

ROYAL BANK OF CANADA

$22,808

0.00%

687

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	687	$22,808	100.0%	Defined

Owl Creek Wealth Partners LLC

$16,301

0.00%

491

Sterling Capital Management LLC

$9,329

0.00%

281

Quantbot Technologies LP

$6,673

0.00%

201

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Manager 1	201	$6,673	100.0%	Sole

Physician Wealth Advisors, Inc.

$6,042

0.00%

182

OSAIC HOLDINGS, INC.

$3,320

0.00%

100

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	100	$3,320	100.0%	Defined

PNC FINANCIAL SERVICES GROUP, INC.

$2,058

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PNC Bank, National Association	62	$2,058	100.0%	Defined

Parallel Advisors, LLC

$1,560

0.00%

Avion Wealth

$1,527

0.00%

NISA INVESTMENT ADVISORS, LLC

$1,460

0.00%

HighMark Wealth Management LLC

$763

0.00%

Arax Advisory Partners

$531

0.00%

Steward Partners Investment Advisory, LLC

$66

0.00%

FIFTH THIRD BANCORP

$66

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fifth Third Bank, National Association	2	$66	100.0%	Defined

Optiver Holding B.V.

$66

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Optiver VOF	2	$66	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	22,133	$551,333	79.7%	Defined
Jane Street Global Trading, LLC	5,627	$140,168	20.3%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Brevan Howard US Investment Management, LP	18,791	$468,083	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Hudson Bay Capital UK LLP	14,768	$367,870	100.0%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jump Trading Holdings, LLC joint	1,185	$29,518	9.6%	Defined
Leap GP LLC joint	11,200	$278,992	90.4%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Arax Advisory Partners	15	$373	0.2%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	49	$1,220	0.6%	Other
Stokes Family Office, LLC	6	$149	0.1%	Other
Held directly	8,535	$212,606	99.2%	Defined

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Institutional Asset Management Trust Co	15	$373	100.0%	Sole

Key facts CIK 1382101 CUSIP 869367201 13F (30d) 96 filings 93 filers Visit website Investor relations