ZBIO · Zenas BioPharma, Inc.

$32.31 -0.01 (-0.03%)

Russell 2000 member Rebalance outlook locked

Market Cap

$2.06B

65.18M

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: 147

Total Value: $1,562,953,779

Total Shares: 61,582,129

Showing 1–100 of 149 holdings by value · page 1 of 2

Institutional Ownership Trend

8 quarters

Holder Concentration

Across 147 13F filers · Δ vs Mar 31, 2026

Top Holder

15.4%

−0.2 pts

Top 5

41.6%

−1.8 pts

Top 10

61.6%

−2.0 pts

HHI

552

Broadly held−19

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +6

Institutional value: +37.6%

Shares held: +6.0%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega PRICE T ROWE ASSOCIATES INC /MD/	+869,662	1,226,928
Mega BANK OF AMERICA CORP /DE/	+842,812	1,231,159
Mega BlackRock, Inc.	+648,677	2,686,225
Mega STATE STREET CORP	+584,177	2,055,100
Mega TWO SIGMA INVESTMENTS, LP	+540,094	815,150

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Small SILVERARC CAPITAL MANAGEMENT, LLC	−626,146	509,789
Mega UBS Group AG	−189,316	178,089
Large MARSHALL WACE, LLP	−178,486	323,442
Large Polar Capital Holdings Plc	−135,672	2,412,772
Small Sio Capital Management, LLC	−123,173	208,557

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Large Verition Fund Management LLC	72,988	$1,852,435
Mid CSM Advisors, LLC	67,622	$1,716,246
Large LOS ANGELES CAPITAL MANAGEMENT LLC	48,465	$1,230,041
Mid BOOTHBAY FUND MANAGEMENT, LLC	33,280	$844,646
Small DCF Advisers, LLC	28,184	$715,309

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Small GREAT POINT PARTNERS LLC	524,066	$10,245,490
Large Jefferies Financial Group Inc.	219,947	$4,299,963
Large SEB Asset Management AB	163,860	$3,203,463
Micro Monashee Investment Management LLC	150,000	$2,932,500
Small Maven Securities LTD	150,000	$2,932,500

Filter: New 29 Increased 62 Reduced 41 Sold out 23 Unchanged 15

Showing 100 of 149

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

FMR LLC

$241,280,070

15.44%

9,506,701

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	7,469,422	$189,573,930	78.6%	Defined
Fidelity Institutional Asset Management Trust Co	816,002	$20,710,130	8.6%	Defined
FIAM LLC	1,221,277	$30,996,010	12.8%	Defined

SR One Capital Management, LP

$127,860,734

8.18%

5,037,854

NEA Management Company, LLC

$102,109,298

6.53%

4,023,219

ENAVATE SCIENCES GP, LLC

$99,468,255

6.36%

3,919,159

FEDERATED HERMES, INC.

$79,104,510

5.06%

3,116,805

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

Manager	Shares	Value (USD)	% of position	Discretion
FEDERATED GLOBAL INVESTMENT MANAGEMENT CORP	3,116,805	$79,104,510	100.0%	Defined

BlackRock, Inc.

$68,176,387

4.36%

2,686,225

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	22,867	$580,364	0.9%	Sole
BlackRock Investment Management, LLC	84,641	$2,148,188	3.2%	Sole
BLACKROCK ADVISORS LLC	64,372	$1,633,761	2.4%	Sole
BlackRock Fund Advisors	1,426,774	$36,211,524	53.1%	Sole
BlackRock Institutional Trust Company, N.A.	983,209	$24,953,844	36.6%	Sole
BlackRock Fund Managers Ltd.	6,538	$165,934	0.2%	Sole
BlackRock Asset Management Ireland Ltd	67,332	$1,708,886	2.5%	Sole
Aperio Group, LLC	30,492	$773,886	1.1%	Sole

Capital International Investors

$63,523,906

4.06%

2,502,912

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

Manager	Shares	Value (USD)	% of position	Discretion
CAPITAL GROUP COMPANIES INC joint	2,502,912	$63,523,906	100.0%	Defined

Polar Capital Holdings Plc

$61,236,153

3.92%

2,412,772

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

Manager	Shares	Value (USD)	% of position	Discretion
Polar Capital LLP	2,412,772	$61,236,153	100.0%	Defined

Royalty Pharma Sub-Manager, LLC

$60,611,247

3.88%

2,388,150

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

Manager	Shares	Value (USD)	% of position	Discretion
Royalty Pharma Manager, LLC joint	2,388,150	$60,611,247	100.0%	Defined

Fairmount Funds Management LLC

$59,872,054

3.83%

2,359,025

STATE STREET CORP

$52,158,438

3.34%

2,055,100

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	2,055,100	$52,158,438	100.0%	Defined

NVP ASSOCIATES, LLC

$46,660,673

2.99%

1,838,482

WELLINGTON MANAGEMENT GROUP LLP

$40,451,123

2.59%

1,593,819

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	1,262,654	$32,046,158	79.2%	Defined
Wellington Management Hong Kong Ltd	1,265	$32,105	0.1%	Defined
Wellington Management Singapore Pte. Ltd.	35,996	$913,578	2.3%	Defined
Wellington Management International Ltd	16,461	$417,780	1.0%	Defined
Wellington Trust Company, NA joint	270,722	$6,870,924	17.0%	Defined
Wellington Management Australia Pty Ltd	6,721	$170,578	0.4%	Defined

VANGUARD CAPITAL MANAGEMENT LLC

$34,386,448

2.20%

1,354,864

BANK OF AMERICA CORP /DE/

$31,246,815

2.00%

1,231,159

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	705,832	$17,914,016	57.3%	Defined
BOFA SECURITIES, INC.	525,327	$13,332,799	42.7%	Defined

PRICE T ROWE ASSOCIATES INC /MD/

$31,139,432

1.99%

1,226,928

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	42,285	$1,073,193	3.4%	Defined
Held directly	1,184,643	$30,066,239	96.6%	Sole

ALLIANCEBERNSTEIN L.P.

$28,003,987

1.79%

1,103,388

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

Manager	Shares	Value (USD)	% of position	Discretion
Equitable Holdings, Inc.	1,103,388	$28,003,987	100.0%	Defined

GEODE CAPITAL MANAGEMENT, LLC

$22,401,758

1.43%

882,654

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	128,003	$3,248,716	14.5%	Defined
Held directly	754,651	$19,153,042	85.5%	Defined

TWO SIGMA INVESTMENTS, LP

$20,688,507

1.32%

815,150

EcoR1 Capital, LLC

$20,037,510

1.28%

789,500

MILLENNIUM MANAGEMENT LLC

$16,762,728

1.07%

660,470

Woodline Partners LP

$14,987,879

0.96%

590,539

Balyasny Asset Management L.P.

$14,637,077

0.94%

576,717

ArrowMark Colorado Holdings LLC

$14,550,810

0.93%

573,318

SILVERARC CAPITAL MANAGEMENT, LLC

$12,938,444

0.83%

509,789

Rock Springs Capital Management LP

$12,742,714

0.82%

502,077

Pivotal bioVenture Partners Investment Advisor LLC

$12,455,641

0.80%

490,766

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

Manager	Shares	Value (USD)	% of position	Discretion
Pivotal bioVenture Partners Fund I U.G.P. Ltd	490,766	$12,455,641	100.0%	Defined

NEXTBio Capital Management LP

$10,830,559

0.69%

426,736

Vestal Point Capital, LP

$9,263,700

0.59%

365,000

MARSHALL WACE, LLP

$8,208,957

0.53%

323,442

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	323,442	$8,208,957	100.0%	Other

JENNISON ASSOCIATES LLC

$7,970,563

0.51%

314,049

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

Manager	Shares	Value (USD)	% of position	Discretion
Prudential Financial Inc	314,049	$7,970,563	100.0%	Defined

VANGUARD PORTFOLIO MANAGEMENT LLC

$7,737,600

0.50%

304,870

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$7,666,917

0.49%

302,085

NORTHERN TRUST CORP

$7,135,329

0.46%

281,140

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	268,710	$6,819,858	95.6%	Defined
NORTHERN TRUST GLOBAL INVESTMENTS LTD	7,954	$201,871	2.8%	Defined
DWS INVESTMENT MANAGEMENT AMERICAS, INC joint	4,476	$113,600	1.6%	Other

GOLDMAN SACHS GROUP INC

$6,882,116

0.44%

271,163

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	150,309	$3,814,842	55.4%	Defined
GOLDMAN SACHS ASSET MANAGEMENT, L.P.	120,854	$3,067,274	44.6%	Defined

VANGUARD FIDUCIARY TRUST CO

$6,462,331

0.41%

254,623

SPHERA FUNDS MANAGEMENT LTD.

$5,858,566

0.37%

230,834

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

Manager	Shares	Value (USD)	% of position	Discretion
Sphera Global Healthcare Management LP joint	230,834	$5,858,566	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$5,740,956

0.37%

226,200

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

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	226,200	$5,740,956	100.0%	Other

iA Global Asset Management Inc.

$5,459,999

0.35%

215,130

Walleye Capital LLC

$5,305,689

0.34%

209,050

Sio Capital Management, LLC

$5,293,176

0.34%

208,557

CITADEL ADVISORS LLC

$4,968,895

0.32%

195,780

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	29,073	$737,872	14.8%	Defined
Held directly	166,707	$4,231,023	85.2%	Defined

UBS Group AG

$4,519,898

0.29%

178,089

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

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	163,524	$4,150,239	91.8%	Defined
UBS Securities LLC	14,565	$369,659	8.2%	Defined

Voleon Capital Management LP

$4,242,140

0.27%

167,145

BNP PARIBAS ARBITRAGE, SA

$3,834,562

0.25%

151,086

MORGAN STANLEY

$3,425,763

0.22%

134,979

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	365	$9,263	0.3%	Defined
MORGAN STANLEY & CO. LLC	16,892	$428,718	12.5%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	78,552	$1,993,649	58.2%	Defined
MORGAN STANLEY INVESTMENT MANAGEMENT INC	242	$6,141	0.2%	Defined
MORGAN STANLEY SMITH BARNEY LLC	36,922	$937,080	27.4%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	2,006	$50,912	1.5%	Defined

Squarepoint Ops LLC

$3,177,195

0.20%

125,185

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

Manager	Shares	Value (USD)	% of position	Discretion
Squarepoint Capital LLP	125,185	$3,177,195	100.0%	Defined

BARCLAYS PLC

$2,943,190

0.19%

115,965

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

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	112,634	$2,858,650	97.1%	Defined
BARCLAYS CAPITAL INC.	3,331	$84,540	2.9%	Defined

SEVEN GRAND MANAGERS, LLC

$2,538,000

0.16%

100,000

Birchview Capital, LP

$2,375,593

0.15%

93,601

Verition Fund Management LLC

$1,852,435

0.12%

72,988

Bank of New York Mellon Corp

$1,788,705

0.11%

70,477

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

Manager	Shares	Value (USD)	% of position	Discretion
Mellon Investments Corporation	16,493	$418,592	23.4%	Defined
The Bank of New York Mellon	49,279	$1,250,701	69.9%	Defined
BNY Mellon, NA joint	4,705	$119,412	6.7%	Defined

J. Goldman & Co LP

$1,731,728

0.11%

68,232

CSM Advisors, LLC

$1,716,246

0.11%

67,622

Nuveen, LLC

$1,691,271

0.11%

66,638

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	520	$13,197	0.8%	Defined
TEACHERS ADVISORS, LLC joint	66,118	$1,678,074	99.2%	Defined

ALPS ADVISORS INC

$1,616,071

0.10%

63,675

Swiss National Bank

$1,350,216

0.09%

53,200

Exome Asset Management LLC

$1,331,003

0.09%

52,443

Jump Financial, LLC

$1,294,938

0.08%

51,022

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

Manager	Shares	Value (USD)	% of position	Discretion
Leap GP LLC joint	51,022	$1,294,938	100.0%	Defined

CITIGROUP INC

$1,256,842

0.08%

49,521

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	49,521	$1,256,842	100.0%	Defined

LOS ANGELES CAPITAL MANAGEMENT LLC

$1,230,041

0.08%

48,465

XTX Topco Ltd

$1,016,062

0.07%

40,034

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	40,034	$1,016,062	100.0%	Defined

Burkehill Global Management, LP

$1,015,200

0.06%

40,000

JANE STREET GROUP, LLC

$989,820

0.06%

39,000

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	39,000	$989,820	100.0%	Defined

UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC

$959,109

0.06%

37,790

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

Manager	Shares	Value (USD)	% of position	Discretion
UBS Group AG	23	$583	0.1%	Defined
UBS Asset Management Switzerland AG	37,767	$958,526	99.9%	Sole

Rafferty Asset Management, LLC

$951,978

0.06%

37,509

Atom Investors LP

$942,841

0.06%

37,149

RHUMBLINE ADVISERS

$869,138

0.06%

34,245

BOOTHBAY FUND MANAGEMENT, LLC

$844,646

0.05%

33,280

AQR CAPITAL MANAGEMENT LLC

$789,315

0.05%

31,100

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

Manager	Shares	Value (USD)	% of position	Discretion
RF&L WEALTH MANAGEMENT, LLC	10	$253	0.0%	Other
Compound Planning, Inc.	4	$101	0.0%	Other
Arax Advisory Partners	94	$2,385	0.3%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	288	$7,309	0.9%	Other
Stokes Family Office, LLC	125	$3,172	0.4%	Other
Held directly	30,579	$776,095	98.3%	Defined

CITADEL ADVISORS LLC

$784,242

0.05%

30,900

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	30,900	$784,242	100.0%	Defined

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM

$747,973

0.05%

29,471

DEUTSCHE BANK AG\

$732,998

0.05%

28,881

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

Manager	Shares	Value (USD)	% of position	Discretion
DWS INVESTMENT MANAGEMENT AMERICAS, INC	821	$20,836	2.8%	Defined
DWS Investments UK Ltd	28,060	$712,162	97.2%	Defined

DCF Advisers, LLC

$715,309

0.05%

28,184

STATE OF WISCONSIN INVESTMENT BOARD

$683,280

0.04%

26,922

WELLS FARGO & COMPANY/MN

$659,753

0.04%

25,995

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	25,995	$659,753	100.0%	Defined

JPMORGAN CHASE & CO

$620,412

0.04%

24,445

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.	11,813	$299,813	48.3%	Defined
J.P. Morgan Investment Management Inc.	8,188	$207,811	33.5%	Defined
J.P. Morgan Securities plc	4,444	$112,788	18.2%	Defined

VANGUARD ASSET MANAGEMENT, Ltd

$523,411

0.03%

20,623

Legal & General Group Plc

$508,182

0.03%

20,023

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	2,767	$70,226	13.8%	Defined
Legal & General Investment Management Ltd joint	17,256	$437,956	86.2%	Defined

Invesco Ltd.

$481,050

0.03%

18,954

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	4,471	$113,472	23.6%	Defined
Invesco Trust Co joint	11,282	$286,337	59.5%	Defined
Invesco Capital Management LLC	3,201	$81,241	16.9%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$479,682

0.03%

18,900

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

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	18,900	$479,682	100.0%	Other

China Universal Asset Management Co., Ltd.

$478,362

0.03%

18,848

PROFUND ADVISORS LLC

$478,108

0.03%

18,838

ALLSTATE CORP

$462,956

0.03%

18,241

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

Manager	Shares	Value (USD)	% of position	Discretion
ALLSTATE INVESTMENTS LLC	18,241	$462,956	100.0%	Sole

MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.

$442,195

0.03%

17,423

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	13,066	$331,615	75.0%	Defined
Global X Management (AUS) Ltd joint	4,357	$110,580	25.0%	Defined

Y-Intercept (Hong Kong) Ltd

$439,886

0.03%

17,332

MetLife Investment Management, LLC

$432,500

0.03%

17,041

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

Manager	Shares	Value (USD)	% of position	Discretion
METLIFE INC	17,041	$432,500	100.0%	Defined

Virtus Investment Advisers, LLC

$419,404

0.03%

16,525

Point72 Asset Management, L.P.

$409,531

0.03%

16,136

Vanguard Global Advisers, LLC

$389,126

0.02%

15,332

NORDEA INVESTMENT MANAGEMENT AB

$381,969

0.02%

15,050

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

Manager	Shares	Value (USD)	% of position	Discretion
Nordea Investment Funds S.A.	15,050	$381,969	100.0%	Defined

Brevan Howard Capital Management LP

$372,426

0.02%

14,674

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	14,674	$372,426	100.0%	Defined

Engineers Gate Manager LP

$329,432

0.02%

12,980

Russell Investments Group, Ltd.

$323,341

0.02%

12,740

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	12,740	$323,341	100.0%	Defined

Creative Planning

$297,529

0.02%

11,723

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

Manager	Shares	Value (USD)	% of position	Discretion
CREATIVE PLANNING TRUST Co LLC	365	$9,263	3.1%	Defined
Held directly	11,358	$288,266	96.9%	Sole

VARCOV Co.

$266,616

0.02%

10,505

NEW YORK STATE COMMON RETIREMENT FUND

$261,414

0.02%

10,300

MASSACHUSETTS FINANCIAL SERVICES CO /MA/

$229,765

0.01%

9,053

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

Manager	Shares	Value (USD)	% of position	Discretion
MFS Heritage Trust CO	1,524	$38,679	16.8%	Defined
Held directly	7,529	$191,086	83.2%	Sole

Scientech Research LLC

$229,130

0.01%

9,028

HRT FINANCIAL LP

$225,349

0.01%

8,879

Key facts CIK 1953926 CUSIP 98937L105 13F (30d) 136 filings 131 filers Visit website Investor relations