BOLD · Boundless Bio, Inc. · Holdings

$2.41 +0.00 (+0.00%) At close · Oct 27

Market Cap

$54.82M

22.75M

Volume · Oct 27 91.09K Avg daily vol (3M) 176.49K

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.

Use institutional holdings through the 13F API or MCP → See every holder of BOLD: 13F, 13D and 13G, insiders and funds →

The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.

Quarter:

Holders: 39

Total Value: $38,252,567

Total Shares: 15,301,031

Institutional Ownership Trend

11 quarters

Holder Concentration

Across 40 13F filers

Top Holder

17.6%

of institutional value

Top 5

70.6%

of institutional value

Top 10

86.4%

of institutional value

HHI

1,147

Broadly held

Who Holds BOLD

Last 8 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 40 filers, like-for-like change +80.3%; actively managed books +88.9%; index-like books +6.7%.

Holder type	Share	Filers	Change	New	Exited
Registered adviser	38.4%	16	+32.1%	6	5
Exempt adviser	17.7%	2	+15417.4%	1	0
Bank	0.3%	4	+104.1%	1	1
Non-US	0.0%	2	-0.6%	0	0
Holding company	21.2%	4	-2.9%	0	0
Adviser	0.0%	0	-100.0%	0	1
Insurer	0.0%	0	—	0	0
Benefit plan	0.0%	0	—	0	0
Unknown	22.4%	12	+582.4%	5	1

Style	Share	Filers	Change	New	Exited
Index-like	6.2%	7	+6.7%	1	0
Systematic-like	7.4%	7	-42.7%	1	1
Concentrated	34.8%	5	+51705.9%	4	1
Diversified active	51.6%	21	+40.8%	7	6
Not measured	0.0%	0	—	0	0
Unknown	0.0%	0	—	0	0

Turnover	Share	Filers	Change	New	Exited
Low turnover	38.8%	13	+78.6%	3	0
Medium turnover	47.8%	13	+217.3%	6	2
High turnover	9.0%	12	-37.2%	4	5
Unknown	4.4%	2	+2.6%	0	1
Not measured	0.0%	0	—	0	0

Holding horizon	Share	Filers	Change	New	Exited
Short horizon	6.0%	7	-3.4%	2	2
Medium horizon	33.7%	6	+671.2%	3	1
Long horizon	33.6%	21	-19.9%	4	3
Unknown	26.7%	6	+821.3%	4	2
Not measured	0.0%	0	—	0	0

13F book size	Share	Filers	Change	New	Exited
Under $1B	1.9%	4	-79.6%	2	2
$1B to $10B	58.9%	15	+1776.9%	8	2
$10B to $100B	7.9%	6	+24.9%	1	2
$100B or more	31.2%	15	-14.6%	2	2
Not measured	0.0%	0	—	0	0

Client base	Share	Filers	Change	New	Exited
Individuals and high net worth	0.1%	2	0.0%	1	0
Pooled investment vehicles	31.7%	10	+58.4%	5	5
Registered funds and BDCs	5.6%	3	+10.9%	0	0
Pension and profit sharing plans	0.0%	0	—	0	0
Insurance companies	0.0%	0	—	0	0
Governments and sovereign funds	0.0%	0	—	0	0
Diversified	0.0%	0	—	0	0
Unknown	62.7%	25	+106.5%	7	3

Private funds	Share	Filers	Change	New	Exited
Hedge funds	26.3%	12	+34.2%	5	3
Private equity funds	6.5%	1	+47.4%	1	1
Venture capital funds	17.6%	1	new	1	0
Other private funds	0.8%	1	+153.5%	0	0
Mixed private funds	0.0%	0	—	0	0
No private funds	4.8%	3	+0.9%	0	1
Real estate funds	0.0%	0	—	0	0
Private funds, type not stated	0.0%	0	—	0	0
Securitized asset funds	0.0%	0	—	0	0
Unknown	43.9%	22	+66.9%	6	3

Location	Share	Filers	Change	New	Exited
United States	99.0%	33	+97.8%	12	6
Outside the US	1.0%	7	-81.5%	1	2

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Excluded 1 holder with no observed 2026-06-30 13F.

Conviction and Crowding

40 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders

0.000% of filers hold it in their top 10

Mar 31, 2026: 0

Holders above 5%

median weight 0.001%

Mar 31, 2026: 0

Crowding

36.2%

of shares outstanding, 89th percentile

Mar 31, 2026: 17.5%

Private-fund advisers

34.9%

of shares outstanding

Institutional ownership

68.1%

76.9% of the estimated free float

Top 10 holders

86.4%

of 13F shares, Herfindahl 0.115

Active holders

+88.9%

like-for-like share change of active filers

5% stakes on record

1 13D, 5 13G (2 institutional, 2 passive, 1 exempt)

How long holders have held it value-weighted 3.9 quarters

Under 1 year 63.3% 1 to 3 years 36.7% 3 years or more 0.000% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost

$1.55

estimated per share

Mar 31, 2026: $1.67

Quarter-end price

$2.50

implied by 13F values

Estimated gain or loss

+61.7%

price against the estimated cost

Estimated at a loss

1.37%

of costed 13F value

Estimated cost covers 69.6% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies BOLD's active holders also own, quarter ended Jun 30, 2026

#	Company	Shared holders	Similarity
1	ANL Adlai Nortye Group Ltd.	5	0.434
2	CLYM Climb Bio, Inc.	4	0.347
3	FTH Faeth Therapeutics, Inc.	4	0.330
4	CABA Cabaletta Bio, Inc.	3	0.314
5	RACC Research Alliance Corp III	3	0.293
6	PLRX Pliant Therapeutics, Inc.	3	0.267
7	OVID Ovid Therapeutics Inc.	3	0.260
8	VIR Vir Biotechnology, Inc.	3	0.254
9	HLXC Helix Acquisition Corp. III	3	0.247
10	OKUR OnKure Therapeutics, Inc.	3	0.242

Shareholder Targets

13F filers that own its peers but not BOLD, quarter ended Jun 30, 2026

Found through its holder-overlap peers: ANL, CLYM, FTH, CABA, RACC, PLRX, OVID, VIR, HLXC, OKUR, DMRA, IMVT, SYRE, AMLX, CRNX, SVRA, BHVN, ROIV, ERAS, PCVX. 904 filers in all.

#	Filer	In peers	Of book	Largest peers
1	VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser, Diversified active	$1,935,441,583 16 held	0.090%	ROIV, PCVX, SYRE
2	Jupiter Topco LLC Unknown, Diversified active	$1,869,725,098 13 held	0.760%	PCVX, SYRE, CRNX
3	T. Rowe Price Investment Management, Inc. Adviser, Diversified active	$1,317,341,502 6 held	0.870%	PCVX, ERAS, IMVT
4	GOLDMAN SACHS GROUP INC Holding company, Index-like	$1,182,202,118 15 held	0.130%	ROIV, SYRE, PCVX
5	PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser, Diversified active	$1,094,517,028 15 held	0.110%	SYRE, CRNX, PCVX
6	FARALLON CAPITAL MANAGEMENT LLC Registered adviser, Diversified active	$1,066,434,207 3 held	6.29%	ROIV, CRNX, IMVT
7	RA CAPITAL MANAGEMENT, L.P. Registered adviser, Concentrated	$954,629,432 7 held	8.41%	PCVX, CLYM, DMRA
8	PERCEPTIVE ADVISORS LLC Registered adviser, Diversified active	$932,080,679 7 held	15.0%	SYRE, ROIV, AMLX
9	RTW INVESTMENTS, LP Registered adviser, Diversified active	$865,385,918 4 held	7.39%	SYRE, ERAS, IMVT
10	QVT Financial LP Registered adviser, Concentrated	$844,830,173 2 held	55.3%	ROIV, BHVN

Fund Ownership of BOLD by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 3.43% of shares outstanding.

Fund type	Of shares outstanding	Change	Shares	Funds
Index funds	0.55%	+0.16 pp	124,743	4
Index ETFs	2.88%	+0.07 pp	656,043	3
Active ETFs	0.00%	0.00 pp	0	0
Active funds	6.43%	+0.20 pp	1,461,673	6
Unclassified	0.00%	0.00 pp	0	0
All registered funds	9.86%	+0.43 pp	2,242,459	13

How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Holder type: Registered adviser 15 Exempt adviser 2 Bank 4 Non-US 2 Holding company 4 Unknown 12

Showing 39 of 39

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

ARCH Venture Management, LLC

$6,735,237

17.61%

2,694,095

FMR LLC

$6,452,637

16.87%

2,581,055

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	1,332,980	$3,332,450	51.6%	Defined
FIDELITY MANAGEMENT TRUST CO	1,243,083	$3,107,707	48.2%	Defined
Fidelity Institutional Asset Management Trust Co	4,992	$12,480	0.2%	Defined

TANG CAPITAL MANAGEMENT LLC

$6,399,687

16.73%

2,559,875

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

Manager	Shares	Value (USD)	% of position	Discretion
TANG KEVIN	2,559,875	$6,399,687	100.0%	Other

ADAR1 Capital Management, LLC

$4,920,540

12.86%

1,968,216

Cormorant Asset Management, LP

$2,500,000

6.54%

1,000,000

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

Manager	Shares	Value (USD)	% of position	Discretion
Chen Bihua	1,000,000	$2,500,000	100.0%	Defined

VANGUARD CAPITAL MANAGEMENT LLC

$1,537,307

4.02%

614,923

WELLINGTON MANAGEMENT GROUP LLP

$1,390,582

3.64%

556,233

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	556,233	$1,390,582	100.0%	Defined

MILLENNIUM MANAGEMENT LLC

$1,196,597

3.13%

478,639

RENAISSANCE TECHNOLOGIES LLC

$1,178,925

3.08%

471,570

Alyeska Investment Group, L.P.

$750,000

1.96%

300,000

Affinity Asset Advisors, LLC

$625,000

1.63%

250,000

RBF Capital, LLC

$500,000

1.31%

200,000

Ensign Peak Advisors, Inc

$399,587

1.04%

159,835

Stonepine Capital Management, LLC

$386,487

1.01%

154,595

ACADIAN ASSET MANAGEMENT LLC

$366,892

0.96%

146,757

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

Manager	Shares	Value (USD)	% of position	Discretion
Acadian Inc	146,757	$366,892	100.0%	Defined

CITADEL ADVISORS LLC

$362,622

0.95%

145,049

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	145,049	$362,622	100.0%	Defined

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$320,000

0.84%

128,000

GEODE CAPITAL MANAGEMENT, LLC

$291,839

0.76%

116,736

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	20,683	$51,707	17.7%	Defined
Held directly	96,053	$240,132	82.3%	Defined

HRT FINANCIAL LP

$290,720

0.76%

116,288

BlackRock, Inc.

$221,236

0.58%

88,495

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

Manager	Shares	Value (USD)	% of position	Discretion
BlackRock Investment Management, LLC	4,089	$10,222	4.6%	Sole
BlackRock Fund Advisors	58,851	$147,127	66.5%	Sole
BlackRock Institutional Trust Company, N.A.	25,555	$63,887	28.9%	Sole

PRELUDE CAPITAL MANAGEMENT, LLC

$209,995

0.55%

83,998

Rangeley Capital, LLC

$185,000

0.48%

74,000

GSA CAPITAL PARTNERS LLP

$180,882

0.47%

72,353

VANGUARD FIDUCIARY TRUST CO

$162,840

0.43%

65,136

JANE STREET GROUP, LLC

$160,807

0.42%

64,323

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	45,870	$114,675	71.3%	Defined
Jane Street Global Trading, LLC	18,453	$46,132	28.7%	Defined

SUPERSTRING CAPITAL MANAGEMENT LP

$138,390

0.36%

55,356

NORTHERN TRUST CORP

$87,060

0.23%

34,824

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	34,824	$87,060	100.0%	Defined

XTX Topco Ltd

$83,402

0.22%

33,361

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	33,361	$83,402	100.0%	Defined

Qube Research & Technologies Ltd

$50,517

0.13%

20,207

China Universal Asset Management Co., Ltd.

$42,250

0.11%

16,900

STATE STREET CORP

$39,905

0.10%

15,962

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 TRUST COMPANY	15,962	$39,905	100.0%	Defined

MORGAN STANLEY

$32,500

0.08%

13,000

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

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY SMITH BARNEY LLC	13,000	$32,500	100.0%	Defined

Caitong International Asset Management Co., Ltd

$26,107

0.07%

10,443

Pure Financial Advisors, LLC

$25,250

0.07%

10,100

Tower Research Capital LLC (TRC)

$870

0.00%

348

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)	348	$870	100.0%	Defined

JPMORGAN CHASE & CO

$447

0.00%

179

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

Manager	Shares	Value (USD)	% of position	Discretion
J.P. Morgan Securities LLC	10	$25	5.6%	Defined
J.P. Morgan Securities plc	169	$422	94.4%	Defined

BNP PARIBAS ARBITRAGE, SA

$440

0.00%

176

SBI Securities Co., Ltd.

0.00%

UBS Group AG

0.00%

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

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	2	$5	100.0%	Defined

Key facts CIK 1782303 CUSIP 10170A100 13F (30d) 1 filings 1 filers Visit website Investor relations