BOLD · Boundless Bio, Inc. · Shareholders & Ownership
Market Cap
$54.82M
Shares
22.75M
Volume · Oct 27
91.09K
Avg daily vol (3M)
176.49K
Every disclosed holder of BOLD in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns BOLD
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positionsNo chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 15,301,031 | 67.26% |
| Insiders (Forms 3, 4, 5) | 5,388,190 | 23.69% |
| 13D/G-only blocks | 4,042,058 | 17.77% |
| Remaining | 1,983,294 | -8.72% |
| Registered funds (N-PORT, not summed) | 2,221,310 | 9.76% |
Shares outstanding: 22,747,985, the issuer's latest cover-page count restated onto today's split basis.
Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of BOLD
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
|
2,694,095 | ||
| 1.1 |
|
2,699,970 | ||
| 2 |
ARCH Venture Management, LLC
13F
CIK 1274403 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,694,095 | ||
| 3 |
|
2,694,095 | ||
| 4 |
FMR LLC
13F
CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,581,055 | ||
| 4.1 |
Fidelity Growth Company Fund
Fund
S000007119 · Registered fund · Aug 31, 2026
Fidelity Mt. Vernon Street Trust, not summed
|
899,159 | ||
| 4.2 |
Fidelity Growth Company K6 Fund
Fund
S000065696 · Registered fund · Aug 31, 2026
Fidelity Mt. Vernon Street Trust, not summed
|
227,609 | ||
| 4.3 |
Fidelity Series Growth Company Fund
Fund
S000042626 · Registered fund · Aug 31, 2026
Fidelity Mt. Vernon Street Trust, not summed
|
193,116 | ||
| 4.4 |
Fidelity Extended Market Index Fund
Fund
S000006021 · Registered fund · Aug 31, 2026
Fidelity Concord Street Trust, not summed
|
67,638 | ||
| 4.5 |
Fidelity Series Total Market Index Fund
Fund
S000065248 · Registered fund · Aug 31, 2026
Fidelity Concord Street Trust, not summed
|
18,979 | ||
| 5 |
TANG CAPITAL MANAGEMENT LLC
13F
CIK 1232621 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,559,875 | ||
| 5.1 |
|
3,011,749 | ||
| 6 |
|
2,426,857 | ||
| 7 |
ADAR1 Capital Management, LLC
13F
CIK 1940272 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,968,216 | ||
| 7.1 |
ADAR1 Capital Management, LLC
13G
CIK 1940272 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
1,968,216 | ||
| 8 |
|
1,615,201 | ||
| 9 |
Cormorant Asset Management, LP
13F
CIK 1583977 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,000,000 | ||
| 10 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
614,923 | ||
| 11 |
WELLINGTON MANAGEMENT GROUP LLP
13F
CIK 902219 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
556,233 | ||
| 12 |
MILLENNIUM MANAGEMENT LLC
13F
CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
478,639 | ||
| 13 |
RENAISSANCE TECHNOLOGIES LLC
13F
CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
471,570 | ||
| 14 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
445,181 | ||
| 15 |
Alyeska Investment Group, L.P.
13F
CIK 1453072 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
300,000 | ||
| 16 |
Affinity Asset Advisors, LLC
13F
CIK 1773195 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
250,000 | ||
| 17 |
RBF Capital, LLC
13F
CIK 1134621 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
200,000 | ||
| 18 |
Ensign Peak Advisors, Inc
13F
CIK 1454984 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
159,835 | ||
| 19 |
Stonepine Capital Management, LLC
13F
CIK 1440771 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
154,595 | ||
| 20 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
152,011 | ||
| 21 |
ACADIAN ASSET MANAGEMENT LLC
13F
CIK 916542 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
146,757 | ||
| 22 |
CITADEL ADVISORS LLC
13F
CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
145,049 | ||
| 22.1 |
CITADEL ADVISORS LLC
13G
CIK 1423053 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(c), passive investor, not summed
|
145,118 | ||
| 23 |
BRIDGEWAY CAPITAL MANAGEMENT, LLC
13F
CIK 1107261 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
128,000 | ||
| 23.1 |
Ultra-Small Company Fund
Fund
S000004423 · Registered fund · Jun 30, 2026
Bridgeway Funds, Inc., not summed
|
77,500 | ||
| 23.2 |
Ultra-Small Company Market Fund
Fund
S000004424 · Registered fund · Jun 30, 2026
Bridgeway Funds, Inc., not summed
|
50,500 | ||
| 24 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
116,736 | ||
| 25 |
HRT FINANCIAL LP
13F
CIK 1475597 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
116,288 | ||
| 26 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
88,495 | ||
| 26.1 |
iShares Micro-Cap ETF
Fund
S000004439 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
58,851 | ||
| 27 |
PRELUDE CAPITAL MANAGEMENT, LLC
13F
CIK 1387508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
83,998 | ||
| 28 |
Rangeley Capital, LLC
13F
CIK 1517796 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
74,000 | ||
| 29 |
GSA CAPITAL PARTNERS LLP
13F
CIK 1362033 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
72,353 | ||
| 30 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
65,136 | ||
| 31 |
JANE STREET GROUP, LLC
13F
CIK 1595888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
64,323 | ||
| 32 |
SUPERSTRING CAPITAL MANAGEMENT LP
13F
CIK 1931118 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
55,356 | ||
| 33 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
34,824 | ||
| 34 |
XTX Topco Ltd
13F
CIK 1828301 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
33,361 | ||
| 35 |
Qube Research & Technologies Ltd
13F
CIK 1729829 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
20,207 | ||
| 36 |
VANGUARD BALANCED INDEX FUND
Fund
S000002560 · Registered fund · Jun 30, 2026
VANGUARD VALLEY FORGE FUNDS, not summed
|
17,731 | ||
| 37 |
China Universal Asset Management Co., Ltd.
13F
CIK 1906594 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
16,900 | ||
| 38 |
|
15,962 | ||
| 39 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
13,000 | ||
| 40 |
Caitong International Asset Management Co., Ltd
13F
CIK 1963355 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
10,443 | ||
| 41 |
Pure Financial Advisors, LLC
13F
CIK 1571556 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
10,100 | ||
| 42 |
1290 VT Micro Cap Portfolio
Fund
S000044688 · Registered fund · Jun 30, 2026
EQ Advisors Trust, not summed
|
4,089 | ||
| 43 |
Tower Research Capital LLC (TRC)
13F
CIK 1533421 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
348 | ||
| 44 |
JPMORGAN CHASE & CO
13F
CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
179 | ||
| 45 |
BNP PARIBAS ARBITRAGE, SA
13F
CIK 1166588 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
176 | ||
| 46 |
SBI Securities Co., Ltd.
13F
CIK 1851815 · Non-US institution · Sep 30, 2026
|
2 | ||
| 47 |
|
2 |
1 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.