Vault-13

BOUNDLESS BIO INC BOLD

COM · Common Stock · CUSIP 10170A100

Company in San Diego, United States

45 institutional holders -10 vs Q1 2025
9,787,4199.8m shares reported held*
$9.9mreported value*
11 new 7 added 19 reduced 21 sold out net sold ≈ $7.3m (-7.2m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $1.01.

Trends to Q2 2025

Institutional holders

Managers reporting a position, each quarter

0204060Q1 24: 44Q2 24: 48Q3 24: 56Q4 24: 56Q1 25: 55Q2 25: 4545Q1 24Q2 24Q3 24Q4 24Q1 25Q2 25
Numbers
QuarterHolders
Q1 202444
Q2 202448
Q3 202456
Q4 202456
Q1 202555
Q2 202545

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
40040Q2 24: 32 bought or addedQ2 24: 23 cut or sold outQ2 24Q3 24: 21 bought or addedQ3 24: 20 cut or sold outQ3 24Q4 24: 36 bought or addedQ4 24: 13 cut or sold outQ4 24Q1 25: 19 bought or addedQ1 25: 21 cut or sold outQ1 25Q2 25: 18 bought or addedQ2 25: 40 cut or sold outQ2 25
Numbers
QuarterBought or addedCut or sold out
Q2 20243223
Q3 20242120
Q4 20243613
Q1 20251921
Q2 20251840

Biggest buyers

MILLENNIUM MANAGEMENT LLC New +213,561+213.6k
RBF Capital, LLC New +200,000+200.0k
RENAISSANCE TECHNOLOGIES LLC Added +106,600+106.6k
Stonepine Capital Management, LLC New +106,175+106.2k
Y-Intercept (Hong Kong) Ltd New +55,242+55.2k
BRIDGEWAY CAPITAL MANAGEMENT, LLC New +50,500+50.5k
GOLDMAN SACHS GROUP INC Added +35,877+35.9k
HRT FINANCIAL LP New +27,509+27.5k
Qube Research & Technologies Ltd New +21,542+21.5k
Squarepoint Ops LLC New +18,399+18.4k

Biggest sellers

Nuveen, LLC Sold out -3,958,413-4.0m
RA CAPITAL MANAGEMENT, L.P. Sold out -2,180,631-2.2m
BlackRock, Inc. Reduced -563,939-563.9k
Boxer Capital Management, LLC Sold out -250,000-250.0k
PFM Health Sciences, LP Sold out -240,513-240.5k
GEODE CAPITAL MANAGEMENT, LLC Reduced -188,240-188.2k
Redmile Group, LLC Reduced -136,170-136.2k
NORTHERN TRUST CORP Reduced -107,865-107.9k
VANGUARD GROUP INC Reduced -105,173-105.2k
CHARLES SCHWAB INVESTMENT MANAGEMENT INC Sold out -40,458-40.5k

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
FMR LLC 13G · institution filed 2026-02-05 12.0% 2.7m≈ $6.7m 2026-02-05
TANG CAPITAL MANAGEMENT LLC 13G · passive investor new · filed 2026-06-29 11.3% new 2.5m≈ $6.3m 2026-06-29
Hornby Zachary 13G · passive investor new · filed 2026-08-27 9.8% new 2.4m≈ $6.1m 2026-08-27
ADAR1 Capital Management, LLC 13G · institution new · filed 2026-08-14 8.8% new 2.0m≈ $4.9m 2026-08-14

Fell to 5% or below in the last year: CITADEL ADVISORS LLC (0.6%, 2026-08-14), Nextech VI GP S.A.R.L. (0.0%, 2026-02-17)

Insider purchases and sales in Q2 2025

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
101Q3 23: 0 buyingQ3 23: 0 sellingQ4 23: 0 buyingQ4 23: 0 sellingQ4 23Q1 24: 0 buyingQ1 24: 0 sellingQ2 24: 1 buyingQ2 24: 0 sellingQ2 24Q3 24: 0 buyingQ3 24: 0 sellingQ4 24: 0 buyingQ4 24: 0 sellingQ4 24Q1 25: 0 buyingQ1 25: 0 sellingQ2 25: 0 buyingQ2 25: 0 sellingQ2 25
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q3 20230—0——
Q4 20230—0——
Q1 20240—0——
Q2 20241$3.2m0——
Q3 20240—0——
Q4 20240—0——
Q1 20250—0——
Q2 20250—0——

None reported in Q2 2025.

Holders, Q2 2025

#ManagerLocationShares Value% of their portfolioChangeShares change
1 FMR LLC 0.00% of their portfolio BOSTON, MA 3,125,1033.1m $3.2m $3.2m 0.00% Reduced -32.7k -32,669
2 Nextech Invest Ltd. 0.23% of their portfolio Zurich, V8 1,228,0691.2m $1.2m $1.2m 0.23% Unchanged
3 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 830,936830.9k $839.2k $839.2k 0.00% Unchanged
4 SECTORAL ASSET MANAGEMENT INC 0.45% of their portfolio MONTREAL, A8 678,574678.6k $685.4k $685.4k 0.45% Unchanged
5 Redmile Group, LLC 0.06% of their portfolio LARKSPUR, CA 589,034589.0k $594.9k $594.9k 0.06% Reduced -136.2k -136,170
6 WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio Boston, MA 556,233556.2k $561.8k $561.8k 0.00% Unchanged
7 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 481,267481.3k $486.1k $486.1k 0.00% Reduced -105.2k -105,173
8 Alyeska Investment Group, L.P. 0.00% of their portfolio CHICAGO, IL 300,000300.0k $303.0k $303.0k 0.00% Unchanged
9 Almitas Capital LLC 0.06% of their portfolio SANTA MONICA, CA 235,505235.5k $237.9k $237.9k 0.06% Added +1.1k +1,127
10 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 213,561213.6k $215.7k $215.7k 0.00% New
11 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 207,500207.5k $209.6k $209.6k 0.00% Reduced -107.9k -107,865
12 RBF Capital, LLC 0.01% of their portfolio RENO, NV 200,000200.0k $202.0k $202.0k 0.01% New
13 Ensign Peak Advisors, Inc 0.00% of their portfolio SALT LAKE CITY, UT 187,500187.5k $189.4k $189.4k 0.00% Unchanged
14 Sio Capital Management, LLC 0.07% of their portfolio NEW YORK, NY 163,679163.7k $165.3k $165.3k 0.07% Added +1.6k +1,621
15 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 121,000121.0k $122.2k $122.2k 0.00% Added +106.6k +106,600
16 Stonepine Capital Management, LLC 0.11% of their portfolio Bend, OR 106,175106.2k $107.2k $107.2k 0.11% New
17 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 70,30470.3k $71.0k $71.0k 0.00% Added +35.9k +35,877
18 BlackRock, Inc. 0.00% of their portfolio New York, NY 64,25864.3k $64.9k $64.9k 0.00% Reduced -563.9k -563,939
19 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 58,90358.9k $59.5k $59.5k 0.00% Reduced -188.2k -188,240
20 Y-Intercept (Hong Kong) Ltd 0.00% of their portfolio HONG KONG, K3 55,24255.2k $55.8k $55.8k 0.00% New
21 BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.00% of their portfolio HOUSTON, TX 50,50050.5k $51.0k $51.0k 0.00% New
22 XTX Topco Ltd 0.00% of their portfolio LONDON, X0 40,06440.1k $40.5k $40.5k 0.00% Added +14.1k +14,147
23 Walleye Capital LLC 0.00% of their portfolio NEW YORK, NY 39,62439.6k $40.0k $40.0k 0.00% Unchanged
24 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 32,21132.2k $32.5k $32.5k 0.00% Added +9.0k +8,968
25 HRT FINANCIAL LP 0.00% of their portfolio NEW YORK, NY 27,50927.5k $27.0k $27.0k 0.00% New
26 Qube Research & Technologies Ltd 0.00% of their portfolio LONDON, X0 21,54221.5k $21.8k $21.8k 0.00% New
27 Squarepoint Ops LLC 0.00% of their portfolio NEW YORK, NY 18,39918.4k $18.6k $18.6k 0.00% New
28 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 16,73916.7k $16.9k $16.9k 0.00% Reduced -19.4k -19,367
29 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 15,96216.0k $16.1k $16.1k 0.00% Reduced -32.2k -32,224
30 Abel Hall, LLC 0.01% of their portfolio BATON ROUGE, LA 14,39914.4k $14.5k $14.5k 0.01% New
31 ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio Boston, MA 13,75313.8k $13.0k $13.0k 0.00% Reduced -8.3k -8,334
32 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 7,7757.8k $7.9k $7.9k 0.00% Reduced -7.5k -7,519
33 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 6,0726.1k $6.1k $6.1k 0.00% Reduced -346 -346
34 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 2,5822.6k $2.6k $2.6k 0.00% Reduced -6.3k -6,283
35 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 2,5512.6k $2.6k $2.6k 0.00% Reduced -9.3k -9,319
36 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 1,9702.0k $2.0k $2.0k 0.00% Reduced -16.9k -16,923
37 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 1,1271.1k $1.1k $1.1k 0.00% Reduced -18.1k -18,125
38 RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio ST. PETERSBURG, FL 1,0001.0k $1.0k $1.0k 0.00% New
39 CWM, LLC 0.00% of their portfolio OMAHA, NE 562562 $1.0k $1.0k 0.00% Added +132 +132
40 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 194194 $0 $0 0.00% Reduced -668 -668
41 Clearstead Advisors, LLC 0.00% of their portfolio CLEVELAND, OH 2424 $25 $25 0.00% New
42 UBS Group AG 0.00% of their portfolio ZURICH, V8 1313 $13 $13 0.00% Reduced -7.6k -7,557
43 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 22 $2 $2 0.00% Reduced -17.9k -17,853
44 EverSource Wealth Advisors, LLC 0.00% of their portfolio BIRMINGHAM, AL 22 $2 $2 0.00% Reduced -1 -1
45 CONCOURSE FINANCIAL GROUP SECURITIES, INC. — of their portfolio BIRMINGHAM, AL 00 $0 $0 — Unchanged