Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in BOLD held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | 2.7M | $3.0M | +0.4% | 11.999% | 0.00% |
| 2 | CITADEL ADVISORS LLC | 1.3M | $1.5M | -0.9% | 5.975% | 0.00% |
| 3 | SECTORAL ASSET MANAGEMENT INC | 679K | $746K | 0.0% | 3.021% | 0.62% |
| 4 | Stonepine Capital Management, LLC | 598K | $657K | -15.8% | 2.661% | 0.53% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 597K | $657K | — | 2.658% | 0.00% |
| 6 | WELLINGTON MANAGEMENT GROUP LLP | 556K | $612K | 0.0% | 2.476% | 0.00% |
| 7 | RENAISSANCE TECHNOLOGIES LLC | 399K | $439K | +16.9% | 1.776% | 0.00% |
| 8 | Alyeska Investment Group, L.P. | 300K | $330K | 0.0% | 1.336% | 0.00% |
| 9 | RBF Capital, LLC | 200K | $220K | 0.0% | 0.890% | 0.01% |
| 10 | Ensign Peak Advisors, Inc | 188K | $206K | 0.0% | 0.835% | 0.00% |
| 11 | Sio Capital Management, LLC | 164K | $180K | 0.0% | 0.729% | 0.03% |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | 128K | $140K | +35.6% | 0.568% | 0.00% |
| 13 | MILLENNIUM MANAGEMENT LLC | 100K | $110K | -26.2% | 0.445% | 0.00% |
| 14 | LANDSCAPE CAPITAL MANAGEMENT, L.L.C. | 86K | $94K | -32.8% | 0.382% | 0.01% |
| 15 | BlackRock, Inc. | 71K | $78K | +5.4% | 0.315% | 0.00% |
| 16 | VANGUARD FIDUCIARY TRUST CO | 65K | $72K | — | 0.290% | 0.00% |
| 17 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 51K | $56K | 0.0% | 0.225% | 0.00% |
| 18 | Walleye Capital LLC | 40K | $44K | 0.0% | 0.176% | 0.00% |
| 19 | XTX Topco Ltd | 35K | $38K | -12.4% | 0.154% | 0.00% |
| 20 | Qube Research & Technologies Ltd | 17K | $19K | -6.5% | 0.078% | 0.00% |
| 21 | Squarepoint Ops LLC | 16K | $18K | — | 0.073% | 0.00% |
| 22 | STATE STREET CORP | 16K | $18K | 0.0% | 0.071% | 0.00% |
| 23 | MORGAN STANLEY | 13K | $14K | 0.0% | 0.058% | 0.00% |
| 24 | Pure Financial Advisors, Inc. | 10K | $11K | — | 0.045% | 0.00% |
| 25 | CITIGROUP INC | 9K | $10K | -64.8% | 0.039% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in BOLD — a direct measure of their conviction.
Filings activity in BOLD during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new BOLD position in Q1 2026
Institutions that fully closed their BOLD position in Q1 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 35 | 2.8% | 29.09% | 3.89 pp | $9M | 12% |
| Q4 2025 | 36 | +2.9% | 32.98% | 4.33 pp | $10M | 12% |
| Q3 2025 | 35 | 22% | 37.31% | +6.23 pp | $12M | +20% |
| Q2 2025 | 45 | 18% | 31.08% | 168.91 pp | $10M | 98% |
| Q1 2025 | 55 | 1.8% | 199.99% | +82.05 pp | $419M | +1021% |
| Q4 2024 | 56 | +0.0% | 117.94% | 82.05 pp | $37M | 93% |
| Q3 2024 | 56 | +19% | 199.99% | +35.76 pp | $519M | +898% |
| Q2 2024 | 47 | — | 164.23% | — | $52M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying BOLD stock.
Based on Q1 2026 13F filings, institutional ownership of Boundless Bio, Inc. stands at 29.1%, held across 35 reporting institutions.
FMR LLC is the largest reported institutional holder of BOLD, with approximately 2,695,455 shares worth $0.00B as of Q1 2026.
Yes — 3 widely-followed marquee investors appear among the top 25 institutional holders of BOLD, including CITADEL ADVISORS LLC, RENAISSANCE TECHNOLOGIES LLC, MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for BOLD is 46 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
7 institutions opened new positions in BOLD during Q1 2026, while 8 fully exited. 3 added to existing positions and 24 trimmed.
BOLD institutional ownership fell by 3.89 percentage points quarter-over-quarter, with a net change of -1 holders.
The top 10 institutions account for 90.2% of all reported 13F value in BOLD, and the top 25 account for 100.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Boundless Bio, Inc. (BOLD) Institutional Ownership