Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in BCAB held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | ACORN CAPITAL ADVISORS, LLC | 5.4M | $865K | +11.8% | 428.723% | 0.25% |
| 2 | MILLENNIUM MANAGEMENT LLC | 2.8M | $444K | +261.6% | 218.604% | 0.00% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 1.6M | $266K | β | 130.786% | 0.00% |
| 4 | GEODE CAPITAL MANAGEMENT, LLC | 689K | $111K | +37.8% | 54.652% | 0.00% |
| 5 | DEUTSCHE BANK AG\ | 525K | $84K | 0.0% | 41.660% | 0.00% |
| 6 | RENAISSANCE TECHNOLOGIES LLC | 511K | $82K | -27.8% | 40.484% | 0.00% |
| 7 | BlackRock, Inc. | 481K | $77K | 0.0% | 38.138% | 0.00% |
| 8 | CITADEL ADVISORS LLC | 474K | $76K | β | 37.555% | 0.00% |
| 9 | UBS Group AG | 376K | $60K | +66.4% | 29.783% | 0.00% |
| 10 | VANGUARD FIDUCIARY TRUST CO | 273K | $44K | β | 21.683% | 0.00% |
| 11 | ADAR1 Capital Management, LLC | 228K | $37K | +24.6% | 18.089% | 0.00% |
| 12 | STATE STREET CORP | 151K | $24K | 0.0% | 12.004% | 0.00% |
| 13 | NORTHERN TRUST CORP | 103K | $17K | 0.0% | 8.207% | 0.00% |
| 14 | SIMPLEX TRADING, LLC | 74K | $12K | -38.6% | 5.860% | 0.00% |
| 15 | Stonepine Capital Management, LLC | 65K | $11K | β | 5.185% | 0.01% |
| 16 | XTX Topco Ltd | 57K | $9K | -6.3% | 4.489% | 0.00% |
| 17 | MORGAN STANLEY | 55K | $9K | +27.0% | 4.395% | 0.00% |
| 18 | MAI Capital Management | 52K | $8K | 0.0% | 4.084% | 0.00% |
| 19 | Kestra Advisory Services, LLC | 44K | $7K | β | 3.509% | 0.00% |
| 20 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 39K | $6K | -52.2% | 3.097% | 0.00% |
| 21 | INTL FCSTONE INC. | 29K | $5K | β | 2.337% | 0.00% |
| 22 | COMMONWEALTH EQUITY SERVICES, LLC | 25K | $4K | 0.0% | 2.006% | 0.00% |
| 23 | Magnus Financial Group LLC | 20K | $3K | 0.0% | 1.586% | 0.00% |
| 24 | Tower Research Capital LLC (TRC) | 17K | $3K | +219.6% | 1.348% | 0.00% |
| 25 | Vanguard Global Advisers, LLC | 17K | $3K | β | 1.319% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in BCAB β a direct measure of their conviction.
Filings activity in BCAB during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new BCAB position in Q1 2026
Institutions that fully closed their BCAB position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 32 | 22% | 46.71% | 97.19 pp | $2M | 68% |
| Q4 2025 | 41 | +0.0% | 143.90% | 25.96 pp | $7M | 15% |
| Q3 2025 | 41 | +5.1% | 169.86% | +75.81 pp | $8M | +81% |
| Q2 2025 | 39 | 7.1% | 94.05% | +10.70 pp | $5M | +13% |
| Q1 2025 | 42 | 37% | 83.35% | 116.64 pp | $4M | 71% |
| Q4 2024 | 67 | +9.8% | 199.99% | +0.00 pp | $14M | 52% |
| Q3 2024 | 61 | 22% | 199.99% | +0.00 pp | $29M | 2.0% |
| Q2 2024 | 78 | β | 199.99% | β | $29M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying BCAB stock.
Based on Q1 2026 13F filings, institutional ownership of BioAtla, Inc. stands at 46.7%, held across 32 reporting institutions.
ACORN CAPITAL ADVISORS, LLC is the largest reported institutional holder of BCAB, with approximately 5,406,345 shares worth $0.00B as of Q1 2026.
Yes β 4 widely-followed marquee investors appear among the top 25 institutional holders of BCAB, including MILLENNIUM MANAGEMENT LLC, RENAISSANCE TECHNOLOGIES LLC, CITADEL ADVISORS LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP.
Our composite Smart Money Score for BCAB is 42 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
8 institutions opened new positions in BCAB during Q1 2026, while 17 fully exited. 1 added to existing positions and 23 trimmed.
BCAB institutional ownership fell by 97.19 percentage points quarter-over-quarter, with a net change of -9 holders.
The top 10 institutions account for 92.8% of all reported 13F value in BCAB, and the top 25 account for 99.7%.
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.
BioAtla, Inc. (BCAB) Institutional Ownership