# ARCA BIOPHARMA INC (ABIO)

> Institutional ownership reported to the SEC as of Q2 2024, from Form 13F filings. Source: https://holderbook.com/stocks/ABIO/

- Reporting holders: 32
- Reported value: $49.6M
- Held through calls: 0.3%
- Held through puts: 0.1%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [Cable Car Capital LLC](https://holderbook.com/funds/1699575-cable-car-capital-llc/) | $15.3M | 4,000,452 | 16.1% | 3 |
| [RTW INVESTMENTS, LP](https://holderbook.com/funds/1493215-rtw-investments-lp/) | $5.4M | 1,400,000 | 0.1% | 1 |
| [JANUS HENDERSON GROUP PLC](https://holderbook.com/funds/1274173-janus-henderson-group-plc/) | $5.2M | 1,382,736 | 0.0% | 1 |
| [ADAGE CAPITAL PARTNERS GP, L.L.C.](https://holderbook.com/funds/1165408-adage-capital-partners-gp-l-l-c/) | $4.6M | 1,200,000 | 0.0% | 1 |
| [Avidity Partners Management LP](https://holderbook.com/funds/1791827-avidity-partners-management-lp/) | $3.8M | 1,000,000 | 0.2% | 1 |
| [VR Adviser, LLC](https://holderbook.com/funds/1615982-vr-adviser-llc/) | $3.3M | 866,375 | 0.2% | 1 |
| [COWEN AND COMPANY, LLC](https://holderbook.com/funds/48966-cowen-and-company-llc/) | $2.7M | 700,000 | 0.1% | 1 |
| [MORGAN STANLEY](https://holderbook.com/funds/895421-morgan-stanley/) | $2.5M | 650,000 | 0.0% | 1 |
| [VANGUARD GROUP INC](https://holderbook.com/funds/102909-vanguard-group-inc/) | $1.7M | 453,598 | 0.0% | 16 |
| [COMMODORE CAPITAL LP](https://holderbook.com/funds/1831942-commodore-capital-lp/) | $1.6M | 414,325 | 0.1% | 1 |
| [BlackRock Inc.](https://holderbook.com/funds/1364742-blackrock-inc/) | $949.5K | 247,909 | 0.0% | 16 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1214717-geode-capital-management-llc/) | $619.5K | 161,735 | 0.0% | 15 |
| [ADAR1 Capital Management, LLC](https://holderbook.com/funds/1940272-adar1-capital-management-llc/) | $324.3K | 84,676 | 0.1% | 1 |
| [RENAISSANCE TECHNOLOGIES LLC](https://holderbook.com/funds/1037389-renaissance-technologies-llc/) | $280.0K | 73,099 | 0.0% | 9 |
| [Affinity Asset Advisors, LLC](https://holderbook.com/funds/1773195-affinity-asset-advisors-llc/) | $277.6K | 72,484 | 0.0% | 1 |
| [STATE STREET CORP](https://holderbook.com/funds/93751-state-street-corp/) | $228.7K | 59,707 | 0.0% | 13 |
| [DIMENSIONAL FUND ADVISORS LP](https://holderbook.com/funds/354204-dimensional-fund-advisors-lp/) | $162.8K | 42,502 | 0.0% | 11 |
| [abrdn plc](https://holderbook.com/funds/1716774-abrdn-plc/) | $124.3K | 32,461 | 0.0% | 3 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $121.4K | 3,985 | 0.0% | 14 |
| [Cubist Systematic Strategies, LLC](https://holderbook.com/funds/1603465-cubist-systematic-strategies-llc/) | $106.4K | 27,779 | 0.0% | 1 |
| [NORTHERN TRUST CORP](https://holderbook.com/funds/73124-northern-trust-corp/) | $80.4K | 20,982 | 0.0% | 15 |
| [SUSQUEHANNA INTERNATIONAL GROUP, LLP](https://holderbook.com/funds/1446194-susquehanna-international-group-llp/) | $74.7K | 0 | 0.0% | 1 |
| [CHARLES SCHWAB INVESTMENT MANAGEMENT INC](https://holderbook.com/funds/884546-charles-schwab-investment-management-inc/) | $57.4K | 14,988 | 0.0% | 6 |
| [GROUP ONE TRADING, L.P.](https://holderbook.com/funds/932540-group-one-trading-l-p/) | $51.8K | 7,131 | 0.0% | 1 |
| [Activest Wealth Management](https://holderbook.com/funds/1883134-activest-wealth-management/) | $7.7K | 2,000 | 0.0% | 1 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2024 | 32 | $49.6M |
| Q1 2024 | 21 | $12.8M |
| Q4 2023 | 24 | $12.7M |
| Q3 2023 | 23 | $6.6M |
| Q2 2023 | 25 | $5.9M |
| Q1 2023 | 28 | $5.4M |
| Q4 2022 | 24 | $6.5M |
| Q3 2022 | 22 | $8.2M |
| Q2 2022 | 22 | $8.5M |
| Q1 2022 | 21 | $3.0M |
| Q4 2021 | 17 | $3.0M |
| Q3 2021 | 16 | $5.0M |