RALLYBIO CORP (RLYB) Institutional Ownership Changes & 13F Activity
RALLYBIO CORP (RLYB). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Adar1 Capital Management, Llc, Cormorant Asset Management, Lp, Balyasny Asset Management L.P., Laurion Capital Management Lp, and 5Am Venture Management, Llc.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| State Street Corp | Buy | +12,996 | — | 12,996 | $207.94K | Q2 2026 | Sep 22, 2026 |
| Citadel Advisors Llc | Buy | +52,314 | +263.1% | 72,200 | $1.16M | Q2 2026 | Sep 02, 2026 |
| Nantahala Capital Management, Llc | Sell | -112,213 | -37.3% | 188,422 | $3.01M | Q2 2026 | Aug 19, 2026 |
| Almitas Capital Llc | Sell | -70,524 | -36.9% | 120,682 | $1.93M | Q2 2026 | Aug 17, 2026 |
| Adar1 Capital Management, Llc | Buy | +905,817 | +4411.1% | 926,352 | $14.82M | Q2 2026 | Aug 14, 2026 |
| Rangeley Capital, Llc | Buy | +74,720 | +248.0% | 104,850 | $1.68M | Q2 2026 | Aug 14, 2026 |
| Jane Street Group, Llc | Buy | +47,423 | — | 47,423 | $758.77K | Q2 2026 | Aug 14, 2026 |
| Hrt Financial Lp | Buy | +25,657 | — | 25,657 | $410.00K | Q2 2026 | Aug 14, 2026 |
| Two Sigma Investments, Lp | Buy | +16,619 | — | 16,619 | $265.90K | Q2 2026 | Aug 14, 2026 |
| Xtx Topco Ltd | Buy | +10,271 | +91.5% | 21,497 | $343.95K | Q2 2026 | Aug 14, 2026 |
| Barclays Plc | Buy | +3 | — | 3 | $48.00 | Q2 2026 | Aug 14, 2026 |
| Vanguard Capital Management Llc | Buy | +60,457 | +54.0% | 172,497 | $2.76M | Q2 2026 | Aug 13, 2026 |
| Renaissance Technologies LLC | Buy | +43,380 | +27.7% | 199,907 | $3.20M | Q2 2026 | Aug 13, 2026 |
| Ubs Group Ag | Sell | -7,768 | -98.2% | 146 | $2.34K | Q2 2026 | Aug 13, 2026 |
| Vanguard Fiduciary Trust Co | Buy | +3,273 | +24.2% | 16,820 | $269.12K | Q2 2026 | Aug 13, 2026 |
| Fmr Llc | Buy | +1,269 | +0.2% | 794,720 | $12.72M | Q2 2026 | Aug 13, 2026 |
| Morgan Stanley | Sell | -1 | -0.8% | 125 | $2.00K | Q2 2026 | Aug 13, 2026 |
| Geode Capital Management, Llc | Sell | -3,378 | -9.5% | 32,047 | $512.87K | Q2 2026 | Aug 12, 2026 |
| Truvestments Capital Llc | Buy | +129 | — | 129 | $2.06K | Q2 2026 | Aug 12, 2026 |
| Jpmorgan Chase & Co | Buy | +9 | — | 9 | $145.00 | Q2 2026 | Aug 12, 2026 |
| Quadrature Capital Ltd | Buy | +12,995 | — | 12,995 | $207.92K | Q2 2026 | Aug 07, 2026 |
| Blackrock, Inc. | Buy | +12,846 | +73.5% | 30,332 | $485.31K | Q2 2026 | Aug 07, 2026 |
| Caitong International Asset Management Co., Ltd | Buy | +434 | — | 434 | $6.94K | Q2 2026 | Aug 05, 2026 |
| Sbi Securities Co., Ltd. | Sell | -18 | -3.4% | 506 | $8.10K | Q2 2026 | Jul 23, 2026 |
| Cormorant Asset Management, Lp | Sell | -400,000 | -100.0% | 0 | $0.00 | Q2 2026 | May 15, 2026 |
| Balyasny Asset Management L.P. | Sell | -376,573 | -100.0% | 0 | $0.00 | Q2 2026 | May 15, 2026 |
| 5Am Venture Management, Llc | Sell | -291,788 | -100.0% | 0 | $0.00 | Q2 2026 | May 15, 2026 |
| Gts Securities Llc | Sell | -22,016 | -100.0% | 0 | $0.00 | Q2 2026 | May 15, 2026 |
| Tower Research Capital Llc (Trc) | Sell | -907 | -100.0% | 0 | $0.00 | Q2 2026 | May 15, 2026 |
| Laurion Capital Management Lp | Sell | -302,756 | -100.0% | 0 | $0.00 | Q2 2026 | May 14, 2026 |
Frequently asked questions about RLYB activity
Which institutional owners are buying RLYB?
Institutional owners buying RLYB include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in RLYB activity?
"Buy" means an investor increased their reported position in RLYB compared to the prior reporting period. This reflects growing exposure to RALLYBIO CORP (RLYB) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in RLYB increasing?
Institutional interest in RLYB can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.
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