New Positions
5 managers initiated
Top five by reported value
Rallybio Corp NASDAQ NMS - GLOBAL MARKET:RLYB
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31 · prior 2025-09-30.
5 new8 added32 reduced5 exited
Total Institutional Holders
45
as of 2025-12-31
Top Holder
AJU IB Investment Co., Ltd.
$4.1M
Largest QoQ Increase
RENAISSANCE TECHNOLOGIES LLC
+120,892 sh
Largest QoQ Decrease
New Leaf Venture Partners, L.L.C.
-3,301,603 sh
New Positions(5)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| TWO SIGMA ADVISERS, LP | 19,300 | +19,300 | $13.2K | +$13.2K | — |
| Ground Swell Capital, LLC | 15,399 | +15,399 | $10.6K | +$10.6K | — |
| ACT Advisors, LLC. | 13,153 | +13,153 | $9.0K | +$9.0K | — |
| Allworth Financial LP | 50 | +50 | $35 | +$35 | — |
| GSA CAPITAL PARTNERS LLP | 19,303 | +19,303 | $13 | +$13 | — |
Added To(8)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| RENAISSANCE TECHNOLOGIES LLC | 835,692 | +120,892 | $573.4K | +$216.7K | 16.9% |
| VANGUARD GROUP INC | 1,016,249 | +16,622 | $697.1K | +$198.3K | 1.7% |
| GEODE CAPITAL MANAGEMENT, LLC | 248,005 | +2,996 | $170.2K | +$47.9K | 1.2% |
| XTX Topco Ltd | 97,313 | +38,205 | $66.8K | +$37.3K | 64.6% |
| TWO SIGMA INVESTMENTS, LP | 37,000 | +15,547 | $25.4K | +$14.7K | 72.5% |
| BARCLAYS PLC | 15,390 | +9,671 | $5.2K | +$2.3K | 169.1% |
| UBS Group AG | 4,577 | +2,206 | $3.1K | +$2.0K | 93.0% |
| BANK OF AMERICA CORP /DE/ | 251 | +35 | $172 | +$65 | 16.2% |
Reduced(32)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| AJU IB Investment Co., Ltd. | 754,678 | 0 | $4.1M | +$3.8M | 0.0% |
| VIKING GLOBAL INVESTORS LP | 4,194,777 | 0 | $2.9M | +$784.8K | 0.0% |
| JOHNSON & JOHNSON | 3,636,363 | 0 | $2.5M | +$680.4K | 0.0% |
| 5AM Venture Management, LLC | 3,630,724 | 0 | $2.5M | +$679.3K | 0.0% |
| TPG GP A, LLC | 3,028,414 | 0 | $2.1M | +$575.4K | 0.0% |
| Pivotal bioVenture Partners Investment Advisor LLC | 2,404,644 | 0 | $1.6M | +$449.7K | 0.0% |
| FMR LLC | 1,694,388 | 0 | $1.2M | +$317.0K | 0.0% |
| Almitas Capital LLC | 1,529,653 | -9,074 | $1.0M | +$281.7K | -0.6% |
| Canaan Partners XI LLC | 450,000 | 0 | $308.7K | +$84.2K | 0.0% |
| Mariner, LLC | 404,546 | 0 | $277.6K | +$75.7K | 0.0% |
| CITADEL ADVISORS LLC | 253,842 | -184,863 | $174.2K | -$44.8K | -42.1% |
| BlackRock, Inc. | 141,663 | 0 | $97.2K | +$26.5K | 0.0% |
| Rangeley Capital, LLC | 40,000 | -43,007 | $27.4K | -$14.0K | -51.8% |
| STATE STREET CORP | 62,072 | 0 | $42.6K | +$11.6K | 0.0% |
| NORTHERN TRUST CORP | 38,124 | 0 | $26.2K | +$7.1K | 0.0% |
| Resources Investment Advisors, LLC. | 20,000 | 0 | $13.7K | +$3.7K | 0.0% |
| GREAT VALLEY ADVISOR GROUP, INC. | 15,000 | 0 | $10.3K | +$2.8K | 0.0% |
| Utah Retirement Systems | 13,240 | 0 | $9.1K | +$2.5K | 0.0% |
| CITIGROUP INC | 3,932 | -5,963 | $2.7K | -$2.2K | -60.3% |
| Tower Research Capital LLC (TRC) | 4,524 | -5,657 | $3.1K | -$2.0K | -55.6% |
| MERCER GLOBAL ADVISORS INC /ADV | 10,000 | 0 | $6.9K | +$1.9K | 0.0% |
| Hartford Financial Management Inc. | 6,500 | 0 | $4.5K | +$1.2K | 0.0% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 100,724 | -35,570 | $69.1K | +$1.1K | -26.1% |
| MORGAN STANLEY | 4,640 | 0 | $3.2K | +$868 | 0.0% |
| PRUDENTIAL FINANCIAL INC | 29,100 | -9,300 | $20.0K | +$804 | -24.2% |
| SBI Securities Co., Ltd. | 4,248 | 0 | $2.9K | +$795 | 0.0% |
| JPMORGAN CHASE & CO | 82 | -800 | $56 | -$384 | -90.7% |
| BNP PARIBAS ARBITRAGE, SNC | 980 | 0 | $672 | +$183 | 0.0% |
| WELLS FARGO & COMPANY/MN | 300 | 0 | $206 | +$56 | 0.0% |
| ACADIAN ASSET MANAGEMENT LLC | 83,480 | -6,767 | $56 | +$12 | -7.5% |
| HRT FINANCIAL LP | 21,387 | -10,837 | $14 | -$2 | -33.6% |
| Virtu Financial LLC | 27,132 | -12,171 | $19 | -$1 | -31.0% |
Sold Out(5)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| New Leaf Venture Partners, L.L.C. | 0 | -3,301,603 | $0 | -$1.6M | — |
| NEW YORK STATE COMMON RETIREMENT FUND | 0 | -62,807 | $0 | -$266.0K | — |
| CAPTRUST FINANCIAL ADVISORS | 0 | -10,000 | $0 | -$5.0K | — |
| Rockefeller Capital Management L.P. | 0 | -550 | $0 | -$274 | — |
| JONES FINANCIAL COMPANIES LLLP | 0 | -90 | $0 | -$50 | — |
Top Holders by reported value
Ranked by the dollar value reported on the latest Form 13F. Share counts reflect long positions as of 2025-12-31.
| Manager | Shares | $ Value | Δ Shares | QoQ % |
|---|---|---|---|---|
| AJU IB Investment Co., Ltd. | 754,678 | $4.1M | 0 | 0.0% |
| VIKING GLOBAL INVESTORS LP | 4,194,777 | $2.9M | 0 | 0.0% |
| JOHNSON & JOHNSON | 3,636,363 | $2.5M | 0 | 0.0% |
| 5AM Venture Management, LLC | 3,630,724 | $2.5M | 0 | 0.0% |
| TPG GP A, LLC | 3,028,414 | $2.1M | 0 | 0.0% |
| Pivotal bioVenture Partners Investment Advisor LLC | 2,404,644 | $1.6M | 0 | 0.0% |
| FMR LLC | 1,694,388 | $1.2M | 0 | 0.0% |
| Almitas Capital LLC | 1,529,653 | $1.0M | -9,074 | -0.6% |
| VANGUARD GROUP INC | 1,016,249 | $697.1K | +16,622 | 1.7% |
| RENAISSANCE TECHNOLOGIES LLC | 835,692 | $573.4K | +120,892 | 16.9% |
| Canaan Partners XI LLC | 450,000 | $308.7K | 0 | 0.0% |
| Mariner, LLC | 404,546 | $277.6K | 0 | 0.0% |
| CITADEL ADVISORS LLC | 253,842 | $174.2K | -184,863 | -42.1% |
| GEODE CAPITAL MANAGEMENT, LLC | 248,005 | $170.2K | +2,996 | 1.2% |
| BlackRock, Inc. | 141,663 | $97.2K | 0 | 0.0% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 100,724 | $69.1K | -35,570 | -26.1% |
| XTX Topco Ltd | 97,313 | $66.8K | +38,205 | 64.6% |
| STATE STREET CORP | 62,072 | $42.6K | 0 | 0.0% |
| Rangeley Capital, LLC | 40,000 | $27.4K | -43,007 | -51.8% |
| NORTHERN TRUST CORP | 38,124 | $26.2K | 0 | 0.0% |
New & Closed Positions this quarter
Closed Positions
5 managers exited
Top five by prior-quarter value
Methodology
Form 13F is the SEC's quarterly disclosure for institutional investment managers exercising discretion over $100 million or more in qualifying U.S. equity securities. Managers must file within 45 days of each calendar quarter end, which is why holdings shown here reflect a snapshot at the period date — not real-time positioning.
Quarter-over-quarter deltas compare each manager's most recently reported share count for RLYB against its prior-quarter count. New positions are entries where the prior count was zero; closed positions are entries where the current count is zero. Amendments (13F-HR/A) replace prior filings for the same period.
Source: SEC EDGAR Form 13F (XML information tables). Dollar values are as reported by the manager and may use mid-quarter pricing conventions. CUSIP-to-ticker resolution is best-effort.