# RALLYBIO CORP (RLYB)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/RLYB/

- Reporting holders: 38
- Reported value: $81.0M
- Shares held by institutions: 11,973,648 of 5,310,499 outstanding
- Held through calls: 0.0%
- Held through puts: 0.0%

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 |
|---|---|---|---|---|
| [ADAR1 Capital Management, LLC](https://holderbook.com/funds/1940272-adar1-capital-management-llc/) | $14.8M | 926,352 | 0.7% | 2 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $13.9M | 7,777,987 | 0.0% | 2 |
| [FMR LLC](https://holderbook.com/funds/315066-fmr-llc/) | $12.7M | 794,720 | 0.0% | 2 |
| [VIKING GLOBAL INVESTORS LP](https://holderbook.com/funds/1103804-viking-global-investors-lp/) | $8.4M | 524,347 | 0.0% | 2 |
| [TPG GP A, LLC](https://holderbook.com/funds/1903793-tpg-gp-a-llc/) | $6.1M | 378,551 | 0.1% | 2 |
| [Nantahala Capital Management, LLC](https://holderbook.com/funds/1472322-nantahala-capital-management-llc/) | $6.0M | 376,844 | 0.1% | 2 |
| [Pivotal bioVenture Partners Investment Advisor LLC](https://holderbook.com/funds/1844645-pivotal-bioventure-partners-investment-advisor-llc/) | $4.8M | 300,579 | 1.6% | 2 |
| [RENAISSANCE TECHNOLOGIES LLC](https://holderbook.com/funds/1037389-renaissance-technologies-llc/) | $3.2M | 199,907 | 0.0% | 2 |
| [VANGUARD CAPITAL MANAGEMENT LLC](https://holderbook.com/funds/2100119-vanguard-capital-management-llc/) | $2.8M | 172,497 | 0.0% | 2 |
| [Almitas Capital LLC](https://holderbook.com/funds/1596468-almitas-capital-llc/) | $1.9M | 120,682 | 0.5% | 2 |
| [Rangeley Capital, LLC](https://holderbook.com/funds/1517796-rangeley-capital-llc/) | $1.7M | 104,850 | 1.5% | 2 |
| [Mariner, LLC](https://holderbook.com/funds/1373442-mariner-llc/) | $809.1K | 50,566 | 0.0% | 2 |
| [JANE STREET GROUP, LLC](https://holderbook.com/funds/1595888-jane-street-group-llc/) | $758.8K | 47,423 | 0.0% | 1 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1214717-geode-capital-management-llc/) | $512.9K | 32,047 | 0.0% | 2 |
| [BlackRock, Inc.](https://holderbook.com/funds/2012383-blackrock-inc/) | $485.3K | 30,332 | 0.0% | 2 |
| [STATE STREET CORP](https://holderbook.com/funds/93751-state-street-corp/) | $415.9K | 25,992 | 0.0% | 1 |
| [HRT FINANCIAL LP](https://holderbook.com/funds/1475597-hrt-financial-lp/) | $410.0K | 25,657 | 0.0% | 1 |
| [XTX Topco Ltd](https://holderbook.com/funds/1828301-xtx-topco-ltd/) | $344.0K | 21,497 | 0.0% | 2 |
| [VANGUARD FIDUCIARY TRUST CO](https://holderbook.com/funds/933478-vanguard-fiduciary-trust-co/) | $269.1K | 16,820 | 0.0% | 2 |
| [TWO SIGMA INVESTMENTS, LP](https://holderbook.com/funds/1179392-two-sigma-investments-lp/) | $265.9K | 16,619 | 0.0% | 1 |
| [Quadrature Capital Ltd](https://holderbook.com/funds/1651424-quadrature-capital-ltd/) | $207.9K | 12,995 | 0.0% | 1 |
| [DIMENSIONAL FUND ADVISORS LP](https://holderbook.com/funds/354204-dimensional-fund-advisors-lp/) | $180.5K | 11,280 | 0.0% | 2 |
| [Vanguard Global Advisers, LLC](https://holderbook.com/funds/1811242-vanguard-global-advisers-llc/) | $23.1K | 1,442 | 0.0% | 2 |
| [MERCER GLOBAL ADVISORS INC /ADV](https://holderbook.com/funds/853758-mercer-global-advisors-inc-adv/) | $20.0K | 1,250 | 0.0% | 1 |
| [Hartford Financial Management Inc.](https://holderbook.com/funds/1352526-hartford-financial-management-inc/) | $13.0K | 812 | 0.0% | 2 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 38 | $81.0M |
| Q1 2026 | 38 | $41.9M |
| Q4 2025 | 46 | $20.7M |
| Q3 2025 | 45 | $14.9M |
| Q2 2025 | 48 | $10.5M |
| Q1 2025 | 47 | $20.9M |
| Q4 2024 | 49 | $31.1M |
| Q3 2024 | 49 | $36.5M |
| Q2 2024 | 63 | $39.6M |
| Q1 2024 | 60 | $56.2M |
| Q4 2023 | 53 | $71.2M |
| Q3 2023 | 58 | $105.2M |