RLYBNasdaqPharmaceutical PreparationsFiscal year ends December 31
Rallybio Corp
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 6, 2026
$16.35+0.07 (+0.43%)
Close on Oct 19, 2026
- Market cap
- $94.80M
- P/E (TTM)
- 2.1
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
100.0%
12M of 5M shares
Institutional holders
37
9 new, 10 sold out
Net institutional buying
7M
In Q2 2026
Insider trades, 12 months
14 buys · 1 sales
Net bought $4.23M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| ADAR1 Capital Management, LLC | 926,352 | 17.50% | 13G (passive) | May 31, 2026 |
| Abigail P. Johnson | 794,720 | 15.00% | 13G (passive) amendment | Jun 30, 2026 |
| Viking Global Opportunities Parent GP LLC | 528,954 | 9.99% | 13G (passive) amendment | Mar 31, 2026 |
| Viking Global Opportunities Portfolio GP LLC | 4,222,969 | 9.99% | 13G (passive) amendment | Dec 31, 2025 |
| James G. Coulter | 378,551 | 7.20% | 13D (active) amendment | Mar 1, 2026 |
| Dames GP LLC | 376,573 | 7.12% | 13G (passive) | Mar 31, 2026 |
| Laurion Capital Management LP | 302,756 | 5.72% | 13G (passive) | Mar 31, 2026 |
| Kush Parmar | 291,788 | 5.50% | 13D (active) amendment | Feb 25, 2026 |
| Pivotal bioVenture Partners Fund I, L.P. | 2,404,644 | 6.40% | 13D (active) amendment | Feb 12, 2024 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of RLYB | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Citadel Advisors LLC | 7,705,787 | 145.10% | $12.73M | +7,685,901 | 0.00% |
| ADAR1 Capital Management, LLC | 926,352 | 17.44% | $14.82M | +905,817 | 0.68% |
| FMR LLC | 794,720 | 14.97% | $12.72M | +1,269 | 0.00% |
| Viking Global Investors LP | 524,347 | 9.87% | $8.39M | – | 0.02% |
| Tpg Gp A, LLC | 378,551 | 7.13% | $6.06M | – | 0.12% |
| Nantahala Capital Management, LLC | 376,844 | 7.10% | $6.03M | +76,209 | 0.10% |
| Pivotal bioVenture Partners Investment Advisor LLC | 300,579 | 5.66% | $4.81M | – | 1.56% |
| Renaissance Technologies LLC | 199,907 | 3.76% | $3.20M | +43,380 | 0.00% |
| Vanguard Capital Management LLC | 172,497 | 3.25% | $2.76M | +60,457 | 0.00% |
| Almitas Capital LLC | 120,682 | 2.27% | $1.93M | −70,524 | 0.46% |
| Rangeley Capital, LLC | 104,850 | 1.97% | $1.68M | +74,720 | 1.53% |
| Mariner, LLC | 50,566 | 0.95% | $809.06K | – | 0.00% |
| Jane Street Group, LLC | 47,423 | 0.89% | $758.77K | New | 0.00% |
| Geode Capital Management, LLC | 32,047 | 0.60% | $512.87K | −3,378 | 0.00% |
| BlackRock, Inc. | 30,332 | 0.57% | $485.31K | +12,846 | 0.00% |
| Hrt Financial LP | 25,657 | 0.48% | $410 | New | 0.00% |
| XTX Topco Ltd | 21,497 | 0.40% | $343.95K | +10,271 | 0.00% |
| Vanguard Fiduciary Trust Co | 16,820 | 0.32% | $269.12K | +3,273 | 0.00% |
| Two Sigma Investments, LP | 16,619 | 0.31% | $265.90K | New | 0.00% |
| State Street Corp | 12,996 | 0.24% | $207.94K | New | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 37 | 12M | 100.0% | 9 / 10 | 6 / 10 | 9M | 2M |
| Q1 2026 | 38 | 5M | 87.9% | 38 / 0 | 0 / 1 | 5M | 0M |
| Q4 2025 | 1 | 0M | 0.2% | 1 / 0 | 0 / 0 | 0M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of RLYB | Value | % of fund | As of |
|---|---|---|---|---|---|
| Fidelity Growth Company Fund | 207,668 | 3.91% | $3.00M | 0.00% | May 31, 2026 |
| Vanguard Total Stock Market Index Fund | 134,620 | 2.53% | $2.15M | 0.00% | Jun 30, 2026 |
| Fidelity Growth Company K6 Fund | 56,522 | 1.06% | $817.31K | 0.00% | May 31, 2026 |
| Fidelity Series Growth Company Fund | 53,600 | 1.01% | $775.06K | 0.00% | May 31, 2026 |
| Vanguard Extended Market Index Fund | 32,447 | 0.61% | $519.15K | 0.00% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 16,252 | 0.31% | $235.00K | 0.00% | May 31, 2026 |
| iShares Micro-Cap ETF | 11,832 | 0.22% | $189.31K | 0.01% | Jun 30, 2026 |
| Dimensional U.S. Small Cap ETF | 6,675 | 0.13% | $106.33K | 0.00% | Jul 31, 2026 |
| U.S. Micro Cap Portfolio | 4,605 | 0.09% | $73.36K | 0.00% | Jul 31, 2026 |
| Fidelity Series Total Market Index Fund | 4,508 | 0.08% | $65.19K | 0.00% | May 31, 2026 |
| Fidelity Total Market Index Fund | 4,079 | 0.08% | $58.98K | 0.00% | May 31, 2026 |
| Vanguard Institutional Total Stock Market Index Fund | 3,141 | 0.06% | $50.26K | 0.00% | Jun 30, 2026 |
| Fidelity Nasdaq Composite Index Fund | 3,003 | 0.06% | $43.42K | 0.00% | May 31, 2026 |
| Vanguard Balanced Index Fund | 2,289 | 0.04% | $36.62K | 0.00% | Jun 30, 2026 |
| 1290 VT Micro Cap Portfolio | 795 | 0.01% | $12.72K | 0.01% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Stephen Uden | Chief Executive Officer, Director | 718,320 | 13.53% | Feb 19, 2025 |
| Jonathan I. Lieber | Chief Financial Officer | 4,115 | 0.08% | Feb 23, 2026 |
| Steven Ryder | Chief Medical Officer | 192,370 | 3.62% | Feb 19, 2025 |
| Hui Liu | Director | 3,562 | 0.07% | Sep 28, 2026 |
| Wendy Chung | Director | 3,562 | 0.07% | Sep 18, 2026 |
| Helen M. Boudreau | Director | 6,542 | 0.12% | Jul 10, 2026 |
| Ronald Hunt | Director | 2,301,603 | 43.34% | Feb 20, 2026 |
| Martin Mackay | Director | 719,126 | 13.54% | Feb 20, 2026 |
| Christine A. Nash | Director | – | – | May 15, 2025 |
| Paula Soteropoulos | Director | 23,882 | 0.45% | May 15, 2025 |
| Robert Lorne Hopfner | Director | 2,267,411 | 42.70% | May 15, 2025 |
| ADAR1 Capital Management, LLC | 10% owner | 926,352 | 17.44% | May 20, 2026 |
| Daniel Schneeberger | 10% owner | 909,943 | 17.13% | May 20, 2026 |
| Llc Fmr | 10% owner | 211,798 | 3.99% | Mar 10, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Hui Liu Director | Sep 24, 2026 | Option exercise | +3,562 | $2.38 | $8.48K | 3,562 |
| Hui Liu Director | Sep 24, 2026 | Option exercise | +8,482 | $7.60 | $64.46K | 12,044 |
| Wendy Chung Director | Sep 16, 2026 | Option exercise | +3,562 | $2.38 | $8.48K | 3,562 |
| Helen M. Boudreau Director | Jul 6, 2026 | Option exercise | +3,562 | $2.38 | $8.48K | 6,542 |
| ADAR1 Capital Management, LLC 10% owner | May 19, 2026 | Buy | +200 | $13.80 | $2.76K | 926,352 |
| ADAR1 Capital Management, LLC 10% owner | May 19, 2026 | Buy | +10,000 | $13.98 | $139.80K | 926,152 |
| ADAR1 Capital Management, LLC 10% owner | May 18, 2026 | Buy | +6,009 | $13.98 | $84.01K | 916,152 |
| Daniel Schneeberger 10% owner | May 15, 2026 | Buy | +100 | $13.80 | $1.38K | 909,943 |
| Daniel Schneeberger 10% owner | May 15, 2026 | Buy | +200 | $13.95 | $2.79K | 910,143 |
| Daniel Schneeberger 10% owner | May 13, 2026 | Buy | +75,178 | $14.00 | $1.05M | 909,843 |
| Daniel Schneeberger 10% owner | May 13, 2026 | Buy | +4,081 | $13.80 | $56.32K | 834,665 |
| ADAR1 Capital Management, LLC 10% owner | May 12, 2026 | Buy | +800 | $13.83 | $11.06K | 830,584 |
| ADAR1 Capital Management, LLC 10% owner | May 11, 2026 | Buy | +19,900 | $14.00 | $278.60K | 829,784 |
| ADAR1 Capital Management, LLC 10% owner | May 11, 2026 | Buy | +5,100 | $14.00 | $71.40K | 784,884 |
| ADAR1 Capital Management, LLC 10% owner | May 11, 2026 | Buy | +25,000 | $14.00 | $350.00K | 809,884 |
| Daniel Schneeberger 10% owner | May 5, 2026 | Buy | +35,101 | $14.00 | $491.41K | 779,784 |
| Daniel Schneeberger 10% owner | May 4, 2026 | Buy | +116,904 | $13.97 | $1.63M | 744,683 |
| Daniel Schneeberger 10% owner | May 4, 2026 | Buy | +3,900 | $13.90 | $54.21K | 627,779 |
| Jonathan I. Lieber Chief Financial Officer | Feb 23, 2026 | Sale | −789 | $5.06 | $3.99K | 4,115 |
| Jonathan I. Lieber Chief Financial Officer | Feb 18, 2026 | Award | +2,500 | – | – | 4,904 |
| Jonathan I. Lieber See Remarks | Mar 14, 2023 | Buy | +5,000 | $5.21 | $26.05K | 5,000 |
| Kush Parmar Director | Mar 7, 2023 | Sale | −100,000 | $8.20 | $820.00K | 2,378,969 |
| Andrew J. Schwab 10% owner | Mar 7, 2023 | Sale | −100,000 | $8.20 | $820.00K | 2,378,969 |
| Kush Parmar Director, 10% owner | Jun 3, 2022 | Sale | −50,329 | $12.50 | $629.11K | 1,251,755 |
| Kush Parmar Director, 10% owner | Jun 3, 2022 | Sale | −99,671 | $12.50 | $1.25M | 2,478,969 |
| 5AM Partners V, LLC 10% owner | Jun 3, 2022 | Sale | −99,671 | $12.50 | $1.25M | 2,478,969 |
| 5AM Partners V, LLC 10% owner | Jun 3, 2022 | Sale | −50,329 | $12.50 | $629.11K | 1,251,755 |
| 5AM Partners V, LLC 10% owner | May 23, 2022 | Sale | −66,447 | $13.00 | $863.81K | 2,578,640 |
| 5AM Partners V, LLC 10% owner | May 23, 2022 | Sale | −33,553 | $13.00 | $436.19K | 1,302,084 |
| Kush Parmar Director, 10% owner | May 23, 2022 | Sale | −33,553 | $13.00 | $436.19K | 1,302,084 |
| Kush Parmar Director, 10% owner | May 23, 2022 | Sale | −66,447 | $13.00 | $863.81K | 2,578,640 |
| Jeffrey M. Fryer See Remarks | Mar 21, 2022 | Buy | +3,000 | $8.04 | $24.12K | 47,048 |
| Kush Parmar Director | Feb 8, 2022 | Sale | −70,461 | $13.05 | $919.52K | 1,335,637 |
| Kush Parmar Director | Feb 8, 2022 | Sale | −139,539 | $13.05 | $1.82M | 2,645,087 |
| 5AM Ventures V, L.P. 10% owner | Feb 8, 2022 | Sale | −70,461 | $13.05 | $919.52K | 1,335,637 |
| 5AM Ventures V, L.P. 10% owner | Feb 8, 2022 | Sale | −139,539 | $13.05 | $1.82M | 2,645,087 |
| Jeffrey M. Fryer See Remarks | Jan 19, 2022 | Buy | +1,400 | $8.70 | $12.18K | 44,048 |
| Stephen Uden See Remarks | Jan 13, 2022 | Buy | +4,193 | $9.06 | $37.99K | 718,320 |
| Stephen Uden See Remarks | Jan 13, 2022 | Buy | +807 | $9.62 | $7.76K | 719,127 |
| Stephen Uden See Remarks | Jan 12, 2022 | Buy | +5,000 | $10.55 | $52.75K | 714,127 |
| Martin Mackay Chief Executive Officer, Director | Jan 11, 2022 | Buy | +4,496 | $10.65 | $47.88K | 282,609 |
| Martin Mackay Chief Executive Officer, Director | Jan 10, 2022 | Buy | +5,504 | $10.10 | $55.59K | 278,113 |
| Jeffrey M. Fryer See Remarks | Jan 7, 2022 | Buy | +705 | $8.97 | $6.32K | 33,353 |
| Jeffrey M. Fryer See Remarks | Jan 7, 2022 | Buy | +9,295 | $9.44 | $87.74K | 42,648 |
| Timothy M. Shannon Director | Aug 2, 2021 | Buy | +76,923 | $13.00 | $1,000.00K | 2,409,712 |
| Kush Parmar Director | Aug 2, 2021 | Buy | +615,384 | $13.00 | $8.00M | 1,406,098 |
| Robert Lorne Hopfner Director | Aug 2, 2021 | Buy | +576,923 | $13.00 | $7.50M | 2,267,411 |
| 5AM Opportunities I, L.P. 10% owner | Aug 2, 2021 | Buy | +615,384 | $13.00 | $8.00M | 1,406,098 |
| Ronald Hunt Director | Aug 2, 2021 | Buy | +153,846 | $13.00 | $2.00M | 2,301,603 |
| Ronald Hunt Director | Aug 2, 2021 | Buy | +153,846 | $13.00 | $2.00M | 2,147,757 |
| Llc Fmr – | Aug 2, 2021 | Conversion | +1,694,388 | – | – | 1,694,388 |
| Global Opportunities Illiquid Investments Sub-Master LP Viking 10% owner | Jul 29, 2021 | Buy | +806,000 | $13.00 | $10.48M | 4,194,777 |
| Global Opportunities Illiquid Investments Sub-Master LP Viking 10% owner | Jul 29, 2021 | Conversion | +3,388,777 | – | – | 3,388,777 |
| Stephen Uden See Remarks | Jul 28, 2021 | Other | +709,127 | – | – | 709,127 |
| Martin Mackay Chief Executive Officer, Director | Jul 28, 2021 | Other | +272,609 | – | – | 272,609 |
| Martin Mackay Chief Executive Officer, Director | Jul 28, 2021 | Other | +436,517 | – | – | 436,517 |
| Jeffrey M. Fryer See Remarks | Jul 28, 2021 | Other | +201,934 | – | – | 201,934 |
| Jeffrey M. Fryer See Remarks | Jul 28, 2021 | Other | +201,934 | – | – | 201,934 |
| Jeffrey M. Fryer See Remarks | Jul 28, 2021 | Other | +272,609 | – | – | 272,609 |
| Jeffrey M. Fryer See Remarks | Jul 28, 2021 | Other | +32,648 | – | – | 32,648 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.