Rallybio Corp
RLYB- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001739410
In the last 90 days, Rallybio Corp insiders filed 0 open-market purchases and 1 sale; 37 institutions reported holding it in 13F filings for Q2 2026, worth $65.0M in total; Viking Global Investors is the only superinvestor holding it.
Key figures
- Market capClose on Nov 10, 2026
- $84.9M
- Insider buysOpen market, last 90 days
- 0
- Insider sellsLast 90 days, $9.61K in total
- 1
- 13F holdersQ2 2026, −1 vs. previous quarter
- 37
- 13F valueReported value at the end of Q2 2026
- $65.0M
- Superinvestors holdingAt the end of Q2 2026
- 1
Price chart
Financials
See financial statementsFrom SEC filings, in USD.
- Revenue, FY2025
- $858.0K
- +43.0% year over year
- Net income, FY2025
- -$8.98M
- No comparable prior period
- Free cash flow, FY2025
- –
- No comparable prior period
- Revenue, Q3 FY2026
- $0
- −100.0% year over year
Revenue flow, FY2025
Green is profit; orange is costs, expenses and taxes. Percentages are shares of revenue.
Net loss for FY2025: $8.98M (1046.4% of revenue).
Short interest
See short dataFrom FINRA, settlement date Oct 30, 2026.
- Short interest
- 39.0K
- Shares sold short
- Change
- −1.94K
- −4.7% vs. previous
- Days to cover
- 1.18
- At average daily volume
Superinvestors holding RLYB, Q2 2026
Go to the superinvestors tab1 superinvestor reports holding Rallybio Corp on Form 13F. Percentages are the stock's share of each portfolio.
Viking Global Investors
Andreas Halvorsen
<0.1%
Rallybio Corp's share of the portfolio
- Shares
- 524,347
- Value
- $8.39M
Latest insider trades
See all insider tradesOpen-market purchases and sales by Rallybio Corp insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Oct 28, 2026 (view filing)5:03 PM ET | Oct 27 | 1 day | Lieber Jonathan IChief Financial Officer | SSale | −599 | $16.04 | −$9.61K | −3.7%15.6K after | |
| May 20, 2026 (view filing)8:45 PM ET | May 18-19 | 2 days | Schneeberger Daniel and 1 other10% Owner | PPurchase | +16.2K | $13.98 | +$226.6K | +1.8%926.4K after | 3 lots |
| May 15, 2026 (view filing)8:49 PM ET | May 13-15 | 2 days | Schneeberger Daniel and 1 other10% Owner | PPurchase | +79.6K | $13.99 | +$1.11M | +9.6%910.1K after | 4 lots |
| May 13, 2026 (view filing)9:22 PM ET | May 11-12 | 2 days | Schneeberger Daniel and 1 other10% Owner | PPurchase | +50.8K | $14.00 | +$711.1K | +6.5%830.6K after | 4 lots |
| May 6, 2026 (view filing)9:32 PM ET | May 4-5 | 2 days | Schneeberger Daniel and 1 other10% Owner | PPurchase | +155.9K | $13.97 | +$2.18M | +25.0%779.8K after | 3 lots |
| Feb 23, 2026 (view filing) | Feb 23 | Same day | Lieber Jonathan IChief Financial Officer | SSale | −789 | $5.06 | −$3.99K | −16.1%4.12K after | |
| Mar 16, 2023 (view filing) | Mar 14 | 2 days | Lieber Jonathan ISee Remarks | PPurchase | +5.00K | $5.21 | +$26.1K | New position5.00K after | |
| Mar 9, 2023 (view filing)4:35 PM ET | Mar 7 | 2 days | Rocklage Scott M and 3 others10% Owner | SSale | −100.0K | $8.20 | −$820.0K | −4.0%2.38M after | Duplicate filing |
| Mar 9, 2023 (view filing) | Mar 7 | 2 days | Parmar KushDirector | SSale | −100.0K | $8.20 | −$820.0K | −4.0%2.38M after | |
| Nov 17, 2022 (view filing)4:30 PM ET | Nov 15 | 2 days | Viking Global Investors LP and 7 others10% Owner | PPurchase | +3.33M | $6.00 | +$20.0M | –3.33M after | Derivative |
Top 10 13F holders, Q2 2026
See all 37 holdersThe largest institutional positions in Rallybio Corp at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| ADAR1 Capital Management, LLC | 926,352 | $14.8M | 0.70% | +905,817+4,411.1% | Added |
| FMR LLC | 794,720 | $12.7M | 0.00% | +1,269+0.2% | Added |
| Viking Global Investors LPSuperinvestorViking Global Investors | 524,347 | $8.39M | 0.02% | 00.0% | Unchanged |
| TPG GP A, LLC | 378,551 | $6.06M | 0.12% | 00.0% | Unchanged |
| Pivotal bioVenture Partners Investment Advisor LLC | 300,579 | $4.81M | 1.56% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 199,907 | $3.20M | 0.00% | +43,380+27.7% | Added |
| Nantahala Capital Management, LLC | 188,422 | $3.01M | 0.18% | −112,213−37.3% | Reduced |
| Vanguard Capital Management LLC | 172,497 | $2.76M | 0.00% | +60,457+54.0% | Added |
| Almitas Capital LLC | 120,682 | $1.93M | 0.46% | −70,524−36.9% | Reduced |
| Rangeley Capital, LLC | 104,850 | $1.68M | 1.64% | +74,720+248.0% | Added |
Holders of 5% or more of RLYB
See all 5 holders and filingsHolders whose latest Schedule 13D or 13G filing reports 5% or more of Rallybio Corp.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| ADAR1 Capital Management, LLC | 13G | 17.50%926.4K shares | New | Jun 5, 20261 filing | Jun 5, 2026 | SEC |
| FMR LLC | 13G/A | 15.00%794.7K shares | +4.40 ppfrom 10.60% | Mar 6, 20263 filings | Aug 6, 2026 | SEC |
| Viking Global Investors LPSuperinvestorViking Global Investors | 13G/A | 9.99%4.22M shares | – | Aug 9, 20214 filings | Feb 17, 2026 | SEC |
| Viking Global Investors LPSuperinvestorViking Global Investors | 13G/A | 9.99%529.0K shares | – | May 15, 20261 filing | May 15, 2026 | SEC |
| TPG GP A, LLC | 13D/A | 7.20%378.6K shares | – | Jan 18, 20222 filings | Mar 3, 2026 | SEC |