Comparable stake leader
ADAR1 Capital Management, LLC
SEC ownership of Rallybio Corp
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001739410.
Disclosed value leader
5AM Opportunities I, L.P.
Comparable rows
41/50
Latest evidence
06 Oct 2026
- Public ticker
- RLYB on Nasdaq
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
ADAR1 Capital Management, LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
41 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
ADAR1 Capital Management, LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
06 Oct 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001739410
- Issuer location
- New Haven, CT
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Rallybio Corp (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
ADAR1 Capital Management,...
Disclosed value leader
5AM Opportunities I, L.P.
Comparable rows
41/50
Latest evidence
06 Oct 2026
13F
13D/G
3/4/5
Lead comparable stake: 18%
9 rows are not safely comparable across share classes.
13D/G row: ADAR1 Capital Management, LLC
Showing 1-8 of 50 holder rows.
Quick read
ADAR1 Capital Management, LLC leads the comparable SEC ownership view at 18%.
41 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens ADAR1 Capital Management, LLC's linked filing trail.
Comparable ownership
Top 5
ADAR1 Capital Management, LLC
18%
FMR LLC
15%
VIKING GLOBAL INVESTORS LP
10%
TPG GP A, LLC
7.2%
Nantahala Capital Management, LLC
3.6%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| ADAR1 Capital Management, LLC |
13F
13D/G
3/4/5
Company · 10%+ Owner
|
18%
from 13D/G
|
$14,821,632
926,352 shares
|
— | 30 Jun 2026 |
| FMR LLC |
13D/G
3/4/5
13F
Other*, 10%+ Owner · Company
|
15%
|
$12,715,520
794,720 shares
|
+$3,726,752 | 30 Jun 2026 |
| VIKING GLOBAL INVESTORS LP |
13F
13D/G
3/4/5
Company · 10%+ Owner
|
10%
from 13D/G
|
$8,389,552
524,347 shares
|
— | 30 Jun 2026 |
| TPG GP A, LLC |
13F
13D/G
Company
|
7.2%
from 13D/G
|
$6,056,816
378,551 shares
|
— | 30 Jun 2026 |
| Nantahala Capital Management, LLC |
13D/G
13F
Company
|
3.6%
|
$3,014,752
188,422 shares
|
$0 | 30 Jun 2026 |
| JOHNSON & JOHNSON |
13D/G
|
2.9%
|
$88,683
152,901 shares
|
$0 | 31 Mar 2026 |
| Daniel Schneeberger |
3/4/5
10%+ Owner
|
18%
|
$12,783,657
926,352 shares
|
+$4,229,263 | 18 May 2026 |
| Stephen Uden |
3/4/5
Chief Executive Officer, Director
|
2.2%
|
$2,167,510
115,620 shares
mixed-class rows
|
— | 06 Oct 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$8,458,527.
Buys
$8,458,527
Insiders: 2
Sells
$0
Insiders: 0
Net
+$8,458,527
Shares: +604,946
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 604,946
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 604,946 | 0 | $8,458,527 | $0 | +$8,458,527 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 22 reporting-owner rows connected to Rallybio Corp. Open a relationship link for the CIK-to-CIK filing trail.
Rows
22
Largest Forms 3/4/5 holder
5AM Opportunities I, L.P.
Net 12M change
+$8,458,526
Latest report
06 Oct 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| 5AM Opportunities I, L.P. | 10%+ Owner | $30,591,937 | Mixed | 03 Jun 2022 | ||
| 5AM Partners V, LLC | 10%+ Owner | $29,771,937 | Mixed | 07 Mar 2023 | ||
| 5AM Ventures V, L.P. | 10%+ Owner | $22,833,933 | Mixed | 29 Jul 2021 | ||
| Daniel Schneeberger | 10%+ Owner | $12,783,657 | +$4,229,263 | +49% | Filing P/S | 18 May 2026 |
| ADAR1 Capital Management, LLC | 10%+ Owner | $12,783,657 | +$4,229,263 | +49% | Filing P/S | 18 May 2026 |
| Stephen Uden | Chief Executive Officer, Director | $2,167,510 | Mixed | 06 Oct 2026 | ||
| Jeffrey M. Fryer | Chief Financial Officer & Treasurer | $385,794 | Mixed | 21 Mar 2022 | ||
| Hui Liu | Director | $269,409 | Mixed | 24 Sep 2026 | ||
| Jonathan I. Lieber | Chief Financial Officer | $155,840 | Median | 29 Sep 2026 | ||
| Steven Ryder | Chief Medical Officer | $126,000 | Mixed | 14 Feb 2025 | ||
| FMR LLC | Other*, 10%+ Owner | $122,842 | Market | 04 Mar 2026 | ||
| Helen M. Boudreau | Director | $87,886 | Mixed | 06 Jul 2026 | ||
| Wendy Chung | Director | $86,197 | Mixed | 16 Sep 2026 | ||
| Robert Lorne Hopfner | Director | $80,705 | Mixed | 13 May 2025 | ||
| Martin Mackay | Director | $64,998 | Mixed | 18 Feb 2026 | ||
| Ronald Hunt | Director | $51,498 | Mixed | 18 Feb 2026 | ||
| Christine A. Nash | Director | $29,205 | Mixed | 13 May 2025 | ||
| Paula Soteropoulos | Director | $29,205 | Mixed | 13 May 2025 | ||
| Kush Parmar | Director | $29,205 | Mixed | 15 May 2024 | ||
| Timothy M. Shannon | Director | $10,693 | Mixed | 03 Jan 2022 |
Recent insider transactions for Rallybio Corp
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Stephen Uden | RLYB | Common Stock | Options Exercise | 24.1% | 22,456 | 115,620 | 06 Oct 2026 | Direct | ||
| Stephen Uden | RLYB | Option (Right to Buy) | Options Exercise | -100% | -22,456 | 0 | 06 Oct 2026 | Direct | ||
| Jonathan I. Lieber | RLYB | Common Stock | Options Exercise | 105.5% | 5,000 | 9,740 | 29 Sep 2026 | Direct | ||
| Jonathan I. Lieber | RLYB | Option (Right to Buy) | Options Exercise | -100% | -5,000 | 0 | 29 Sep 2026 | Direct | ||
| Hui Liu | RLYB | Common Stock | Options Exercise | 12,044 | 12,044 | 24 Sep 2026 | Direct | |||
| Hui Liu | RLYB | Option (Right to Buy) | Options Exercise | -100% | -12,044 | 0 | 24 Sep 2026 | Direct | ||
| Wendy Chung | RLYB | Common Stock | Options Exercise | 3,562 | 3,562 | 16 Sep 2026 | Direct | |||
| Wendy Chung | RLYB | Option (Right to Buy) | Options Exercise | -100% | -3,562 | 0 | 16 Sep 2026 | Direct | ||
| Helen M. Boudreau | RLYB | Common Stock | Options Exercise | 119.5% | 3,562 | 6,542 | 06 Jul 2026 | Direct | ||
| Helen M. Boudreau | RLYB | Option (Right to Buy) | Options Exercise | -100% | -3,562 | 0 | 06 Jul 2026 | Direct | ||
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 1.11% | $142,582 | $13.98 | 10,200 | 926,352 | 19 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 1.11% | $142,582 | $13.98 | 10,200 | 926,352 | 19 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 0.66% | $83,981 | $13.98 | 6,009 | 916,152 | 18 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 0.66% | $83,981 | $13.98 | 6,009 | 916,152 | 18 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 0.03% | $4,170 | $13.90 | 300 | 910,143 | 15 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 0.03% | $4,170 | $13.90 | 300 | 910,143 | 15 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 9.54% | $1,108,807 | $13.99 | 79,259 | 909,843 | 13 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 9.54% | $1,108,807 | $13.99 | 79,259 | 909,843 | 13 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 0.1% | $11,063 | $13.83 | 800 | 830,584 | 12 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 0.1% | $11,063 | $13.83 | 800 | 830,584 | 12 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 6.41% | $699,992 | $14.00 | 50,000 | 829,784 | 11 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 6.41% | $699,992 | $14.00 | 50,000 | 829,784 | 11 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 4.71% | $491,260 | $14.00 | 35,101 | 779,784 | 05 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 4.71% | $491,260 | $14.00 | 35,101 | 779,784 | 05 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 19.4% | $1,687,409 | $13.97 | 120,804 | 744,683 | 04 May 2026 | See Footnote |
| ADAR1 Capital Management, LLC | RLYB | Common Stock | Purchase | 19.4% | $1,687,409 | $13.97 | 120,804 | 744,683 | 04 May 2026 | See Footnote |
| Jonathan I. Lieber | RLYB | Common Stock | Sale | -16.1% | -789 | 4,115 | 23 Feb 2026 | Direct | ||
| Jonathan I. Lieber | RLYB | Common Stock | Award | 104% | 2,500 | 4,904 | 18 Feb 2026 | Direct | ||
| Martin Mackay | RLYB | Option (Right to Buy) | Award | 18,055 | 18,055 | 18 Feb 2026 | Direct | |||
| Ronald Hunt | RLYB | Option (Right to Buy) | Award | 14,305 | 14,305 | 18 Feb 2026 | Direct |
* marks a reported price that did not pass the local price check.