SEC Form 4
Rallybio Corporation (RLYB) insider trading
In the 12 months to Oct 26, 2026, one RLYB insider reported open-market purchases of $4.2M across 4 filings; no open-market sales were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $0
- 0 filings · 0 insiders
- Open-market purchases
- $4.2M
- 4 filings · Daniel Schneeberger, 10% owner
Who traded RLYB, and when
- Purchase
RLYB daily close from Oct 27, 2025 to Oct 26, 2026, between $4.33 and $17.22, last $16.53. 0 sale and 4 purchase filings by 1 insider, marked at their filing dates. Daniel Schneeberger, 10% owner: bought $4.2M across 4 filings, first filed May 6, 2026, last May 20, 2026.
Largest mark · tap a row for others
Daniel Schneeberger · 10% owner
Purchase $2,178,668
155,905 shares at $13.97 avg
Filed May 6, 2026 · traded May 4
Close on filing date $14.56
Daniel Schneeberger · 10% owner
10% owner
$4.2M boughtOpen-market trades
4 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Daniel Schneeberger | 10% owner | — | $4.2M | 4 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Daniel Schneeberger 10% owner | Purchase | 16,209 | $13.98 | $226.6K | 926,352 | |
traded | Daniel Schneeberger 10% owner | Purchase | 79,559 | $13.99 | $1.1M | 909,943 | |
traded | Daniel Schneeberger 10% owner | Purchase | 50,800 | $14.00 | $711.1K | 830,584 | |
traded | Daniel Schneeberger 10% owner | Purchase | 155,905 | $13.97 | $2.2M | 779,784 |
GET /stocks/filings/vX/form-4?tickers=RLYB&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"RLYB"
],
"issuer_cik": "0001739410",
"owner_cik": "0001861120",
"accession_number": "0001104659-26-064729",
"form_type": "4",
"filing_date": "2026-05-20",
"period_of_report": "2026-05-18",
"issuer_name": "Rallybio Corp",
"issuer_trading_symbol": "RLYB",
"owner_name": "Schneeberger Daniel",
"is_director": false,
"is_officer": false,
"is_ten_percent_owner": true,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-05-18",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 6009,
"transaction_price_per_share": 13.9759,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 916152,
"transaction_value": 83981.1831,
"not_subject_to_section_16": false,
"direct_or_indirect": "I",
"nature_of_ownership": "See Footnote",
"footnotes": [
{
"id": "F1",
"description": "The reported price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $13.9100 to $14.0000, inclusive. Each Reporting Person undertakes to provide Rallybio Corp, any security holder of Rallybio Corp or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."
},
{
"id": "F3",
"description": "The reported securities are owned directly by private investment funds managed by ADAR1 Capital Management, LLC and separately managed accounts of ADAR1 Capital Management, LLC, and may be deemed to be indirectly beneficially owned by (i) ADAR1 Capital Management, LLC and (ii) Daniel Schneeberger, the sole manager of ADAR1 Capital Management, LLC."
},
{
"id": "F4",
"description": "For purposes of Section 16 of the Securities Exchange Act of 1934, as amended, each Reporting Person disclaims beneficial ownership of any such securities, except to the extent of his/its pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or otherwise."
}
]
},
{
"tickers": [
"RLYB"
],
"issuer_cik": "0001739410",
"owner_cik": "0001940272",
"accession_number": "0001104659-26-064729",
"form_type": "4",
"filing_date": "2026-05-20",
"period_of_report": "2026-05-18",
"issuer_name": "Rallybio Corp",
"issuer_trading_symbol": "RLYB",
"owner_name": "ADAR1 Capital Management, LLC",
"is_director": false,
"is_officer": false,
"is_ten_percent_owner": true,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-05-19",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 200,
"transaction_price_per_share": 13.8,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 926352,
"transaction_value": 2760,
"not_subject_to_section_16": false,
"direct_or_indirect": "I",
"nature_of_ownership": "See Footnote",
"footnotes": [
{
"id": "F3",
"description": "The reported securities are owned directly by private investment funds managed by ADAR1 Capital Management, LLC and separately managed accounts of ADAR1 Capital Management, LLC, and may be deemed to be indirectly beneficially owned by (i) ADAR1 Capital Management, LLC and (ii) Daniel Schneeberger, the sole manager of ADAR1 Capital Management, LLC."
},
{
"id": "F4",
"description": "For purposes of Section 16 of the Securities Exchange Act of 1934, as amended, each Reporting Person disclaims beneficial ownership of any such securities, except to the extent of his/its pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or otherwise."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 14 records
- Option exercises12 records
- Tax withholding (sold to cover)1 record
- Grants and awards1 record
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
- Counted once
- When several owners (a fund and its partners, say) report the same trade, it's counted once. Corrected filings replace the originals.
Frequently asked questions
Has the Rallybio Corporation's CEO sold stock?
No. Stephen Uden (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is RLYB’s insider data?
These are RLYB Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
Build with AI
Track RLYB insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for RLYB every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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