SEC Form 4
Caribou Biosciences, Inc. (CRBU) insider trading
In the 12 months to Oct 26, 2026, one CRBU insider reported open-market sales of $12.0K across 1 filing; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $12.0K
- 1 filing · 1 insider
- Open-market purchases
- $0
- 0 filings
Who traded CRBU, and when
- Sale
CRBU daily close from Oct 27, 2025 to Oct 26, 2026, between $0.46 and $2.47, last $0.49. 1 sale and 0 purchase filings by 1 insider, marked at their filing dates. Timothy P. Kelly, Chief Technology Officer: sold $12.0K across 1 filing, first filed Feb 27, 2026, last Feb 27, 2026.
Largest mark · tap a row for others
Timothy P. Kelly · Chief Technology Officer
Sale $12,020
6,228 shares at $1.93 avg
Filed Feb 27, 2026 · traded Feb 25
Close on filing date $1.90
Timothy P. Kelly · Chief Technology Officer
Chief Technology Officer
$12.0K soldOpen-market trades
1 filing in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Timothy P. Kelly | Chief Technology Officer | $12.0K | — | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Timothy P. Kelly Chief Technology Officer | Sale | 6,228 | $1.93 | $12.0K | 73,125 |
GET /stocks/filings/vX/form-4?tickers=CRBU&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"CRBU"
],
"issuer_cik": "0001619856",
"owner_cik": "0001754067",
"accession_number": "0001754067-26-000004",
"form_type": "4",
"filing_date": "2026-02-27",
"period_of_report": "2026-02-25",
"issuer_name": "Caribou Biosciences, Inc.",
"issuer_trading_symbol": "CRBU",
"owner_name": "Kelly Timothy P",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Technology Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-02-25",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 6228,
"transaction_price_per_share": 1.93,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 73125,
"transaction_value": 12020.039999999999,
"not_subject_to_section_16": false,
"direct_or_indirect": "D"
}
]
}
// trimmed to 1 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) · 10 records
- Tax withholding (sold to cover)4 records
- Grants and awards6 records
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.
Frequently asked questions
Has Caribou Biosciences, Inc.'s CEO sold stock?
No. Rachel E. Haurwitz (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is CRBU’s insider data?
These are CRBU 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 CRBU 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 CRBU 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.
Nothing on this page is investment advice. All data and content is provided for informational purposes under our Terms of Service.