SEC Form 4
Comcast Corp (CMCSA) insider trading
In the 12 months to Oct 23, 2026, 3 CMCSA insiders reported open-market sales of $2.3M across 3 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $2.3M
- 3 filings · 3 insiders
- Open-market purchases
- $0
- 0 filings
Who traded CMCSA, and when
- Sale
CMCSA daily close from Oct 23, 2025 to Oct 22, 2026, between $20.66 and $32.48, last $22.84. 3 sale and 0 purchase filings by 3 insiders, marked at their filing dates. Michael J. Cavanagh, Co-CEO: sold $1.9M across 1 filing, first filed Feb 13, 2026, last Feb 13, 2026. Asuka Nakahara, Director: sold $245.8K across 1 filing, first filed Feb 4, 2026, last Feb 4, 2026. Jason Armstrong, CFO: sold $142.6K across 1 filing, first filed Mar 6, 2026, last Mar 6, 2026.
Largest mark · tap a row for others
Michael J. Cavanagh · Co-CEO
Sale $1,892,549
57,947 shares at $32.66 avg
Filed Feb 13, 2026 · traded Feb 11
Close on filing date $31.57
Michael J. Cavanagh · Co-CEO
Co-CEO
$1.9M soldAsuka Nakahara · Director
Director
$245.8K soldJason Armstrong · CFO
CFO
$142.6K soldHas Comcast Corp's CEO sold stock?
Yes. Michael J. Cavanagh (CEO) sold 57,947 shares ($1.9M) in Feb 2026. Brian L. Roberts (CEO) made no open-market sales filed as CEO in the last 12 months.
Open-market trades
3 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Michael J. Cavanagh | Co-CEO | $1.9M | — | 1 | — | |
| Asuka Nakahara | Director | $245.8K | — | 1 | — | |
| Jason Armstrong | CFO | $142.6K | — | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Jason Armstrong CFO | Sale | 4,494 | $31.74 | $142.6K | 167,906 | |
traded | Michael J. Cavanagh Co-CEO | Sale | 57,947 | $32.66 | $1.9M | 622,336 | |
traded | Asuka Nakahara Director | Sale | 8,275 | $29.70 | $245.8K | 57,958 |
GET /stocks/filings/vX/form-4?tickers=CMCSA&filing_date.gte=2025-10-23&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"CCZ",
"CMCSA"
],
"issuer_cik": "0001166691",
"owner_cik": "0001958909",
"accession_number": "0001225208-26-003380",
"form_type": "4",
"filing_date": "2026-03-06",
"period_of_report": "2026-03-05",
"issuer_name": "COMCAST CORP",
"issuer_trading_symbol": "CMCSA",
"owner_name": "Armstrong Jason",
"is_officer": true,
"officer_title": "CFO",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Class A Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-03-05",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 4494,
"transaction_price_per_share": 31.735,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 167905.583,
"transaction_value": 142617.09,
"direct_or_indirect": "D"
},
{
"tickers": [
"CCZ",
"CMCSA"
],
"issuer_cik": "0001166691",
"owner_cik": "0001304481",
"accession_number": "0001225208-26-001888",
"form_type": "4",
"filing_date": "2026-02-13",
"period_of_report": "2026-02-11",
"issuer_name": "COMCAST CORP",
"issuer_trading_symbol": "CMCSA",
"owner_name": "Cavanagh Michael J",
"is_director": true,
"is_officer": true,
"officer_title": "Co-CEO",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Class A Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-02-11",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 57947,
"transaction_price_per_share": 32.66,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 622336,
"transaction_value": 1892549.0199999998,
"direct_or_indirect": "I",
"nature_of_ownership": "By Trust"
}
]
}
// 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) · 86 records
- Option exercises23 records
- Tax withholding23 records
- Grants and awards29 records
- Gifts9 records
- Other2 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
Build this yourself
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 CMCSA 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.
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.