Comcast (CMCSA) insider buying and selling
Every Table I transaction reported by directors and officers of S&P 500 companies on SEC Form 4 filings (2 business days to file): each row labeled with its official transaction code, nothing filtered out beforehand.
Open-market purchases (code P) are the rare signal, in green; sales (code S) are common and often pre-scheduled (10b5-1). Table II (derivatives) is not included: its prices are exercise prices, not market values. Guide: insider buying.
| Date | Ticker | Insider | Role | Shares | Price | Amount | % of stake | Type / filing |
|---|
Download these transactions as CSV No account, no sign-up. The data is public: it comes from SEC Form 4 filings.
Comcast Corporation (CMCSA) insider buying and selling: no purchases, 3 sales
77 Form 4 Table I transactions filed with the SEC by Comcast Corporation insiders between 2025-10-02 and 2026-10-02 (15-month history): 0 open-market purchases and 3 sales, plus 74 transactions under other Form 4 codes, broken down one by one below. The largest open-market trade is a sale of $1.9M by Cavanagh Michael J on 2026-02-11.
Comcast insider buying and selling over the last 12 months
Between Oct 21, 2025 and Oct 20, 2026, Comcast insiders filed 3 sales worth $2.3M on the open market, and no purchases.
The biggest seller was Cavanagh Michael J (Co-CEO): $1.9M in 1 sale, out of 3 different sellers.
The largest trade of the period was a sale of $1.9M on Feb 11, 2026, by Cavanagh Michael J (Co-CEO). Form 4 on sec.gov (0001225208-26-001888).
None of the 3 sales carries the 10b5-1 plan flag on the Form 4 (sales scheduled months ahead).
The latest sale from Mar 5, 2026.
Against its sector (Communication Services, 19 companies with an insider page on this site), over the same dates the median is 12 sales and 0 purchases on the open market. Comcast has more sales than 3 of the other 18, ranks 15 of 19 by net dollars sold, and 8 of the 19 have at least one purchase.
The 20 most important trades
With no open-market purchases, the table starts with CMCSA's sales, largest first. The full history is in the tool above, already searched.
See all 77 CMCSA trades in the full history →
| Trade date | Filed | Insider | Role | Amount | Code | Filing |
|---|---|---|---|---|---|---|
| 2026-02-11 | 2026-02-13 | Cavanagh Michael J | Co-CEO | $1.9M | S — Open-market sale Indirect holding, through: By Trust | SEC |
| 2026-02-03 | 2026-02-04 | Nakahara Asuka | Director | $246k | S — Open-market sale | SEC |
| 2026-03-05 | 2026-03-06 | Armstrong Jason | CFO | $143k | S — Open-market sale | SEC |
| 2026-02-11 | 2026-02-13 | Roberts Brian L | Chairman of Board & Co-CEO | $29.7M | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-02-11 | 2026-02-13 | Roberts Brian L | Chairman of Board & Co-CEO | $27.9M | M — Option exercise | SEC |
| 2026-02-11 | 2026-02-13 | Cavanagh Michael J | Co-CEO | $22.2M | F — Tax withholding (shares surrendered for taxes) Indirect holding, through: By Trust | SEC |
| 2026-02-11 | 2026-02-13 | Cavanagh Michael J | Co-CEO | $20.9M | M — Option exercise Indirect holding, through: By Trust | SEC |
| 2026-03-05 | 2026-03-06 | Armstrong Jason | CFO | $2.2M | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-03-05 | 2026-03-06 | Armstrong Jason | CFO | $2.1M | M — Option exercise | SEC |
| 2026-03-01 | 2026-03-03 | Reid Thomas J. | Chief Legal Officer, Secretary | $1.5M | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-03-01 | 2026-03-03 | Armstrong Jason | CFO | $1.5M | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-03-01 | 2026-03-03 | Roberts Brian L | Chairman of Board & Co-CEO | $1.4M | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-03-01 | 2026-03-03 | Cavanagh Michael J | Co-CEO | $1.1M | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-03-17 | 2026-03-18 | Khoury Jennifer | Chief Communications Officer | $316k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-03-17 | 2026-03-18 | Khoury Jennifer | Chief Communications Officer | $308k | M — Option exercise | SEC |
| 2026-03-01 | 2026-03-03 | Khoury Jennifer | Chief Communications Officer | $189k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-01-20 | 2026-01-22 | Reid Thomas J. | Chief Legal Officer, Secretary | $131k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-01-20 | 2026-01-22 | Armstrong Jason | CFO | $112k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-03-01 | 2026-03-03 | Murdock Daniel C. | EVP & Chief Accounting Officer | $102k | F — Tax withholding (shares surrendered for taxes) | SEC |
| 2026-04-03 | 2026-04-03 | Murdock Daniel C. | EVP & Chief Accounting Officer | $58k | F — Tax withholding (shares surrendered for taxes) | SEC |
The period balance: money in, money out
In the Form 4 filings submitted between Oct 2, 2025 and Oct 2, 2026 there is not one open-market purchase of Comcast Corporation: 3 sales worth $2.3M and zero dollars bought.
Only codes P and S count, where an insider puts in or takes out their own money. A selling balance like Comcast Corporation's is the norm in the S&P 500, where much of the pay comes as stock. It is not a recommendation to buy or sell: it is what was filed.
Every transaction, code by code
| Code | What it means | Trades | Reported amount |
|---|---|---|---|
| A | Grant or award | 34 | $0 |
| F | Tax withholding (shares surrendered for taxes) | 15 | $60.4M |
| M | Option exercise | 15 | $51.2M |
| G | Gift | 8 | $0 |
| S | Open-market sale | 3 | $2.3M |
| J | Other transaction (explained in the filing) | 2 | $0 |
| Total | Everything filed in the period | 77 | $113.9M |
55 of the 77 rows carry no usable amount on the Form 4: they count as trades and add $0. The code labels come from the SEC index.
Who has traded
Over the 15 months of history, 16 distinct people or entities have filed Comcast Corporation transactions: none bought on the open market and 3 sold. Counted by CIK, the fixed number the SEC gives each filer, and not by name, which each filer types their own way.
| Filer | Role | Transactions | Bought (count) | Sold (count) | Last filed |
|---|---|---|---|---|---|
| Cavanagh Michael J | Co-CEO | 5 | — | $1.9M (1) | 2026-03-03 |
| Nakahara Asuka | Director | 2 | — | $246k (1) | 2026-02-04 |
| Armstrong Jason | CFO | 7 | — | $143k (1) | 2026-03-06 |
| Roberts Brian L | Chairman of Board & Co-CEO | 11 | — | — | 2026-09-03 |
| Breen Edward D | Director | 9 | — | — | 2026-10-02 |
| Baltimore Thomas J Jr | Director | 6 | — | — | 2026-10-02 |
| Brady Louise F. | Director | 6 | — | — | 2026-10-02 |
| Honickman Jeffrey A | Director | 6 | — | — | 2026-10-02 |
Shown here are the 8 who moved the most money, out of 16. The rest are in the full history, one link above. The name links to all their trades, in any company. "Transactions" counts any code; the money, open market only. Role: from their latest filing.
Month by month
By the month the trade was executed, not the month it was filed; months with no trades show zero. The busiest month was Feb 2026: 0 purchases and 2 sales, worth $2.1M. 13 of the 15 months have none.
| Month | Purchases | Amount | Sales | Amount |
|---|---|---|---|---|
| Aug 2025 | 0 | $0 | 0 | $0 |
| Sep 2025 | 0 | $0 | 0 | $0 |
| Oct 2025 | 0 | $0 | 0 | $0 |
| Nov 2025 | 0 | $0 | 0 | $0 |
| Dec 2025 | 0 | $0 | 0 | $0 |
| Jan 2026 | 0 | $0 | 0 | $0 |
| Feb 2026 | 0 | $0 | 2 | $2.1M |
| Mar 2026 | 0 | $0 | 1 | $143k |
| Apr 2026 | 0 | $0 | 0 | $0 |
| May 2026 | 0 | $0 | 0 | $0 |
| Jun 2026 | 0 | $0 | 0 | $0 |
| Jul 2026 | 0 | $0 | 0 | $0 |
| Aug 2026 | 0 | $0 | 0 | $0 |
| Sep 2026 | 0 | $0 | 0 | $0 |
| Oct 2026 | 0 | $0 | 0 | $0 |
The last month may be partial: a Form 4 is filed up to two business days later. The table does not say whether the pattern is good or bad; it says when it happened.
Comcast Corporation (CMCSA) analysis page →
Other Communication Services companies with insider trades
All 500 are listed in the section index →
Which insiders are buying their own company stock →
How to read this data
None of the 3 sales in the table is flagged as scheduled (10b5-1 plan), the kind signed months ahead and executed automatically. Comcast has no open-market purchase (code P) in the history, the most common case in the S&P 500: insiders are already paid in stock. The latest filing is from Oct 2, 2026, and a Form 4 arrives up to two business days after the trade.
Guide: Insider buying · all guides
What is behind these trades
The concepts on this page, explained from scratch in the Academy. Free, no account.
- What the efficiency hypothesis says and what it does NOT sayIf an insider's purchase is public and anyone can read it, is there any information left in it? That is the exact question that brings people here.
- Who really moves the market: the types of investorWho sits on the other side of each order, and where a company's own insiders fit among them.
- Supply, demand and price: why it rises and falls constantlyHow a piece of news ends up inside the price, and why the reaction to a filed sale is rarely the one you would expect.
Source: SEC EDGAR Form 4. This is a list of public facts, not financial advice or a recommendation to buy or sell.