Comcast insiders sold $2.3M in the past 12 months. How much of their stake is that?

Sold by a charitable foundation the insider reports: Foundation, reported by David Novak. A foundation's shares are not the insider's own stake, so they are left out of the figures above.

Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.

14 of 16 insiders fully reconciled: starting holdings plus reported transactions match ending holdings (6 exactly, 8 with a minor or footnoted difference). For 2 we show sales but not holdings; the ! icon on their rows explains why. Percentages cover 10 of 16 officers and directors. Left out: Brian Roberts (most holdings were last confirmed in 2023); Michael Cavanagh and Jason Armstrong (most of their shares vested during the period, so a percentage would mislead); Thomas Baltimore Jr. and Louise Brady (holdings couldn't be fully reconciled); Gordon Smith (held no vested shares at the start). "Still held" compares ending with starting vested shares; a plus sign means the holding grew.

Officer and director open-market sales: $2.3M across 70,716 shares. Plan status and stated purpose are separate questions, and a sale can have both.

Sales by month

Less than usual: about one-seventh of the 5-year average. 3 insiders sold; the average is 3 a year.

Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.

All 2,201 Forms 3, 4 and 5 filed for Comcast (SEC CIK 1166691) from Nov 18, 2002 to Oct 2, 2026, retrieved from SEC EDGAR on Oct 9, 2026. Prices are the ones reported in each filing, often weighted averages. 31 filings were left out because Comcast filed them as an owner of another company's stock. 54 older filings exist only on paper and could not be read.

Probable 3-for-2 stock split on or before Mar 9, 2007 (first filing that shows post-split balances). Splits aren't reported as transactions; 35 holding lines changed by exactly this ratio, so earlier share counts are restated.

Probable 2-for-1 stock split on or before Mar 1, 2017 (first filing that shows post-split balances). Splits aren't reported as transactions; 25 holding lines changed by exactly this ratio, so earlier share counts are restated.

Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.

Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".

Full methodology