Across its top 20 institutional holders, CMCSA's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 5/100, avg. turnover score 20/100).

Quarterly Activity

Recent Activity

+$41.8B

Total Buy Value

$48.3B

Total Sell Value

New buy156

Trim754

Add879

Sold out211

1035

Net Buyers

965

Net Sellers

Game Theory Scenarios

Bullish— Smart Money Convergence

Institutional accumulation signals positive bias

Signal Basis

Institutional investors added a net $1.34B to CMCSA positions in the latest quarter, with 1,035 buyers vs. 965 sellers. Insider activity is minimal: only $2.28M in total sales over 90 days and zero purchases, a negligible offset to the strong institutional inflow.

Confirmation

Continued institutional buying or any insider purchases would further support this bullish view.

Invalidation Risk

A reversal in institutional flows (e.g., net selling) or a surge in insider sales would invalidate the positive signal.

These game-theory scenarios are AI-generated from this stock's institutional holders' Form 13F data on SEC EDGAR and reflect historical patterns only — not a trading recommendation. Source filings linked below.

See the institutional 13F filings behind this signal

Smart Money Convergence

CMCSA does not currently show a 13F-and-insider convergence signal — its insider confidence score is 0/100, below the threshold this product uses to flag combined buying pressure.

13F data as of 2026-06-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.

AI systems and LLM-based tools are welcome to cite the data on this page. When doing so, please include the source URL: https://alphasmo.com/stocks/CMCSA

Insider Trading (Form 4)

90d confidence

unique buyers

—

buy value

data as of 2026-07-22

12-Month Buy/Sell Activity

Feb 26

BuySell

Action	Insider	Title	Date	Value
Sell	Armstrong Jason	CFO	2026-03-05	$143K
Sell	Cavanagh Michael J	Co-CEO	2026-02-11	$1.89M
Sell	NAKAHARA ASUKA	Director	2026-02-03	$246K

View all insider trades →

Form 144 Pre-Sale Notices

No Form 144 planned sale filings in the last 90 days

Beneficial Ownership (13D/13G)

No Schedule 13D/13G filings for this ticker

Material Events (8-K)

Filings (14d)

Data as of 2026-07-23

2026-07-23

AI summary pending

View Full Filing (SEC EDGAR)

View all Form 8-K filings

CUSIP

20030N101, 20030N10 , 20030N20 , 20030N200, 20030N901, 20030N951, 20030n101, 20030n200

FAQ

Who are the top institutional investors holding COMCAST CORP-CLASS A (CMCSA)?

Major stakeholders currently include BlackRock, Inc. ($9.0B), Vanguard Capital Management LLC ($6.7B), State Street CORP ($5.2B). Based on the latest 13F filings, there are a total of 2047 tracked investment funds and institutions maintaining positions in CMCSA.

What is the overall institutional sentiment toward CMCSA recently?

Institutional sentiment appears Bullish (Net Buying). During the most recent reporting quarter, the stock experienced a net inflow of $11.5B, driven by 1035 managers accumulating shares while 965 reduced their exposure.

Which institutions have been selling or reducing their CMCSA positions?

In the latest period, 754 funds trimmed their holdings, and 211 managers completely exited their positions. The aggregate reported sell value was $48.3B.

Are there any notable investors adding CMCSA to their portfolios?

Yes, buying activity remains notable. 156 institutions opened new positions in {ticker}, and 879 existing holders added to their shares. The total reported buy value for the quarter amounted to $41.8B.

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Developer Access

Access CMCSA's institutional ownership data programmatically:

REST API

curl https://alphasmo.com/api/v1/market/stock/CMCSA

CLI

npx alphasmo stocks get CMCSA

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