Comcast Corporation - Class A (CMCSA)
CMCSA moved a median of +0.01% 30 minutes after news, and +0.01% by the close. How CMCSA actually reacts to news — the realized, point-in-time move the market made, measured across 908 labeled events over the last three years with zero look-ahead.
CMCSA’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 50% | 905 |
| 30-min | +0.01% | 50% | 905 |
| 60-min | +0.01% | 50% | 905 |
| to close | +0.01% | 50% | 896 |
| Middle 50% of CMCSA reactions | -0.26% to +0.45% |
|---|---|
| Median reaction (30-min) | +0.01% |
| Measured reactions | 908 |
Half of all Comcast Corporation - Class A news events land between -0.26% and +0.45% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How CMCSA reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 31 | +0.07% | 52% | +0.24% |
| Analyst downgrades | 61 | +0.52% | 71% | +0.45% |
| Coverage initiations | 14 | -0.22% | 36% | +1.76% |
| Rating reiterations | 136 | +0.07% | 54% | -0.01% |
| Price-target raises | 23 | -0.06% | 26% | -0.66% |
| Price-target cuts | 79 | 0.00% | 49% | 0.00% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. See how CMCSA ranks against every other measured name →
That’s how CMCSA usually reacts — get an email when it moves on news →Email me when CMCSA moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to CMCSA's baseline. Nothing else.
Recent CMCSA events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Xfinity and Comcast Business High-Speed Internet Now Available to Nearly 2,000 Homes and Businesses in Hardee County, Florida | Press release | Business Wire | -0.02% | +1.89% | |
| 2Gether-International Congratulates PathStrider Mobility Founder Tony Ellis II, Winner of the Summer 2026 MVP Cohort Pitch Competition, Powered by Comcast | Press release | PR Web | -0.12% | +0.68% | |
| Comcast Business 2026 Cybersecurity Threat Report: 79.3 Billion Events Show AI Pressurizing the Threat Landscape | Press release | Business Wire | +0.86% | +0.79% | |
| Comcast Advertising Research Reveals How TV and Streaming Drive Results Across the Buyer Journey | Press release | Business Wire | +0.32% | -0.50% | |
| Comcast Deploys Fiber Sensing Technology to Enhance Network Intelligence and Reliability | Press release | Business Wire | -0.05% | +0.21% | |
| Comcast and Fastly’s New Content Delivery Model Powers Highest Quality Experience for Peacock’s Biggest Live Events | Press release | Business Wire | +0.00% | -0.37% | |
| Comcast Completes Washington County, Pennsylvania Expansion Connecting Thousands to High-Speed Internet for the First Time | Press release | Business Wire | -1.14% | -0.37% | |
| Xfinity and Comcast Business High-Speed Internet Now Available to More Than 2,300 Homes and Businesses in Clay County, Florida | Press release | Business Wire | +0.25% | +0.14% | |
| Xfinity and Comcast Business Reliable, High-Speed Internet Now Available in Milton and New Durham, New Hampshire | Press release | Business Wire | -0.29% | +1.99% | |
| Reliable, High-Speed Internet from Xfinity Now Available in Chanhassen and Nowthen, Minnesota | Press release | Business Wire | +0.00% | +0.48% | |
| FreeWheel Brings Attention, Quality and Emotional Resonance Signals into CTV Buying | Press release | Business Wire | -0.73% | -3.74% | |
| Comcast to Host Third Quarter 2026 Earnings Conference Call | Press release | Business Wire | +0.04% | -0.63% | |
| Universal Ads Brings Creator Content to TV Advertising | Press release | Business Wire | -0.39% | -0.77% | |
| Xfinity and Comcast Business Services Now Available in Beaufort and Edisto, South Carolina | Press release | Business Wire | +0.00% | -1.15% | |
| Comcast and Fastly Partner to Develop Next-Generation Content and Application Delivery Model to Deliver Xfinity Members Faster, More Reliable Streaming | Press release | Business Wire | +0.20% | +2.11% | |
| Comcast Business Opens Its Last-Mile Network to Partner Platforms, Starting with Equinix | Press release | Business Wire | -0.28% | -0.14% | |
| Xfinity and Comcast Business High-Speed Internet Now Available to More Than 2,800 Homes and Businesses in Glades County, Florida | Press release | Business Wire | +0.19% | -5.37% | |
| Xfinity Mobile, Comcast Business Mobile to Offer iPhone Duo, iPhone 18 Pro, and iPhone 18 Pro Max | Press release | Business Wire | +0.20% | +2.11% | |
| Comcast Reaches Construction Milestone in Latest Jackson County Expansion, Bringing Xfinity and Comcast Business Services to More Michigan Residents and Businesses | Press release | Business Wire | +1.13% | +1.32% | |
| Xfinity and Comcast Business High-Speed Internet Now Available in Bloomsbury, New Jersey | Press release | Business Wire | +0.23% | -0.98% | |
| Comcast Breaks Ground to Expand High-Speed Internet to Kamas and Francis, Utah | Press release | Business Wire | +0.32% | -1.03% | |
| Comcast Completes Rural Broadband Expansion Connecting Thousands of Homes and Businesses in Eastern Ohio | Press release | Business Wire | -1.02% | -2.22% | |
| Comcast to Participate in BofA Securities Investor Conference | Press release | Business Wire | -0.30% | +1.20% | |
| Comcast to Participate in Goldman Sachs Investor Conference | Press release | Business Wire | -0.30% | +1.20% | |
| Xfinity and Comcast Business High-Speed Internet Now Available to More Than 1,100 Homes and Businesses in Allen County, Indiana | Press release | Business Wire | -1.02% | -2.22% | |
| Xfinity and Comcast Business Reliable, High-Speed Internet Now Available in Deerfield, New Hampshire | Press release | Business Wire | +0.04% | +0.00% | |
| Xfinity and Comcast Business High-Speed Internet Now Available to More Than 3,300 Homes and Businesses in Columbia County, Florida | Press release | Business Wire | +0.28% | +1.12% | |
| Reliable, High-Speed Internet from Xfinity Now Available in Newfield, Maine | Press release | Business Wire | +0.24% | -0.18% | |
| Comcast Launches Xfinity Shield, Redefining Intelligent Home Protection | Press release | Business Wire | -0.64% | +1.24% | |
| Comcast Business and Colt Technology Services Launch Innovation Lab Program to Automate Global Enterprise Connectivity | Press release | Business Wire | +0.06% | +1.60% | |
| Form EFFECT COMCAST CORP | SEC filing · Form EFFECT | SEC EDGAR | -0.10% | — | |
| Xfinity and Comcast Business High-Speed Internet Now Available to More Than 2,400 Homes and Businesses in Putnam County, Florida | Press release | Business Wire | -0.50% | — | |
| Comcast Business Brings Enhanced Private Wireless Networking to the Corporate Office | Press release | Business Wire | +0.02% | +1.29% | |
| Comcast Completes High-Speed Network Expansion to Waterbury, Bringing Advanced Technology Solutions to Businesses of All Sizes | Press release | Business Wire | -0.47% | +2.22% | |
| Form S-4 COMCAST CORP | SEC filing · Form S-4 | SEC EDGAR | -0.47% | +2.22% | |
| Universal Ads Brings Audience and Mobile Measurement Partners to Premium TV | Press release | Business Wire | +0.17% | -0.92% | |
| Xfinity Powers the Next Generation of Creators With “Best in Class” | Press release | Business Wire | -1.51% | +1.53% | |
| Reliable, High-Speed Internet from Xfinity Coming to Northwood, New Hampshire | Press release | Business Wire | +1.53% | +4.04% | |
| Comcast Declares Quarterly Dividend | Press release | Business Wire | -2.33% | -8.71% | |
| Comcast Reports 2nd Quarter 2026 Results | Press release | Business Wire | -2.33% | -8.71% | |
| Form 10-Q COMCAST CORP For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.36% | -1.81% | |
| Form 8-K COMCAST CORP For: Jul 23 | SEC filing · Form 8-K | SEC EDGAR | -2.33% | -8.71% | |
| Xfinity and Comcast Business High-Speed Internet Now Available to More Than 4,000 Homes and Businesses in Highlands County, Florida | Press release | Business Wire | -1.16% | -0.08% | |
| Xfinity Delivers Reliable, High-Speed Internet to Hancock and Glascock Counties, Georgia | Press release | Business Wire | +0.11% | +1.49% | |
| Xfinity and Comcast Business High-Speed Internet Now Available to More Than 1,500 Homes and Businesses in Flagler Estates | Press release | Business Wire | +0.50% | +0.17% | |
| Comcast Reaches Construction Milestone in Greater Phillipsburg Expansion, Bringing Xfinity and Comcast Business Services to More New Jersey Communities | Press release | Business Wire | -0.36% | -1.97% | |
| Comcast Announces Plans to Separate Media and Technology Businesses Into Two Leading Public Companies | Press release | Business Wire | -5.34% | -9.56% | |
| Form 8-K COMCAST CORP For: Jun 29 | SEC filing · Form 8-K | SEC EDGAR | -5.34% | -9.56% | |
| Comcast Business Strengthens Enterprise Networking Leadership with Top Industry Rankings Across SD-WAN, SASE, and Managed Services | Press release | Business Wire | +0.36% | +1.85% | |
| Claritas and Comcast Advertising Bring Audience Intelligence and Measurement Together to Boost Campaign Performance | Press release | PR Web | -0.66% | -3.16% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the CMCSA section they belong to.
Where else CMCSA is measured.
CMCSA earnings → · Analyst actions → · SEC filings →
Other Communication Services names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| INTELSAT SA (I) | 998 | -0.10% | 45% |
| Partner Communications Company Ltd. - American Depositary Shares, each representing one ordinary share (PTNR) | 995 | 0.00% | 46% |
| T-Mobile US, Inc. (TMUS) | 898 | +0.03% | 53% |
| INTERNET GOLD GOLDEN (IGLD) | 854 | 0.00% | 34% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Communication Services names, measured the same way →
Every ticker we measure the same way24
Apple (AAPL)
How AAPL actually reacts to news, measured.
NVIDIA (NVDA)
How NVDA actually reacts to news, measured.
Tesla (TSLA)
How TSLA actually reacts to news, measured.
Microsoft (MSFT)
How MSFT actually reacts to news, measured.
Advanced Micro Devices (AMD)
How AMD actually reacts to news, measured.
Amazon (AMZN)
How AMZN actually reacts to news, measured.
Alphabet (GOOG)
How GOOG actually reacts to news, measured.
Meta Platforms (META)
How META actually reacts to news, measured.
Broadcom (AVGO)
How AVGO actually reacts to news, measured.
JPMorgan Chase (JPM)
How JPM actually reacts to news, measured.
Visa (V)
How V actually reacts to news, measured.
Walmart (WMT)
How WMT actually reacts to news, measured.
Eli Lilly (LLY)
How LLY actually reacts to news, measured.
UnitedHealth Group (UNH)
How UNH actually reacts to news, measured.
Netflix (NFLX)
How NFLX actually reacts to news, measured.
Johnson & Johnson (JNJ)
How JNJ actually reacts to news, measured.
Exxon Mobil (XOM)
How XOM actually reacts to news, measured.
Home Depot (HD)
How HD actually reacts to news, measured.
Costco (COST)
How COST actually reacts to news, measured.
Mastercard (MA)
How MA actually reacts to news, measured.
Oracle (ORCL)
How ORCL actually reacts to news, measured.
Salesforce (CRM)
How CRM actually reacts to news, measured.
Bank of America (BAC)
How BAC actually reacts to news, measured.
Coca-Cola (KO)
How KO actually reacts to news, measured.
Walt Disney (DIS)
How DIS actually reacts to news, measured.
Browse all tickers
Every name we’ve measured, in one place.
How the numbers are made.
How is Comcast Corporation - Class A's median reaction calculated?
Every labeled CMCSA news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 908 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 50% of CMCSA's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does CMCSA's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.