Communication Services groups telecom, media, and internet-platform companies under one industry-group label. A phone carrier and a social platform can share the sector while running very different businesses. Combined size is not a sector return. See how the ranking works.
102 U.S.-listed Communication Services companies with a market cap of at least $1B are ranked here by market capitalization, worth a combined $8.36T — 8.28% of the total market tracked on MarketCapLens. The most valuable is Alphabet Inc. at $4.22T. As of September 22, 2026. Size ranking for research, not a sector recommendation.
| Industry | Companies | Combined cap | % of sector |
|---|---|---|---|
| Internet Content & Information | 25 | $6.44T | 77.01% |
| Telecommunications Services | 39 | $1.04T | 12.40% |
| Entertainment | 21 | $782.76B | 9.36% |
| Advertising Agencies | 9 | $47.32B | 0.57% |
| Publishing | 4 | $39.09B | 0.47% |
| Broadcasting | 4 | $16.17B |
The largest company, Alphabet Inc. (GOOG), is 50.43% of Communication Services. The three largest — Alphabet Inc. (GOOG), Meta Platforms, Inc. (META), and Netflix, Inc. (NFLX) — are 76.47% of the sector. The ten largest are 88.27%. Alphabet Inc. is classified as Internet Content & Information, which is also the largest industry in this sector by combined cap. Magnificent 7 companies in this sector: Alphabet Inc. (GOOG) and Meta Platforms, Inc. (META).
| Weight |
|---|
| 2 | Meta Platforms, Inc.META | $1.88T | $736.60 | -0.63% | 27.92M | 22.44% |
| 1 | Alphabet Inc.GOOG | $4.22T | $347.41 | -0.99% | 19.63M | 50.43% |
| 0.19% |
Industry rows usually split telecom, entertainment, and interactive media. Combined market cap is listed equity, not subscriber growth or ad revenue, and it is not a sector return.