Comcast Corporation
MX ˙ BMV ˙ US20030N1019
SecurityMX:CMCSA / Comcast Corporation
InstitutionPrimecap Management Co/ca/
Latest Disclosed Ownership44,800 shares
Latest Disclosed Value $ 1,286,208
Primecap Management Co/ca/ ownership in CMCSA / Comcast Corporation

On May 11, 2026 - Primecap Management Co/ca/ filed a 13F-HR form disclosing ownership of 44,800 shares of Comcast Corporation (MX:CMCSA) valued at $1,286,208 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 44,800 shares of Comcast Corporation. This represents a change in shares of 0.00% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F COMCAST CORP CL A 20030N101 44,800 0 0.00 1,286 -3.96 0.0010
2026-02-11 2025-12-31 13F COMCAST CORP CL A 20030N101 44,800 -137,300 -75.40 1,339 -76.60 0.0010
2025-11-12 2025-09-30 13F COMCAST CORP CL A 20030N101 182,100 -29,200 -13.82 5,722 -24.13 0.0044
2025-08-11 2025-06-30 13F COMCAST CORP CL A 20030N101 211,300 -77,350 -26.80 7,541 -29.20 0.0060
2025-05-09 2025-03-31 13F COMCAST CORP CL A 20030N101 288,650 -57,150 -16.53 10,651 -17.92 0.0088
2025-02-10 2024-12-31 13F COMCAST CORP CL A 20030N101 345,800 0 0.00 12,978 -10.16 0.0101
2024-11-08 2024-09-30 13F COMCAST CORP CL A 20030N101 345,800 0 0.00 14,444 6.67 0.0106
2024-08-09 2024-06-30 13F COMCAST CORP CL A 20030N101 345,800 0 0.00 13,542 -9.67 0.0098
2024-05-14 2024-03-31 13F COMCAST CORP CL A 20030N101 345,800 0 0.00 14,990 -1.14 0.0112
2024-02-09 2023-12-31 13F COMCAST CORP CL A 20030N101 345,800 0 0.00 15,163 -1.10 0.0120
2023-11-13 2023-09-30 13F COMCAST CORP CL A 20030N101 345,800 0 0.00 15,333 6.72 0.0129
2023-08-11 2023-06-30 13F COMCAST CORP CL A 20030N101 345,800 -200 -0.06 14,368 9.54 0.0120
2023-05-15 2023-03-31 13F COMCAST CORP CL A 20030N101 346,000 -58,507 -14.46 13,117 -7.27 0.0114
2023-02-13 2022-12-31 13F COMCAST CORP CL A 20030N101 404,507 0 0.00 14,146 19.23 0.0130
2022-11-14 2022-09-30 13F COMCAST CORP CL A 20030N101 404,507 0 0.00 11,864 -25.26 0.0115
2022-08-11 2022-06-30 13F COMCAST CORP CL A 20030N101 404,507 0 0.00 15,873 -16.19 0.0142
2022-05-11 2022-03-31 13F COMCAST CORP CL A 20030N101 404,507 -140,000 -25.71 18,939 -30.89 0.0143
2022-02-11 2021-12-31 13F COMCAST CORP CL A 20030N101 544,507 -326,200 -37.46 27,405 -43.73 0.0190
2021-11-12 2021-09-30 13F COMCAST CORP CL A 20030N101 870,707 46,400 5.63 48,699 3.61 0.0344
2021-08-10 2021-06-30 13F COMCAST CORP CL A 20030N101 824,307 -118,400 -12.56 47,002 -7.86 0.0316
2021-05-14 2021-03-31 13F COMCAST CORP CL A 20030N101 942,707 -45,695 -4.62 51,010 -1.51 0.0356
2021-02-08 2020-12-31 13F COMCAST CORP CL A 20030N101 988,402 5,300 0.54 51,792 13.88 0.0385
2020-11-13 2020-09-30 13F COMCAST CORP- COM 20030N101 983,102 26,260 2.74 45,478 21.93 0.0375
2020-08-13 2020-06-30 13F COMCAST CORP- COM 20030N101 956,842 -711,758 -42.66 37,298 -34.98 0.0320
2020-05-14 2020-03-31 13F COMCAST CORP CABLE COM 20030N101 1,668,600 -160,300 -8.76 57,366 -30.25 0.0563
2020-02-14 2019-12-31 13F COMCAST CORP CABLE COM 20030N101 1,828,900 120,000 7.02 82,246 6.76 0.0596
2019-11-13 2019-09-30 13F COMCAST CORP CABLE COM 20030N101 1,708,900 15,000 0.89 77,037 7.57 0.0616
2019-08-14 2019-06-30 13F COMCAST CORP CABLE COM 20030N101 1,693,900 -1,030,200 -37.82 71,618 -34.24 0.0530
2019-05-14 2019-03-31 13F COMCAST CORP CABLE COM 20030N101 2,724,100 0 0.00 108,910 17.42 0.0802
2019-02-12 2018-12-31 13F COMCAST CORP CABLE COM 20030N101 2,724,100 -162,900 -5.64 92,756 -9.27 0.0752
2018-11-13 2018-09-30 13F COMCAST CORP CABLE COM 20030N101 2,887,000 0 0.00 102,229 7.93 0.0690
2018-08-13 2018-06-30 13F COMCAST CORP CABLE COM 20030N101 2,887,000 9,000 0.31 94,722 -3.68 0.0702
2018-05-14 2018-03-31 13F COMCAST CORP CABLE COM 20030N101 2,878,000 0 0.00 98,341 -14.68 0.0738
2018-02-13 2017-12-31 13F COMCAST CORP CABLE COM 20030N101 2,878,000 36,300 1.28 115,264 5.41 0.0885
2017-11-13 2017-09-30 13F COMCAST CORP CABLE COM 20030N101 2,841,700 239,400 9.20 109,349 7.96 0.0905
2017-08-11 2017-06-30 13F COMCAST CORP CABLE COM 20030N101 2,602,300 312,700 13.66 101,282 17.68 0.0870
2017-05-12 2017-03-31 13F COMCAST CORP CABLE COM 20030N101 2,289,600 1,144,800 100.00 86,066 8.88 0.0781
2017-02-13 2016-12-31 13F COMCAST CORP CABLE COM 20030N101 1,144,800 49,600 4.53 79,048 8.80 0.0778
2016-11-14 2016-09-30 13F COMCAST CORP CABLE COM 20030N101 1,095,200 747,833 215.29 72,656 220.85 0.0725
2016-08-12 2016-06-30 13F COMCAST CORP CABLE COM 20030N101 347,367 3,400 0.99 22,645 7.78 0.0241
2016-05-12 2016-03-31 13F COMCAST CORP CABLE COM 20030N101 343,967 150,967 78.22 21,010 92.91 0.0218
2016-02-12 2015-12-31 13F COMCAST CORP CABLE COM 20030N101 193,000 16,500 9.35 10,891 8.49 0.0111
2015-11-12 2015-09-30 13F COMCAST CORP CABLE COM 20030N101 176,500 176,500 10,039 0.0111
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.