Comcast Corporation
MX ˙ BMV ˙ US20030N1019
SecurityMX:CMCSA / Comcast Corporation
InstitutionBoston Research & Management Inc
Latest Disclosed Ownership122,976 shares
Latest Disclosed Value $ 3,530
Boston Research & Management Inc reports 26.82% increase in ownership of CMCSA / Comcast Corporation

On April 10, 2026 - Boston Research & Management Inc filed a 13F-HR form disclosing ownership of 122,976 shares of Comcast Corporation (MX:CMCSA) valued at $3,530 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 96,971 shares of Comcast Corporation. This represents a change in shares of 26.82% 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)
2026-04-10 2026-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 122,976 26,005 26.82 4 50.00 0.8385
2026-02-11 2025-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 96,971 -42,895 -30.67 3 -50.00 0.6682
2025-11-12 2025-09-30 13F Comcast Corp Cl A Vtg COM 20030N101 139,866 2,851 2.08 4 0.00 0.9692
2025-08-12 2025-06-30 13F Comcast Corp Cl A Vtg COM 20030N101 137,015 4,441 3.35 5 0.00 1.1688
2025-05-12 2025-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 132,574 751 0.57 5 0.00 1.2146
2025-02-12 2024-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 131,823 -155 -0.12 5 -20.00 1.2144
2024-11-12 2024-09-30 13F Comcast Corp Cl A Vtg COM 20030N101 131,978 2,510 1.94 6 0.00 1.2949
2024-08-13 2024-06-30 13F Comcast Corp Cl A Vtg COM 20030N101 129,468 2,780 2.19 5 0.00 1.2818
2024-05-14 2024-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 126,688 1,485 1.19 5 0.00 1.3572
2024-02-12 2023-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 125,203 4,332 3.58 5 0.00 1.4575
2023-11-13 2023-09-30 13F Comcast Corp Cl A Vtg COM 20030N101 120,871 515 0.43 5 0.00 1.5840
2023-08-01 2023-06-30 13F Comcast Corp Cl A Vtg COM 20030N101 120,356 251 0.21 5 25.00 1.4158
2023-05-10 2023-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 120,105 3,617 3.11 5 0.00 1.3598
2023-02-13 2022-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 116,488 -833 -0.71 4 -99.88 1.2603
2022-11-14 2022-09-30 13F Comcast Corp Cl A Vtg COM 20030N101 117,321 8,370 7.68 3,441 -19.51 1.1723
2022-08-11 2022-06-30 13F Comcast Corp Cl A Vtg COM 20030N101 108,951 2,190 2.05 4,275 -14.47 1.3847
2022-05-12 2022-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 106,761 1,634 1.55 4,998 -5.54 1.4509
2022-02-10 2021-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 105,127 -125 -0.12 5,291 -10.11 1.4446
2021-11-10 2021-09-30 13F/A-1 Comcast Corp Cl A Vtg COM 20030N101 105,252 -325 -0.31 5,886 -2.23 1.7529
2021-11-10 2021-09-30 13F Comcast Corp Cl A Vtg COM 20030N101 105,152 -425 5,689 1.8313
2021-08-11 2021-06-30 13F Comcast Corp Cl A Vtg COM 20030N101 105,577 425 0.40 6,020 5.82 1.8261
2021-05-11 2021-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 105,152 1,017 0.98 5,689 4.27 1.8313
2021-02-09 2020-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 104,135 1,640 1.60 5,456 15.08 1.8981
2020-11-09 2020-09-30 13F Comcast Corp Cl A Vtg COM 20030N101 102,495 -2,947 -2.79 4,741 15.35 1.8540
2020-08-10 2020-06-30 13F Comcast Corp Cl A Vtg COM 20030N101 105,442 2,313 2.24 4,110 15.94 1.7076
2020-05-08 2020-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 103,129 -2,221 -2.11 3,545 -25.16 1.7798
2020-02-07 2019-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 105,350 -220 -0.21 4,737 -0.46 1.7770
2019-11-12 2019-09-30 13F Comcast Corp Cl A Vtg COM 20030N101 105,570 420 0.40 4,759 7.06 1.8819
2019-08-07 2019-06-30 13F Comcast Corp Cl A Vtg COM 20030N101 105,150 -710 -0.67 4,445 5.03 1.7979
2019-05-07 2019-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 105,860 -1,135 -1.06 4,232 16.17 1.7633
2019-02-06 2018-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 106,995 15,630 17.11 3,643 12.61 1.7346
2018-11-13 2018-09-30 13F Comcast Corp Cl A Vtg COM 20030N101 91,365 -2,685 -2.85 3,235 4.86 1.4782
2018-07-30 2018-06-30 13F Comcast Corp Cl A Vtg COM 20030N101 94,050 6,885 7.90 3,085 3.59 1.5182
2018-05-09 2018-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 87,165 4,330 5.23 2,978 -10.22 1.5174
2018-02-09 2017-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 82,835 -2,160 -2.54 3,317 1.44 1.6633
2017-11-09 2017-09-30 13F Comcast Corp Cl A Vtg COM 20030N101 84,995 1,089 1.30 3,270 0.15 1.6711
2017-08-08 2017-06-30 13F Comcast Corp Cl A Vtg COM 20030N101 83,906 -2,930 -3.37 3,265 0.03 1.7663
2017-05-05 2017-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 86,836 42,768 97.05 3,264 7.30 1.7782
2017-02-09 2016-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 44,068 -25 -0.06 3,042 4.00 1.7306
2016-11-07 2016-09-30 13F Comcast Corp Cl A Vtg COM 20030N101 44,093 120 0.27 2,925 2.06 1.6897
2016-08-10 2016-06-30 13F Comcast Corp Cl A Vtg COM 20030N101 43,973 870 2.02 2,866 8.89 1.7377
2016-05-13 2016-03-31 13F Comcast Corp Cl A Vtg COM 20030N101 43,103 1,245 2.97 2,632 11.43 1.6389
2016-02-11 2015-12-31 13F Comcast Corp Cl A Vtg COM 20030N101 41,858 3,550 9.27 2,362 7.76 1.4686
2015-11-09 2015-09-30 13F Comcast COM 20030N200 38,308 270 0.71 2,192 -3.82 1.4429
2015-07-31 2015-06-30 13F Comcast COM 20030N200 38,038 -530 -1.37 2,279 5.41 1.4426
2015-05-11 2015-03-31 13F Comcast COM 20030N200 38,568 1,955 5.34 2,162 2.61 1.3713
2015-02-11 2014-12-31 13F Comcast COM 20030N200 36,613 540 1.50 2,107 9.23 1.3206
2014-11-04 2014-09-30 13F Comcast COM 20030N200 36,073 -200 -0.55 1,929 -0.26 1.2971
2014-08-12 2014-06-30 13F Comcast COM 20030N200 36,273 -1,020 -2.74 1,934 6.38 1.3368
2014-05-13 2014-03-31 13F Comcast COM 20030N200 37,293 900 2.47 1,818 0.17 1.3365
2014-02-07 2013-12-31 13F Comcast COM 20030N200 36,393 93 0.26 1,815 15.38 1.3953
2013-11-08 2013-09-30 13F Comcast COM 20030N200 36,300 245 0.68 1,573 10.00 1.3286
2013-08-13 2013-06-30 13F/A-1 Comcast COM 20030N200 36,055 36,055 1,430 1.2713
2013-08-12 2013-06-30 13F Comcast COM 20030N200 36,055 1,430 1.2939
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.