Comcast Corporation
MX ˙ BMV ˙ US20030N1019
SecurityMX:CMCSA / Comcast Corporation
InstitutionRosenberg Matthew Hamilton
Latest Disclosed Ownership3,810 shares
Latest Disclosed Value $ 109,391
Rosenberg Matthew Hamilton reports 47.10% increase in ownership of CMCSA / Comcast Corporation

On April 6, 2026 - Rosenberg Matthew Hamilton filed a 13F-HR form disclosing ownership of 3,810 shares of Comcast Corporation (MX:CMCSA) valued at $109,391 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 5, 2026 disclosing 2,590 shares of Comcast Corporation. This represents a change in shares of 47.10% 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)
2026-04-06 2026-03-31 13F COMCAST CORP NEW CL A Stock 20030N101 3,810 1,220 47.10 109 41.56 0.0224
2026-01-05 2025-12-31 13F COMCAST CORP NEW CL A Stock 20030N101 2,590 -277 -9.66 77 -14.44 0.0160
2025-11-10 2025-09-30 13F COMCAST CORP NEW CL A Stock 20030N101 2,867 -5,603 -66.15 90 -70.20 0.0195
2025-07-28 2025-06-30 13F COMCAST CORP NEW CL A Stock 20030N101 8,470 4,218 99.20 302 93.59 0.0703
2025-04-28 2025-03-31 13F COMCAST CORP NEW CL A Stock 20030N101 4,252 746 21.28 157 19.08 0.0393
2025-01-14 2024-12-31 13F COMCAST CORP NEW CL A Stock 20030N101 3,506 -2,283 -39.44 132 -45.64 0.0342
2024-10-28 2024-09-30 13F COMCAST CORP NEW CL A Stock 20030N101 5,789 65 1.14 242 10.55 0.0633
2024-07-26 2024-06-30 13F COMCAST CORP NEW CL A Stock 20030N101 5,724 -764 -11.78 218 -20.44 0.0645
2024-04-22 2024-03-31 13F COMCAST CORP NEW CL A Stock 20030N101 6,488 -239 -3.55 274 -6.80 0.0793
2024-01-16 2023-12-31 13F COMCAST CORP NEW CL A Stock 20030N101 6,727 294 4.57 295 3.16 0.0907
2023-10-11 2023-09-30 13F COMCAST CORP NEW CL A Stock 20030N101 6,433 118 1.87 285 8.78 0.0950
2023-07-26 2023-06-30 13F COMCAST CORP NEW CL A Stock 20030N101 6,315 -518 -7.58 262 1.16 0.0887
2023-04-17 2023-03-31 13F COMCAST CORP NEW CL A Stock 20030N101 6,833 77 1.14 259 9.75 0.0836
2023-01-19 2022-12-31 13F COMCAST CORP NEW CL A Stock 20030N101 6,756 47 0.70 236 19.80 0.0800
2022-10-21 2022-09-30 13F COMCAST CORP NEW CL A Stock 20030N101 6,709 336 5.27 197 -23.35 0.0762
2022-07-15 2022-06-30 13F COMCAST CORP NEW CL A Stock 20030N101 6,373 -1,699 -21.05 257 -32.01 0.0969
2022-04-14 2022-03-31 13F COMCAST CORP NEW CL A Stock 20030N101 8,072 738 10.06 378 2.44 0.1322
2022-01-20 2021-12-31 13F COMCAST CORP CL A 20030N101 7,334 1,040 16.52 369 4.83 0.1313
2021-10-12 2021-09-30 13F COMCAST CORP CL A 20030N101 6,294 1,386 28.24 352 25.71 0.1390
2021-07-26 2021-06-30 13F COMCAST CORP CL A 20030N101 4,908 -724 -12.86 280 -8.20 0.1457
2021-04-30 2021-03-31 13F COMCAST CORP CL A 20030N101 5,632 -1,214 -17.73 305 -15.04 0.1740
2021-02-03 2020-12-31 13F COMCAST CORP CL A 20030N101 6,846 2,288 50.20 359 70.14 0.2240
2020-10-16 2020-09-30 13F COMCAST CORP CL A 20030N101 4,558 0 0.00 211 18.54 0.1550
2020-08-04 2020-06-30 13F COMCAST NEW CL A 20030N101 4,558 1,658 57.17 178 78.00 0.1418
2020-05-14 2020-03-31 13F COMCAST CORP CL A 20030N101 2,900 2,900 100 0.0995
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.