Institutional Manager · CIK 0001912699
Graham Holdings Co Master Retirement Trust
Arlington, VA · File #028-22321
Latest AUM
$750,426
Positions
2
Top-10 Concentration
100.0%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| REDUCE | BERKSHIRE HATHAWAY INC DEL | BRK-A | 0 | $0 | +$497 |
| REDUCE | MARKEL GROUP INC | MKL | 0 | $0 | +$13,823 |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 20252 pos · $750,426
- 13F HOLDINGS REPORTQ/E Sep 20252 pos · $736,106
- 13F HOLDINGS REPORTQ/E Jun 20252 pos · $720,038
- 13F HOLDINGS REPORTQ/E Mar 20252 pos · $770,360
- 13F HOLDINGS REPORTQ/E Dec 20242 pos · $664,618
- 13F HOLDINGS REPORTQ/E Sep 20242 pos · $663,978
- 13F HOLDINGS REPORTQ/E Jun 20242 pos · $598,949
- 13F HOLDINGS REPORTQ/E Mar 20242 pos · $614,209
- 13F HOLDINGS REPORTQ/E Dec 20232 pos · $526,010
Top 2 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | BERKSHIRE HATHAWAY INC DEL | BRK-A | 829 | $625,729 | 83.38% |
| 2 | MARKEL GROUP INC | MKL | 58,008 | $124,697 | 16.62% |