Christopher Bloomstran's Semper Augustus Investments Group holds 273K shares of Berkshire Hathaway Inc (BRK-B) worth about $136.7M as of June 30, 2026, according to the 13F-HR filed with the SEC on August 14, 2026. The position is 15.45% of the reported portfolio, the largest of 50 stock positions. Christopher Bloomstran added 8% to the share count in 2026 Q2.
What did the 2026 Q2 filing report for BRK-B?
As of June 30, 2026, from the 13F-HR filed August 14, 2026.
| Value | |
|---|---|
| Portfolio weight | 15.45% |
| Shares | 273K |
| Reported value | $136.7M |
| Rank in portfolio | 1st of 50 |
| Next largest holding | ALK at 10.58% |
| Top three holdings | 36.19% of the book |
| Change this quarter | +8% shares |
How concentrated is Christopher Bloomstran in BRK-B?
BRK-B at 15.45% is 7.7 times the average stock position in the Christopher Bloomstran portfolio, which is 2%. The next largest holding is ALK at 10.58%. The three largest stocks together are 36.19% of the reported book. A quarter earlier BRK-B was 14.48% of the book.
Where does BRK-B sit in the Christopher Bloomstran portfolio?
BRK-B is the largest of 50 stock positions in the Christopher Bloomstran portfolio at 15.45%, above the fund's average stock position of 2%. The BRK-B addition was the 8th largest of the quarter's 33 position changes by percent change to portfolio. Across the 2026 Q2 portfolio, Christopher Bloomstran reported 50 stock positions, with 7 opened and 1 closed. The total portfolio value is about $884.6M, up 6% from the prior quarter.
How long has Christopher Bloomstran held BRK-B?
Christopher Bloomstran has held BRK-B since at least the quarter ended June 30, 2013, the start of the filings we track. The weight peaked at 26.53% in 2017 Q4. Last quarter the fund added to the position by 2%. Every reported trade is on the Christopher Bloomstran BRK-B trade history page.
Did other funds buy or sell BRK-B in 2026 Q2?
Among the other tracked funds that had filed for 2026 Q2 as of August 14, 2026, 18 hold BRK-B. One other tracked fund sold out of it. The largest buyers of BRK-B this quarter were Duan Yongping, Donald Yacktman and Li Lu. The largest sellers were Bill Gates, Thomas Russo and Francois Rochon. Every tracked holder of BRK-B is on the BRK-B ownership page.
FAQ
What share of the Christopher Bloomstran portfolio is BRK-B?
BRK-B is 15.45% of the Christopher Bloomstran portfolio as of 2026 Q2, the largest of 50 stock positions.
What is the BRK-B stake of Christopher Bloomstran worth?
Christopher Bloomstran holds 273K shares of BRK-B, worth about $136.7M at June 30, 2026 prices, 15.45% of the reported portfolio.
What are the largest holdings of Christopher Bloomstran?
The largest stock positions of Christopher Bloomstran as of 2026 Q2 are BRK-B (15.45%), ALK (10.58%) and BRK-A (10.16%), together 36.19% of the book.
Did Christopher Bloomstran's Semper Augustus Investments Group change its BRK-B position in 2026 Q2?
Christopher Bloomstran added 8% to the share count in 2026 Q2.