Mariner
BRK.B icon

Mariner’s Berkshire Hathaway Class B BRK.B Stock Holding History

Mariner’s Portfolio BRK.B Stock Details BRK.B Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2018
Q2 		– Sell
-600
Closed -$1K – 795
2018
Q1 		$1K Buy
+600
New +$123K ﹤0.01% 655

Other funds holding BRK.B

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Gates Foundation Trust
Gates Foundation Trust Kirkland, Washington $31.7B AUM 20.52% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
Northern Trust
Northern Trust Chicago, Illinois $757B AUM 28.64% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Mariner's BRK.B Position: Q1 2026 in Review

Mariner increased its Berkshire Hathaway Class B (BRK.B) stake by 3.3% in Q1 2026, buying an estimated $19.6M and bringing the position to 1,256,077 shares worth $602M. The position accounts for 0.7% of the portfolio, ranked #26.

Mariner first reported a position in BRK.B in Q2 2013 and has held it in 52 quarters since. The position peaked at $611M in Q4 2025. 4,853 funds tracked by Wall St. Rank hold BRK.B as of Q1 2026.

  • Mariner held 1,256,077 shares of Berkshire Hathaway Class B worth $602M as of Q1 2026.
  • Mariner bought 39,927 Berkshire Hathaway Class B shares in Q1 2026, an estimated $19.6M.
  • Berkshire Hathaway Class B made up 0.7% of Mariner's portfolio in Q1 2026, its #26 holding.
  • Mariner first reported a position in Berkshire Hathaway Class B in Q2 2013 and has held it in 52 quarters since.
  • Mariner's Berkshire Hathaway Class B position peaked at $611M in Q4 2025.
  • 4,853 funds tracked by Wall St. Rank held Berkshire Hathaway Class B as of Q1 2026.

Based on Mariner's 13F filing for Q1 2026, filed 13 May 2026.