William Blair & Company
BRK.B icon

William Blair & Company’s Berkshire Hathaway Class B BRK.B Stock Holding History

William Blair & Company’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
2017
Q3 		– Sell
-700
Closed -$119K – 1378
2017
Q2 		$119K Hold
700
– – ﹤0.01% 1412
2017
Q1 		$117K Hold
700
– – ﹤0.01% 1280
2016
Q4 		$114K Buy
+700
New +$108K ﹤0.01% 1208

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

William Blair & Company's BRK.B Position: Q1 2026 in Review

William Blair & Company increased its Berkshire Hathaway Class B (BRK.B) stake by 11% in Q1 2026, buying an estimated $23.7M and bringing the position to 495,322 shares worth $237M. The position accounts for 0.68% of the portfolio, ranked #32.

William Blair & Company first reported a position in BRK.B in Q2 2013 and has held it in 52 quarters since. 4,856 funds tracked by Wall St. Rank hold BRK.B as of Q1 2026.

  • William Blair & Company held 495,322 shares of Berkshire Hathaway Class B worth $237M as of Q1 2026.
  • William Blair & Company bought 48,260 Berkshire Hathaway Class B shares in Q1 2026, an estimated $23.7M.
  • Berkshire Hathaway Class B made up 0.68% of William Blair & Company's portfolio in Q1 2026, its #32 holding.
  • William Blair & Company first reported a position in Berkshire Hathaway Class B in Q2 2013 and has held it in 52 quarters since.
  • 4,856 funds tracked by Wall St. Rank held Berkshire Hathaway Class B as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.