William Blair Investment Management
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William Blair Investment Management’s Malibu Boats MBUU Stock Holding History

William Blair Investment Management’s Portfolio MBUU Stock Details MBUU Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$10.3M Sell
375,988
-99,808
-21% -$2.65M 0.03% 310
2026
Q1 		$12.3M Buy
+475,796
New +$14.2M 0.04% 297

Other funds holding MBUU

Pzena Investment Management
Pzena Investment Management New York $34.1B AUM 23.81% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
CB
Cooke & Bieler Philadelphia, Pennsylvania $8.65B AUM 9.66% 1-Year Est. Return
LHC
Lodge Hill Capital New York $596M AUM 24.4% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
FWIA
Fort Washington Investment Advisors Cincinnati, Ohio $19.9B AUM 22.19% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

William Blair Investment Management's MBUU Position: Q2 2026 in Review

William Blair Investment Management reduced its Malibu Boats (MBUU) stake by 21% in Q2 2026, selling an estimated $2.65M and leaving 375,988 shares worth $10.3M. The position accounts for 0.03% of the portfolio, ranked #310.

William Blair Investment Management first reported a position in MBUU in Q1 2026 and has held it in 2 quarters since. The position peaked at $12.3M in Q1 2026. 141 funds tracked by Wall St. Rank hold MBUU as of Q2 2026.

  • William Blair Investment Management held 375,988 shares of Malibu Boats worth $10.3M as of Q2 2026.
  • William Blair Investment Management sold 99,808 Malibu Boats shares in Q2 2026, an estimated $2.65M.
  • Malibu Boats made up 0.03% of William Blair Investment Management's portfolio in Q2 2026, its #310 holding.
  • William Blair Investment Management first reported a position in Malibu Boats in Q1 2026 and has held it in 2 quarters since.
  • William Blair Investment Management's Malibu Boats position peaked at $12.3M in Q1 2026.
  • 141 funds tracked by Wall St. Rank held Malibu Boats as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.