William Blair Investment Management
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William Blair Investment Management’s Ambarella AMBA Stock Holding History

William Blair Investment Management’s Portfolio AMBA Stock Details AMBA Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q2 		– Sell
-6,351
Closed -$320K – 418
2025
Q1 		$320K Sell
6,351
-822,701
-99% -$56.3M ﹤0.01% 403
2024
Q4 		$60.3M Buy
829,052
+68,044
+9% +$4.34M 0.15% 136
2024
Q3 		$42.9M Buy
761,008
+28,881
+4% +$1.54M 0.11% 154
2024
Q2 		$39.5M Sell
732,127
-870,352
-54% -$43.2M 0.1% 166
2024
Q1 		$81.4M Sell
1,602,479
-35,316
-2% -$1.93M 0.21% 129
2023
Q4 		$100M Sell
1,637,795
-30,135
-2% -$1.64M 0.29% 105
2023
Q3 		$88.5M Sell
1,667,930
-10,210
-0.6% -$717K 0.29% 104
2023
Q2 		$140M Buy
1,678,140
+264,377
+19% +$19.3M 0.45% 76
2023
Q1 		$109M Buy
1,413,763
+25,957
+2% +$2.22M 0.38% 91
2022
Q4 		$114M Buy
+1,387,806
New +$92.4M 0.44% 80

Other funds holding AMBA

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Manulife (Manufacturers Life Insurance)
Manulife (Manufacturers Life Insurance) Canada, Ontario, Canada $116B AUM 26.37% 1-Year Est. Return
JCAM
Jericho Capital Asset Management New York $6.76B AUM 88.1% 1-Year Est. Return
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management San Mateo, California $29.7B AUM 43.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Legal & General Group
Legal & General Group London, United Kingdom $432B AUM 29.4% 1-Year Est. Return

William Blair Investment Management's AMBA Position: Q2 2025 in Review

William Blair Investment Management sold out of Ambarella (AMBA) in Q2 2025, closing a stake of 6,351 shares — an estimated $320K sold.

William Blair Investment Management first reported a position in AMBA in Q4 2022 and held it in 10 quarters. The position peaked at $140M in Q2 2023. 304 funds tracked by Wall St. Rank hold AMBA as of Q2 2025.

  • William Blair Investment Management reported no remaining Ambarella position as of Q2 2025 after selling out during the quarter.
  • William Blair Investment Management sold 6,351 Ambarella shares in Q2 2025, an estimated $320K.
  • William Blair Investment Management first reported a position in Ambarella in Q4 2022 and held it in 10 quarters.
  • William Blair Investment Management's Ambarella position peaked at $140M in Q2 2023.
  • 304 funds tracked by Wall St. Rank held Ambarella as of Q2 2025.

Based on William Blair Investment Management's 13F filing for Q2 2025, filed 29 Jul 2025.