William Blair Investment Management
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William Blair Investment Management’s Amprius Technologies AMPX Stock Holding History

William Blair Investment Management’s Portfolio AMPX Stock Details AMPX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$19.7M Buy
1,170,131
+185,225
+19% +$2.41M 0.07% 258
2025
Q4 		$7.77M Buy
+984,906
New +$11.3M 0.02% 327

Other funds holding AMPX

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Jane Street
Jane Street New York $777B AUM 61.18% 1-Year Est. Return
DCM
Driehaus Capital Management Chicago, Illinois $13.6B AUM 173.98% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $124B AUM 33.93% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

William Blair Investment Management's AMPX Position: Q1 2026 in Review

William Blair Investment Management increased its Amprius Technologies (AMPX) stake by 19% in Q1 2026, buying an estimated $2.41M and bringing the position to 1,170,131 shares worth $19.7M. The position accounts for 0.07% of the portfolio, ranked #258.

William Blair Investment Management first reported a position in AMPX in Q4 2025 and has held it in 2 quarters since. 245 funds tracked by Wall St. Rank hold AMPX as of Q1 2026.

  • William Blair Investment Management held 1,170,131 shares of Amprius Technologies worth $19.7M as of Q1 2026.
  • William Blair Investment Management bought 185,225 Amprius Technologies shares in Q1 2026, an estimated $2.41M.
  • Amprius Technologies made up 0.07% of William Blair Investment Management's portfolio in Q1 2026, its #258 holding.
  • William Blair Investment Management first reported a position in Amprius Technologies in Q4 2025 and has held it in 2 quarters since.
  • 245 funds tracked by Wall St. Rank held Amprius Technologies as of Q1 2026.

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