William Blair & Company
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William Blair & Company’s Amprius Technologies AMPX Stock Holding History

William Blair & Company’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
Q2 		$2.7M Buy
194,712
+68,090
+54% +$1.22M 0.01% 681
2026
Q1 		$2.13M Buy
126,622
+86,470
+215% +$1.13M 0.01% 719
2025
Q4 		$317K Buy
40,152
+15,364
+62% +$176K ﹤0.01% 1288
2025
Q3 		$261K Buy
+24,788
New +$195K ﹤0.01% 1355

Other funds holding AMPX

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Jane Street
Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
JAM
Jupiter Asset Management London, United Kingdom $20.2B AUM 29.18% 1-Year Est. Return

William Blair & Company's AMPX Position: Q2 2026 in Review

William Blair & Company increased its Amprius Technologies (AMPX) stake by 54% in Q2 2026, buying an estimated $1.22M and bringing the position to 194,712 shares worth $2.7M. The position accounts for 0.01% of the portfolio, ranked #681.

William Blair & Company first reported a position in AMPX in Q3 2025 and has held it in 4 quarters since. 261 funds tracked by Wall St. Rank hold AMPX as of Q2 2026.

  • William Blair & Company held 194,712 shares of Amprius Technologies worth $2.7M as of Q2 2026.
  • William Blair & Company bought 68,090 Amprius Technologies shares in Q2 2026, an estimated $1.22M.
  • Amprius Technologies made up 0.01% of William Blair & Company's portfolio in Q2 2026, its #681 holding.
  • William Blair & Company first reported a position in Amprius Technologies in Q3 2025 and has held it in 4 quarters since.
  • 261 funds tracked by Wall St. Rank held Amprius Technologies as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.