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Osterweis Capital Management’s Amprius Technologies AMPX Stock Holding History

Osterweis Capital 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 		– Sell
-454,830
Closed -$3.59M – 233
2025
Q4 		$3.59M Buy
454,830
+267,385
+143% +$3.06M 0.15% 90
2025
Q3 		$1.97M Buy
+187,445
New +$1.47M 0.09% 94

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

Osterweis Capital Management's AMPX Position: Q1 2026 in Review

Osterweis Capital Management sold out of Amprius Technologies (AMPX) in Q1 2026, closing a stake of 454,830 shares — an estimated $3.59M sold.

Osterweis Capital Management first reported a position in AMPX in Q3 2025 and held it in 2 quarters. The position peaked at $3.59M in Q4 2025. 245 funds tracked by Wall St. Rank hold AMPX as of Q1 2026.

  • Osterweis Capital Management reported no remaining Amprius Technologies position as of Q1 2026 after selling out during the quarter.
  • Osterweis Capital Management sold 454,830 Amprius Technologies shares in Q1 2026, an estimated $3.59M.
  • Osterweis Capital Management first reported a position in Amprius Technologies in Q3 2025 and held it in 2 quarters.
  • Osterweis Capital Management's Amprius Technologies position peaked at $3.59M in Q4 2025.
  • 245 funds tracked by Wall St. Rank held Amprius Technologies as of Q1 2026.

Based on Osterweis Capital Management's 13F filing for Q1 2026, filed 15 May 2026.