Essex Investment Management’s Amprius Technologies AMPX Stock Holding History

Essex 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	$7.51M	Sell	445,441 -71,324	-14%	-$930K	1.19%	19
2025 Q4	$4.08M	Sell	516,765 -180,622	-26%	-$2.06M	0.62%	57
2025 Q3	$7.34M	Sell	697,387 -327,970	-32%	-$2.58M	1.12%	21
2025 Q2	$4.32M	Buy	1,025,357 +89,542	+10%	+$252K	0.78%	37
2025 Q1	$2.51M	Buy	+935,815	New	+$2.76M	0.52%	78

Other funds holding AMPX

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

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 New York $124B AUM 33.93% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

Essex Investment Management's AMPX Position: Q1 2026 in Review

Essex Investment Management reduced its Amprius Technologies (AMPX) stake by 14% in Q1 2026, selling an estimated $930K and leaving 445,441 shares worth $7.51M. The position accounts for 1.19% of the portfolio, ranked #19.

Essex Investment Management first reported a position in AMPX in Q1 2025 and has held it in 5 quarters since. 245 funds tracked by Wall St. Rank hold AMPX as of Q1 2026.

Essex Investment Management held 445,441 shares of Amprius Technologies worth $7.51M as of Q1 2026.
Essex Investment Management sold 71,324 Amprius Technologies shares in Q1 2026, an estimated $930K.
Amprius Technologies made up 1.19% of Essex Investment Management's portfolio in Q1 2026, its #19 holding.
Essex Investment Management first reported a position in Amprius Technologies in Q1 2025 and has held it in 5 quarters since.
245 funds tracked by Wall St. Rank held Amprius Technologies as of Q1 2026.

Based on Essex Investment Management's 13F filing for Q1 2026, filed 11 May 2026.