ESSEX INVESTMENT MANAGEMENT CO LLC
Position in AMPX — Amprius Technologies, Inc.
CIK 201772
BOSTON, MA
Position in AMPX
as of Jun 30, 2026
· filed Aug 6, 2026
Position Value
$3,944,486
-$3,565,649 QoQ
Shares Held
284,595
-36.1% QoQ
Ownership
0.195%
of shares outstanding
% of Portfolio
0.53%
of 13F equity value
Holder Rank
#60
of 259 holders
Holding Since
Mar 2025
6 quarters on record
Voting authority
Sole 62%
Shared 0%
None 38%
Common Shares in AMPX Over Time
Shares Held
Position Value (USD)
Position in Electrical Equipment & Parts
Industrials · as of Jun 30, 2026ESSEX INVESTMENT MANAGEMENT CO LLC holds $5,825,111 across 8 Electrical Equipment & Parts names. AMPX ranks #1 (67.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | AMPX |
Amprius Technologies, Inc.
This page
|
284,595 | $3,944,486 | |
| 2 | ELVA |
Electrovaya Inc.
|
71,791 | $753,805 | |
| 3 | RFIL |
R F Industries Ltd
|
17,864 | $378,895 | |
| 4 | EOSE |
Eos Energy Enterprises, Inc.
|
60,425 | $355,299 | |
| 5 | OESX |
Orion Energy Systems, Inc.
|
20,608 | $240,907 | |
| 6 | NVT |
nVent Electric plc
|
508 | $86,161 | |
| 7 | AYI |
Acuity Inc. (De)
|
131 | $49,342 | |
| 8 | CYATY |
Contemporary Amperex Technology Co., Limited/ADR
|
722 | $16,216 |
All Filings in AMPX
Export CSV
6 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $3,944,486 | 284,595 | Shares | Sole | 2026-08-06 | |
| 2026-03-31 | $7,510,135 | 445,441 | Shares | Sole | 2026-05-11 | |
| 2025-12-31 | $4,077,275 | 516,765 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $7,336,511 | 697,387 | Shares | Sole | 2025-11-06 | |
| 2025-06-30 | $4,316,752 | 1,025,357 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $2,507,984 | 935,815 | Shares | Sole | 2025-05-07 | |
| No filing history on record for this holder in this stock. | ||||||