ESSEX INVESTMENT MANAGEMENT CO LLC
Position in ACLS — Axcelis Technologies Inc
CIK 201772
BOSTON, MA
Position in ACLS
as of Jun 30, 2026
· filed Aug 6, 2026
Position Value
$634,657
+$322,839 QoQ
Shares Held
3,350
0.0% QoQ
Ownership
0.011%
of shares outstanding
% of Portfolio
0.09%
of 13F equity value
Holder Rank
#215
of 441 holders
Holding Since
Jun 2022
17 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in ACLS Over Time
Shares Held
Position Value (USD)
Position in Semiconductor Equipment & Materials
Technology · as of Jun 30, 2026ESSEX INVESTMENT MANAGEMENT CO LLC holds $27,779,629 across 12 Semiconductor Equipment & Materials names. ACLS ranks #6 (2.3% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | COHU |
Cohu Inc
|
131,170 | $9,694,774 | |
| 2 | ASML |
Asml Holding NV
|
3,538 | $7,038,638 | |
| 3 | AMBA |
Ambarella Inc
|
79,997 | $6,863,742 | |
| 4 | ACMR |
ACM Research, Inc.
|
11,770 | $1,493,495 | |
| 5 | ASYS |
Amtech Systems Inc
|
37,761 | $871,523 | |
| 6 | ACLS |
Axcelis Technologies Inc
This page
|
3,350 | $634,657 | |
| 7 | CAMT |
Camtek Ltd
|
2,943 | $480,062 | |
| 8 | TRT |
Trio-Tech International
|
22,115 | $272,456 |
All Filings in ACLS
Export CSV
17 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $634,657 | 3,350 | Shares | Sole | 2026-08-06 | |
| 2026-03-31 | $311,818 | 3,350 | Shares | Sole | 2026-05-11 | |
| 2025-12-31 | $269,139 | 3,350 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $327,094 | 3,350 | Shares | Sole | 2025-11-06 | |
| 2025-06-30 | $259,595 | 3,725 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $185,020 | 3,725 | Shares | Sole | 2025-05-07 | |
| 2024-12-31 | $260,265 | 3,725 | Shares | Sole | 2025-02-07 | |
| 2024-09-30 | $390,566 | 3,725 | Shares | Sole | 2024-10-10 | |
| 2024-06-30 | $529,657 | 3,725 | Shares | Sole | 2024-08-12 | |
| 2024-03-31 | $415,412 | 3,725 | Shares | Sole | 2024-05-03 | |
| 2023-12-31 | $483,095 | 3,725 | Shares | Sole | 2024-02-08 | |
| 2023-09-30 | $607,361 | 3,725 | Shares | Sole | 2023-11-09 | |
| 2023-06-30 | $682,904 | 3,725 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $496,356 | 3,725 | Shares | Sole | 2023-05-04 | |
| 2022-12-31 | $295,616 | 3,725 | Shares | Sole | 2023-02-03 | |
| 2022-09-30 | $225,586 | 3,725 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $204,279 | 3,725 | Shares | Sole | 2022-08-12 | |
| No filing history on record for this holder in this stock. | ||||||