Portolan Capital Management, LLC
Position in UCTT — Ultra Clean Holdings, Inc.
CIK 1350290
BOSTON, MA
Position in UCTT
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$2,095,466
-$2,498,166 QoQ
Shares Held
33,700
-66.3% QoQ
Ownership
0.075%
of shares outstanding
% of Portfolio
0.11%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2024
2 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in UCTT Over Time
Shares Held
Position Value (USD)
Position in Semiconductor Equipment & Materials
Technology · as of Mar 31, 2026Portolan Capital Management, LLC holds $31,297,669 across 6 Semiconductor Equipment & Materials names. UCTT ranks #6 (6.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | VECO |
Veeco Instruments Inc
|
253,379 | $8,579,412 | |
| 2 | ACLS |
Axcelis Technologies Inc
|
77,168 | $7,182,797 | |
| 3 | AMBA |
Ambarella Inc
|
108,749 | $5,598,398 | |
| 4 | ONTO |
Onto Innovation Inc.
|
22,263 | $4,565,473 | |
| 5 | ACMR |
ACM Research, Inc.
|
83,256 | $3,276,123 | |
| 6 | UCTT |
Ultra Clean Holdings, Inc.
This page
|
33,700 | $2,095,466 |
All Filings in UCTT
Export CSV
2 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $2,095,466 | 33,700 | Shares | Sole | 2026-05-15 | |
| 2024-03-31 | $4,593,632 | 99,992 | Shares | Sole | 2024-05-15 | |
| No filing history on record for this holder in this stock. | ||||||