Position in ONTO
as of Jun 30, 2026
· filed Jul 13, 2026
Position Value
$11,921,175
+$5,054,265 QoQ
Shares Held
31,500
-27.6% QoQ
Ownership
0.064%
of shares outstanding
% of Portfolio
1.33%
of 13F equity value
Holder Rank
#161
of 686 holders
Holding Since
Jun 2024
6 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in ONTO Over Time
Shares Held
Position Value (USD)
Derivatives in ONTO
reported options exposure · as of Dec 31, 2025CallValue
$2,367,900
CallShares
15,000
PutValue
$0
PutShares
0
Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.
Position in Semiconductor Equipment & Materials
Technology · as of Jun 30, 2026ARDSLEY ADVISORY PARTNERS LP holds $29,401,922 across 6 Semiconductor Equipment & Materials names. ONTO ranks #1 (40.5% of the industry book) .
All Filings in ONTO
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8 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $11,921,175 | 31,500 | Shares | Sole | 2026-07-13 | |
| 2025-12-31 | $6,866,910 | 43,500 | Shares | Sole | 2026-02-17 | |
| 2025-12-31 | $2,367,900 | 15,000 | Call | Sole | 2026-02-17 | |
| 2025-09-30 | $5,233,410 | 40,500 | Shares | Sole | 2025-11-14 | |
| 2024-12-31 | $833,350 | 5,000 | Call | Sole | 2025-02-14 | |
| 2024-12-31 | $3,566,738 | 21,400 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $4,130,444 | 19,900 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $2,964,060 | 13,500 | Shares | Sole | 2024-08-14 | |
| No filing history on record for this holder in this stock. | ||||||