Parallax Volatility Advisers, L.P.
Position in WDC — Western Digital Corp
CIK 1521001
San Francisco, CA
Position in WDC
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$3,033,281
-$15,485,005 QoQ
Shares Held
4,749
-93.1% QoQ
Ownership
0.001%
of shares outstanding
% of Portfolio
0.15%
of 13F equity value
Holder Rank
#716
of 1,846 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in WDC Over Time
Shares Held
Position Value (USD)
Derivatives in WDC
reported options exposure · as of Jun 30, 2026CallValue
$63,872,000
CallShares
100,000
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 Computer Hardware
Technology · as of Jun 30, 2026Parallax Volatility Advisers, L.P. holds $57,799,254 across 9 Computer Hardware names. WDC ranks #4 (5.2% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | DELL |
Dell Technologies Inc.
|
51,200 | $22,090,752 | |
| 2 | SNDK |
Sandisk Corp
|
6,649 | $15,118,030 | |
| 3 | SMCI |
Super Micro Computer, Inc.
|
403,449 | $11,833,159 | |
| 4 | WDC |
Western Digital Corp
This page
|
4,749 | $3,033,281 | |
| 5 | IONQ |
IonQ, Inc.
|
51,179 | $2,725,793 | |
| 6 | HPQ |
Hp Inc
|
47,165 | $1,034,800 | |
| 7 | RGTI |
Rigetti Computing, Inc.
|
44,165 | $853,267 | |
| 8 | P |
Everpure, Inc.
|
10,122 | $797,512 |
All Filings in WDC
Export CSV
50 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $63,872,000 | 100,000 | Call | Sole | 2026-08-14 | |
| 2026-06-30 | $3,033,281 | 4,749 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $39,599,736 | 146,400 | Call | Sole | 2026-05-15 | |
| 2026-03-31 | $18,518,286 | 68,462 | Shares | Sole | 2026-05-15 | |
| 2026-03-31 | $27,049 | 100 | Put | Sole | 2026-05-15 | |
| 2025-12-31 | $39,914,959 | 231,700 | Call | Sole | 2026-02-17 | |
| 2025-12-31 | $16,747,572 | 97,217 | Shares | Sole | 2026-02-17 | |
| 2025-12-31 | $6,408,444 | 37,200 | Put | Sole | 2026-02-17 | |
| 2025-09-30 | $4,445,941 | 37,031 | Shares | Sole | 2025-11-14 | |
| 2025-09-30 | $18,333,162 | 152,700 | Put | Sole | 2025-11-14 | |
| 2025-09-30 | $38,707,344 | 322,400 | Call | Sole | 2025-11-14 | |
| 2025-06-30 | $5,439,277 | 85,002 | Shares | Sole | 2025-08-14 | |
| 2025-06-30 | $12,266,883 | 191,700 | Call | Sole | 2025-08-14 | |
| 2025-06-30 | $10,852,704 | 169,600 | Put | Sole | 2025-08-14 | |
| 2025-03-31 | $4,871,815 | 120,500 | Put | Sole | 2025-05-15 | |
| 2025-03-31 | $3,710,665 | 91,780 | Shares | Sole | 2025-05-15 | |
| 2025-03-31 | $11,498,292 | 284,400 | Call | Sole | 2025-05-15 | |
| 2024-12-31 | $17,179,400 | 288,100 | Call | Sole | 2025-02-14 | |
| 2024-12-31 | $3,568,854 | 59,850 | Shares | Sole | 2025-02-14 | |
| 2024-12-31 | $29,814 | 500 | Put | Sole | 2025-02-14 | |
| 2024-09-30 | $4,408,184 | 64,551 | Shares | Sole | 2024-11-14 | |
| 2024-09-30 | $2,335,516 | 34,200 | Put | Sole | 2024-11-14 | |
| 2024-09-30 | $20,015,785 | 293,100 | Call | Sole | 2024-11-14 | |
| 2024-06-30 | $18,540,934 | 244,700 | Call | Sole | 2024-08-14 | |
| 2024-06-30 | $7,861,674 | 103,757 | Shares | Sole | 2024-08-14 | |
| 2024-06-30 | $5,728,216 | 75,600 | Put | Sole | 2024-08-14 | |
| 2024-03-31 | $5,927,799 | 86,867 | Shares | Sole | 2024-05-15 | |
| 2024-03-31 | $4,435,596 | 65,000 | Put | Sole | 2024-05-15 | |
| 2023-12-31 | $5,561,697 | 106,200 | Call | Sole | 2024-02-14 | |
| 2023-12-31 | $4,074,388 | 77,800 | Put | Sole | 2024-02-14 | |
| 2023-09-30 | $3,677,778 | 80,600 | Call | Sole | 2023-11-14 | |
| 2023-09-30 | $4,339,413 | 95,100 | Put | Sole | 2023-11-14 | |
| 2023-06-30 | $1,847,191 | 48,700 | Call | Sole | 2023-08-14 | |
| 2023-06-30 | $2,522,345 | 66,500 | Put | Sole | 2023-08-14 | |
| 2023-03-31 | $17,267,947 | 458,400 | Call | Sole | 2023-05-15 | |
| 2023-03-31 | $12,129,754 | 322,000 | Put | Sole | 2023-05-15 | |
| 2023-03-31 | $4,037,211 | 107,173 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $8,360,744 | 265,000 | Put | Sole | 2023-02-27 | |
| 2022-12-31 | $20,781,970 | 658,700 | Call | Sole | 2023-02-27 | |
| 2022-09-30 | $16,610,282 | 510,300 | Call | Sole | 2022-11-21 | |
| 2022-09-30 | $14,618,220 | 449,100 | Put | Sole | 2022-11-21 | |
| 2022-06-30 | $16,291,217 | 363,400 | Call | Sole | 2022-08-17 | |
| 2022-06-30 | $16,542,265 | 369,000 | Put | Sole | 2022-08-17 | |
| 2022-06-30 | $6,267,859 | 139,814 | Shares | Sole | 2022-08-17 | |
| 2022-03-31 | $22,524,490 | 453,666 | Shares | Sole | 2022-05-16 | |
| 2022-03-31 | $43,255,028 | 871,200 | Put | Sole | 2022-05-16 | |
| 2022-03-31 | $8,445,454 | 170,100 | Call | Sole | 2022-05-16 | |
| 2021-12-31 | $77,026,055 | 1,181,200 | Put | Sole | 2022-02-14 | |
| 2021-12-31 | $11,635,291 | 178,428 | Shares | Sole | 2022-02-14 | |
| 2021-12-31 | $6,155,824 | 94,400 | Call | Sole | 2022-02-14 | |
| No filing history on record for this holder in this stock. | ||||||