Parallax Volatility Advisers, L.P.
Position in WDC — Western Digital Corp
CIK 1521001
San Francisco, CA
Position in WDC
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$18,518,286
+$1,770,714 QoQ
Shares Held
68,462
-29.6% QoQ
Ownership
0.020%
of shares outstanding
% of Portfolio
1.29%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
25 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in WDC Over Time
Shares Held
Position Value (USD)
Derivatives in WDC
reported options exposure · as of Mar 31, 2026CallValue
$39,599,736
CallShares
146,400
PutValue
$27,049
PutShares
100
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 Mar 31, 2026Parallax Volatility Advisers, L.P. holds $37,571,911 across 5 Computer Hardware names. WDC ranks #1 (49.3% of the industry book) .
All Filings in WDC
Export CSV
50 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 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 | $12,985,185 | 288,100 | Call | Sole | 2025-02-14 | |
| 2024-12-31 | $2,697,547 | 59,850 | Shares | Sole | 2025-02-14 | |
| 2024-12-31 | $22,535 | 500 | Put | Sole | 2025-02-14 | |
| 2024-09-30 | $3,331,961 | 64,551 | Shares | Sole | 2024-11-14 | |
| 2024-09-30 | $1,765,318 | 34,200 | Put | Sole | 2024-11-14 | |
| 2024-09-30 | $15,129,089 | 293,100 | Call | Sole | 2024-11-14 | |
| 2024-06-30 | $14,014,311 | 244,700 | Call | Sole | 2024-08-14 | |
| 2024-06-30 | $5,942,308 | 103,757 | Shares | Sole | 2024-08-14 | |
| 2024-06-30 | $4,329,717 | 75,600 | Put | Sole | 2024-08-14 | |
| 2024-03-31 | $4,480,573 | 86,867 | Shares | Sole | 2024-05-15 | |
| 2024-03-31 | $3,352,680 | 65,000 | Put | Sole | 2024-05-15 | |
| 2023-12-31 | $4,203,852 | 106,200 | Call | Sole | 2024-02-14 | |
| 2023-12-31 | $3,079,658 | 77,800 | Put | Sole | 2024-02-14 | |
| 2023-09-30 | $2,779,877 | 80,600 | Call | Sole | 2023-11-14 | |
| 2023-09-30 | $3,279,979 | 95,100 | Put | Sole | 2023-11-14 | |
| 2023-06-30 | $1,396,214 | 48,700 | Call | Sole | 2023-08-14 | |
| 2023-06-30 | $1,906,535 | 66,500 | Put | Sole | 2023-08-14 | |
| 2023-03-31 | $13,052,114 | 458,400 | Call | Sole | 2023-05-15 | |
| 2023-03-31 | $9,168,370 | 322,000 | Put | Sole | 2023-05-15 | |
| 2023-03-31 | $3,051,558 | 107,173 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $15,708,216 | 658,700 | Call | Sole | 2023-02-27 | |
| 2022-12-31 | $6,319,534 | 265,000 | Put | Sole | 2023-02-27 | |
| 2022-09-30 | $12,555,012 | 510,300 | Call | Sole | 2022-11-21 | |
| 2022-09-30 | $11,049,297 | 449,100 | Put | Sole | 2022-11-21 | |
| 2022-06-30 | $12,503,601 | 369,000 | Put | Sole | 2022-08-17 | |
| 2022-06-30 | $12,313,845 | 363,400 | Call | Sole | 2022-08-17 | |
| 2022-06-30 | $4,737,611 | 139,814 | Shares | Sole | 2022-08-17 | |
| 2022-03-31 | $17,025,313 | 453,666 | Shares | Sole | 2022-05-16 | |
| 2022-03-31 | $32,694,654 | 871,200 | Put | Sole | 2022-05-16 | |
| 2022-03-31 | $6,383,563 | 170,100 | Call | Sole | 2022-05-16 | |
| 2021-12-31 | $58,220,747 | 1,181,200 | Put | Sole | 2022-02-14 | |
| 2021-12-31 | $8,794,626 | 178,428 | Shares | Sole | 2022-02-14 | |
| 2021-12-31 | $4,652,927 | 94,400 | Call | Sole | 2022-02-14 | |
| 2021-09-30 | $4,304,452 | 100,900 | Call | Sole | 2021-11-15 | |
| 2021-09-30 | $59,170,234 | 1,387,000 | Put | Sole | 2021-11-15 | |
| No filing history on record for this holder in this stock. | ||||||