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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, 2026
CallValue
$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, 2026

Parallax Volatility Advisers, L.P. holds $37,571,911 across 5 Computer Hardware names. WDC ranks #1 (49.3% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 WDC
Western Digital Corp
This page
68,462 $18,518,286

All Filings in WDC

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $39,599,736 146,400
2026-03-31 $18,518,286 68,462
2026-03-31 $27,049 100
2025-12-31 $39,914,959 231,700
2025-12-31 $16,747,572 97,217
2025-12-31 $6,408,444 37,200
2025-09-30 $4,445,941 37,031
2025-09-30 $18,333,162 152,700
2025-09-30 $38,707,344 322,400
2025-06-30 $5,439,277 85,002
2025-06-30 $12,266,883 191,700
2025-06-30 $10,852,704 169,600
2025-03-31 $4,871,815 120,500
2025-03-31 $3,710,665 91,780
2025-03-31 $11,498,292 284,400
2024-12-31 $12,985,185 288,100
2024-12-31 $2,697,547 59,850
2024-12-31 $22,535 500
2024-09-30 $3,331,961 64,551
2024-09-30 $1,765,318 34,200
2024-09-30 $15,129,089 293,100
2024-06-30 $14,014,311 244,700
2024-06-30 $5,942,308 103,757
2024-06-30 $4,329,717 75,600
2024-03-31 $4,480,573 86,867
2024-03-31 $3,352,680 65,000
2023-12-31 $4,203,852 106,200
2023-12-31 $3,079,658 77,800
2023-09-30 $2,779,877 80,600
2023-09-30 $3,279,979 95,100
2023-06-30 $1,396,214 48,700
2023-06-30 $1,906,535 66,500
2023-03-31 $13,052,114 458,400
2023-03-31 $9,168,370 322,000
2023-03-31 $3,051,558 107,173
2022-12-31 $15,708,216 658,700
2022-12-31 $6,319,534 265,000
2022-09-30 $12,555,012 510,300
2022-09-30 $11,049,297 449,100
2022-06-30 $12,503,601 369,000
2022-06-30 $12,313,845 363,400
2022-06-30 $4,737,611 139,814
2022-03-31 $17,025,313 453,666
2022-03-31 $32,694,654 871,200
2022-03-31 $6,383,563 170,100
2021-12-31 $58,220,747 1,181,200
2021-12-31 $8,794,626 178,428
2021-12-31 $4,652,927 94,400
2021-09-30 $4,304,452 100,900
2021-09-30 $59,170,234 1,387,000