Alta Park Capital, LP: WESTERN DIGITAL CORP (WDC): Quarterly 13F Position History
As of Q1 2026, Alta Park Capital, LP reported 126,583 shares of WESTERN DIGITAL CORP (WDC), worth $34.2M and representing 5.5% of its 13F equity book. Quarter-over-quarter share count change: 266,896 (-67.8%) . The position first appeared in Q2 2025 and has been disclosed across 4 13F-HR filings in Pactolio's tracked window.
- 126,583Shares Held (Latest Filing)
- $34.2MReported Market Value (Latest Filing)
- 5.5%Portfolio Weight (% of 13F Equity Book)
- 266,896Quarter-over-Quarter Share Change
- -$33.5MQuarter-over-Quarter Value Change
- 663,749Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 4 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 126,583 | 266,896 | -67.8% | $34.2M | 5.5% | $270.5 |
| Q4 2025 | 393,479 | 77,421 | -16.4% | $67.8M | 8.2% | $172.3 |
| Q3 2025 | 470,900 | 192,849 | -29.1% | $56.5M | 5.7% | $120.1 |
| Q2 2025 | 663,749 | — | — | $42.5M | 5.2% | $64.0 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Alta Park Capital, LP first disclose a WDC position in 13F-HR filings?
Alta Park Capital, LP first reported WESTERN DIGITAL CORP (WDC) on its 13F-HR filing for the period ending 2025-06-30 (Q2 2025). The position has appeared on 4 reported quarters within Pactolio's tracked window.
What was Alta Park Capital, LP's most recent quarter-over-quarter share-count change in WDC?
Between Q4 2025 and Q1 2026, Alta Park Capital, LP reduced its WDC position by 266,896 shares (-67.8%), leaving 126,583 shares at a market value of $34.2M.
Does the implied price-per-share represent Alta Park Capital, LP's cost basis in WDC?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.