Alta Park Capital, LP WDC — Western Digital Corp

Ownership history in Alta Park Capital, LP  ·  4 quarters on record

AI Ownership Summary

Alta Park Capital, LP reported Western Digital Corp (WDC) in 4 quarterly 13F filings from 2025 Q2 through 2026 Q1. Peak portfolio weight reached 8.16% in 2025 Q4. The latest visible filing shows WDC at 5.34% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this WDC ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Alta Park Capital, LP's position in Western Digital Corp, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2026 Q1

WDC was reported at 5.34% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
8.16% in 2025 Q4

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2025 Q2 to 2026 Q1

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

WDC stock page Alta Park Capital, LP fund profile Alta Park Capital, LP full holdings
How Alta Park Capital, LP held WDC — position size vs. price
% of Fund (quarterly)    WDC price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 4 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 REDUCED — — — 126,583 -266,896 -67.8% 5.34% $34.2M 2026-05-15 $482.02
2025 Q4 REDUCED 16.4% +57.1% ❌ 393,479 -77,421 -16.4% 8.16% $67.8M 2026-02-17 $283.97
2025 Q3 REDUCED 29.1% +49.8% ❌ 470,900 -192,849 -29.1% 4.94% $56.5M 2025-11-14 $157.63
2025 Q2 INITIATED — — — 663,749 — — 4.82% $42.5M 2025-08-14 $76.05

🏢 Other funds also holding WDC

As of 2026 Q1 — sorted by position size

Central Asset Investments & Management Holdings (HK) Ltd 3Y 7Y 18.5% Maple Rock Capital Partners Inc. 3Y 7Y 12.32% PINNBROOK CAPITAL MANAGEMENT LP 3Y 10.54% 53 HOUSE LLP 3Y 7Y 10.0% Amanah Holdings Trust 9.38% Up Capital Management, Inc. 8.61% Talos Eurisko Asset Management LP 8.03% Trivest Advisors Ltd 3Y 6.72% Rivermont Capital Management LP 3Y 6.59% Grand Alliance Asset Management Ltd 5.9%

FAQ About Alta Park Capital, LP and WDC

These are the practical questions this page is built to answer before you even open the full history table.

How long has Alta Park Capital, LP reported owning WDC?

Alta Park Capital, LP reported WDC across 4 quarterly 13F filings, from 2025 Q2 through 2026 Q1.

What was the largest reported WDC position in Alta Park Capital, LP's portfolio?

The largest reported portfolio weight for WDC was 8.16% in 2025 Q4.

What is the latest reported WDC position on this page?

The most recent filing on this page is 2026 Q1, when Alta Park Capital, LP reported 126,583 shares, equal to 5.34% of portfolio, with an estimated market value of $34.2M.

What does the chart on this WDC ownership page compare?

The chart compares Alta Park Capital, LP's quarterly WDC portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did Alta Park Capital, LP time their WDC position?

Based on 13F filing dates vs. subsequent WDC price moves, Alta Park Capital, LP correctly timed 1 out of 3 reported position changes (33%). The annualised alpha on WDC relative to SPY over the holding period was +866.5%.

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