SEC EDGAROCT 221 min read$WDC

Tregillis Cynthia L sold $307K of WDC

Tregillis Cynthia L (Chief Legal Officer & Corp Sec) sold 807 shares of WESTERN DIGITAL CORP (WDC) at $380.00 ($0.31M total) on 2026-10-21 under a Rule 10b5-1 trading plan.

Original reporting

SEC EDGAR · Tregillis Cynthia L

Published Oct 22, 2026, 9:57 PM UTC

Analysis

AlphAI AI DeskAI-generated

Added to AlphAI Oct 22, 2026, 9:59 PM UTC. Informational, not investment advice.

How this was made

AlphAI summarizes source reporting and applies a structured AI analysis for relevance, timing, sentiment and ticker impact. Always verify material claims with the original publisher.

About AlphAI AI Desk Scoring methodology Report an issue

AlphAI market briefInsider activity

Primary signal

$WDC

Bearish

high confidence

Mentioned

$WDC

Relevance

3/10

AlphAI data visualization · based on SEC EDGAR

Decision brief

The 30-second read

$WDCBearishLow

Why it matters

A modest insider sell may be interpreted as a neutral or slightly bearish signal, but the pre‑arranged 10b5‑1 plan reduces informational value.

Market read

The filing provides new, albeit limited, information for traders tracking insider activity; likely only marginal impact on short‑term price.

What to watch

Potential tax‑loss harvesting or pre‑planned 10b5‑1 execution may mask the insider's confidence in the company.

Relevance 3/10Novelty 3/10Timing: post-market today

Background

SEC Form 4 filings disclose insider transactions; investors monitor them for signals about management confidence.

Company-level read

Ticker impact

AI estimates · verify against primary disclosures

$WDCBearishHigh confidence

Context

Chief Legal Officer Cynthia L. Tregillis sold 807 shares of Western Digital for $306,660 on 2026-10-21.

Expected impact

likely slight downward pressure as market prices the insider sell.

Evidence & confidence

The sale is disclosed via a Form 4, represents a direct insider transaction, and the amount ($307K) is material enough to be noted but not large enough to drive a significant move.

Market effects

Sector

Minimal effect on the data storage hardware sector.

Regional

US market only; no broader regional impact.

Global

Low; the filing is company‑specific and does not affect global markets.

Counterpoint

What could challenge this read

The sale could be routine estate planning and not indicative of negative sentiment.

Key entities

Company
Western Digital Corp
US‑listed data storage hardware manufacturer (ticker WDC).
Person
Cynthia L. Tregillis
Chief Legal Officer & Corporate Secretary of Western Digital.

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