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# Seagate CEO William Mosley Sells $10.3 Million In STX Shares Under Pre-Scheduled Plan
- URL: https://www.bullished.co/seagate-ceo-william-mosley-sells-10-3-million-in-stx-shares-under-pre-scheduled-plan-81202119/
- Published: 2026-10-02T20:31:05.000Z
- Updated: 2026-10-03T20:40:10.000Z
- Description: The Thursday sale is Mosley's fifth Form 4 disclosure since September 1, bringing his total disposals over that stretch to roughly $121.4 million.
- Author: Matteo Parrino
- Tags: Insider Trades, STX, Industry: Technology

[Seagate Technology](https://www.bullished.co/tag/stx/) CEO William Mosley sold 11,002 STX shares on Thursday under a pre-scheduled trading plan, generating $10.3 million in proceeds, according to a [Form 4 filed](https://www.sec.gov/Archives/edgar/data/0001388390/000113778926000262/xslF345X06/wk-form4%5F1790971675.xml?ref=bullished.co) with the SEC on Friday. The sale is his fifth such disclosure since September 1, and the cumulative total across those five filings now stands at roughly $121.4 million.

## What The Filing Says

Mosley sold his 11,002 shares at a weighted average price of $935.60 each, with individual transactions spread across 16 separate price tranches ranging from $929.01 to $945.97 per share, the [Form 4 shows](https://www.sec.gov/Archives/edgar/data/0001388390/000113778926000262/xslF345X06/wk-form4%5F1790971675.xml?ref=bullished.co).

After the sale, Mosley holds 362,108.25 STX shares — a reduction of about 2.95% of his position. At current prices, that remaining stake is valued at roughly $307.4 million (market data).

All of Thursday's transactions were executed under a pre-scheduled trading plan Mosley adopted on February 18, 2026\. That kind of plan — which lets corporate insiders set sale parameters in advance, removing any discretion at the moment of execution — means Thursday's sales reflect a structured liquidation schedule, not a real-time judgment about the stock.

## Five Filings, $121.4 Million Since September

Thursday's sale is the latest in a run of sizable disposals. Across the five Form 4 filings Mosley has made since September 1, he disposed of about 151,606 shares for roughly $121.4 million in total proceeds, according to SEC records.

The single largest transaction in that stretch came on September 14, when he sold about 97,889 shares at an average of roughly $772.14 per share, generating about $75.6 million. A separate filing captured a sale of 18,998 shares on October 1 at an average price of approximately $914.67 per share, producing roughly $17.4 million.

Because every transaction in this run flows from the same February 2026 plan, the cadence is set by the plan's parameters rather than by any decision Mosley is making week to week.

## Where The Stock Sits Now

STX shares slipped about 0.08% to $848.35 in Friday after-hours trading (market data) — well below the $929–$946 range at which Thursday's sales were executed. That gap matters for the plan's remaining tranches: if shares continue trading near Friday's after-hours level, future sales under the same schedule would capture materially lower prices than Thursday's.

Whether the pre-scheduled plan triggers additional sales in coming weeks — and at what prices relative to the $929–$946 range captured Thursday — is the figure to track as STX shares were trading near $848 in Friday after-hours activity.

### Sources

- [Form 4 — William D Mosley (STX)](https://www.sec.gov/Archives/edgar/data/0001388390/000113778926000262/xslF345X06/wk-form4%5F1790971675.xml?ref=bullished.co) — SEC EDGAR

### More on Seagate Technology

- [Seagate CEO William Mosley Sells $17.4 Million In STX Shares Under Pre-Scheduled Plan](https://www.bullished.co/seagate-ceo-william-mosley-sells-17-4-million-in-stx-shares-under-pre-scheduled-plan-809a9187/)

[All Seagate Technology (STX) coverage →](https://www.bullished.co/tag/stx/)