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# Seagate CEO William Mosley Sells $17.4 Million In STX Shares Under Pre-Scheduled Plan
- URL: https://www.bullished.co/seagate-ceo-william-mosley-sells-17-4-million-in-stx-shares-under-pre-scheduled-plan-809a9187/
- Published: 2026-10-02T20:35:57.000Z
- Updated: 2026-10-03T20:40:05.000Z
- Description: The Thursday sale is the latest in a months-long program that has now moved more than $114 million of Seagate stock since September.
- Author: Matteo Parrino
- Tags: Insider Trades, STX, Industry: Technology

[Seagate Technology](https://www.bullished.co/tag/stx/) CEO William Mosley sold nearly 19,000 STX shares on Thursday under a pre-scheduled trading plan, generating $17.4 million in proceeds, according to a [Form 4 filed](https://www.sec.gov/Archives/edgar/data/0001388390/000113778926000261/xslF345X06/wk-form4%5F1790971667.xml?ref=bullished.co) with the SEC on Friday. The transaction is the latest in a systematic sell program that has now totaled more than $114 million across five filings since September 1.

## What The Filing Says

Mosley sold 18,998 STX shares on Thursday at a weighted average price of $914.67 per share, according to the [SEC filing](https://www.sec.gov/Archives/edgar/data/0001388390/000113778926000261/xslF345X06/wk-form4%5F1790971667.xml?ref=bullished.co). The sales were spread across 28 separate tranches, with prices ranging from roughly $898 to $928 per share — all executed on the same day.

Alongside the share sale, Mosley exercised an option to acquire 14,000 shares at $46.23 per share.

After the transaction, Mosley holds 373,110.25 STX shares, valued at about $316.8 million at current prices. That remaining stake represents a reduction of roughly 5% from his pre-transaction position.

## A Second Sale The Same Day

Thursday's $17.4 million transaction was not the only disposal Mosley made that day. A separate filing also dated October 1 records the sale of 11,002 additional shares at approximately $935.60 per share — a transaction worth about $10.3 million.

Taken together, Thursday's two filings account for roughly $27.7 million in proceeds from a single trading day.

In Friday after-hours trading, STX shares edged down about 0.08% to $848.35 — well below the $897-to-$928 range at which Mosley sold on Thursday (market data).

## The Plan Behind The Sales

Every transaction is being executed under a pre-scheduled trading plan Mosley adopted on February 18, 2026, under Rule 10b5-1(c) — a mechanism that lets corporate insiders set up automatic sell programs in advance, removing any inference of trading on material non-public information.

The plan has been running for months. Across five Form 4 filings covering September 1 through October 1, Mosley disposed of about 143,610 shares valued at roughly $114.3 million in total, according to SEC filing history. Thursday's $17.4 million sale is one of two filings bearing the October 1 date.

Whether the February 2026 plan triggers additional sales will become clear in coming Form 4 filings; Seagate's next earnings report will offer the clearest read on whether the stock's elevated price levels — well above Friday's after-hours price of $848.35 — are supported by underlying business performance.

### Sources

- [Form 4 — William D Mosley (STX)](https://www.sec.gov/Archives/edgar/data/0001388390/000113778926000261/xslF345X06/wk-form4%5F1790971667.xml?ref=bullished.co) — SEC EDGAR

### More on Seagate Technology

- [Seagate CEO William Mosley Sells $10.3 Million In STX Shares Under Pre-Scheduled Plan](https://www.bullished.co/seagate-ceo-william-mosley-sells-10-3-million-in-stx-shares-under-pre-scheduled-plan-81202119/)

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