Key points
- Five Seagate (STX) executives, including CEO William Mosley and CFO Gianluca Romano, filed Forms 4 on Aug. 24 covering $43.3 million in stock sold on Aug. 20 and 21.
- Mosley, Romano, and general counsel James Lee sold on their own call, no 10b5-1 plan attached.
- The sales landed at $842 to $853 a share. STX closed at $794.65 the day the filings hit.
- STX is still up more than 170% since January, even after slipping from its June high above $1,090.
Six Forms 4 reached the SEC on Aug. 24, covering sales by five Seagate (STX) executives on Aug. 20 and 21. The transactions totaled $43.3 million. CEO William Mosley, CFO Gianluca Romano and general counsel James Lee accounted for $26.4 million of that amount.
We track disclosures like these as they reach our insider trading tracker, and Seagate's complete record is on the company's filings page.
Mosley sold 18,138.5 shares on Aug. 21 at a weighted average price of $849.35, collecting $15.4 million. Romano sold 9,076.25 shares that day at the same price for $7.7 million. Lee sold 3,938.75 shares for $3.3 million.
All three left the Rule 10b5-1 checkbox blank, meaning the filings identify these as sales outside a scheduled plan, though they don't say when each executive actually decided to sell.
CTO John Christopher Morris sold 4,038.5 shares for $3.4 million under a plan he'd adopted back on Jan. 29, and chief commercial officer Ban Seng Teh submitted two filings covering 15,910 shares sold across Aug. 20 and 21 for $13.5 million, also under an established plan.
Scheduled transactions accounted for $16.9 million of the total. The remaining $26.4 million came from sales that the executives did not report under Rule 10b5-1 plans.
Seagate shares set an all-time high above $1,090 in late June. On Aug. 14, the company reported a 34% increase in full-year revenue and record free cash flow. Mosley and the other executives sold six days later at prices between $842 and $853.
STX closed at $794.65 on Aug. 24, about 6.5% below the executives' sale prices. Even after that decline, the stock had gained more than 170% since January.
Insiders sell shares for all kinds of reasons, taxes and major personal expenses among them. The forms disclose whether an executive used a Rule 10b5-1 plan, but they don't disclose the seller's actual motive, or the date a non-plan seller made the call.
That clustering is worth watching: Seagate's CEO, CFO and general counsel all sold within the same 48-hour window, right after the stock pulled back from a record. We'll see whether the next round of Form 4 filings tells a similar story.
Sources
- SEC Form 4 for William D. Mosley, filed Aug. 24, 2026 (accession 0001137789-26-000182), 18,138.5 shares sold Aug. 21 at a weighted average of $849.35
- SEC Form 4 for Gianluca Romano, filed Aug. 24, 2026 (accession 0001137789-26-000183), 9,076.25 shares sold Aug. 21 at a weighted average of $849.35
- SEC Form 4 for James C.I. Lee, filed Aug. 24, 2026 (accession 0001137789-26-000185), 3,938.75 shares sold Aug. 21 at a weighted average of $849.35
- SEC Form 4 for John Christopher Morris, filed Aug. 24, 2026 (accession 0001137789-26-000186), 4,038.5 shares sold Aug. 20 under a 10b5-1 plan adopted Jan. 29, 2026
- SEC Forms 4 for Ban Seng Teh, filed Aug. 24, 2026 (accessions 0001137789-26-000187 and -000188), 6,048 and 9,862 shares sold Aug. 20 and 21 under a 10b5-1 plan
- Seagate fiscal Q4 and full-year 2026 results, reported Aug. 14, 2026: revenue up 34% to $12.2 billion, record free cash flow of $3.1 billion
- STX daily closing prices, June 22 through Aug. 24, 2026
