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STX SEC Filing News — Seagate Technology Holdings plc

Latest SEC filings for Seagate Technology Holdings plc (STX) explained in plain English: insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). Sourced directly from SEC EDGAR.

What you’re looking at: Each item below is parsed from an actual SEC filing. Form 4 = confirmed insider transaction · Form 144 = proposed sale notice · 8-K = material event (earnings, M&A, leadership change, etc.) · 10-Q / 10-K = quarterly / annual report.
Form 4 Insider Selling 2026-04-02

STX insider MOSLEY WILLIAM D (Director, CEO) sold 20,000 shares (~$8.41M)

MOSLEY WILLIAM D, listed as Director, CEO at Seagate Technology Holdings plc, reported an open-market sale of 20,000 STX shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

Filing: Form 4 (Insider Transaction) Insider: MOSLEY WILLIAM D (Director, CEO) Shares: 20,000 Est. Value: $8.41M
Form 144 Large Proposed Insider Sale 2026-04-01

STX Form 144 filed for proposed insider sale by WILLIAM MOSLEY (20,000 shares) ~$15.67M

WILLIAM MOSLEY filed a Form 144 with the SEC indicating intent to sell STX (Seagate Technology Holdings plc) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: WILLIAM MOSLEY Shares: 20,000 Est. Value: $15.67M
Form 4 Insider Selling 2026-03-23

STX insider MOSLEY WILLIAM D (Director, CEO) sold 24,584 shares (~$10.00M)

MOSLEY WILLIAM D, listed as Director, CEO at Seagate Technology Holdings plc, reported an open-market sale of 24,584 STX shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

Filing: Form 4 (Insider Transaction) Insider: MOSLEY WILLIAM D (Director, CEO) Shares: 24,584 Est. Value: $10.00M
Form 4 Insider Selling 2026-03-16

STX insider Morris John Christopher (EVP & CTO) sold 112 shares (~$42.3K)

Morris John Christopher, listed as EVP & CTO at Seagate Technology Holdings plc, reported an open-market sale of 112 STX shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

Filing: Form 4 (Insider Transaction) Insider: Morris John Christopher (EVP & CTO) Shares: 112 Est. Value: $42.3K
Form 144 Proposed Insider Sale 2026-03-13

STX Form 144 filed for proposed insider sale by JOHN MORRIS (112 shares) ~$83.8K

JOHN MORRIS filed a Form 144 with the SEC indicating intent to sell STX (Seagate Technology Holdings plc) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: JOHN MORRIS Shares: 112 Est. Value: $83.8K
Form 4 Tax / Compensation Filing 2026-03-12

STX insider Form 4 filed for equity award, exercise, or tax withholding

Teh Ban Seng (EVP & Chief Commercial Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Teh Ban Seng (EVP & Chief Commercial Officer) Shares: 989
Form 4 Tax / Compensation Filing 2026-03-12

STX insider Form 4 filed for equity award, exercise, or tax withholding

Romano Gianluca (EVP & CFO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Romano Gianluca (EVP & CFO) Shares: 2,542
Form 4 Tax / Compensation Filing 2026-03-12

STX insider Form 4 filed for equity award, exercise, or tax withholding

Chong Kian Fatt (EVP Global Operations) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Chong Kian Fatt (EVP Global Operations) Shares: 678
Form 4 Tax / Compensation Filing 2026-03-12

STX insider Form 4 filed for equity award, exercise, or tax withholding

Morris John Christopher (EVP & CTO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Morris John Christopher (EVP & CTO) Shares: 1,372
Form 4 Tax / Compensation Filing 2026-03-12

STX insider Form 4 filed for equity award, exercise, or tax withholding

MOSLEY WILLIAM D (Director, CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: MOSLEY WILLIAM D (Director, CEO) Shares: 4,977
Form 4 Tax / Compensation Filing 2026-03-11

STX insider Form 4 filed for equity award, exercise, or tax withholding

Morris John Christopher (EVP & CTO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Morris John Christopher (EVP & CTO) Shares: 1,646
Form 4 Tax / Compensation Filing 2026-03-11

STX insider Form 4 filed for equity award, exercise, or tax withholding

Romano Gianluca (EVP & CFO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Romano Gianluca (EVP & CFO) Shares: 3,709
Form 4 Tax / Compensation Filing 2026-03-11

STX insider Form 4 filed for equity award, exercise, or tax withholding

MOSLEY WILLIAM D (Director, CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: MOSLEY WILLIAM D (Director, CEO) Shares: 7,843
Form 4 Tax / Compensation Filing 2026-03-11

STX insider Form 4 filed for equity award, exercise, or tax withholding

Chong Kian Fatt (EVP Global Operations) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Chong Kian Fatt (EVP Global Operations) Shares: 581
Form 4 Tax / Compensation Filing 2026-03-11

STX insider Form 4 filed for equity award, exercise, or tax withholding

Teh Ban Seng (EVP & Chief Commercial Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Filing: Form 4 (Insider Transaction) Insider: Teh Ban Seng (EVP & Chief Commercial Officer) Shares: 1,262
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