MOSLEY WILLIAM D (CEO) sold 5.5% of their position (18.14K shares) of SEAGATE TECHNOLOGY HOLDINGS PLC on the open market

Open‑market sale worth $15.41M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 3 sales

MOSLEY WILLIAM D

Filed: 8/24/2026ACC: 0001137789-26-000182

InsiderMOSLEY WILLIAM DCIK 1388390

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IssuerSEAGATE TECHNOLOGY HOLDINGS PLCCIK 1137789

DirectorOfficer· CEO

Since Mar 2026

+25.89K

Net shares

Net buyer

$15.41M

Total sold

Open market trades

0B · 3S

Total transactions

77.82K acquired · 51.93K disposed

Non-Derivative Transactions6

Ordinary Shares

Direct

M · Option Exercise

+6.40K

Price / share

—

Trade value

—

% of position

2.2%

8/20/2026

295.52K→301.92K

Ordinary Shares

Direct

M · Option Exercise

+21.07K

Price / share

—

Trade value

—

% of position

7.1%

8/20/2026

298.48K→319.55K

Ordinary Shares

Direct

M · Option Exercise

+6.32K

Price / share

—

Trade value

—

% of position

2.1%

8/20/2026

308.24K→314.56K

Ordinary Shares

Direct

S · Sale

−3.44K

Price / share

$849.35

Trade value

$2.92M

% of position

1.1%

8/21/2026

301.92K→298.48K

Ordinary Shares

Direct

S · Sale

−11.31K

Price / share

$849.35

Trade value

$9.60M

% of position

3.5%

8/21/2026

319.55K→308.24K

Ordinary Shares

Direct

S · Sale

−3.39K

Price / share

$849.35

Trade value

$2.88M

% of position

1.1%

8/21/2026

314.56K→311.17K

Total

Net shares

+15.65K

Net value

-$15.41M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Ordinary Shares Direct	8/20/2026	M · Option Exercise	+6.40K	—	—	2.2%	295.52K	301.92K
Ordinary Shares Direct	8/20/2026	M · Option Exercise	+21.07K	—	—	7.1%	298.48K	319.55K
Ordinary Shares Direct	8/20/2026	M · Option Exercise	+6.32K	—	—	2.1%	308.24K	314.56K
Ordinary Shares Direct	8/21/2026	S · Sale	−3.44K	$849.35	$2.92M	1.1%	301.92K	298.48K
Ordinary Shares Direct	8/21/2026	S · Sale	−11.31K	$849.35	$9.60M	3.5%	319.55K	308.24K
Ordinary Shares Direct	8/21/2026	S · Sale	−3.39K	$849.35	$2.88M	1.1%	314.56K	311.17K
Total			+15.65K		-$15.41M

Derivative Transactions7

Restricted Share Unit

Direct

M · Option Exercise

Converts to

Ordinary Shares

6.40K shares

−6.40K

Strike price

Held after

19.21K

Exercisable

—

8/20/2026

Restricted Share Unit

Direct

M · Option Exercise

Converts to

Ordinary Shares

6.32K shares

−6.32K

Strike price

Held after

0.00

Exercisable

—

8/20/2026

Restricted Share Unit

Direct

M · Option Exercise

Converts to

Ordinary Shares

21.07K shares

−21.07K

Strike price

Held after

0.00

Exercisable

—

8/20/2026

Restricted Share Unit

Direct

A · Award

Converts to

Ordinary Shares

5.31K shares

+5.31K

Strike price

Held after

5.31K

Exercisable

—

8/20/2026

Restricted Share Unit

Direct

A · Award

Converts to

Ordinary Shares

5.28K shares

+5.28K

Strike price

Held after

5.28K

Exercisable

—

8/20/2026

Restricted Share Unit

Direct

A · Award

Converts to

Ordinary Shares

1.58K shares

+1.58K

Strike price

Held after

1.58K

Exercisable

—

8/20/2026

NQ Stock Option

Direct

A · Award

Converts to

Ordinary Shares

31.86K shares

+31.86K

Strike price

850.24

Held after

31.86K

Exercisable

—

8/20/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Share Unit Direct	Ordinary Shares6.40K shares	8/20/2026	M · Option Exercise	−6.40K	0	—	19.21K
Restricted Share Unit Direct	Ordinary Shares6.32K shares	8/20/2026	M · Option Exercise	−6.32K	0	—	0.00
Restricted Share Unit Direct	Ordinary Shares21.07K shares	8/20/2026	M · Option Exercise	−21.07K	0	—	0.00
Restricted Share Unit Direct	Ordinary Shares5.31K shares	8/20/2026	A · Award	+5.31K	0	—	5.31K
Restricted Share Unit Direct	Ordinary Shares5.28K shares	8/20/2026	A · Award	+5.28K	0	—	5.28K
Restricted Share Unit Direct	Ordinary Shares1.58K shares	8/20/2026	A · Award	+1.58K	0	—	1.58K
NQ Stock Option Direct	Ordinary Shares31.86K shares	8/20/2026	A · Award	+31.86K	850.24	—	31.86K