MOSLEY WILLIAM D (CEO) sold 8.1% of their position (30K shares) of SEAGATE TECHNOLOGY HOLDINGS PLC on the open market

Open‑market sale worth $22.54M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 19 sales

MOSLEY WILLIAM D

Filed: 5/21/2026ACC: 0001137789-26-000106

InsiderMOSLEY WILLIAM DCIK 1388390

→

IssuerSEAGATE TECHNOLOGY HOLDINGS PLCCIK 1137789

DirectorOfficer· CEO

Since Mar 2026

-30K

Net shares

Net seller

$22.54M

Total sold

Open market trades

0B · 19S

Total transactions

14K acquired · 44K disposed

Non-Derivative Transactions20

Ordinary Shares

Direct

M · Option Exercise

+14K

Price / share

$46.23

Trade value

$647.22K

% of position

3.9%

5/20/2026

355.59K→369.59K

Ordinary Shares

Direct

S · Sale

−120.00

Price / share

$742.00

Trade value

$89.04K

% of position

0.0%

5/20/2026

369.59K→369.47K

Ordinary Shares

Direct

S · Sale

−560.00

Price / share

$743.14

Trade value

$416.16K

% of position

0.2%

5/20/2026

369.47K→368.91K

Ordinary Shares

Direct

S · Sale

−840.00

Price / share

$744.52

Trade value

$625.39K

% of position

0.2%

5/20/2026

368.91K→368.07K

Ordinary Shares

Direct

S · Sale

−1.26K

Price / share

$745.55

Trade value

$942.38K

% of position

0.3%

5/20/2026

368.07K→366.81K

Ordinary Shares

Direct

S · Sale

−1.46K

Price / share

$746.53

Trade value

$1.09M

% of position

0.4%

5/20/2026

366.81K→365.34K

Ordinary Shares

Direct

S · Sale

−1.60K

Price / share

$747.64

Trade value

$1.20M

% of position

0.4%

5/20/2026

365.34K→363.74K

Ordinary Shares

Direct

S · Sale

−1.72K

Price / share

$748.53

Trade value

$1.29M

% of position

0.5%

5/20/2026

363.74K→362.02K

Ordinary Shares

Direct

S · Sale

−1.62K

Price / share

$749.67

Trade value

$1.21M

% of position

0.4%

5/20/2026

362.02K→360.40K

Ordinary Shares

Direct

S · Sale

−4.81K

Price / share

$750.84

Trade value

$3.61M

% of position

1.3%

5/20/2026

360.40K→355.59K

Ordinary Shares

Direct

S · Sale

−4.21K

Price / share

$751.75

Trade value

$3.16M

% of position

1.2%

5/20/2026

355.59K→351.38K

Ordinary Shares

Direct

S · Sale

−3.18K

Price / share

$752.72

Trade value

$2.40M

% of position

0.9%

5/20/2026

351.38K→348.20K

Ordinary Shares

Direct

S · Sale

−2.71K

Price / share

$753.69

Trade value

$2.04M

% of position

0.8%

5/20/2026

348.20K→345.50K

Ordinary Shares

Direct

S · Sale

−2.16K

Price / share

$754.70

Trade value

$1.63M

% of position

0.6%

5/20/2026

345.50K→343.33K

Ordinary Shares

Direct

S · Sale

−1.66K

Price / share

$755.72

Trade value

$1.26M

% of position

0.5%

5/20/2026

343.33K→341.67K

Ordinary Shares

Direct

S · Sale

−1.48K

Price / share

$756.83

Trade value

$1.12M

% of position

0.4%

5/20/2026

341.67K→340.19K

Ordinary Shares

Direct

S · Sale

−320.00

Price / share

$758.05

Trade value

$242.58K

% of position

0.1%

5/20/2026

340.19K→339.87K

Ordinary Shares

Direct

S · Sale

−80.00

Price / share

$758.65

Trade value

$60.69K

% of position

0.0%

5/20/2026

339.87K→339.79K

Ordinary Shares

Direct

S · Sale

−80.00

Price / share

$760.49

Trade value

$60.84K

% of position

0.0%

5/20/2026

339.79K→339.71K

Ordinary Shares

Direct

S · Sale

−120.00

Price / share

$763.18

Trade value

$91.58K

% of position

0.0%

5/20/2026

339.71K→339.59K

Total

Net shares

−16K

Net value

-$21.89M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Ordinary Shares Direct	5/20/2026	M · Option Exercise	+14K	$46.23	$647.22K	3.9%	355.59K	369.59K
Ordinary Shares Direct	5/20/2026	S · Sale	−120.00	$742.00	$89.04K	0.0%	369.59K	369.47K
Ordinary Shares Direct	5/20/2026	S · Sale	−560.00	$743.14	$416.16K	0.2%	369.47K	368.91K
Ordinary Shares Direct	5/20/2026	S · Sale	−840.00	$744.52	$625.39K	0.2%	368.91K	368.07K
Ordinary Shares Direct	5/20/2026	S · Sale	−1.26K	$745.55	$942.38K	0.3%	368.07K	366.81K
Ordinary Shares Direct	5/20/2026	S · Sale	−1.46K	$746.53	$1.09M	0.4%	366.81K	365.34K
Ordinary Shares Direct	5/20/2026	S · Sale	−1.60K	$747.64	$1.20M	0.4%	365.34K	363.74K
Ordinary Shares Direct	5/20/2026	S · Sale	−1.72K	$748.53	$1.29M	0.5%	363.74K	362.02K
Ordinary Shares Direct	5/20/2026	S · Sale	−1.62K	$749.67	$1.21M	0.4%	362.02K	360.40K
Ordinary Shares Direct	5/20/2026	S · Sale	−4.81K	$750.84	$3.61M	1.3%	360.40K	355.59K
Ordinary Shares Direct	5/20/2026	S · Sale	−4.21K	$751.75	$3.16M	1.2%	355.59K	351.38K
Ordinary Shares Direct	5/20/2026	S · Sale	−3.18K	$752.72	$2.40M	0.9%	351.38K	348.20K
Ordinary Shares Direct	5/20/2026	S · Sale	−2.71K	$753.69	$2.04M	0.8%	348.20K	345.50K
Ordinary Shares Direct	5/20/2026	S · Sale	−2.16K	$754.70	$1.63M	0.6%	345.50K	343.33K
Ordinary Shares Direct	5/20/2026	S · Sale	−1.66K	$755.72	$1.26M	0.5%	343.33K	341.67K
Ordinary Shares Direct	5/20/2026	S · Sale	−1.48K	$756.83	$1.12M	0.4%	341.67K	340.19K
Ordinary Shares Direct	5/20/2026	S · Sale	−320.00	$758.05	$242.58K	0.1%	340.19K	339.87K
Ordinary Shares Direct	5/20/2026	S · Sale	−80.00	$758.65	$60.69K	0.0%	339.87K	339.79K
Ordinary Shares Direct	5/20/2026	S · Sale	−80.00	$760.49	$60.84K	0.0%	339.79K	339.71K
Ordinary Shares Direct	5/20/2026	S · Sale	−120.00	$763.18	$91.58K	0.0%	339.71K	339.59K
Total			−16K		-$21.89M

Derivative Transactions1

NQ Options

Direct

M · Option Exercise

Converts to

Ordinary Shares

14K shares

−14K

Strike price

46.23

Held after

153.10K

Exercisable

—

5/20/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
NQ Options Direct	Ordinary Shares14K shares	5/20/2026	M · Option Exercise	−14K	46.23	—	153.10K