ABBEY WILLIAM (Chief Commercial Officer) sold 15.0% of their position (10.15K shares) of ARM HOLDINGS PLC /UK on the open market

Open‑market sale worth $2.15M — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 3 sales

ABBEY WILLIAM

Filed: 5/19/2026ACC: 0001973239-26-000078

InsiderABBEY WILLIAMCIK 1945497

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IssuerARM HOLDINGS PLC /UKCIK 1973239

Officer· Chief Commercial Officer

Since Mar 2026

+3.40K

Net shares

Net buyer

$5.36M

Total sold

Open market trades

0B · 3S

Total transactions

37.08K acquired · 33.67K disposed

Non-Derivative Transactions10

Ordinary Shares

Direct

S · Sale

−1.58K

Price / share

$199.00

Trade value

$313.82K

% of position

2.8%

4/23/2026

55.82K→54.24K

Ordinary Shares

Direct

S · Sale

−1.58K

Price / share

$221.99

Trade value

$350.08K

% of position

2.7%

4/24/2026

57.39K→55.82K

Ordinary Shares

Direct

A · Award

+4.47K

Price / share

—

Trade value

—

% of position

9.3%

5/15/2026

48.20K→52.67K

Ordinary Shares

Direct

M · Option Exercise

+1.75K

Price / share

—

Trade value

—

% of position

3.3%

5/15/2026

52.67K→54.42K

Ordinary Shares

Direct

A · Award

+4.44K

Price / share

—

Trade value

—

% of position

8.2%

5/15/2026

54.42K→58.86K

Ordinary Shares

Direct

M · Option Exercise

+1.74K

Price / share

—

Trade value

—

% of position

3.0%

5/15/2026

58.86K→60.60K

Ordinary Shares

Direct

A · Award

+14.40K

Price / share

—

Trade value

—

% of position

23.8%

5/15/2026

60.60K→75K

Ordinary Shares

Direct

M · Option Exercise

+4.71K

Price / share

—

Trade value

—

% of position

6.3%

5/15/2026

75K→79.71K

Ordinary Shares

Direct

F · Tax Withholding

−15.32K

Price / share

$209.16

Trade value

$3.20M

% of position

19.2%

5/15/2026

79.71K→64.39K

Ordinary Shares

Direct

S · Sale

−7K

Price / share

$212.55

Trade value

$1.49M

% of position

10.9%

5/15/2026

64.39K→57.39K

Total

Net shares

+6.04K

Net value

-$5.36M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Ordinary Shares Direct	4/23/2026	S · Sale	−1.58K	$199.00	$313.82K	2.8%	55.82K	54.24K
Ordinary Shares Direct	4/24/2026	S · Sale	−1.58K	$221.99	$350.08K	2.7%	57.39K	55.82K
Ordinary Shares Direct	5/15/2026	A · Award	+4.47K	—	—	9.3%	48.20K	52.67K
Ordinary Shares Direct	5/15/2026	M · Option Exercise	+1.75K	—	—	3.3%	52.67K	54.42K
Ordinary Shares Direct	5/15/2026	A · Award	+4.44K	—	—	8.2%	54.42K	58.86K
Ordinary Shares Direct	5/15/2026	M · Option Exercise	+1.74K	—	—	3.0%	58.86K	60.60K
Ordinary Shares Direct	5/15/2026	A · Award	+14.40K	—	—	23.8%	60.60K	75K
Ordinary Shares Direct	5/15/2026	M · Option Exercise	+4.71K	—	—	6.3%	75K	79.71K
Ordinary Shares Direct	5/15/2026	F · Tax Withholding	−15.32K	$209.16	$3.20M	19.2%	79.71K	64.39K
Ordinary Shares Direct	5/15/2026	S · Sale	−7K	$212.55	$1.49M	10.9%	64.39K	57.39K
Total			+6.04K		-$5.36M

Derivative Transactions4

Restricted Stock Units

Direct

A · Award

Converts to

Ordinary Shares

5.57K shares

+5.57K

Strike price

Held after

56.18K

Exercisable

—

5/15/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Ordinary Shares

1.75K shares

−1.75K

Strike price

Held after

54.43K

Exercisable

—

5/15/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Ordinary Shares

1.74K shares

−1.74K

Strike price

Held after

52.69K

Exercisable

—

5/15/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Ordinary Shares

4.71K shares

−4.71K

Strike price

Held after

47.98K

Exercisable

—

5/15/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Restricted Stock Units Direct	Ordinary Shares5.57K shares	5/15/2026	A · Award	+5.57K	—	56.18K
Restricted Stock Units Direct	Ordinary Shares1.75K shares	5/15/2026	M · Option Exercise	−1.75K	—	54.43K
Restricted Stock Units Direct	Ordinary Shares1.74K shares	5/15/2026	M · Option Exercise	−1.74K	—	52.69K
Restricted Stock Units Direct	Ordinary Shares4.71K shares	5/15/2026	M · Option Exercise	−4.71K	—	47.98K