RITCHIE GARTH sold 0.4% of their position (439.00 shares) of ARQIT QUANTUM INC. on the open market

Open‑market sale worth $11.1K — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

RITCHIE GARTH

Filed: 7/6/2026ACC: 0001859690-26-000135

InsiderRITCHIE GARTHCIK 1840684

→

IssuerARQIT QUANTUM INC.CIK 1859690

Director

Since Mar 2026

-439.00

Net shares

Net seller

$11.1K

Total sold

Open market trades

0B · 1S

Total transactions

799.00 acquired · 1.24K disposed

Non-Derivative Transactions5

Ordinary Shares

Direct

M · Option Exercise

+50.00

Price / share

—

Trade value

—

% of position

0.0%

7/1/2026

104.25K→104.30K

Ordinary Shares

Direct

M · Option Exercise

+250.00

Price / share

—

Trade value

—

% of position

0.2%

7/1/2026

104.30K→104.55K

Ordinary Shares

Direct

M · Option Exercise

+250.00

Price / share

—

Trade value

—

% of position

0.2%

7/1/2026

104.55K→104.80K

Ordinary Shares

Direct

M · Option Exercise

+249.00

Price / share

—

Trade value

—

% of position

0.2%

7/1/2026

104.80K→105.05K

Ordinary Shares

Direct

S · Sale

−439.00

Price / share

$25.20

Trade value

$11.06K

% of position

0.4%

7/2/2026

105.05K→104.61K

Total

Net shares

+360.00

Net value

-$11.06K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Ordinary Shares Direct	7/1/2026	M · Option Exercise	+50.00	—	—	0.0%	104.25K	104.30K
Ordinary Shares Direct	7/1/2026	M · Option Exercise	+250.00	—	—	0.2%	104.30K	104.55K
Ordinary Shares Direct	7/1/2026	M · Option Exercise	+250.00	—	—	0.2%	104.55K	104.80K
Ordinary Shares Direct	7/1/2026	M · Option Exercise	+249.00	—	—	0.2%	104.80K	105.05K
Ordinary Shares Direct	7/2/2026	S · Sale	−439.00	$25.20	$11.06K	0.4%	105.05K	104.61K
Total			+360.00		-$11.06K

Derivative Transactions4

Restricted Share Units

Direct

M · Option Exercise

Converts to

Ordinary Shares

50.00 shares

−50.00

Strike price

Held after

0.00

Exercisable

—

7/1/2026

Restricted Share Units

Direct

M · Option Exercise

Converts to

Ordinary Shares

250.00 shares

−250.00

Strike price

Held after

Exercisable

—

7/1/2026

Restricted Share Units

Direct

M · Option Exercise

Converts to

Ordinary Shares

250.00 shares

−250.00

Strike price

Held after

1.25K

Exercisable

—

7/1/2026

Restricted Share Units

Direct

M · Option Exercise

Converts to

Ordinary Shares

249.00 shares

−249.00

Strike price

Held after

2.25K

Exercisable

—

7/1/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Restricted Share Units Direct	Ordinary Shares50.00 shares	7/1/2026	M · Option Exercise	−50.00	—	0.00
Restricted Share Units Direct	Ordinary Shares250.00 shares	7/1/2026	M · Option Exercise	−250.00	—	1K
Restricted Share Units Direct	Ordinary Shares250.00 shares	7/1/2026	M · Option Exercise	−250.00	—	1.25K
Restricted Share Units Direct	Ordinary Shares249.00 shares	7/1/2026	M · Option Exercise	−249.00	—	2.25K