Arqit Quantum Inc.

ARQQ

Exchange: Nasdaq
Industry: Services-Prepackaged Software
SEC CIK: 0001859690

SEC filings (opens in a new tab)

In the last 90 days, Arqit Quantum Inc. insiders filed 0 open-market purchases and 7 sales; 64 institutions reported holding it in 13F filings for Q2 2026, worth $360.6M in total; no superinvestor holds it.

Holders of 5% or more of ARQQ

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Arqit Quantum Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of ARQQ
Holder	Latest form	Stake	Change	First filed	Latest filing	Filing
Heritage Assets SCSp.	13D/A	41.80%9.27M shares	−1.40 ppfrom 43.20%	May 29, 20255 filings	Nov 12, 2025	SEC
D2BW Ltd	13D/A	5.80%726.7K shares	–	Dec 18, 20241 filing	Dec 18, 2024	SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

7 Schedule 13D and 13G filings on Arqit Quantum Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on ARQQ
Filed (ET)	Filer	Form	Stake	Change	Event date	Filing
Nov 12, 20254:01 PM ET	Heritage Assets SCSp.and 2 others	13D/A	41.80%9.27M shares	−1.40 ppfrom 43.20%	Nov 10, 2025	SEC
Oct 20, 20254:20 PM ET	Heritage Assets SCSp.and 2 others	13D/A	43.20%9.59M shares	−2.80 ppfrom 46.00%	Oct 16, 2025	SEC
Sep 24, 20254:15 PM ET	Heritage Assets SCSp.and 2 others	13D/A	46.00%10.2M shares	−3.60 ppfrom 49.60%	Aug 29, 2025	SEC
Aug 26, 20254:16 PM ET	Heritage Assets SCSp.and 2 others	13D/A	49.60%10.3M shares	+13.80 ppfrom 35.80%	Aug 1, 2025	SEC
May 29, 20254:05 PM ET	Heritage Assets SCSp.and 2 others	13D/A	35.80%5.78M shares	–	May 27, 2025	SEC
Feb 10, 20254:38 PM ET	Evolution Technology Fund II, SCSP.and 1 other	13D/A	3.10%397.3K shares	–Below 5%	Sep 30, 2024	SEC
Dec 18, 20247:41 PM ET	D2BW Ltdand 2 others	13D/A	5.80%726.7K shares	–	Dec 11, 2024	SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Arqit Quantum Inc. shares.

No Form 144 notices for Arqit Quantum Inc. are on file.