Form4insider filings, from the source

Company · CIK 0001859690 · SIC 7372 — Services-Prepackaged Software · Nasdaq

Arqit Quantum Inc. · ARQQ

Insider activity reported against this company. All insider holders · On EDGAR ↗

1M3M6M1Y2YAll datashares as filed — not split-adjusted
Open-market buys & salesbuys $0 · 0sales $2.1M · 7net −$2.1M
$10k$10k$100k$100k$1M$1M$10M$10MbuyssalesJun 28Jul 13Jul 28Aug 13Aug 28Sep 13Sep 28

Reported at this company — common stock

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Sep 22, 2026 XForm 4 →Sep 23, 4:30 pm EDTd'Ovidio Manfredi LefebvreDirector4,600,000$2.50$11,500,0008,942,448—
Jul 17, 2026 MForm 4 →Jul 21, 2:16 pm EDTCarlo CalabriaDirector757——232,478—
Jul 17, 2026 MForm 4 →Jul 21, 2:10 pm EDTd'Ovidio Manfredi LefebvreDirector673——49,023—
Jul 17, 2026 MForm 4 →Jul 21, 2:09 pm EDTGarth RitchieDirector841——105,450—
Jul 2, 2026 SForm 4 →Jul 6, 5:46 pm EDTPatrick WillcocksGeneral Counsel2,009$25.20$50,6329,462−17.5%
Jul 2, 2026 SForm 4 →Jul 6, 5:18 pm EDTGarth RitchieDirector439$25.20$11,064104,609−0.42%
Jul 2, 2026 SForm 4 →Jul 6, 5:13 pm EDTAndrew LeaverChief Executive Officer9,893$25.20$249,32951,483−16.1%
Jul 2, 2026 SForm 4 →Jul 6, 4:11 pm EDTBen Simon WilderChief Operating Officer769$25.20$19,3813,582−17.7%
Jul 2, 2026 SForm 4 →Jul 6, 3:24 pm EDTPaul FeenanChief Revenue Officer1,834$25.20$46,22219,351−8.66%
Jul 1, 2026 MForm 4 →Jul 6, 6:33 pm EDTd'Ovidio Manfredi LefebvreDirector4,133——48,350—
Jul 1, 2026 MForm 4 →Jul 6, 6:09 pm EDTCarlo CalabriaDirector799——231,721—
Jul 1, 2026 MForm 4 →Jul 6, 5:46 pm EDTPatrick WillcocksGeneral Counsel3,555——11,471—
Jul 1, 2026 MForm 4 →Jul 6, 5:18 pm EDTGarth RitchieDirector799——105,048—
Jul 1, 2026 MForm 4 →Jul 6, 5:13 pm EDTAndrew LeaverChief Executive Officer15,625——61,376—
Jul 1, 2026 MForm 4 →Jul 6, 4:11 pm EDTBen Simon WilderChief Operating Officer1,333——4,351—
Jul 1, 2026 MForm 4 →Jul 6, 3:24 pm EDTPaul FeenanChief Revenue Officer3,222——21,185—
Jun 30, 2026 SForm 4 →Jul 2, 4:51 pm EDTd'Ovidio Manfredi LefebvreDirector54,444$30.17$1,642,6434,342,448−1.24%
Jun 30, 2026 SForm 4 →Jul 2, 11:16 am EDTPatrick WillcocksGeneral Counsel4,000$29.48$117,9207,916−33.6%

Reported at this company — derivatives (options, RSUs, warrants)

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Sep 22, 2026 XForm 4 →Sep 23, 4:30 pm EDTd'Ovidio Manfredi LefebvreDirector4,600,000——0—
Jul 17, 2026 MForm 4 →Jul 21, 2:16 pm EDTCarlo CalabriaDirector757——0—
Jul 17, 2026 MForm 4 →Jul 21, 2:10 pm EDTd'Ovidio Manfredi LefebvreDirector673——0—
Jul 17, 2026 MForm 4 →Jul 21, 2:09 pm EDTGarth RitchieDirector841——0—
Jul 15, 2026 AForm 4 →Jul 17, 6:23 pm EDTCarlo CalabriaDirector757——757—
Jul 15, 2026 AForm 4 →Jul 17, 6:22 pm EDTGarth RitchieDirector841——841—
Jul 15, 2026 AForm 4 →Jul 17, 6:21 pm EDTd'Ovidio Manfredi LefebvreDirector673——673—
Jul 9, 2026 SForm 4 →Jul 13, 4:05 pm EDTd'Ovidio Manfredi LefebvreDirector412$1.19$49014,097—
Jul 7, 2026 SForm 4 →Jul 9, 4:05 pm EDTd'Ovidio Manfredi LefebvreDirector150$1.34$20114,509—
Jul 2, 2026 SForm 4 →Jul 7, 4:26 pm EDTd'Ovidio Manfredi LefebvreDirector133$1.25$16714,659—
Jul 1, 2026 MForm 4 →Jul 6, 6:33 pm EDTd'Ovidio Manfredi LefebvreDirector4,133——2,250—
Jul 1, 2026 MForm 4 →Jul 6, 6:09 pm EDTCarlo CalabriaDirector799——2,250—
Jul 1, 2026 MForm 4 →Jul 6, 5:46 pm EDTPatrick WillcocksGeneral Counsel3,555——8,240—
Jul 1, 2026 MForm 4 →Jul 6, 5:18 pm EDTGarth RitchieDirector799——2,250—
Jul 1, 2026 MForm 4 →Jul 6, 5:13 pm EDTAndrew LeaverChief Executive Officer15,625——203,125—
Jul 1, 2026 MForm 4 →Jul 6, 4:11 pm EDTBen Simon WilderChief Operating Officer1,333——4,500—
Jul 1, 2026 MForm 4 →Jul 6, 3:24 pm EDTPaul FeenanChief Revenue Officer3,222——8,690—
Jun 30, 2026 SForm 4 →Jul 2, 4:51 pm EDTd'Ovidio Manfredi LefebvreDirector195$1.56$30414,792—