A factual record of completed and announced acquisitions and majority-stake purchases, each from the sources named with the date read: official sources (a release of the acquirer or the target, a filing or a screening decision), or a named press source where no official one could be read, then marked partly verified. Announced deals that are not completed are listed apart with their status. It contains no prediction, rumour or rating, and it is not exhaustive.
Which quantum-technology companies changed hands since 2018: European companies bought by acquirers inside and outside Europe, acquisitions by European companies, and the deals of the most active acquirers worldwide. Regions: EU, EEA outside the EU, United Kingdom and Switzerland count as Europe.
Verified Completion release (also filed as 8-K Ex. 99.1) dated 31 Jul 2026. Per-share consideration only: '$15.00 in cash and 0.4883 shares of IonQ common stock for each share of SkyWater common stock'; no aggregate value read in an official source, so value=null (news cite ~USD 1.8bn). 28 Jul 2026 release reports regulatory approval incl. early termination of US review. Announcement (Jan 2026) date not read in an official release.
Acquirer
IonQ (United States) [North America]
Target
SkyWater (United States) [North America]
Announced
not stated in the sources read
Completed
2026-07-31
Stake
merger; SkyWater to operate as a wholly owned subsidiary of IonQ (per 28 Jul 2026 release)
Published value
Not officially published
Segment
Chips, materials, vacuum and fabrication: US semiconductor foundry (Trusted Foundry), providing IonQ a secure quantum foundry
Sources:
IonQ, Inc. (8-K Ex. 99.1)Regulatory filing; First paragraph: today completed its acquisition of SkyWater Technology; read 2026-10-26
for a combination of cash and QCi stock valued at $73.1 million, subject to customary adjustments ... up to an additional $72.0 million if certain performance targets are achieved (Regulatory filing)
Segment
Adjacent technology bought by a quantum company (not quantum): advanced semiconductor packaging, chiplets, photonic-device integration
SEALSQAcquirer release; First paragraph; read 2026-10-26
SEALSQAcquirer release; 24 Mar 2026 entry: letter of intent to acquire 100% of Miraex; read 2026-10-26
Quantum Machines and QHarbor
Partly verified Quantum Machines press release page returned 403; read Tech.eu report of 5 May 2026 ('today announced the acquisition of Dutch company QHarbor'). Terms not disclosed.
Acquirer
Quantum Machines (Israel) [Rest of the world]
Target
QHarbor (Netherlands) [European Union]
Announced
2026-05-05
Completed
announced 2026-05-05, closing date not published
Stake
acquisition of Dutch company QHarbor (percentage not stated)
Published value
Not officially published
Segment
Quantum software and algorithms: quantum measurement-data management and software-defined experimentation platform (TU Delft spin-off)
Verified 8-K states completion on 30 Jan 2026 (Membership Interest Purchase Agreement dated 20 Jan 2026); consideration from Q2 2026 10-Q. Target is not itself a quantum company; included as a deal by a serial quantum acquirer.
Acquirer
IonQ (United States) [North America]
Target
Seed Innovations (United States) [North America]
Announced
not stated in the sources read
Completed
2026-01-30
Stake
all equity interests in Seed Innovations, LLC
Published value
for approximately $30.1 million of total consideration (Regulatory filing)
Segment
Adjacent technology bought by a quantum company (not quantum): software and machine-learning R&D
IonQ, Inc. (SEC 10-Q Q2 2026)Regulatory filing; Business combinations note, Seed Innovations paragraph; read 2026-10-26
IonQ and Skyloom
Verified 8-K (filed for event 26 Jan 2026) states completion on 26 Jan 2026 and merger agreement dated 6 Nov 2025; consideration from Q2 2026 10-Q business-combinations note.
Acquirer
IonQ (United States) [North America]
Target
Skyloom (United States) [North America]
Announced
not stated in the sources read
Completed
2026-01-26
Stake
acquired Skyloom Global Corp. (merger agreement dated 6 Nov 2025; percentage not stated)
Published value
for approximately $188.5 million of total consideration (Regulatory filing)
Segment
Adjacent technology bought by a quantum company (not quantum): free-space optical (laser) communications, photonic systems engineering, secure data transmission
Verified Agreement release 7 Jan 2026 and completion release 20 Jan 2026, both filed as 8-K exhibits. stake_percent 100 inferred from merger structure.
Acquirer
D-Wave (United States) [North America]
Target
Quantum Circuits (United States) [North America]
Announced
2026-01-07
Completed
2026-01-20
Stake
merger agreement under which D-Wave will acquire Quantum Circuits
Published value
for a purchase price of $550 million, consisting of $300 million in D-Wave common stock and $250 million in cash (Regulatory filing)
Verified Quantum Design release dated 2 Jan 2026 announces 'the completion of the acquisition'; completed = release date (exact closing date not stated). Agreement and price from Oxford Instruments release of 10 Jun 2025. Business now operates as Quantum Design Oxford.
Partly verified No release of the acquirer or the target could be read (the Venture Kick and Venturelab pages answered HTTP 503; htgf.de is not used under its robots.txt content signal). News reports of 3 to 9 June 2026 state the acquisition as made. Terms not disclosed.
Qnami has been acquired by Quantum Design (percentage not stated)
Published value
Not officially published
Segment
Quantum sensing, clocks and navigation: diamond NV-centre quantum sensing and scanning probe microscopy
Sources:
chemeurope.com (LUMITOS AG)News report (second source only); News item of 9 June 2026: Qnami has been acquired by Quantum Design International; read 2026-10-26
Partly verified Read the Quantum Machines announcement as republished by I-Connect007 (dated 25 Jun 2026); Quantum Computing Report archive lists it on 17 Jun 2026. Exact announcement/closing date not confirmed on the acquirer's own site. Value not disclosed.
Acquirer
Quantum Machines (Israel) [Rest of the world]
Target
PCB Design (Hungary) [European Union]
Announced
not stated in the sources read
Completed
June 2026
Stake
acquisition of Hungarian company PCB Engineering/PCB Design (percentage not stated)
Published value
Not officially published
Segment
Control and readout electronics, test and measurement: high-speed, high-density electronic hardware design (for quantum control systems); Budapest R&D hub
Verified Closing date and consideration from IonQ FY2025 10-K Note 3.
Acquirer
IonQ (United States) [North America]
Target
Vector Atomic (United States) [North America]
Announced
not stated in the sources read
Completed
2025-10-02
Stake
acquired Vector Atomic, Inc. (percentage not stated)
Published value
the Company acquired Vector Atomic, Inc. ("Vector Atomic") for approximately $181.5 million of stock consideration (Regulatory filing)
Segment
Quantum sensing, clocks and navigation: quantum sensing (atomic clocks and sensors)
Sources:
IonQ, Inc. (SEC 10-K FY2025)Regulatory filing; Note 3 Business Combinations, Vector Atomic paragraph; read 2026-10-26
IonQ and Oxford Ionics
Verified IonQ FY2025 10-K Note 3 gives closing 16 Sep 2025 and total consideration (accounting fair value; differs from the ~USD 1.075bn headline reported in news at announcement, which was not read in an official source). 10-K Item 5 cites a Share Purchase Agreement dated 7 June 2025; public announcement date not read officially, so announced=null. Completion press release dated 17 Sep 2025.
Acquirer
IonQ (United States) [North America]
Target
Oxford Ionics (United Kingdom) [United Kingdom]
Announced
not stated in the sources read
Completed
2025-09-16
Stake
acquired Oxford Ionics Limited (percentage not stated in sources read)
Published value
the Company acquired Oxford Ionics Limited ("Oxford Ionics") for approximately $1,589.7 million of total consideration (Regulatory filing)
Segment
Quantum computers and processors: trapped-ion quantum computing (ion traps manufactured on standard semiconductor chips)
Sources:
IonQ, Inc. (SEC 10-K FY2025)Regulatory filing; Note 3 Business Combinations, Oxford Ionics paragraph; read 2026-10-26
IonQ, Inc. (8-K Ex. 99.1)Regulatory filing; First paragraph: announced the successful completion of its acquisition of Oxford Ionics; read 2026-10-26
IonQAcquirer release; Dateline 17 Sep 2025, first paragraph; read 2026-10-26
SEALSQ and IC'Alps
Verified SEALSQ release of 4 Aug 2025: completion after final approval from the French Ministry of the Economy, Finance and Industrial and Digital Sovereignty (French FDI control). Target confirms 100% ownership. Target is not itself a quantum company; acquirer is a post-quantum semiconductor company.
Acquirer
SEALSQ (Switzerland) [Switzerland]
Target
IC'Alps (France) [European Union]
Announced
not stated in the sources read
Completed
2025-08-04
Stake
100% of the share capital and voting rights of IC'ALPS SAS
Published value
a total fixed purchase price of EUR 12.5 million, payable in a combination of cash and SEALSQ shares (plus earn-out of up to EUR 4 million in shares) (Acquirer release)
Segment
Adjacent technology bought by a quantum company (not quantum): ASIC/SoC design services (for SEALSQ post-quantum secure chips)
Sources:
SEALSQAcquirer release; First paragraph; read 2026-10-26
Verified Closing date and consideration from IonQ FY2025 10-K Note 3; 10-K Item 5 cites the Agreement and Plan of Merger dated 7 May 2025.
Acquirer
IonQ (United States) [North America]
Target
Capella Space (United States) [North America]
Announced
not stated in the sources read
Completed
2025-07-11
Stake
acquired Capella Space Corp. (merger; percentage not stated)
Published value
the Company acquired Capella Space Corp. ("Capella") for approximately $424.8 million of total consideration (Regulatory filing)
Segment
Adjacent technology bought by a quantum company (not quantum): satellite platform (synthetic aperture radar); acquired for space-based quantum key distribution networks
Verified Pasqal release of 3 Jun 2025 announces the acquisition as done. Search results attribute to Pasqal SEC registration filings an acquisition of 100% on 29 Jul 2024 with a post-closing Canadian national-security review completed March 2025, but those filings exceeded fetch size and were not read, so completed=null.
announced the acquisition of AEPONYX (percentage not stated in release)
Published value
Not officially published
Segment
Photonics, lasers and detectors: photonic integrated circuits (silicon nitride + MEMS) for neutral-atom qubit control
Sources:
PasqalAcquirer release; Dateline Paris, 3 Jun 2025, first paragraph; read 2026-10-26
IonQ and Lightsynq
Verified Closing date and consideration from IonQ FY2025 10-K Note 3.
Acquirer
IonQ (United States) [North America]
Target
Lightsynq (United States) [North America]
Announced
not stated in the sources read
Completed
2025-05-30
Stake
acquired Lightsynq Technologies Inc. (percentage not stated)
Published value
the Company acquired Lightsynq Technologies Inc. ("Lightsynq") for approximately $306.2 million of total consideration (Regulatory filing)
Segment
QKD, quantum networking and memories: quantum memory and photonic interconnects for quantum networking
Sources:
IonQ, Inc. (SEC 10-K FY2025)Regulatory filing; Note 3 Business Combinations, Lightsynq paragraph; read 2026-10-26
IonQ and ID Quantique
Verified Closing date, stake and consideration from IonQ FY2025 10-K Note 3. IonQ completion press release dated 6 May 2025. Definitive agreements were announced in February 2025 (day not read in an official source). Seller of the majority stake was SK Telecom (see separate 2018 entry).
IonQAcquirer release; First paragraph: completion of its acquisition of a controlling stake in ID Quantique; read 2026-10-26
IonQ and Qubitekk
Verified 10-K Note 3 gives closing 27 Dec 2024; IonQ press release announcing completion is dated 6 Jan 2025. Asset acquisition structure per IonQ release.
Acquirer
IonQ (United States) [North America]
Target
Qubitekk (United States) [North America]
Announced
not stated in the sources read
Completed
2024-12-27
Stake
substantially all of the assets of Qubitekk, Inc.
Published value
the Company acquired Qubitekk Federal, LLC ("Qubitekk") for total consideration of approximately $22.1 million in cash (Regulatory filing)
Segment
QKD, quantum networking and memories: quantum networking (entangled-photon systems)
Sources:
IonQ, Inc. (SEC 10-K FY2025)Regulatory filing; Note 3 Business Combinations, 2024 acquisition (Qubitekk); read 2026-10-26
IonQAcquirer release; First paragraph: completion of its acquisition of substantially all of the assets of Qubitekk, Inc.; read 2026-10-26
Kipu Quantum and PlanQK
Partly verified Only Tech.eu report of 11 Jul 2024 read ('Kipu Quantum has acquired the German quantum computing platform PlanQK, built and commercialised by Anaqor AG'). Platform/asset acquisition, not a share deal. Terms not disclosed.
Acquirer
Kipu Quantum (Germany) [European Union]
Target
PlanQK (Germany) [European Union]
Announced
2024-07-11
Completed
announced 2024-07-11, closing date not published
Stake
acquisition of the PlanQK platform (asset deal), key team members joined
Published value
Not officially published
Segment
Quantum software and algorithms: quantum computing software/application platform
Verified Hamamatsu TSE disclosure of 31 May 2024 states PME 'has completed the procedure for acquiring all shares'; the price (incl. net debt) rose from approx. EUR 205m announced on 24 Jun 2022 to approx. EUR 247m. Danish FDI: rejected 2 May 2023, re-filed 20 Jul 2023, approved by notice of 6 May 2024 (see notes). NKT/press state integration effective 1 Jun 2024.
Verified SandboxAQ post dated 9 Jan 2024 states 'SandboxAQ has acquired Good Chemistry'; completed = announcement date. Value not officially disclosed (WSJ-sourced ~USD 75m not used).
Acquirer
SandboxAQ (United States) [North America]
Target
Good Chemistry (Canada) [North America]
Announced
2024-01-09
Completed
2024-01-09
Stake
has acquired Good Chemistry (percentage not stated)
Published value
Not officially published
Segment
Quantum software and algorithms: computational chemistry software (QEMIST Cloud, Tangelo) with quantum-computing pathway
Verified Bluefors release dated 28 Mar 2023 announces completion 'today'; intention announced 28 Feb 2023 (Bluefors release via PR Newswire). Price not disclosed.
Verified IonQ blog post dated 6 Feb 2023 states IonQ acquired Entangled Networks Ltd. (asset deal); no closing date given. News reports date the announcement to January 2023 (not used for dates). Value not disclosed. Date of the IonQ blog post announcing the acquisition.
Acquirer
IonQ (United States) [North America]
Target
Entangled Networks (Canada) [North America]
Announced
2023-02-06
Completed
announced 2023-02-06, closing date not published
Stake
deal to acquire the company's assets; team joined IonQ
Published value
Not officially published
Segment
Quantum software and algorithms: networking technologies and compilers for distributed/modular quantum systems
Sources:
IonQAcquirer release; Opening paragraphs: 'As part of the deal to acquire the company's assets'; read 2026-10-26
Groupe Gorgé and iXblue
Verified Exail release dated 29 Sep 2022; completed = release date. Included because iXblue held the Muquans quantum-sensing business; target is not a pure-play quantum company.
completes the acquisition of iXblue (percentage not stated)
Published value
Not officially published
Segment
Quantum sensing, clocks and navigation: navigation, photonics and maritime systems; owner of quantum-sensing unit from Muquans
Sources:
ExailAcquirer release; Headline and first paragraph; read 2026-10-26
SandboxAQ and Cryptosense
Verified SandboxAQ release dated 14 Sep 2022 (dateline Paris and Palo Alto) states the acquisition as done; completed = date of announcement. Target country from Paris headquarters (news/registries); release itself does not state HQ.
Acquirer
SandboxAQ (United States) [North America]
Target
Cryptosense (France) [European Union]
Announced
2022-09-14
Completed
2022-09-14
Stake
announced it has acquired Cryptosense (percentage not stated)
Published value
Not officially published
Segment
Post-quantum cryptography and quantum-safe security: cryptography inventory and analysis software (post-quantum cryptography migration)
Sources:
SandboxAQAcquirer release; First paragraph; read 2026-10-26
QCi and QPhoton
Verified 8-K Ex. 99.1 dated 16 Jun 2022 announces successful completion. Consideration is in securities only; no monetary total published, so amount=null.
Acquirer
QCi (United States) [North America]
Target
QPhoton (United States) [North America]
Announced
not stated in the sources read
Completed
2022-06-16
Stake
QPhoton becomes a wholly-owned subsidiary of QCI
Published value
Not officially published
Segment
Photonics, lasers and detectors: quantum photonics / nanophotonic systems
Verified Infleqtion audited financial statements FY2025/2024 (8-K/A Ex. 99.1) state acquisition of 100% of Super.tech on 10 May 2022; consideration in restricted shares accounted as compensation, no value stated.
Infleqtion, Inc. (SEC 8-K/A Ex. 99.1)Regulatory filing; Notes to consolidated financial statements (equity/compensation note on Super.tech); read 2026-10-26
Quantum Machines and QDevil
Partly verified Quantum Machines' own press release page returned 403; read TechCrunch report dated 30 Mar 2022 ('today announced that it has acquired QDevil'). Financial terms not disclosed. Completion date not separately stated.
Quantum MachinesAcquirer release; Not readable (HTTP 403); listed for reference; read 2026-10-26
Pasqal and My Cryo Firm
Partly verified CFNEWS (27 Jan 2023) states Pasqal bought My Cryo Firm in summer 2022; Quantum Internet Alliance page lists My Cryo Firm as part of Pasqal. No official Pasqal source read.
Partly verified No official Pasqal release could be fetched. EE Times Europe (Mar 2022) describes the companies as merging; CFNEWS (27 Jan 2023) describes Qu&Co as bought 'a year ago'. Announcement widely reported as January 2022 (exact date not read in a fetchable source).
2022 (a year before 27 January 2023, per the CFNEWS report)
Stake
merger; combined company operates as Pasqal, headquartered in Paris
Published value
Not officially published
Segment
Quantum software and algorithms: quantum algorithms and software
Sources:
EE Times EuropeNews report (second source only); Opening paragraph; read 2026-10-26
CFNEWSNews report (second source only); Paragraph on external growth (rachats de Qu & Co et My Cryo Firm); read 2026-10-26
Honeywell and Cambridge Quantum
Verified Honeywell release dated 30 Nov 2021: HQS and CQ 'received regulatory approval and completed the previously announced business combination'. Percentage not stated on the page (press reports ~54%). Announcement date (June 2021) not read in an official source.
business combination; Honeywell 'now owns a majority stake in Quantinuum'
Published value
Not officially published
Segment
Quantum software and algorithms: quantum software, algorithms and quantum cybersecurity (combined with trapped-ion hardware business)
Sources:
HoneywellAcquirer release; First paragraph (completion) and ownership paragraph; read 2026-10-26
Rohde & Schwarz and Zurich Instruments
Verified Rohde & Schwarz press release (6 Jul 2021) distributed by news aktuell/Presseportal: 'The July 1, 2021 acquisition of Zurich Instruments AG'. Value not disclosed. The R&S-hosted copy URL returned 404. The release is dated 6 July 2021, after the closing on 1 July 2021, so no separate announcement date is recorded.
Partly verified Official iXblue/Exail release of 20 May 2021 announces the acquisition of Kylia and Muquans but does not confirm closing; no completion source found. Terms not disclosed.
Partly verified Only news read (SiliconANGLE, 11 Jul 2019); no Rigetti release fetched. Value not disclosed. QxBranch had offices in Washington DC, Adelaide and London per news.
Acquirer
Rigetti (United States) [North America]
Target
QxBranch (United States) [North America]
Announced
2019-07-11
Completed
announced 2019-07-11, closing date not published
Stake
acquisition of a startup called QxBranch Inc. (percentage not stated)
Published value
Not officially published
Segment
Quantum software and algorithms: quantum computing applications and data-analytics software
Verified SK Telecom Form 6-K (2019 annual business report) Section 2.D item (25). A later 6-K reportedly gives cash consideration of KRW 55,249 million and a later increase to 65.6%, but that filing was not read, so value=null.
acquired an additional 41,157,506 shares; owns a total of 58.1% (44,157,506 shares) and has acquired control
Published value
Not officially published
Segment
QKD, quantum networking and memories: quantum key distribution, quantum random number generators, single-photon detectors
Sources:
SK Telecom Co., Ltd. (SEC Form 6-K)Regulatory filing; Section 2 Company History, D. Mergers, Acquisitions and Restructuring, item (25) Acquisition of shares of id Quantique SA; read 2026-10-26
Announced, abandoned or blocked deals
Deals that were announced officially but are not completed, or were abandoned or blocked, with their status and the date of that status. They are never counted above.
IonQ and Elisity
Verified Expected to close in Q4 2026, subject to regulatory approval.
Acquirer
IonQ (United States) [North America]
Target
Elisity (United States) [North America]
Announced
2026-10-12
Completed
not completed
Stake
definitive agreement to acquire Elisity, Inc.
Published value
all-stock transaction valued at up to $1.3 billion, including up to $150 million in earnout opportunity (Regulatory filing)
Segment
Adjacent technology bought by a quantum company (not quantum): zero-trust network security
Status
Announced, not completed (2026-10-12)
Sources:
IonQ, Inc. (8-K Ex. 99.1)Regulatory filing; First paragraph and closing-conditions paragraph; read 2026-10-26
SEALSQ and Quobly
Verified Parties 'mutually agreed to halt discussions regarding a potential majority investment or acquisition of Quobly by SEALSQ'; SEALSQ later announced a lead-investor (minority) role in Quobly's Series A (3 Jun 2026 release title). MOU date (mid-January 2026) per news, not read officially.
potential majority investment or acquisition (non-binding MOU, January 2026)
Published value
Not officially published
Segment
Quantum computers and processors: silicon spin-qubit quantum computing
Status
Abandoned (2026-02-20)
Sources:
SEALSQAcquirer release; First paragraph; read 2026-10-26
Method and sources
Completed acquisitions and majority-stake purchases involving quantum-technology companies, each read on its sources on the date given: releases of the acquirer or the target, regulatory filings (SEC EDGAR), stock exchange disclosures and official screening facts. Values appear only when the acquirer, the target or a filing published them, in the stated currency, never converted. Where no closing date is published, the date basis says whether the year comes from the release announcing the acquisition or from a period the source states. A few targets are not quantum companies but were bought by quantum companies; their segment is "adjacent technology". Organisations only; no person is named. Not exhaustive, no prediction or rating. Owner-reviewed for demonstration, 28 October 2026.
2018 to 26 October 2026. Priority: European targets (EU, EEA, United Kingdom, Switzerland), acquisitions by European companies and the main serial acquirers worldwide. Listings through mergers with listed shell companies (SPACs), minority investments and asset purchases out of administration are not acquisitions here and are listed under left out.
Verified means that an official source (a release of the acquirer or the target, a regulatory filing, a stock exchange notice or an official screening decision) was read and states the completion. Partly verified means that only the announcement or a news report could be read; the note says what is missing. A value is shown only when the acquirer, the target or a filing published it. Organisation pages are linked only when a portal organisation has the identical name.
14 deals looked for and left out, with the reason
Google - Atlantic Quantum (2025). Official Google blog (2 Oct 2025) says only that 'the Atlantic Quantum team is joining Google'; no acquisition, stake or closing stated in an official source.
IonQ - unnamed 'market intelligence business' (closed 9 Jun 2025, approx. USD 40.6m). Disclosed in IonQ 10-K Note 3 without naming the target; cannot attribute to a specific company.
Infleqtion - SiNoptiq, Inc. (Jan 2024). Infleqtion audited financials describe acquisition of a photonic patent license (asset acquisition), not of the company.
Quantum eMotion - SKV Technology (Apr 2026). Only an aggregator archive entry seen; no official source read; target country/activity unconfirmed.
Viewbix - Quantum X Labs (Mar 2026). Only aggregator mention; quantum-technology nature of target not established.
Bluefors - Rockgate (Japan, 2023). Target is a cryogenics distributor (not a quantum-technology company) and completion was not confirmed (release of 25 May 2023 only expected closing by end June 2023).
SEALSQ - Wecan Group majority stake (Jun 2026). Completed per SEALSQ release, but target is a KYC/compliance software company, not quantum technology.
M Squared Lasers (UK) assets - Novacene Photonics (Nov 2025). Administration sale of IP and certain assets reported only by news; no official source read; not a share acquisition.
SPAC business combinations: IQM - Real Asset Acquisition Corp; Pasqal - Bleichroeder Acquisition Corp. II; Infleqtion - Churchill Capital Corp X; Xanadu - Crane Harbor; Horizon Quantum - dMY Squared; SEEQC - Allegro Merger; Terra Quantum - Axiom Intelligence / Mountain Lake; EigenQ - Silicon Valley Acquisition Corp.. Public listings via SPAC (reverse mergers), not acquisitions of a quantum company by an operating acquirer; out of scope.
SEALSQ minority investments (EeroQ, Quobly Series A). Minority investments, not acquisitions or majority stakes.
Rigetti, Quantinuum, IQM, Alice & Bob, Quandela, Multiverse, Q-CTRL, Qblox, OQC, Riverlane as acquirers. Searched; no completed acquisition found 2018-2026 in sources checked.
D-Wave other acquisitions. Searched; none found other than Quantum Circuits.
Keysight - Labber Quantum (2019 or 2020). only a republished release read; the year and the target country are not stated consistently in the sources read.
Mandeville Ventures - Quantropi (announced April 2026). only a news-aggregator entry read; target outside Europe and acquirer not a quantum company.