Three Law Firms Dominate Disclosed Quantum Legal Work

Quantum computers rely on a complex stack of hardware, control electronics, and software. As these sophisticated machines transition from laboratories to the commercial market, a new legal framework has emerged around the companies developing them. This framework encompasses acquisitions, public listings, patent disputes, securities litigation, and government-backed deals.

Notably, three law firms handle nearly two-thirds of the publicly recorded legal work for nine leading quantum hardware companies. This statistic comes from Pirical, a London-based legal-technology and business-intelligence firm, via an August 28 press release.

Understanding Pirical’s Methodology

Specifically, Pirical’s analysis focused on publicly disclosed legal work for nine companies utilizing five distinct quantum computing approaches:

• Superconducting: Rigetti Computing and IQM
• Trapped Ions: IonQ and Quantinuum
• Neutral Atoms: Pasqal and Infleqtion
• Photonics: PsiQuantum and Xanadu
• Quantum Annealing: D-Wave Quantum

The “lawyer involvement” served as the unit of measurement. One lawyer working on one matter counts as a single involvement. Consequently, a deal involving nine lawyers results in nine involvements, reflecting the headcount on assignments.

Pirical acknowledges the limitations of this methodology. The data includes only publicly disclosed work and information extracted from law firm profiles, recorded up to August 2026. Firms that extensively publish lawyer and client information will naturally appear more prominently. This analysis doesn’t quantify revenue, nor does it represent the entirety of the global quantum legal market. Therefore, the observed concentration indicates disclosed activity, not a ranking of billings.

Early Leadership by Three Firms

Paul, Weiss, Osler, Hoskin & Harcourt, and Cooley collectively accounted for 77 of the 119 lawyer involvements identified by Pirical, which represents approximately 65% of the total. This concentration is largely attributed to a few key client relationships.

Paul, Weiss led with 29 involvements, 25 of which were connected to IonQ and four to D-Wave. IonQ’s expansion drove much of this work, covering mergers and acquisitions, intellectual property, tax, competition, and capital markets. The company’s activities included the acquisition of trapped-ion firm Oxford Ionics and semiconductor foundry SkyWater Technology, alongside deals involving Capella Space, Skyloom Global, Vector Atomic, and Seed Innovations. Paul, Weiss also advised on IonQ’s follow-on stock offerings and its investment in quantum cryptography firm ID Quantique.

Osler, Hoskin & Harcourt followed with 26 involvements, all tied to Xanadu. A significant portion stemmed from the Canadian company’s merger with a special-purpose acquisition company. This single transaction engaged a 25-lawyer Osler team across four Canadian cities and 13 practice areas, including tax, real estate, employment, executive compensation, and IP litigation, illustrating why involvement counts often exceed matter counts.

Cooley secured third place with 22 involvements: 13 linked to Infleqtion, eight to IonQ, and one to Rigetti. The Infleqtion work ranged from the company’s $100 million Series C financing to its agreement to merge with Churchill Capital Corp X and go public. For IonQ, Cooley provided defense in a securities-fraud case concerning disclosures related to its earlier SPAC deal.

The remaining involvements were distributed among 19 other firms, with none exceeding six. Davis Polk had six, Orrick five, and both Avance Attorneys and White & Case four each.

Evolution of Legal Work Beyond Early Financing

Pirical’s data categorizes quantum legal work, revealing its diversification as companies mature. Mergers and acquisitions formed the largest category with 43 involvements. Capital markets, venture financing, tax, intellectual property, and litigation also featured prominently.

Patent disputes were an early indicator of the commercial stakes involved in the field. Pirical cited IBM’s unsuccessful 2020 challenge to Rigetti’s patents, where Pillsbury Winthrop Shaw Pittman represented Rigetti. Securities cases emerged later, following a wave of quantum companies going public via SPAC mergers. These lawsuits scrutinize whether companies provided adequate disclosures to investors regarding their technology and prospects.

Capital markets work also saw an increase. Davis Polk was associated with Quantinuum’s public listing, Orrick with Pasqal’s merger with Bleichroeder Acquisition Corp. II, and Avance advised IQM on its €275 million Series B funding round.

Some assignments have transcended traditional technology deals. Herbert Smith Freehills Kramer advised PsiQuantum on its agreement with the Australian and Queensland governments to establish a large-scale quantum facility near Brisbane Airport, supported by an announced A$940 million package of equity, grants, and loans. Crowell & Moring assisted Quantinuum in its joint venture with Qatar-based Al Rabban Capital, which anticipates up to $1 billion in Qatari investment over ten years.

A Large but Uneven Pool of Expertise

Pirical conducted a secondary search for law firm partners with documented quantum experience, regardless of their work for the nine hardware companies. This search identified 374 partners across 163 firms, after removing 63 false positives (e.g., lawyers whose profiles mentioned academic quantum physics or quantum-dot display patents).

Eleven firms accounted for 113 of these qualified partners. Osler led with 16, followed by Paul, Weiss and Wilson Sonsini with 14 each, Jones Day with 13, Freshfields with 11, and Weil with 10.

Not all this experience originated from representing quantum companies directly. Some firms built their credentials by advising investors, buyers, or SPAC sponsors. Pirical noted eight Kirkland & Ellis partners tied to the Illinois Quantum and Microelectronics Park in Chicago, with PsiQuantum as an anchor tenant. Willkie Farr & Gallagher represented the SPAC side of Infleqtion’s public-market deal. This type of work could lead to future company-side mandates.

Key Takeaway

The primary insight here pertains to the industry’s maturation and not solely the law firms. Quantum companies are now generating legal work spanning patent filings and seed funding to billion-dollar transactions, shareholder litigation, and government-negotiated agreements. This wide spectrum confirms the substantial and growing commercial layer within the quantum sector.

Though the observed concentration is a significant indicator, it’s essential to consider the methodology. It reflects disclosed activity through August 2026 and will likely evolve as more firms enter the market and new deals close. For those tracking the business side of the quantum industry, monitoring who advises the next wave of public listings and government projects will likely reveal the dominant legal trends for the coming decade.