Pre-IPO quantum computing company profile · Founded 2018 · Berkeley, California, USA
Company Facts
IPO Status
No IPO announced
Atom Computing shares are not available on public exchanges. See below for listed alternatives with similar technology.
Atom Computing builds neutral-atom quantum computers using optically trapped ytterbium atoms with nuclear-spin qubits. In October 2023 it became the first company to announce a quantum system exceeding 1,000 physical qubits (a 1,225-site array with 1,180 qubits) — beating IBM to the milestone by weeks.
Its most important commercial relationship is with Microsoft: the two demonstrated 24 entangled logical qubits on Atom hardware with Azure Quantum's qubit-virtualization stack in late 2024, and jointly sell a commercial logical-qubit machine through Azure. In May 2026 the U.S. Department of Commerce signed a letter of intent for $100M in planned funding to help Atom scale, and in June 2026 the company closed a $100M Series C led by Third Point Ventures — bringing total funding (equity plus the DoC commitment) to more than $300M.
| Round | Amount | Date | Key Investors | Valuation |
|---|---|---|---|---|
| Series C | $100M | Jun 2026 | Third Point Ventures (lead), DCVC, Cisco Investments and others | — |
| US DoC letter of intent | $100M (planned) | May 2026 | U.S. Department of Commerce | — |
| Series B | $60M | Jan 2022 | Third Point Ventures (lead), Prime Movers Lab | — |
| Prior equity rounds | ~$272M cumulative through Series B | 2018–2025 | Third Point, Prime Movers Lab, Venrock and others | — |
Infleqtion (INFQ) is the listed neutral-atom pure-play. Microsoft (MSFT) carries indirect exposure through the Azure Quantum logical-qubit partnership.
Related company roadmaps: Official IonQ quantum roadmap
Can you buy Atom Computing stock?
No. Atom Computing is private with no announced IPO. Infleqtion (INFQ) is the listed neutral-atom comparable, and Microsoft (MSFT) partners directly with Atom on logical qubits.
What was Atom Computing's 1,000-qubit milestone?
In October 2023 it announced a 1,225-site atomic array holding 1,180 qubits — the first quantum system past 1,000 physical qubits, announced weeks before IBM's Condor.
What is the Microsoft partnership?
Microsoft's Azure Quantum error-correction stack runs on Atom's neutral-atom hardware; the pair demonstrated 24 entangled logical qubits in 2024 and market a commercial logical-qubit system through Azure.
How much has Atom Computing raised?
More than $300M total, including a $100M Series C (June 2026, led by Third Point Ventures) and a $100M U.S. Department of Commerce letter of intent (May 2026) on top of roughly $272M in prior equity rounds.
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Static profile, updated manually · Last updated 2026-07-15 · Sources: Atom Computing news ↗ · Atom Computing $300M+ Series C announcement ↗