As of September 2026, Atom Computing is privately held and has not announced an IPO. It closed a $100M Series C in June 2026; a separate planned $100M U.S. Department of Commerce commitment is government support, not equity funding.
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.
Facts checked
Atom Computing remains a private company and has not announced an IPO, public ticker, or listing date.
The company closed a $100M Series C in June 2026. Its separate planned $100M U.S. Department of Commerce support was announced through a letter of intent and should not be counted as completed equity funding. Infleqtion (INFQ) and Microsoft (MSFT) provide the most direct listed exposure among the companies tracked here.
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 2026-09-05 · Sources: Atom Computing news ↗ · Atom Computing $300M+ Series C announcement ↗