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Vol. III·Sector Directory·Companies
41 names · listed & material private
Boulder · Colorado
updated continuously

The quantum cohort

A screener for the quantum economy — every public ticker and material private actor, ranked by the Ledger Score and read against the same set of editorial questions.

The most useful screener for a pre-revenue sector is the one that lets you sort by conviction, not market cap.

— the editorial premise of this directory

The cohort below is the universe the Ledger watches every weekday. It is curated, not exhaustive: each name is here because it is either publicly listed, materially funded, or carrying a technical claim other operators take seriously. The Ledger Score is a composite — capital, technical milestones, sentiment, policy, talent, patents — and is not a recommendation. Treat the rankings as a starting point, the per-company profile as the actual argument.

Filter by ownership=private, modality=spin, or change the sort order=score. The directory state lives in the URL — copy the address bar and you've shared the screen.

Most active · today's session

Where the cohort is moving

INFQ-11.0%

Most-diversified quantum portfolio — neutral atom computer + atomic clocks + sensors; only US-listed neutral-atom pure-play.

Neutral atomBoulder, CO, USA
QUBT-10.4%

A $1.4B cash hoard from peak-retail ATM raises looking for a thesis — photonic chip foundry + post-quantum crypto via NuCrypt.

PhotonicHoboken, NJ, USA
IONQ-9.6%

The only public quantum pure-play crossing $100M revenue; vertically integrating via the $1.8B SkyWater acquisition.

Trapped ionCollege Park, MD, USA

The screener · 5 of 41 match

Ranked by Ledger conviction

Ownership
AllListedPrivate
Modality
All modalitiesSuperconductingTrapped ionNeutral atomPhotonicSilicon spinAnnealingTopologicalSoftware & QEC
Sort
Ledger ScoreMarket capΔ sessionA–Z
  1. 01
    Quantum MotionPRIVATEPrivate

    Full-stack silicon CMOS spin qubits manufactured in standard foundries — closest path to leveraging $500B semiconductor capex.

    Silicon spin

    London, UK

    n/a
    n/a
    61/100
  2. 02
    Photonic Inc.PRIVATEPrivate

    Silicon T-centre spin-photon interface for distributed quantum — the most architecturally novel QBI Stage B bet, Microsoft-backed.

    Silicon spin

    Vancouver, BC, Canada

    n/a
    n/a
    60/100
  3. 03
    DiraqPRIVATEPrivate

    Silicon-spin frontrunner — industrial-CMOS-compatible qubits at >99% two-qubit fidelity; the manufacturing-thesis dark horse.

    Silicon spin

    Sydney, Australia

    n/a
    n/a
    52/100
  4. 04
    Silicon Quantum ComputingPRIVATEPrivate

    Atom-by-atom precision-placed donor qubits in silicon via STM lithography — Michelle Simmons team, 20-year head start on the modality.

    Silicon spin

    Sydney, Australia

    n/a
    n/a
    47/100
  5. 05
    QuoblyPRIVATEPrivate

    CEA-Leti silicon spin-qubit spinout — French sovereign bet on FD-SOI 300mm manufacturing scale.

    Silicon spin

    Grenoble, France

    n/a
    n/a
    40/100

A cohort is not an index. We omit names that publish only aspirational roadmaps; we include names with no revenue if a sovereign technical buyer has audited the science.

— directory methodology

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