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Antioch’s $32M Series A: Greylock Bets on Sim, Not a Billion-Dollar Data Collect
Greylock led a $32 million Series A for New York physical-AI simulator Antioch on September 8, 2026. Amazon’s Ring is named in the release. Valuation, ARR, and a company total that reconciles seed plus pre-seed were not disclosed.
Antioch closed a $32 million Series A on September 8, 2026. Greylock led. Saam Motamedi’s Greylock post and the company release agree on the lead and the amount. Valuation was not disclosed. Last verified September 9, 2026.
The product bet is that hardware-calibrated cloud simulation can replace some physical test hours. Forbes framed that against Figure’s real-world data spend. Figure’s budget is not Antioch’s metric. Antioch did not publish ARR.
Five-minute decision
| If you need… | Verdict |
|---|---|
| What happened | Funded. $32M Series A, Sep 8. Greylock led. |
| Who uses it | Named: Amazon’s Ring (release). Held-out-test quote from Ring CPO Jason Mitura. |
| Valuation / ARR | Not disclosed. |
| Prior capital | Seed $8.5M (Robotics 24/7). Pre-seed ~$4.24M (Robot Report). Do not sum as a company total. |
| Whether to diligence | Yes, if you underwrite sim-to-real for robotics. No, if you need a mark or a revenue print. |
Investigate further when: a named production customer plus a Greylock lead is enough to start a sim-to-real file.
Wait or pass when: you need paying-customer count, retention, or a post-money.
What closed
| Field | Detail |
|---|---|
| Company | Antioch; New York; founded 2025 (Robot Report / Nebius) |
| Round | $32M Series A · Sep 8, 2026 |
| Lead | Greylock (Saam Motamedi) |
| Participants | A*; Category Ventures; BoxGroup; Icehouse Ventures |
| Angels named | Shyam Sankar; Adrian Macneil; Ian Andrews (NVIDIA; former Groq) |
| Founders (Greylock) | Harry Mellsop, Alex Langshur, Michael Calvey (Transpose → Chainalysis); Collin Schlager (Meta Reality Labs). Mellsop: Tesla computer vision |
| Use of proceeds | Product, engineering hiring, deeper sim (company) |
No /fund/ pages for A*, Category Ventures, or Icehouse.
Sim vs real-world data
This site already covers collection (XDOF in $1.2 billion Series B talks; Human Archive) and holding-company physical AI (Atoms). Antioch sells simulation. NVIDIA Isaac Sim / Isaac Lab integration is a company partnership claim, not an acquisition.
The $50 trillion “physical economy” line in the release is a TAM slogan. Ignore it for underwriting.
What remains undisclosed
Paying customers besides Ring. Contract size. ARR. Valuation. A company-stated lifetime total that includes seed and pre-seed without double-counting A*’s two appearances.
Related: Antioch profile · Greylock · XDOF talks · Lyte silicon · September 9 index.
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Editorial note: AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.
