High-fidelity, cloud-scale simulation for physical AI: calibrated digital twins to develop, test and validate robots, drones and autonomous systems before real-world deployment
Antioch builds a simulation platform for physical AI. Robotics and autonomy teams create digital twins calibrated to their own hardware, compose realistic scenes and sensor models, and run thousands of scenarios in parallel in the cloud to develop, test and validate their systems before real-world deployment, closing the sim-to-real gap that has kept most of the industry testing on physical rigs. Its Antioch Agent can onboard a robot from CAD and spec sheets and iterate on the autonomy stack, and the platform integrates NVIDIA Isaac Sim, Isaac Lab and Omniverse. Customers include Amazon's Ring, whose chief product officer said Antioch's simulations matched physical test results even in scenarios held out of calibration, and Launchpad Build AI. Founded in New York in May 2025 by Harry Mellsop (CEO, ex-Tesla Autopilot), Alex Langshur and Michael Calvey (who with Mellsop built Transpose, sold to Chainalysis), Collin Schlager (Meta Reality Labs) and Colton Swingle (Google DeepMind), it raised a $4.25M pre-seed in December 2025, an $8.5M seed at a $60M valuation in April 2026, and a $32M Series A led by Greylock in September 2026.
AI📍 New York, NYFounded 2025
Current Valuation
$60M
as of 2026-04-16
PRIVATE
QL Price
$60M
0% vs last round
QuantLogix's current estimate for Antioch, published 2026-10-11 — in line with the last disclosed round of $60M (2026-04-16).
Confidence
low
Basis
round anchored
What backs this price
Last disclosed round
$60M
2026-04-16
weight 0.71
How this price has held up
No round has priced for Antioch since QuantLogix began publishing a price for it, so there is nothing to grade yet. The claim above is on the record from 2026-10-11 and will be graded against the next priced round. See the full accuracy record →
Which publicly-traded funds already hold it, what $10,000 buys, and whether any route is open to you.
Cite this price as QuantLogix QL Price, Antioch, 2026-10-11 (83262b01a8e02121).
The id pins this exact claim, so a citation stays checkable after the price moves.
Model estimate for research — not a quote, target price, or investment advice.
IPO Outlookprivate
Is Antioch going public?
No. Antioch is private and has not filed to go public. There is no S-1 on file.
What is Antioch's valuation in 2026?
Antioch is valued at $60M as of 04/16/2026, set by its Series A ($32M, Sep 2026). That is the last confirmed mark, not a live price — private shares do not trade continuously.
Has Antioch filed an S-1?
No public S-1 is on file for Antioch.
Who are Antioch's investors?
Antioch's investors include Greylock, A*, Category Ventures, Box Group, Icehouse Ventures, MaC Venture Capital and 4 more.
How much has Antioch raised?
Antioch has raised $44.75M in total across 3 disclosed rounds, most recently a Series A of $32M in Sep 2026.
Is Antioch publicly traded — can you buy Antioch stock?
No. Antioch is a private company — its shares are not listed on any exchange and there is no ticker. The routes to exposure are pre-IPO secondary marketplaces and funds (accredited investors), employee tender offers when the company runs one, and public companies with read-through exposure. QuantLogix maps every route it can verify for Antioch on its Pre-IPO Access Desk.
Answers are derived from the roster record shown on this page — filing status, last round and confirmed marks. Where the record is silent, the answer says so rather than guessing.
Company Profile
CEO
Harry Mellsop
Founded
2025
HQ
New York, NY
Total Raised
$44.75M
Last Round
Series A — $32M (Sep 2026) · Lead: Greylock
IPO Status
private
Fundraising Status
Series A · $32M · 1 mo ago
privateTotal raised $44.75M3 disclosed rounds
Growth & Valuation
Capital raised per round
Charts built from publicly disclosed funding rounds and revenue estimates. Approximate, not real-time, not investment advice.
Funding History
Round
Amount
Date
Lead Investor
Post-Money
Series A
$32M
Sep 2026
Greylock
—
Seed
$8.5M
Apr 2026
A* and Category Ventures
—
Pre-Seed
$4.25M
Dec 2025
A*
—
Vertical Intelligence — Defense / Aerospace
No name-verified federal prime awards for Antioch in the last 36 months on USASpending.gov — revenue may be classified, flow through subcontracts, or be non-US. Absence of a registry match is reported as-is.
Checked usaspending.gov as of 2026-10-06. Re-checked weekly.
Talent Signal
Hiring trend
● First snapshot
trend accrues with monthly sweeps
Open roles
5
via ashby
Product-build share
0%
engineering, research, product, design
Trajectory
steady
go-to-market push — Only 0% of open roles build product — hiring is concentrated in sales/marketing/ops (5 of 5 open roles are other).
Actively hiring with no tracked executive churn.
Open roles by month
Open roles by function
■ product-building ■ go-to-market / G&A
Member of Technical Staff, SimulationMember of Technical Staff, Core PlatformMember of Technical Staff, Customer DeploymentsProduct MarketerMember of Operational Staff
Counted from Antioch's live job board as of 2026-09-14; role functions classified from posting titles. Open-role counts are an activity signal, not headcount. Refreshed monthly.
Founders & Key People
Harry MellsopAlex LangshurMichael CalveyCollin SchlagerColton Swingle
Investors
Greylock · A* · Category Ventures · Box Group · Icehouse Ventures · MaC Venture Capital · Abstract Ventures · Shyam Sankar · Adrian Macneil · Ian Andrews
Products
Antioch simulation platform - precision-calibrated digital twins of a customer's own hardware, with scenarios dispatched as thousands of parallel cloud runs and wired into CI/CD for release test coverage
Module library - 2.5k+ off-the-shelf robot, sensor (lidar, RGB-D, radar, IMU) and scene assets, multiple physics solvers (PhysX, Newton/VBD, MPM), Gaussian-splat and world-model scenes, and automatic twin calibration from real telemetry
Antioch Agent - onboards a system from CAD, BIM and spec sheets, then controls the simulation, designs scenarios and iterates on the autonomy stack
Synthetic data generation for rare or dangerous failure cases, across aerial, ground and industrial autonomy and intelligent (fixed) perception
NVIDIA Isaac Sim / Isaac Lab and Omniverse integration, authored locally without a GPU and run on cloud infrastructure including Nebius
Physical AISimulationRoboticsDigital TwinsAutonomySynthetic DataDronesAI AgentsSeries A
Private-company numbers are not real-time. Reflects publicly disclosed valuations from press releases, news reports, and tender offers as of 2026-04-16. Refreshed quarterly.