Sunday

Current leadership (2)

• Tony Zhao Co-Founder & CEOreported, not verified
• Cheng Chi Co-Founderreported, not verified

Founders (2)

• Tony Zhaocofounder
• Cheng Chicofounder

Safety record

No incidents on record for Sunday.

Only active incidents are counted. Retracted incidents are excluded from this summary but remain reachable at their canonical URLs.

Peer companies

• Unitree Robotics9 models
• AgiBot5 models
• Boston Dynamics5 models
• Fourier Intelligence4 models
• Tesla4 models
• 1X Technologies3 models

Financial state

Reporting basis

private_reported

Lifecycle stage

early

Counterparty risk class

moderate

Each numeric field carries its own basis marker. Aggregators report a number; this surface preserves the source class so verification depth travels with the value.

Funding rounds (2)

• Series B2026-03-12

  $165M(reported) · $1.1B post

• Seed2025-11-19

  $35M(reported)

  Investors: Benchmark, Conviction

Sources (1)

1. https://www.globenewswire.com/news-release/2026/3/12/3254877/0/en/sunday-raises-165m-to-launch-first-autonomous-robots-by-thanksgiving.html ↗

Common questions

What is Sunday?

Sunday is a Mountain View-based AI robotics startup building Memo, an autonomous wheeled humanoid home robot. Founded in 2023 by Stanford PhDs Tony Zhao and Cheng Chi, the company emerged from stealth in November 2025 with 5M in seed funding from Benchmark and Conviction, and subsequently raised a 65M Series B at a .15B valuation in March 2026. Memo is designed to learn household tasks autonomously using Sunday's ACT-1 foundation model, trained on zero robot data. A Founding Family Beta of 50 households is planned for late 2026.

Where is Sunday based?

Sunday is based in Mountain View, CA, USA.

When was Sunday founded?

Sunday was founded in 2023.

What does Sunday make?

Sunday has 1 robot model on the DEPLOY registry: Memo (Sunday builds physical robots).

Where does Sunday operate robots?

Sunday is a robot manufacturer and does not directly operate deployments on the DEPLOY registry. Its products are deployed by customer operators; see the company page for the verified deployment record.