Every new California business filing, every dayProof School
Michael Mastick, Registered Agent
Guided Proof, Inc. appears to operate as Proof School, a private secondary school in San Francisco focused on mathematics. The school's website describes it as a maker culture for kids who love math. The LLC's registered address is a residential Graystone Terrace address, suggesting it may be a holding or administrative entity for the school.
Filed July 9, 2026 · San Francisco, CA · San Francisco County
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California Secretary of State (bizfile Online) · Entity B20260316283 · Retrieved July 14, 2026
About Proof School
Guided Proof, Inc. filed in California on July 9, 2026, as a private school based in San Francisco. Owner Michael Mastick filed personally as the registered agent. The domain was registered on May 31, 2013, 4,787 days before filing, through NameCheap. The company shares its owner name with one other entity. No annual report or EIN on file yet. We estimate revenue between $1 million and $10 million and 6 to 25 employees, operating from a physical location.
- Domain registered 4,787 days before filing, indicating a long-established web presence.
- Owner filed personally as registered agent.
- Owner name shared with one other entity.
- We estimate revenue of $1M-$10M and 6-25 employees.
- No annual report or EIN on file yet.
Compiled from the state record, the company's public web presence, and our own research; revenue, employee, and footprint figures are estimates, not verified financials. Updated August 24, 2026.
One of 499 new businesses registered in San Francisco in July 2026, and the only education business registered there that month.
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Filing Details
Verified Business Profile
Contact Information
Verified Website Profile
We matched this business to its website and pulled the domain's registration (WHOIS) record. Domain age is one of the strongest signals that a filing is a truly new business and not a re-filing or paperwork change.
Frequently Asked Questions
When was Proof School registered?
Proof School was registered as Corp on July 9, 2026 in California.
Where is Proof School located?
Proof School is based in San Francisco, CA, 94114, in San Francisco County.
What type of business is Proof School?
Proof School is classified as a education business (private school).
Does Proof School have an EIN on file?
No EIN was found on file for Proof School at the time of registration.
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