Avenzo Therapeutics

Athena Countouriotis MD, Principal

Avenzo Therapeutics is a clinical-stage oncology biotech company based in San Diego, California, developing next-generation therapies for patients. The company's website and third-party sources describe it as combining selective CDK2 and CDK4 inhibitors with bispecific antibody-drug conjugates, and it is pursuing a Nasdaq listing via a reverse merger with Rallybio Corporation. The LLC filing lists officers including Athena Countouriotis, Simeon George, and Patrick Machado, all of whom appear on the company's site.

Filed April 8, 2025 · San Diego, CA · San Diego County

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Source

California Secretary of State (bizfile Online) · Entity 3192969 · Retrieved July 26, 2026

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About Avenzo Therapeutics

Avenzo Therapeutics, Inc. filed in California on April 8, 2025, as a biotechnology company focused on oncology therapeutics. The filing lists eight principals, including Athena Countouriotis MD as Principal. Its domain was registered 990 days before filing, via GoDaddy. The modern website, built with All in One SEO, confirms the filing identity. No annual report or EIN on file yet. We estimate revenue between $10 million and $50 million and 26 to 100 employees, with a brick-and-mortar footprint.

Domain registered 990 days before the California filing date.
Eight principals listed, including multiple with medical and finance credentials.
Website is modern, built with All in One SEO, and confirmed to match the filing name and address.
No annual report or EIN on file yet.
We estimate revenue of $10M-$50M and 26-100 employees, with a brick-and-mortar footprint.
Principal location is San Diego, California.

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 23, 2026.

One of 3 new businesses registered in San Diego in April 2025, one of 2 biotechnology businesses.

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Filing Details

Entity NameAVENZO THERAPEUTICS, INC.

Entity TypeCorp

Entity Number3192969

Filing DateApril 8, 2025

Principal AddressLocked

City / State / ZipSan Diego, CA 92130

CountySan Diego

TimezonePacific (PT)

EIN on FileNo

WebsiteYes · domain registered 990 days before filing · registrar GoDaddy

Website BuildModern · All in One SEO (AIOSEO)

Annual ReportNot yet filed

Estimated Revenue$10M-$50M (estimate)

Estimated Employees26-100 (estimate)

FootprintBrick and mortar (estimate)

First Recorded by DayOneLeadJuly 26, 2026 (474 days after filing)

Verified Business Profile

SubcategoryOncology therapeutics

Contact Information

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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.

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