Founder sues YC over idea in rejected 2018 application
Harmony Oswald says YC used her rejected 2018 Founderology application to build Co-Founder Matching. Her latest complaint says no code had been developed, while the application names rival services. Four claims have survived dismissal.
By Ryan Merket · Published · Updated
Primary source: Y Combinator
Why it matters
Accelerators routinely collect detailed applications from founders without signing nondisclosure agreements. This case tests whether an application and an alleged oral confidentiality understanding can create liability when an investor later builds a related product. Four claims have survived demurrers, but those rulings establish no copying by YC.
Harmony Oswald applied to Y Combinator with a startup called Founderology on March 24th, 2018. Twenty-five days later, YC told her the company was “not selected to interview.”
Three years later, YC launched Co-Founder Matching, a free service that recommends potential startup partners. Oswald discovered the product in August 2024 and sued Y Combinator Management and several affiliated funds the following May, alleging that YC used her application to build it.
On paper, Oswald’s suspicion makes sense. She pitched YC, YC rejected her, and YC later built something that sounds a lot like the headline of her application. Her lawsuit depends on what happened inside YC during the three years in between. So far, the public record contains no email, access log, product document or witness account showing that her application reached the people who built Co-Founder Matching.
Oswald’s application acknowledged that co-founder matching services already existed. Her latest complaint says she had developed no code. Her contemporaneous handwritten notes do not record several promises that became central to her lawsuit. YC’s public product description also omits the investor-data method Oswald identifies as her trade secret.
The case has still made it through three amended complaints and several attempts to dismiss it. Oswald, a California attorney representing herself, said in April that four claims will proceed: trade-secret misappropriation, breach of implied contract, negligence and unfair competition.
No court has found that YC copied Founderology. The case remains at the pleading stage.
The plaintiff is a creditor-side collections lawyer
Oswald is familiar with litigation. She has been an active California attorney since December 2016, and her State Bar profile lists banking, bankruptcy, business, commercial law and litigation as self-reported practice areas.
Her public docket trail is concentrated in creditor collections and commercial-finance enforcement. Court indexes list Oswald on filings for Citibank, Capital One, JPMorgan Chase and Portfolio Recovery Associates in numerous limited civil collection matters. A January 2022 Contra Costa County docket report identified her as plaintiff-side counsel in four bank collection complaints appearing on the same day’s calendar. More recent matters include Ameris Bank v. OWC LLC, filed in Santa Clara County in 2024, and Channel Partners Capital, LLC v. Shane Weber, a Los Angeles County commercial-finance dispute filed in 2023.