Tsumobi went through Y Combinator in the Winter 2007 batch, describing itself as Messaging. Y Combinator's company directory lists it as Inactive. The directory does not say why a company stopped, and this page does not guess.
- Batch
- Winter 2007
- What they did
- Messaging.
- Industry
- Consumer
- Team size
- 2
- Based
- Boston, MA, USA; Cambridge, MA, USA
- Status
- Inactive, as listed by Y Combinator
Its batch
Winter 2007 had 13 companies in YC's listing: 2 Active, 6 Acquired, 0 Public and 5 Inactive, so Tsumobi is one of 5 companies from that batch listed as Inactive (38%). Across YC batches at least two years old, 23% of companies are listed Inactive.
Statuses are Y Combinator's own listing in its public company directory, read on the date shown. YC's directory can drop companies altogether, so the Inactive counts here are a floor, not a full count of companies that stopped. Acquired and Public are as YC lists them; neither says anything about the price or the outcome for founders.
The record: Tsumobi in the Y Combinator directory. Measured 2026-09-26 from Y Combinator's company directory.
YC Winter 2007All shut-down YC companiesYC outcomes
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