Accelerators offer a small investment, a fixed program and a demonstration event in exchange for equity. Their return model explains almost everything about how they operate.
The return comes from a small number of companies
Returns in early-stage investing are distributed extremely unevenly. Most companies in a portfolio return little or nothing, and a small number produce nearly all the value.
An accelerator holding a modest percentage of each company therefore needs at least one participant to reach a very large outcome for the fund to work.
That arithmetic pushes toward larger cohorts, since more entries increase the chance of containing an extreme outcome.
Selection favors companies that can move fast
A program lasting a few months can only demonstrate progress in businesses whose cycle is short enough to show measurable change in that window.
Software and consumer products fit. Hardware, regulated healthcare and businesses with long enterprise sales cycles fit poorly, which is why they are less represented.
Teams are weighted heavily in selection because at the earliest stage there is little else to assess, and the program is a bet on people adapting.
The demonstration event is the product
Programs conclude with a presentation to assembled investors. That event compresses fundraising into a period when many investors are watching the same companies.
Competition among investors within a short window improves terms for founders, which is a substantial part of what the equity purchases.
It also creates pressure to present a narrative optimized for that room rather than one reflecting the state of the business.
Follow-on rights matter more than the initial stake
The initial investment is small. The valuable position is the right to invest further in companies that perform, at terms agreed in advance or on preferential access.
This is why programs with associated funds structure their agreements to preserve participation in later rounds.
For founders the corresponding question is what those rights oblige them to offer, since a signal that an accelerator declined to follow on is read by other investors.
Terms deserve the same scrutiny as any financing
Standardized documents are presented as founder-friendly and are usually simpler than a priced round, but they still create dilution and governance implications.
Provisions on information rights, pro rata participation, most-favored-nation clauses and what happens if the company does not raise afterward all vary between programs.
Because these are securities transactions with legal and tax consequences that vary by structure and state, the documents warrant review by counsel rather than acceptance as boilerplate.