Is there currently any kind of report/index on early-stage tech startups? By early I mean pre-funding or angel-led, so everything pre-seed. What data/reporting do investors, accelerators, etc use to get access to these early-stage companies?
The closest I can think of is the Global Entrepreneurship Monitor (GEM).
Generally investors/accelerators do not "get access" because they don't care to go hunting. Those pre-seed companies directly share information. There's no need for investors to seek investees, nearly all traffic is inbound.