as a "private amateur" angel investor, i put ~$300K into 13 deals over a period of 4 years ('04-'84(, at a median size of around $20K. my largest investment wa

as a "private amateur" angel investor, i put ~$300K into 13 deals over a period of 4 years ('04-'84(, at a median size of around $20K. my largest investment was $100K; my smallest was $5K. most of them were at valuations south of $3M (in a few cases i did A rounds north of $5M pre, however in both cases i was working or consulting with the company). so far it looks like 3 of the 13 will do >5x, another 2-3 are likely going to return 0, and the other 5-6 are still tbd. i'm hopefuly i'll end up with 3-5 wins, and an aggregate return of 4-5x over a period of perhaps 7 years. as a "professional" angel investor now for a VC fund, i typically invest $50-$250K at valuations between $1-3M pre-money (however i'm new on the professional side; only done 4 deals since December). too early to say on either wins or returns, but i'm happy with the deals i've done so far. i think most private angel investors (in Silicon Valley) who dabble do deals at between $10K-25K. most professional angel investors in Silicon Valley who do it as their primary profession invest between $25K-250K per deal. your mileage may vary. some angels may do deals as high as $500K - $2M, however those are select cases. most times there are multiple angels syndicating.