Instavest launches out of the YC Winter 2015 batch:
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Investors can list their trades on Instavest, including the company, share amount and rationale behind the investment. Other users can invest alongside the people willing to share their own purchases and sales. If you follow a trade, Instavest encourages you to block out a portion of your profits — in the neighborhood of 5 percent — that might arise from the transaction for the original listing entity.
The idea arose when the company’s founders, Saleem Khatri and Zain Allarakhia, ran into a problem: Friends and family wanted to trade with them, but they lacked a tool to do so effectively."