According to a 13G filing, Visa (V) now owns 9.99% of Square (SQ). The move is interesting since Square trades back around the IPO price and similar growth stocks have taken huge hits in the last few months. The investment by VIsa would also seem to endorse the long term future of the mobile-payments provider. If the stock runs Friday on the news, my recommendation is to wait for a pullback after the excitement settles back down. Disclosure: No position