new enterprise associates reaped a 15fold gain on its investment in robinhood markets inc  a return that would have been even higher if not for an emergency funding round earlier this year the venture capital firm revealed that it paid 231 million for its 103 stake in robinhood according to a regulatory filing that same stake amounting to 748 million shares was worth about 35 billion as of the close of trading on friday  robinhood has been at the center of the memestock frenzy that’s captivated wall street this year but after wild trading sent its collateral requirements soaring the company was forced in january to draw down its credit lines and raise 34 billion from backers  including nea  to post more collateral with the industry’s clearinghouse