Steve Sosnick

The provided news articles focus on SpaceX's potential IPO and market reactions to Donald Trump's statements regarding Iran. Neither article mentions a person named Steve Sosnick. Therefore, it is impossible to provide a summary about him based on the given information. The articles discuss SpaceX's confidential filing for an IPO with the SEC, potentially the largest in history, and the volatile market response to Trump's changing stance on Iran, causing significant fluctuations in the Paris stock exchange. Without any information about Steve Sosnick, his relevance or significance in relation to these events cannot be determined.