Mario Schlosser, listed as an insider at Oscar Health, Inc. (OSCR), sold 600,000 shares on 2026-08-27 at an average price of $30.34 per share, for a total value of about $18.20 million. The filing indicates the transaction was not made under a pre-scheduled Rule 10b5-1 trading plan, which can make the timing more noteworthy because it was not automatically set in advance. Insider sales can matter to retail investors because they show when people close to the company are reducing exposure. That said, sales generally carry weaker “signal” than insider buys, since insiders sell for many routine reasons such as taxes, diversification, or liquidity needs. Schlosser’s designation as an “insider” rather than a top executive role also tends to reduce how much investors can infer from the trade, since senior leaders typically have broader visibility into operations and strategy. Over the past 30 days, this is the only OSCR insider transaction listed here, so there isn’t a documented recent cluster in this dataset. If other insiders (including the CEO) have also been selling, investors may want to verify those filings and look for details like whether sales were plan-based, how large they were relative to each insider’s holdings, and whether selling is widespread or concentrated among a few individuals.