Why Nvidia, Broadcom and other high-flying stocks are especially risky now

Crash odds are elevated when an industry or sector outperforms the market significantly. - MarketWatch photo illustration/iStockphoto October doesn’t deserve its reputation as the month when stock-market crashes occur. Though the two worst crashes in U.S. history happened in that month — 1929 and 1987 — the risk of a marketwide crash is no greater in October than in any other month. Investors worried about a broad market crash in October can perhaps take a bigger sigh of relief. The same cannot be said o ...