Falling profits, dividend cuts and police or security commission investigations are some of the well-known signs of risk detailed in even the most basic stock market advice. But wise investors will also stay alert for more subtle signs of problems that may be threatening a company’s prosperity.

Look for these 3 hints that a company may soon be facing big trouble.

1. Strong reactions to outside criticism: When outsiders criticize a company’s accounting and the criticism is unjustified, most corporate insiders simply ignore it. But if insiders have something to hide, they may protest far too loudly—that is, threaten to sue critics of their accounting practices, in hopes of shutting them up.

   It’s generally a sound strategy to avoid companies that attract accounting criticism, but all the more so when insiders react with outrage and threaten lawsuits. You probably won’t miss much profit by staying out, but you’ll avoid some of the market’s worst disasters.

2. Too much focus on corporate prestige: When companies pay to name buildings after themselves (including gigantic sports venues), or build excessively costly head offices, it may mean they are pursuing prestige at the expense of profit.

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3. The middle-age-crazy syndrome: Many public companies are run by middle-aged males who reached their high-paid positions by working hard, marrying young and generally putting career ahead of their family and personal lives.

   In mid-life, all too many are overwhelmed by a desire to make up for all the fun they’ve missed. Some will go on to achieve a healthy balance in their lives, possibly following a divorce and remarriage. But others divorce themselves from business reality. They take on foolish business risks, at great cost to themselves and their shareholders.

   Hypothetical example: If the chief executive of, say, a steel plant, announces that the company is going into feature film production, you have to wonder if he has uncovered some great new secret of making money in films, or if he simply wants a socially acceptable way of meeting actresses.

Successful investors always remain alert for hints of troubles in their stocks. This allows them the chance to make a pre-emptive sell. By the time dividends and earnings disappear (or the police come knocking on the corporate door), it may be too late to get out without a big loss.

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