The S&P 500 closed slightly lower on Monday. Investors, meanwhile, focused on some notable insider trading.

When insiders sell stock, it shows they are concerned about the company’s prospects or that they think the stock is overpriced. Either way, it signals an opportunity to go short on the stock. Insider selling should not be considered the sole indicator of an investment or trading decision. At best, it can persuade a sales decision.

Below is a look at some notable recent insider sales. For more information, see Benzinga insider trading Platform.

PulteGroup

• The trade: Pulte Group, Inc. PHM Ex. VP & CFO Robert Oshaughnessy a total of 115,102 shares sold at an average price of $66.90. The insider received around $7.7 million from the sale of those shares.
• What’s up: PulteGroup reported better-than-expected Q1 results and approved a $1 billion increase in buyback program.
• What PulteGroup does: PulteGroup Inc is one of the largest home builders in the United States, operating in 42 markets in 24 states.

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American Airlines

• The trade: American Airlines Group Inc. EEL SVP Corporate Controller Angela Owens sold a total of 21,984 shares at an average price of $13.79. The insider received approximately $303.16,000 from the sale of those shares.
• What’s up: American Airlines reported weak quarterly revenue.
• What American Airlines does: American Airlines is the world’s largest airline by passenger miles.

IMAX

• The trade: IMAX Corporation IMAX CEO Richard L Gelfond sold a total of 100,000 shares at an average price of $20.95. The insider received approximately $2.09 million from the sale of those shares.
• What’s up: Imax reported better than expected first quarter financial results.
• What IMAX does: Imax today is primarily a technology hardware and brand licensing company that does not operate the vast majority of Imax cinemas.