Check out which companies are making headlines after the bell Monday:
Alcoa - The aluminum producer posted earnings of 7 cents a share on sales of $5.85 billion, edging past estimates for 6 cents a share on revenue of $5.83 billion. Shares rose in extended-hours trading.
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Intuitive Surgical - The medical-equipment maker said it expects to post second-quarter revenue of $575 million, falling short of current Wall Street expectations for $630 million. The company is expected to post full results on July 18. Shares tumbled sharply in extended-hours trading.
"While we are disappointed in our performance this quarter, particularly with respect to our capital sales in the U.S., overall procedure performance was solid in a difficult environment, we remain confident in the value that our products and services bring to patients, hospitals and the healthcare system," said CEO Gary Guthart, in the company's press release.
WD-40 - The maker of household spray that does everything from loosening locks to lubricating hinges posted earnings of 66 cents a share on revenue of $93 million, easily beating expectations for 56 cents a share on sales of $89 million. In addition, the company reaffirmed its full-year revenue guidance and raised its earnings outlook, sending shares higher in extended-hours trading.
Equifax - The consumer credit reporting agency acquired identity protection company TrustedID, but financial terms of the agreement were not immediately disclosed.
Piper Jaffray initiated coverage of Western Digital with an "overweight" rating and a $77 price target. Meanwhile, the brokerage initiated coverage of Seagate Technology with a "neutral" rating and a $45 target. However, shares were largely unchanged in extended-hours trading.
Home Properties - The apartment real estate investment trust announced a secondary offering of 3.5 million shares through BofA Merrill. Shares slipped in extended-hours trading.