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Did you miss last night's "Mad Money" on CNBC? If so, here are Jim Cramer's top takeaways for today's trading.

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Acacia Communications (ACIA) : In his "Know Your IPO" segment, Cramer highlighted Acacia Communications, the optical networking company that came public on May 13 and has since rocketed up 160%.

Arcadia makes equipment that's integral to the Internet's infrastructure, Cramer explained, and the company is disrupting the market with new technology that's in high demand. Acacia posted 79% year-over-year revenue growth and is struggling to keep up with demand.

There are risks associated with Acacia, however, and Cramer noted the company has a high concentration of revenue in just a handful of customers. Nearly half the company is owned by just two shareholders.

Trading at 25 times earnings makes Acacia far too cheap given its growth rate, Cramer concluded, but only shareholders who are willing to accept the speculative risks should own it, and even then only on a pullback.

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KeyCorp (KEY) : In an exclusive interview, Cramer spoke with Beth Mooney, chairman and CEO of KeyCorp, the regional bank that's on the cusp of closing its merger with First Niagara Financial (FNFG) .

Mooney confirmed the merger with First Niagara will close on Aug. 1, increasing the size of KeyCorp by 40% and making the combined entity the 13th largest bank in the country. She said the merger is good for customers, shareholders and the communities they serve and will provide meaningful growth for the future.

When asked about her business, Mooney noted that KeyCorp saw 5.5% loan growth this quarter, driven largely by commercial lending. She said businesses are willing to expand their operations, but so far, investing in capital equipment remains weak.

Cramer said he's a big fan of the new KeyCorp and of the company's recent 13% dividend boost.

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Alkermes (ALKS) : For his second interview, Cramer sat down with Richard Pops, chairman and CEO of Alkermes, the biotech company that's up 75% from its February lows.

Pops said millions of people in America are addicted to opioids and Alkermes' drug, Vivitrol, blocks the receptors in the brain to break the physical addiction process. Vivitrol is a once-monthly treatment and is the only non-addictive option available.

Pops is also bullish on Aristada, Alkermes' treatment for schizophrenia, which is a long-lasting injectable that is perfect for those with disorganized thinking and often fail to take their medication.

When asked about the company's depression drug, which failed to meet clinical milestones earlier this year, Pops explained that treating depression is a difficult task and most drugs on the market failed initial clinical studies, just as Alkermes did. "We don't give up," Pops added and he continues to believe in the drug's prospects.

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At the time of publication, Cramer's Action Alerts PLUS had no position in stocks mentioned.