After-Hours Buzz: NUAN Soars After Carl Icahn Takes 9.27% Passive Stake ... HUM, NDAQ & More

Check out which companies are making headlines after the bell Monday:

Nuance Communications - Billionaire investor Carl Icahn took a 9.27 percent passive stake in the speech recognition software company, sending shares sharply higher in extended-hours trading.

Nasdaq - Nasdaq will acquire eSpeed from BGC Partners in a deal worth $750 million, which will allow the firm an entry point into the electronic fixed income business. BGC shares skyrocketed in extended-hours trading, while Nasdaq shares were largely unchanged after being temporarily halted.

(Read More: Stocks End Down After Weak ISM; AAPL Drops)

Medicare-focused insurance companies such as Humana and United Health rallied in extended-hours trading after the Centers for Medicare and Medicaid Services released a final estimated payment growth rate of 3.3 percent for insurers. In February, the government proposed a payment reduction of more than 2 percent.

Apple - The iPhone maker continued to edge lower in the after hours session after falling more than 3 percent in regular trading. CEO Tim Cook apologized on the company's Chinese website for confusion over its warranty policy following heavy criticism in the Chinese media of its after-sales service. Apple has finished down for the fourth-consecutive session, losing nearly 7 percent in that period.

Urban Outfitters - The clothing retailer said its comparable retail segment net sales are in the high single-digits so far in its first quarter, according to a 10K filing. Shares rose in extended-hours trading.

Shoe Carnival - The footwear retailer posted earnings of 16 cents a share, excluding one-time items, matching expectations. But revenue was lighter than expected at $206 million. Estimates called for $210 million. In addition, the company handed in disappointing current-quarter profit and sales guidance, sending shares lower in extended-hours trading.

TIBCO Software - The computer software company announced CFO Syndey Carey will leave the company. Current COO Murray Rode will act as the interim CFO until a permanent successor is named.

Nordic American - The international tanker company announced a $87 million secondary offering through Morgan Stanley. Shares slipped in extended-hours trading.

FICO - The credit score company acquired privately-held identity resolution software company Infoglide, but financial terms of the agreement were not immediately disclosed.

—By CNBC's JeeYeon Park (Follow JeeYeon on Twitter: @JeeYeonParkCNBC)

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