Rambus

(RMBS) - Get Report

was gaining nearly 5% after its board approved an increase in its buyback, giving the company the ability to repurchase up to 5 million additional shares.

The company, which develops and licenses out computer-memory chip technology, already has the authority to buy back 1.6 million shares. Rambus was lately up $1.61 to $35.65.

Shares of

CheckFree

( CKFR) were lower a day ahead of its second-quarter earnings release. The provider of electronic-commerce services is scheduled to post its results after the close of trading Tuesday.

Analysts expect CheckFree to show earnings of 41 cents a share on revenue of $212.3 million for the quarter. The stock was recently losing $1.18, or 2.7%, to $43.08.

Emdeon

(HLTH)

, the former WebMD, saw its shares move higher after the company said it could use up to $48 million to buy back common stock. The repurchases will take place from time to time in the open market, through block trades or in private transactions. Recently, shares of Emdeon were gaining 21 cents, or 2.3%, to $9.18.

Tekelec

( TKLC) was climbing after the company said it named Frank Plastina as chief executive and president. He will also join the board.

Plastina, who spent much of his career at

Nortel

( NT), will start at Tekelec on Feb. 6. Shares of Tekelec, a provider of signaling and switching telecommunications products, were up 22 cents, or 1.5%, to $14.88.

Shares of

Philips Electronics

(PHG) - Get Report

were jumping after the company posted its latest financial results. The Dutch electronics giant earned 332 million euros in the fourth quarter, down from 498 million euros a year ago, but the latest quarter includes charges of 458 million euros related to its LG.Philips Displays joint venture.

Fourth-quarter sales increased 6% from a year ago to 9.52 billion euros. Philips' shares were gaining $1.29, or 4.2%, to $31.87.

Internet marketing company

CGI Holding

(THK)

was rising after it completed a $17.5 million credit facility with Wachovia Bank. The company, which does business as Think Partnership, said the credit line consists of a $15 million revolving loan and a $2.5 million term loan. Shares of CGI were gaining 9 cents, or 4.1%, to $2.30.