Stock Buybacks

Ambac Financial Group (NYSE: ABK) announced that its Board has authorized up to $50 million for share repurchases of its common stock. The repurchase of shares under the Stock Repurchase Program is conditioned up the completion of the offering of shares by the underwriters of its March 2008 offering. We are unable to predict when the offering will be completed.

Ambac President and Chief Executive Officer, Michael Callen, stated, "The Board of Directors of Ambac believes that share buyback, when permitted under regulatory rules and corporate policy, represents a good investment of our capital and reinforces our confidence in the long-term stability of our company."

Ambac Financial Group is a holding company whose affiliates provide financial guarantees and financial services to clients in both the public and private sectors around the world.

O.I. Corporation (NASDAQ: OICO) announced that it repurchased 55,505 shares, or approximately 2%, of OI common stock in a private transaction.

The shares were repurchased at the market price of $11.28 per share as reported by the Nasdaq Global Market on July 1, 2008, the date of the transaction. The purchase was effected under the Company's ongoing stock repurchase program which permits purchases in the open market and through privately negotiated transactions.

O.I. Corporation (O.I) provides products for detection, analysis, measurement and monitoring applications in a variety of industries, including environmental testing, food and flavors, beverage, pharmaceutical, semiconductor, power generation, chemical, petrochemical and security. [SM]

Copart (Nasdaq: CPRT) entered into an agreement with Willis J. Johnson, the CEO and a member of our board of directors, pursuant to which it will acquire 1,500,000 shares of our common stock at a price of $40.00 per share, or an aggregate purchase price of $60,000,000. The settlement date for the acquisition of the common stock is expected to be on or about July 11, 2008, and the purchase will be made pursuant to our existing stock repurchase program. The per share purchase price for the common stock to be acquired is based on the closing price of our common stock on July 1, 2008 (as reported by The NASDAQ Stock Market), less 5.5% or $2.35.

Fiserv, Inc. (NASDAQ: FISV) announced it has signed a definitive agreement with Trident IV, a private equity fund managed by Stone Point Capital LLC, in which Trident will invest approximately $205 million in equity and $335 million in debt to acquire a 51% majority interest in Fiserv's insurance businesses.

In connection with the sale, Fiserv also affirmed its 2008 adjusted earnings per share guidance range of $3.28 to $3.40 from continuing operations. Fiserv expects the transaction to be accretive to its long-term revenue, earnings and margin growth rates.

In a related action, the Fiserv Board of Directors authorized the repurchase of up to an additional 10 million shares of Fiserv common stock.

IndyMac Bancorp (NYSE: IMB) today announced that, effective June 30, A. Scott Keys, the company's former CFO, has resigned. Mr. Keys had been on a medical leave of absence since April 24, 2008.

Unrelated, Indymac's Chairman and CEO, Michael Perry, responded to recent shareholder suggestions about a stock buyback. The exec said that while he had thought about the issue, Indymac is not considering a buyback of its shares.

IndyMac Bancorp, Inc. operates as the holding company for IndyMac Bank, F.S.B., a thrift/mortgage bank that provides mortgage products and services in the United States.