Cravath, Swaine & Moore is advising longtime client IBM on a pair of acquisitions that continue a strategy by the computer giant to expand its portfolio of analytics software products.

In deals announced Wednesday and Thursday, IBM will acquire i2, a U.K.–based data security company, from private equity firm Silver Lake Partners, and Algorithmics, a risk analytics company based in Toronto.

IBM is paying $387 million to acquire Algorithmics from Paris-based holding company Fimalac. Financial terms of the i2 deal were not disclosed.

Cravath corporate partner George Schoen, tax partner Andrew Needham, and employee benefits partner Jennifer Conway are advising IBM on both deals. IBM's general counsel is Robert Weber.

Cravath has been busy in recent years advising IBM on its acquisition of data analysis software companies. The firm handled IBM's $1.2 billion acquisition of SPSS in 2009 and $1.7 billion purchase of data analytics company Netezza in 2010. The company has spent $14 billion to expand its portfolio of these products in the last five years, according to The New York Times.

IBM's client history with Cravath goes back to a long-running antitrust investigation by the U.S. Department of Justice that extended from 1969 to 1982.

Cambridge, England–based i2 specializes in making analytical software used by police in the U.K. and abroad, as well as branches of the military and companies like Vodafone and KPMG. A spokesman for i2 declined to disclose the company's legal advisers on its sale to IBM, which is expected to close in the fourth quarter of this year. Karen King serves as managing director and chief legal officer for Menlo, Calif.-based parent Silver Lake.

Fimalac acquired Algorithmics through its Fitch Group unit for $175 million in 2005. Algorithmics provides financial risk management software to banks, brokerages, insurance companies, and other corporate clients. An Algorithmics spokesman did not immediately respond to a request for comment on its legal advisers for the sale to IBM. The company's general counsel is Michael Spragge.