Sept 21 (Reuters) - Payment systems provider ACI Worldwide Inc said it would repurchase most of the outstanding warrants held by IBM Corp.
ACI will buy back from IBM warrants for purchasing about 2.5 million ACI shares.
ACI had said last week that IBM will start exercising its 2.8 million warrants to take a stake in the company.
International Business Machines Corp, one of the largest computer hardware makers in the world, received the warrants in December 2007. The warrants allow it to buy up to 8 percent of ACI shares.
ACI shares closed at $43.08 on the Nasdaq on Friday.