US software firm Sungard Data has seen its shares surge by 25% after saying it is in takeover talks.
Press reports have speculated that any buyer would have to pay close to $10bn (£5.3bn) for control of the firm.
Sungard's software is used to trade shares and process deals, and it handles most of the transactions on the key technology-dominated Nasdaq index.
Shares of Sungard, which serves most of Wall Street's largest firms, jumped $6.12 to $31.07 on Monday in New York.
Suitors?
Should a deal go ahead, then it is likely to be the biggest buyout for 15 years.
A number of investment firms, including San-Francisco-based Silver Lake Partners have been linked to Sungard.
Texas Pacific Group, Thomas H Lee Partners, Blackstone Group, and Kohlberg Kravis and Partners also have been mentioned as potential suitors.
Neither Sungard nor the investment firms would comment on who possible suitors might be.
Sungard had sales of nearly $3.6bn last year, generating net income of $454m.
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