* NYSE Euronext offered $1.675 per share in cash
* Offered price is premium of 95 pct vs previous close

NEW YORK - NYSE Euronext (NYX.N) said on Thursday the trans-Atlantic stock exchange will acquire NYFIX Inc (NYFX.O) in a deal valued at $144 million, to optimize trading efficiency.

NYSE Euronext offered $1.675 per share of common stock, a 95 percent premium over Wednesday's closing price of NYFIX on the Nasdaq.

The acquisition will be done through NYSE Technologies, an indirect, wholly owned subsidiary of NYSE Euronext.

The boards of NYSE Euronext, NYSE Technologies and NYFIX have approved the acquisition, which is also subject to approval by NYFIX shareholders and regulators.

The transaction is expected to close in the fourth quarter of 2009 and be accretive to NYSE Euronext 2010 earnings, excluding one-time deal and restructuring costs.

NYFIX designs systems that process financial transactions and offers broker-dealer services. Brokers, banks and exchanges use its systems to buy and sell stocks and derivatives, obtain real-time quotes, and manage trade orders. (Reporting by Juan Lagorio, editing by Maureen Bavdek)

NYSE Euronext New york city