The list of Wall Street investors in the

International Securities Exchange

( ISE) just got a little longer.

The New York-based options exchange said Monday that

E*Trade Financial

(ET) - Get Report

,

Nomura Securities

and

Van de Moolen

( VDM) each have taken an equity stake in the company's newly planned stock exchange. ISE did not disclose how big a stake each of the financial firms will have in the new exchange.

Earlier this year, the ISE announced plans to launch a new stock exchange called ICE Stock Exchange. At that time, ISE said

Bear Stearns

( BSC),

JP Morgan Chase

(JPM) - Get Report

,

Knight Capital

(NITE)

and

Deutsche Bank

(DB) - Get Report

were all joining as equity investors in the new venture.

ISE went public a little over a year ago. The company's new electronic stock exchange is expected to open for business later this year.

In early trading, shares of ISE were down 2 cents to $38.44.