http://www.ft.com/cms/s/0/ee9f239e-8f50-11dd-946c-0000779fd18c.html By Jeremy Grant Published: October 1 2008 03:00 | Last updated: October 1 2008 03:00 NYSE Euronext yesterday said that JPMorgan would become the third investment bank to become a shareholder in its planned "dark pool" trading facility, dubbed SmartPool, writes Jeremy Grant . Dark pools are off-exchange venues where large orders can be traded anonymously without prices being posted to an exchange's public or "displayed" order book. SmartPool was set up some months ago by NYSE Euronext, BNP Paribas and HSBC and had said it was seeking further investors. Lee Cook, head of European cash equities at JPMorgan, said: "Current market trends towards smaller execution sizes on central order books, and increasing market fragmentation re-enforces the need for these venues as Europe's market structure continues to evolve." NYSE Euronext said SmartPool was set for a "soft launch" in November and would offer trading in all 14 European markets "to a large client base" before the end of the year. The development came as another dark pool, Nyfix Euro Millennium, appointed X-Clear, the Swiss clearing house, as its clearer. The arrangement would be offered in conjunction with BNP Paribas, which already works with Nyfix in offering post-trade services.