Exchanges will be commemorating the one-year anniversary of Sept. 11 today, which will affect the open of trading.

The

New York Stock Exchange

is scheduled to open a half-hour after the conclusion of the memorial services being held at the World Trade Center site. The service is expected to end at 10:29 a.m. EDT, and the NYSE will tentatively open at 11 a.m.

New York Gov. George Pataki, New York City Mayor Michael Bloomberg, former Mayor Rudolph Giuliani,

SEC

Chairman Harvey Pitt, and representatives of the NYC Department of Sanitation, Port Authority, the police and fire departments and EMS will ring the bell after a two-minute moment of silence and the Star Spangled Banner, sung by an NYPD officer. It will be Webcast on nyse.com after 10:45 a.m.

The

Nasdaq's

open will also be delayed until 11 a.m.

The

Chicago Mercantile Exchange

will coordinate the opening of its stock index products on Sept. 11 with the NYSE open. The CME will also observe minutes of silence on its trading floors at 8:46 a.m. and 10:29 a.m. ET. In addition, foreign exchange and interest rate markets will close one hour early.