Some of TD Ameritrade Holding Corp.'s (AMTD) clients are unable to access the online brokerage's website Monday, a company spokeswoman confirmed.

The spokeswoman said the service disruption is affecting a "very small number of clients" and is related to a "connection issue with a certain Internet service provider." She declined to comment on the name of the vendor, citing company policy.

TD Ameritrade is rerouting web traffic where it can, but says some customers may still be experiencing service issues.

"We're working directly with the ISP to resolve [the issue] as quickly as possible," she said.

The connection issue is the second such disruption for the Omaha, Neb., company in the past three weeks. On May 20, some clients were unable to log into their accounts with the company for over an hour. That issue didn't affect TD Ameritrade's institutional--or, independent registered investment adviser--clients, who access the site through a different Web platform.

TD Ameritrade, along with peers Charles Schwab Corp. (SCHW) and E*Trade Financial Corp. (ETFCD), experienced a surge in trading volumes on May 6 during the "flash crash" stock market plunge. Schwab and privately held Fidelity Investments also experienced "slowness" that day in their website displays to clients.

Shares of TD Ameritrade recently traded down 18 cents, or 1%, at $17.57.

-By Brett Philbin, Dow Jones Newswires; 212-416-2173; brett.philbin@dowjones.com
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