TD Ameritrade Holding Corp. experienced an order routing and messaging issue on one of its trading platforms Friday morning that affected some clients' trade orders, the company said.

The issue was resolved at about 10 a.m. EDT, according to a TD Ameritrade spokeswoman.

The issue was related to an overnight software update, said the spokeswoman, and affected one of the company's many trading platforms. Some of the clients affected were retail trading customers.

The TD Ameritrade outage came two days after the New York Stock Exchange had a nearly four hour outage related to a software update on Wednesday.

NYSE, a unit of Intercontinental Exchange Inc., said Thursday that traders began having communications problems on Wednesday morning related to a software update made to one part of the system that matches buyers and sellers. When errors persisted, NYSE President Thomas Farley suspended trading.

No trades were canceled and there was no disruption to the actual trading, which carried on at other exchanges throughout the period, but the outage underscored the fragility of the systems that underpin the capital markets.

Write to Daniel Huang at dan.huang@wsj.com and Bradley Hope at bradley.hope@wsj.com

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