TD Ameritrade is lifting the trading commissions on 101 exchange-traded funds indefinitely. Investors must hold the ETFs for at least 30 days, however; otherwise they will be charged the standard $9.99 fee.

“We worked with independent experts [Morningstar] to create an objective list of ETFs focused on long-term investing,” said TD Ameritrade President and CEO Fred Tomczyk.

The funds are listed at TD Ameritrade’s new ETF Market Center, where investors can also find an ETF screener, data and Morningstar research and commentary.

Earlier this year, Charles Schwab, Fidelity and Vanguard also began free ETF trades, but only on 11 proprietary ETFs at Schwab, 25 Barclays iShares at Fidelity and 47 proprietary ETFs at Vanguard.

A limited number of trades on stocks and ETFs are free at other brokerages, but typically if a customer has an account of $25,000 or more, which is the case at Wells Fargo and Bank of America.

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