Atkins is expected to focus on reducing regulations and levying lower penalties for violations.
Dan Gallagher says he's committed to Robinhood.
His ambitious agenda drew fierce resistance from Wall Street.
The novelty of private-credit ETFs and liquidity issues have alarmed investor advocates.
The rules will allow thousands of stocks and ETFs traded on exchanges to be quoted in half-penny increments.
The rules required private fund managers to give investors more details about quarterly fees and expenses.
The senator called the decline part of a "deliberate deregulatory effort."
Critics said the proposal would have put heavy burdens on investors saving for retirement.
The SEC has signed off on funds tied to the second-biggest cryptocurrency.
BF Borgers CPA PC will pay $14 million to settle the probe, the agency said.