Citadel has said: the SEC... ]can cause] potential for unintended consequences.

Citadel has said: We are deeply concerned that the SEC has simultaneously issued multiple far-reaching proposals that would dramatically overhaul current market structure without adequately assessing the cumulative impact on the market or the potential for unintended consequences.

The SEC “benefits from robust engagement from the public and will review all comments submitted during the open comment period,” the agency said in a statement. “Generally, we respond to comments received as part of the final rulemaking and not beforehand," it further said with the NSYE and Charles Schwab.

They recommended that the SEC set minimum quoting increments to a half-penny for some stocks and to harmonize trading increments for all symbols trading at or above $1 a share, per Bloomberg.

“We are concerned that the current best execution proposal, with overly prescriptive and impractical requirements for managing a new category of so-called ‘conflicted transactions’ may unnecessarily disrupt decades of market progress for investors,” they said.