The U.S. Securities and Exchange Commission has turned down a controversial rule change that would have permitted Cboe International Markets to set a break up-second “speed bump” in the way of an ultrafast investing system recognised as “latency arbitrage.”

Cboe in June proposed delaying incoming executable orders on its EDGA exchange so marketplace makers would have 4 milliseconds to cancel or modify their orders in response to marketplace-going info.

The proposal sought to deal with concerns above latency arbitrage, a system applied by high-frequency traders to execute orders on a little bit out-of-date estimates.

But amid opposition from asset administrators and digital investing big Citadel Securities, the SEC issued an buy Friday obtaining the proposal was unfairly discriminatory and Cboe had not shown it was “sufficiently personalized to its stated purpose.”

“The Exchange has not shown why a four-millisecond delay is enough time to correctly safeguard a broad vary of marketplace members from the latency arbitrage problem,” the commission stated.

According to The Wall Street Journal, “the SEC has set the brakes — at least for now — on the proliferation of velocity bumps on U.S. stock exchanges” considering the fact that 2016, when the commission permitted startup IEX Group to turn out to be a comprehensive-fledged stock exchange.

“We are particularly upset that the SEC has disapproved our proposal to introduce Liquidity Supplier Defense,” Cboe stated in a statement, utilizing its time period for the proposed velocity bump.

Where IEX imposed a temporary delay on all orders to get or sell shares, Cboe’s delay would only have applied to orders that come to EDGA searching for to be quickly executed. Supporters of the CBOE proposal stated it would blunt the gain of high-frequency traders that use high priced technological know-how these as cross-place microwave networks to execute trades as quickly as feasible.

But the SEC stated Cboe had unsuccessful to clearly show that “liquidity takers use the most recent microwave connections and EDGA liquidity providers use regular fiber connections, and liquidity takers are capable to use the ensuing velocity differential to impact latency arbitrage on the Exchange.”

Asset manager BlackRock argued the proposal would “introduce unnecessary complexity and have a detrimental impact on U.S. equity markets.”

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Cboe International Markets, high frequency investing, IEX, latency arbitrage, velocity bump, U.S. Securities and Exchange Commission