The Securities and Exchange Commission is reconsidering its initial approval of the first-of-its-kind, quadruple-leveraged exchange traded funds designed to provide four times the daily price moves of the S&P 500.

The commission has decided to put on hold and doesn’t allow for the previously proposed ForceShares Daily 4X US Market Futures Long Fund, under the ticker UP, and ForceShares Daily 4X US Market Futures Short Fund, under the ticker DOWN, to begin trading, the Wall Street Journal reports.

The SEC originally approved both the UP and DOWN 4x ETFs, stating that the funds met regulator’s requirements and were approved for listing.

The green-light for the 4x funds came at a difficult juncture for sponsors of more exotic derivatives-based ETFs. The SEC presented draft rules last year that would have restricted the use of derivatives, which was interpreted as a way to diminish fund managers’ ability to keep highly leveraged products, notably 3x ETFs, on the market.

“I was surprised they [the staff]let them go,” Amy Doberman, a partner at Wilmer Cutler Pickering Hale & Dorr LLP who was previously general counsel of ProShares, a leveraged ETF provider, told the WSJ. “They are certainly not any less risky. I cannot imagine they are going to be any less susceptible to the impact of volatility that caused issues with the other [leveraged]funds.”

The SEC’s original approval of the 4x funds at the start of May appeared to have signaled that the regulator’s view of risky EFs had changed after form Chairwoman Mary Jo White stepped down in January. White led efforts to stamp down use of leveraged products but the proposal was not popular, especially among Republican lawmakers or regulators.

Under the President Donald Trump administration, which has taken a more hands-off approach to regulation, observers expected lessening controls over more restrictive regulatory measures. For instance, the U.S. Senate voted to confirm attorney Jay Clayton to head the SEC, a change in leadership that switched the course by which the agency approves investment products coming to market.

There are already a number of leveraged and inverse 3x or 300% U.S.-listed ETF options on the market. The proposed ForceShares ETFs will be the first to provide leveraged and inverse exposure of 4x or 400% to market moves. The UP fund is designed to deliver 400% of the daily performance of the S&P 500, whereas the DOWN fund will reflect the inverse 400% daily performance of the benchmark.

For more information on the ETF industry, visit our current affairs category.