"A week ago, I would've said you were a little crazy to think that these ETFs were going to get SEC approval," a Bloomberg analyst said.

-Ether ETFs took a major step toward becoming available in the U.S. as the SEC approved key regulatory filings.
-Just days ago, prospects for the ETFs looked bleak.

Spot ether (ETH) exchange-traded funds took a giant leap toward reality on Thursday after the U.S. Securities and Exchange Commission approved key regulatory filings tied to them, a milestone for the second-largest cryptocurrency.

They are not yet cleared to trade, though. The SEC gave its blessing to so-called 19b-4 forms tied to the ETFs, but the regulator must approve their S-1 filings before investors can buy them.

The approval follows a stunning turnaround by the markets regulator. After clearing spot bitcoin ETFs earlier this year, the SEC didn't seem to engage much with issuers on ether ETFs. That changed in recent days.

"A week ago, I would've said you were a little crazy to think that these ETFs were going to get SEC approval," James Seyffart, ETF analyst at Bloomberg Intelligence, said in an interview ahead of the decision.

In a statement, a Grayscale spokesperson confirmed the regulator had approved its 19b-4.

"At Grayscale, we appreciate the opportunity to engage constructively with regulators as they review spot Ethereum ETFs, and we remain optimistic about the potential of bringing Ethereum further into the US regulatory perimeter in the ETF wrapper," they said.

Would-be spot ether ETF issuers include BlackRock, Fidelity, Grayscale, VanEck, Franklin Templeton, Ark/21Shares and Invesco/Galaxy.

Although the approval of the 19b-4 filings suggests that regulators are willing to allow issuers to bring a spot ether ETF on the market, it doesn't guarantee that they will ultimately approve the final S-1 forms filed by all issuers.

"There is likely to be a gap before we see S-1 approvals and these ETFs begin trading. My guess is that this will take at least a week, but likely more. If history is any guide it could be much longer and be measured in months. But I personally think the gap will be measured in weeks. Everyone is just guessing right now though.” Seyffart said.

Regulators sent a shock wave through the industry on Monday when reports came out that issuers were asked to update their 19b-4 filings ahead of the SEC's deadline to approve or deny one of the issuers, VanEck’s filing.