Nuveen Investments, which has been angling to get back into the exchange traded funds business after a lengthy absence, said Thursday that the Securities and Exchange Commission (SEC) is extending the review period for a pair of Nuveen commodities mutual funds the firm is looking to convert to exchange traded funds.

Last year, Nuveen revealed plans to convert some of its commodities mutual funds to ETFs as part of its effort to reenter the ETF business.

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Last year, Nuveen said in a statement “shareholders of the Nuveen Diversified Commodity Fund (CFD), have approved the plan to convert the fund into an open-ended exchange-traded fund (ETF). The conversion plan is also contingent on customary regulatory approvals.”

Converting CFD to an ETF now requires regulatory and the fund could become an ETF by the fourth quarter. In May, Nuveen said shareholders of the Nuveen Long/Short Commodity Total Return Fund (CTF) , have approved the plan to convert the fund into open-ended exchange-traded fund (ETF). The conversion plan is also contingent on customary regulatory approvals, according to a statement.

Related: Nuveen Files Plans for Aggregate Bond ETF

“The proposed rule was published in the Federal Register on June 13, 2016, and was subject to an initial review period of 45 days. The SEC has now extended the review period for the proposed rule for an additional 45 days. If the SEC approves the proposed rule at the conclusion of this review period, the funds intend to complete their conversion to ETFs as soon as practicable thereafter,” according to a statement issued Thursday.

It was revealed last month that Nuveen filed plans with the SEC to possibly launch an aggregate bond ETF, the NuShares Enhanced Yield U.S. Aggregate Bond ETF .

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That ETF “would track an index comprised of investment grade government, corporate, residential and commercial mortgage-backed securities and asset-backed bonds. It will track an index called the TIAA Enhanced Yield U.S. Aggregate Bond Index (TIAA Global Asset Management owns Nuveen),” reports Chris Dieterich for Barron’s.

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