Guggenheim Partners, the money management company behind the increasingly popular BulletShares defined-maturity bond ETFs, filed paperwork with the Securities and Exchange Commission to market a floating-rate senior loan ETF to give investors dependable income at a time when rates could be rising.

The Guggenheim Enhanced Adjustable Rate Senior Loan ETF will have at least 80 percent of its assets invested in adjustable-rate senior secured loans as well as adjustable-rate revolving credit facilities, the filing said. The fund’s investments will mostly be rated “CCC” or higher, though the advisor can buy unrated investments that fit the criteria, as appropriate.

Floating-rate loan ETFs are coming into vogue as investors begin scouring the investment landscape for fixed-income securities that will hold their value should rates head higher. That day seems to be nearer, as banks stabilize, the loan markets revive and the jobs situation improves in the world’s biggest economy. Last Friday’s better-than-expected April jobs report kept the prospect of tightening credit in focus.

Other products, such as the PowerShares Senior Loan Portfolio (NYSEArca: BKLN) and the Market Vectors Investment Grade Floating Rate ETF (NYSEArca: FLTR), have come to market over the past few months and are definitely gathering assets. BKLN has gathered more than $120 million since its rollout in early March, while Van Eck’s FLTR has attracted almost $5 million since its launch in late April, according to data compiled by IndexUniverse.

Guggenheim said the loans the fund will invest in will generally be made by banks and other lending institutions. They are made to corporations, partnerships and other business entities. Also, the interest rates of the loans typically adjust based upon the then-current London Interbank Offered Rate (“Libor”) over periods ranging from one month to one year.

Guggenheim didn’t name the planned ETF’s ticker or its expense ratio.