(Bloomberg) -- A group of banks led by Bank of America Corp. and Barclays Plc shelved a roughly $3.9 billion debt offering on Thursday after struggling to attract demand from investors for the deal.

The transaction, which is helping to finance a buyout by Apollo Global Management Inc., is the latest large buyout financing to struggle. Wall Street banks face significant losses on tens of billions of dollars in high-risk leveraged buyout debt that they’re trying to offload, and are finding it increasingly tough to lure investors as yields surge. 

The banks underwrote the debt commitment for Apollo’s acquisition of the telecom and broadband assets from Lumen Technologies Inc., which will be run under the Brightspeed brand. That means they would be on the hook to provide the cash themselves and retain the risk on their balance sheets. The deal is expected to close on Oct. 3, according to a filing.

The transaction consisted of a $2 billion leveraged loan and a $1.9 billion junk bond, and an additional $1 billion loan that banks had already planned to hold. 

Representatives for Apollo and Barclays declined to comment. Representatives for Bank of America and Lumen did not immediately respond to requests for comment. 

Investors viewed the Brightspeed transaction as having significant execution risk in part because Brightspeed is planning a multi-billion dollar capital investment strategy to transition from copper to fiber. 

Read more: Banks Struggle to Find Demand for Apollo’s Brightspeed LBO Debt

The cost of borrowing has also increased sharply in recent months, with average junk-bond yields now yielding about 9.57%, according to Bloomberg index data.

(Updates with junk-bond yields. An earlier version of this story corrected the spelling of Bank of America in the first paragraph.)

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