The firm did not disclose financial terms of the sale, but said it achieved the return two years after its initial investment in the high-carbon steel processor and distributor.
Last year the business had an £82m turnover across its six UK sites.
Endless partner Darren Forshaw said, “Our investment in Acenta Steel just over two years ago took place when its US owners viewed the business as non-core and the company faced some difficult challenges due to the volatility in worldwide steel demand.
“We recognised the long term prospects for the business and also the strength of its market position and its people.”
Earlier this year it was reported that Endless was interested in acquiring bankrupt high street music retailer HMV, whose debt was subsequently sold to retail restructuring specialist Hilco.
Back in December Endless agreed to back a management buyout of the embattled pork operations of meat processor Vion UK.
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