Feb 1 (Reuters) - Shale investor Dan Wilks on Monday reported a 5.13% active stake in NexTier Oilfield Solutions NEX.N , saying the shares of the U.S. provider of hydraulic fracturing services are "undervalued" and that he may push for a sale or other alternatives.
The billionaire Wilks brothers have been acquiring stakes in hard hit services firms across North America, with Dan Wilks last month reporting a 7.5% active stake in troubled oilfield services firm ProPetro Holding Corp PUMP.N . Brothers LLC already owns hydraulic fracturing firm ProFrac Services and had recently engaged in a lengthy takeover battle for Canada's Calfrac Well Services Ltd CFW.TO .
Dan Wilks, who acquired the stake in NexTier through an investment vehicle, said he might propose capital allocation strategy, ownership structure and strategic transactions, including a sale as a whole or in parts as well as acquisitions or investments by NexTier, among others.
Dan Wilks and his brother Farris Wilks made their fortune during the shale boom through a company they founded called Frac Tech Services, which provided trucks to frackers.
NexTier, which recently changed its name following the combination of Keane Group and C&J Energy Services, was not immediately available for comment.