Shares of oil services firm ProFrac Holding Corp. gained only 11 cents in their trading debut after its $288 million initial public offering showed the continuing weakness of the US market. ProFrac opened trading Friday at $17.60 a share after selling 16 million shares for $18 each in the IPO. The shares briefly rose as high as 5.3% but closed up 0.6% to $18.11, giving the company a market value of $2.54 billion. The Willow Park, Texas-based company, like contact lens maker Bausch + Lomb Corp. last week, had marketed its shares for $21 to $24. Bausch + Lomb, whose shares also sold for $18 in its IPO, has since fallen ... (full story)