icahn enterprises lp’s stock iep rose 6 premarket friday after closing down almost 2 on thursday after short seller hindenburg research intensified his bearish bet on carl icahn’s investing arm and said he was taking aim at its bonds hindenburg run by nate anderson said the latest disclosures made wednesday by iep raised more questions about icahn’s personal margin loans or debt from the company as well as portfolio losses at iep the short seller also said disclosures intended to counter hindenburg’s may 2 report failed to address the issues raised the latest exchange in the war of words between anderson and the iconic activist billionaire hit iep’s stock and the company’s bonds in which anderson has taken a short position the stock is still down 375 in the year to date after a may 2 report from hindenburg that accused iep of inflating asset values and questioned icahn’s own borrowing from the company using his units as collateral for more see icahn stock renews skid as hindenburg says latest company disclosure raises more questions about company debt losses