The story showed how Bill Gross often clashed with Mohamed El-Erian - the departing CEO - and called himself "Secretariat" after the undefeated race horse.
On Thursday, Reuters' Jennifer Ablan reported that Bill Gross said he had evidence El-Erian wrote the story himself in order to "undermine" him.
The Wall Street Journal denied the claim in a statement to Business Insider (also given to Reuters):
"This is an astoundingly incorrect claim about a thoroughly reported article that was in the best tradition of The Wall Street Journal," a spokesperson said.