Shares of Jack Dorsey’s Block ($SQ@US) sank nearly 15 percent by Thursday’s close. Short-seller Hindenburg Research released a report stating that the payment company was in its latest short position, claiming that Block enables criminal activity to operate with loose oversight. Hindenburg’s report alleged that Block’s Cash App profited from serving “unbanked” customers involved in criminal or illicit activity. In its two-year investigation, multiple former employees divulged how the company suppressed internal concerns and disregarded user concerns while alleged “criminal activity and fraud ran rampant on its platform.”