Since the billionaire activist disclosed a position in the burrito chain last year, it’s been hit by a norovirus scare and rodents falling from the ceiling. The latest quarter brought more woes: high avocado prices, hurricanes and the bill for a hacking attack. After terrible results late Tuesday sent shares tumbling, Ackman lost about $120 million on his stake overnight, according to data compiled by Bloomberg. Ackman’s Pershing Square Capital Management took an initial stake in Chipotle worth about $1.17 billion, according to regulatory filings.