According to Stop & Shop's parent company, the 11 day strike that occurred in April had a negative impact on the chain's finances. In fact, the strike cost the company $345 million in the second quarter. Despite these losses, the company does not project that the chain will continue to struggle due to the strike during the second half of the year. While Stop & Shop's performance was negatively impacted, other brands owned by Ahold performed well.
See "The Stop & Shop strike in April cost the supermarket chain $345 million, company says", Stephen Singer, The Hartford Courant, August 7, 2019