Nordea shares staged a recovery on Monday, shedding the heavy losses inflicted by a mistaken Bloomberg headline the previous day.
The erroneous report, which falsely suggested negative developments at the Nordic lender, triggered a wave of automated selling that wiped nearly DKK 12 billion from the bank's market capitalization on Thursday.
Despite Nordea's rebound, the wider Copenhagen market struggled to find footing.
The C25 index closed 0.35% lower, reflecting persistent caution among investors.
While Vestas and ISS managed to post gains, the overall sentiment remained subdued as traders digested the week's opening session.
The incident underscores the vulnerability of algorithmic trading systems to data errors.