Summa Defence resumed trading after a one-day halt today, and shares slid sharply after the defense technology company said its planned agreement worth more than EUR 30 million with a NATO country will not be added to the order book this year.

After trading restarted in the afternoon, the Helsinki-listed stock fell more than 8 percent within two hours to around EUR 1.43.

The drone and vessel manufacturer said the prolonged negotiation and approval process has pushed the signing of the contract into the first half of 2026. Deliveries related to the order are now expected to take place in 2026 and 2027.

Summa first disclosed the negotiations on November 4 and said at the time that the potential deal would not impact its financial guidance for 2025.