UK Consultancy to Megacap Tech Loses Half of Value After Warning

  • Next 15 shares plunge after contract non-renewal spurs warning
  • Ad firms have struggled as tech clients curb marketing spend

Next 15 Group Plc headquarters in London. 

Source: Next 15

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A London-based marketing consultancy which counts some of the biggest US tech names among its clients saw its shares halve following a profit warning.

Next 15 Group Plc, whose customers include Amazon.com., International Business Machines Corp., Salesforce Inc. and ByteDance Ltd.’s TikTok, plunged as much as 53% on Friday in its biggest one-day loss on record. The AIM-listed firm said that one of the biggest customers of its Mach49 business has not renewed a contract, which had been expected to add more than £80 million ($105 million) of sales in 2026.