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June 4 (Reuters) - Martin Sorrell's ad group S4 Capital SFOR.L on Thursday said it expects full-year like-for-like net revenue to be in line with analyst forecasts, even as market conditions in the first five months remained challenging.

S4, whose clients include Google parent Alphabet GOOGL.O, Amazon AMZN.O, and Meta META.O, said it expects like-for-like net revenue to be within the consensus analyst range of £632 million to £663 million ($848.8 million to $890.5 million), down low single digits from 2025 levels.

Sorrell, the executive chairman of S4, said it is making some progress on revenue growth but not enough, while margins were improving but had not yet reached the level the company wanted.

S4, which has been cutting costs and streamlining operations to support margins and reduce debt, said it expects operational EBITDA margin to improve by at least 100 basis points in 2026.

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