WPP reported like-for-like revenue decline of 1.3% in Q4 2024, narrowing from 2.4% in Q3, while S4 Capital posted sequential gross profit growth of 8% quarter-on-quarter after sixteen months of contraction. The numbers arrived within five trading days of each other in late February, marking the first concurrent stabilization signal from the two entities since Martin Sorrell departed WPP in 2018 to build S4.
WPP's operating margin expanded 40 basis points year-over-year to 14.2% despite revenue headwinds, driven by workforce reductions totaling 6,200 roles and real-estate footprint compression across seventeen markets. S4 simultaneously closed a $150 million debt facility with HSBC and Barclays, replacing shorter-term credit lines and extending maturity to 2028. The facility pricing sits at SOFR plus 225 basis points, 75 basis points tighter than S4's previous revolver, reflecting improved credit assessment after three consecutive quarters of positive EBITDA.
The holding-company correction that began in mid-2022 is now entering a different phase. WPP's client-retention rate held at 94% through 2024, unchanged from 2023, indicating the revenue decline stems from scope compression rather than account losses. Technology clients reduced spending 18% year-over-year, but CPG and automotive clients increased combined spend 7%, partially offsetting the mix shift. S4's content-production vertical, which represented 41% of gross profit in 2023, grew 12% in Q4 2024, the fastest pace since Q2 2022.
Two structural shifts merit attention. First, both holding companies now derive more than 30% of revenue from first-party-data and commerce-media services, categories that did not exist as distinct P&L lines in 2019. WPP's commerce-media unit grew 22% in 2024, reaching $1.8 billion in revenue. Second, the cost-of-sale differential between holding companies and independent agencies has compressed 900 basis points since 2021, as technology-platform expenses migrated from capital outlays to operating costs, equalizing the burden across agency models.
The private-equity calendar provides context for the timing. Holding-company valuations trade at 8.2x forward EBITDA, below the 11.5x median for PE-backed agency roll-ups, creating a $4.2 billion valuation gap across the sector. CVC Capital Partners and Bain Capital each hold stakes in agencies generating combined revenue above $2 billion, with typical hold periods entering years six and seven. The stabilization at WPP and S4 reduces the multiple arbitrage available to PE sellers, potentially extending hold periods or forcing markdown exits.
Operators should track three specific events. WPP's annual capital-markets day is scheduled for May 14 in London, where management will present three-year margin targets and detail the planned integration of AKQA and Grey into a single unit. S4 reports Q1 2025 results on May 8, which will confirm whether gross-profit growth persists beyond seasonal Q4 strength. The third event is less defined: commentary from Publicis and Omnicom on their April earnings calls regarding commerce-media margin profiles, which will clarify whether the category expansion is margin-accretive or a share-shift within existing budgets.
The forward calendar also includes labor-cost reset points. WPP's annual compensation review concludes in April, typically resulting in 3-4% base-salary increases. S4 operates on a January review cycle, meaning Q1 margins will reflect full-year compensation decisions. Both companies face May renewals on $380 million in combined property leases, concentrated in New York, London, and Singapore, where landlords have shown 12-18% flexibility on rate reductions in exchange for term extensions.
The holding-company revenue trough appears to be forming, not because client spending reversed, but because portfolio surgery and cost recalibration reached operational limits. WPP cannot reduce much further without impairing delivery capacity on retained accounts. S4 cannot grow much faster without rehiring the 1,100 roles cut since June 2023. What comes next depends less on macro advertising spend—flat to +2% in 2025 according to GroupM—and more on whether commerce media expands total addressable budgets or simply redistributes existing allocations. The May 8-14 reporting window will clarify which outcome is materializing.
The takeaway
Sequential margin expansion at WPP and S4 suggests holding-company correction is stabilizing, compressing PE exit multiples by **300 basis points**.
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