17508: Sir Martin Sorrell Surveys His Failures.

Adweek interviewed Sir Martin Sorrell, who vomited vitriol in standard Sorrellian style.

 

The trade journal stated, “Sir Martin Sorrell has been an expert on M&A for almost half a century.”

 

Has he? It could be argued Sorrell’s expertise seriously eroded over the past decade at least.

 

His S4 Capital venture seems closer to breakdown than breakthrough.

 

Meanwhile, Sorrell’s notorious achievement—WPP—is a flaming dumpster. Indeed, the White holding company was death-spiraling toward a catastrophic crash landing long before Sir Peanut pulled the ripcord of his golden parachute.

 

Sir Martin Sorrell has been an expert…? At this point, he’s an expert has-been.

Sir Martin Sorrell Sees No Easy Exit for Holding Companies

 

Accenture should buy WPP and more insights from the S4 Capital executive chairman.

 

By Ryan Joe and Alison Weissbrot

 

Sir Martin Sorrell has been an expert on M&A for almost half a century. He founded WPP through reverse acquisition in 1985, and built it up into a towering ad giant that snapped up major agency brands like J. Walter Thompson, Ogilvy & Mather, and Young & Rubicam. 

 

Following an ignominious departure in 2018—WPP accused him of misusing company assets—Sorrell plotted a comeback, founding S4 Capital just weeks later. 

 

S4 built itself up through acquisition, notably production agency MediaMonks and performance agency MightyHive, positioning itself as a digital-first holdco. Lately, that thesis has been severely tested as many tech clients, where S4 has heavy exposure, pulled back on marketing spend to invest in AI. 

 

Revenue contracted, and shares fell about 38% over the course of last year, though its early 2026 results have indicated improvement. S4 currently views itself as being in a period of stabilizing its business before revisiting growth-by-acquisition. 

 

ADWEEK sat down with Sorrell to get his read on the market, who should buy whom, his competitors (whom he’s never been shy to criticize), and S4’s next steps.

 

This interview has been edited for length and clarity. It was conducted before Publicis said it would buy LiveRamp, and Accenture said it would buy Whalar.

 

ADWEEK: The ad agency holdcos have gone from the biggest industry acquirers to acquisition targets. What’s the outlook?

 

SIR MARTIN SORRELL: There are very few, if any, exits. No activists have stepped in.

 

There are no takers. Most of the big deals would involve syndicates. One PE firm couldn’t write the check for WPP or Dentsu. Maybe Bain Capital could have done it on their own.

 

Besides Publicis, is any big holdco a buyer at this point?

 

Omnicom probably isn’t. Dentsu is not going to be in buying mode. Stagwell will try. The irony may be, this is the time to take the risk because valuations are so battered. But I don’t think people would take a risk.

 

If anyone was going to take a risk, who do you think it would be? 

 

Well, Havas. Maybe not of scale. But [Havas CEO Yannick] Bolloré always sends you in the wrong direction. Always. Keeps you guessing.

 

And I think Accenture. If I was [Accenture CEO] Julia [Sweet], I would go for WPP. With them, they could get significantly better. I think the media piece in their hands would be very valuable. But whether they’ve got the balls though… It would be messy. But you’ve got David Droga there.

 

Publicis has been on a successful run. Is it sustainable?

 

What Publicis does—everybody says it’s all proprietary trading, which is why I think The Trade Desk thing is dangerous territory for them, they’re going to turn the microscope on themselves—is they look at the client as a whole.

 

Omnicom and WPP are falling into the trap of the matrix being driven by capability. The reorganization of WPP and the reorganization of Omnicom is capability-first, client second, geography third. Publicis and, indeed, ourselves is geography first, client second, capability third.

 

What’s wrong with organizing around capability?

 

You have warring factions. If you do it by country, you have inter-country rivalry, inter-region rivalry, that’s true, but you get people to integrate what they do. Publicis got it right. Can they maintain it? Well, the industry wisdom is these things go in cycles. 

 

Actually, John Wren, if you look at Omnicom Advertising Group before they acquired IPG, had a better strategy. He was trying to push them together. Publicis didn’t nudge. They were quite forceful. And it was painful for them. They were more violent than probably I would have been. But directionally, it was the same thing.

 

What do the holdcos look like in three years?

 

I don’t know what [WPP CEO] Cindy [Rose] is going to do. She has huge balance sheet problems. But I would guess Omnicom will still be here. Publicis will still be here. Dentsu will be in a different form. Havas will be in a different form. WPP will be in a different form.

 

Let’s talk about S4. You guys had a tech winter. Where are you in all of this?

 

It’s tough. We rely on wholesale AI adoption. We really depend on more car verticals, more financial services verticals, more packaged goods. If we can get a little bit more traction, it will be fine. But we need more traction. And we’re not organized enough. Our integration has not been perfect by any means. Liquidity is much better.

 

What does that traction look like and how do you get it?

 

Traction looks like building relationships. If you look at our biggest relationships—Google, Amazon, T-Mobile, Disney, GM, Meta—there’s good stuff there, but the problem is that 45% of it is tech. And they’re all spending money on capex.