The industry you are joining redrew itself inside about twenty-four months. This brief is the short version of what happened, so that the rest of the semester has somewhere to stand. Read it once now. It will still be true at finals, and you will be quizzed on the numbers before then.
In November 2025, Omnicom completed its acquisition of Interpublic Group (IPG), and two of advertising's six great holding companies became one: the world's largest agency company, by revenue and by headcount. Trade coverage called it the biggest merger in the industry's history, and nobody argued (Adweek, Ad Age, Campaign, Nov-Dec 2025).
The aftermath moved faster than the deal did. Within about a week, the combined company announced roughly 4,000 job cuts. Within weeks it retired DDB, FCB, and MullenLowe as standalone brands: FCB traced its lineage to 1873, and DDB had carried Bill Bernbach's name since 1949. By mid-2026, investor updates counted more than twenty agency brands merged or sunset (Omnicom investor communications, via trade press).
WPP, the largest agency group until the Omnicom deal closed, spent 2025 and 2026 restructuring and declared it is 'no longer a holding company,' reorganizing into four AI-backed divisions (Campaign, Ad Age). Translate the corporate language: WPP is betting that clients now buy connected capability with AI inside it, and that a federation of separately branded agencies costs more than it wins. Whether the bet pays off is an open question. That the old model needed replacing is, at WPP's own scale, no longer treated as one.
Forrester, via trade press, puts the big holding companies' share of US ad spend at 44.6% in 2019 and about 30% by 2024. A third of their share, gone in five years, while total ad spend grew. The industry did not shrink. It moved: to in-house teams, to independents and specialist shops, to the platforms themselves, and to the creator economy. The giants are consolidating a shrinking share; the map around them is getting wider.
The ANA reports that 82% of its member advertisers run an in-house agency. That means the brand employs its own account, creative, and media people, and buys outside agencies for peaks and specialties. Two consequences follow. Agencies now compete with their own clients' shops for work and for talent. And in-house is a genuine first-job destination for account people: real seats, real clients, often closer to the P&L than an agency job gets you at the same age.
Staff-level agency jobs, the junior rung, are down 10 to 11% since January 2022, while manager and director headcount held (Live Data Technologies, via Adweek). Workers aged 20 to 24 are now 6.5% of the US advertising and PR workforce, down from 10.5% in 2019 (Bureau of Labor Statistics, via Adweek). Say it plainly: the classic bottom rung narrowed. AI sits inside that number, doing the assembly work juniors used to be hired to do, and entry-level postings that require AI skills roughly doubled year over year (trade press, 2025-26).