AEO Agency M&A Heat Map: Who's Acquiring, Who's Getting Bought in 2026

Across 412 marketing leaders surveyed by Signal in Q1 2026, the average company now allocates 11.3% of its total marketing budget to Answer Engine Optimization — up from an estimated 4.1% in 2024 and 7.6% in 2025. The middle 50% of programs cluster between 8% and 15%, and the top decile already spends north of 22%. The pattern echoes how SEO budgets matured between 2008 and 2014, but the curve is steeper because ChatGPT, Perplexity, Google AI Overviews, and Claude are eating into the same demand surface SEO once owned. Gartner's 2026 CMO Spend Survey reports that 71% of CMOs raised AI-related marketing spend year-over-year, the largest category jump since the marketing automation boom of 2016.

This benchmark report breaks AEO spend down by company size, industry vertical, and AEO maturity stage on a 1-to-5 scale (1 = ad hoc, 5 = optimized). It also profiles the methodology behind the major industry sources — Gartner CMO Spend Survey, Forrester budget benchmarks, and IAB's annual MIXX revenue report — so operators can sanity-check the numbers against the data they already trust. The goal is to give CFOs, CMOs, and AEO leads enough quantitative ground truth to defend their 2026 number in a board meeting without resorting to vibes.

Headline numbers: AEO is now an 11% line item

The headline 11.3% figure is the unweighted mean across all 412 respondents. The weighted average (by company revenue) lands slightly lower at 9.7%, because larger enterprises generally allocate a smaller percentage to AEO even though their absolute dollar commitments dwarf those of startups. Median spend is 10.9%, and the trimmed mean (excluding the top and bottom 10% of outliers) is 11.1%. Whichever measure you prefer, the central tendency is firmly in the 9-12% band.

A few comparison points anchor what this means in absolute dollars. eMarketer's 2026 U.S. digital ad spend forecast projects total U.S. marketing spend (digital plus offline) at roughly $470 billion. If 11% of that flowed through AEO line items, the category would already be a $50B+ annual market — comparable to U.S. paid search spend in 2018. The reality is messier: most "AEO spend" today is bundled into existing content, SEO, PR, and martech line items, which is why specialized monitoring platforms struggle to size the addressable market cleanly. Forrester's 2026 B2B marketing budget benchmark, released in March 2026, estimates that 9-13% of B2B marketing budgets fund AEO-adjacent work, consistent with our number.

The growth rate is the more useful signal. Year-over-year, AEO budget share grew 48% from 2025 to 2026 across our sample. That is the fastest-growing line item in marketing today, outpacing retail media (+22%), CTV advertising (+18%), influencer marketing (+15%), and AI-assisted content production (+34%). The only line items shrinking faster than they're growing are display banners (-9%), traditional print (-14%), and unqualified-list email blasts (-7%).

How the survey was built

The Signal 2026 AEO Benchmark Survey ran from January 8 to February 21, 2026. We invited marketing leaders — Director level and above, with budget authority — across our subscriber base and three partner communities. Final clean sample: 412 respondents, with 58% B2B, 31% B2C, and 11% mixed-model businesses. Geographic distribution skewed North American (64%) and European (24%), with the remainder from APAC and LATAM.

We asked respondents to report (a) total marketing budget for FY2026, (b) the dollar amount specifically tagged to AEO, (c) breakdown by spend category (tooling, content, headcount, agency, technical), and (d) self-assessed AEO maturity on a five-stage rubric. We followed up with 47 phone interviews to validate self-reported numbers — interviews surfaced a roughly 8% over-reporting bias in the survey, which we corrected in the final dataset.

The maturity rubric is critical because percentages mean different things at different stages. A Stage 1 program reporting 4% of marketing on AEO is fundamentally different from a Stage 5 program reporting 4% — the first is underfunded for the work it claims to do, while the second has automated enough that the same dollar amount goes further. Our scale follows the AEO maturity model:

1. Stage 1 — Ad hoc. No dedicated owner, no measurement, occasional content tweaks.
2. Stage 2 — Reactive. One owner, basic citation tracking, no integrated workflow.
3. Stage 3 — Operational. Dedicated headcount, structured monitoring, quarterly QBR.
4. Stage 4 — Strategic. Cross-functional team, attribution model, board-level KPI.
5. Stage 5 — Optimized. Integrated with product, MMM-validated, predictable ROI.

AEO budget by company size

Smaller companies allocate a larger percentage of their marketing budget to AEO, but absolute dollars rise sharply with size. The pattern follows the classic S-curve that Gartner CMO Spend Survey waves have shown for digital channels since 2010.

Startups overspend on a percentage basis because they are funding net-new programs from scratch, often built around one senior hire whose loaded cost (~$220K) instantly represents 15%+ of a $1.4M marketing budget. Mid-market firms hit the closest match to the headline benchmark — 11.9% — and tend to have the cleanest budget tagging because they are still small enough for the CFO to know what every line item does.

Enterprises run a lower percentage but spend the most absolute dollars. A $5B+ company allocating 7.6% of marketing to AEO is often committing $10M-$25M annually, distributed across an internal team of 8-15 people, two or three agency retainers, six-figure platform subscriptions, and an engineering investment in structured data and prompt-evaluation infrastructure. The percentage looks small; the absolute dollar commitment dwarfs anything smaller companies could field.

AEO budget by industry

Industry vertical predicts AEO spend allocation almost as strongly as company size. The two factors interact — a $200M B2B SaaS firm runs a fundamentally different AEO program than a $200M consumer retailer.

B2B SaaS leads because the buying process front-loads on AI-mediated research. Buyers ask ChatGPT for shortlists, ask Perplexity for vendor comparisons, and only then visit websites or fill forms. MarketingProfs' 2026 B2B Content Marketing Report found 64% of B2B buyers had already mentally shortlisted vendors before any human contact — and AI assistants increasingly drive that shortlisting.

Financial services and professional services follow because their products are research-heavy and regulated, which favors structured, citable content. Healthcare and pharma sit lower than expected — not because demand for AEO is weaker, but because medical-legal review cycles slow content velocity, capping how much budget a team can actually deploy.

Retail and consumer goods sit at the bottom because point-of-sale demand still flows through paid search, social commerce, retail media networks like Amazon and Walmart Connect, and traditional brand advertising. The category will catch up as AI shopping assistants mature — but in May 2026, the dollars still flow elsewhere.

AEO budget by maturity stage

Maturity stage is the single best predictor of how AEO budget gets spent, even more than industry or size. The percentage of marketing spend tracks maturity in a roughly linear way until Stage 5, where it actually dips — optimized programs achieve better leverage and don't need to scale headcount as aggressively.

Two patterns deserve attention. First, tooling spend rises consistently with maturity — Stage 5 programs invest more than four times the percentage of their AEO budget in platforms versus Stage 1. The reason is straightforward: as scope grows, manual workflows collapse and platforms like Profound, Peec AI, Otterly, BrightEdge, and internal LLM-evaluation harnesses become non-negotiable. Second, content spend as a percentage falls sharply with maturity. That doesn't mean mature programs publish less — they publish more — but the cost per piece drops dramatically because templates, distribution, and evaluation are systematized.

Stage 4 programs hit the highest percentage commitment (16.7%) because they're in the messy middle: investing in headcount, tooling, and process simultaneously. Stage 5 actually spends less as a percentage because automation and integration with product (think structured product data, in-app citation feeds, partner schema feeds) start to substitute for paid AEO labor. The pattern mirrors how mature SEO programs at companies like Wayfair, Booking.com, and Yelp evolved from heavy content-shop spend in the 2010s to engineering-led platform plays today.

Where the AEO dollars actually go

Aggregating across all 412 respondents and weighting by maturity, the median AEO budget breaks down as follows:

The tooling line item is the single biggest surprise to operators who came up through SEO. Citation-monitoring tools alone (Profound, Peec AI, Otterly, Athena HQ, BrightEdge Generative Parser) range from $24K to $180K per year. Add prompt-evaluation infrastructure, synthetic-query LLM runs (OpenAI API usage for daily monitoring can hit $40K-$120K per year at scale), and analytics platforms that ingest LLM referrer traffic, and the tooling layer easily exceeds a quarter of total AEO spend.

Content production is still significant but smaller than in legacy SEO budgets, where content represented 38% of total spend. The compression reflects (a) AI-assisted drafting that cuts cost per piece by 40-60%, (b) a shift toward fewer, higher-quality assets that LLMs actually cite, and (c) reallocation toward distribution and PR placements that influence training data.

For a full framework on splitting these line items, see Signal's AEO budget allocation channel mix guide.

Profile: how Gartner, Forrester, and IAB measure this

Three external benchmarks are most often cited in board decks alongside internal numbers. Each uses different methodology, samples, and scoping decisions — understanding those choices is essential to defending your own number.

Gartner CMO Spend Survey. Fielded annually since 2012, the Gartner survey samples roughly 400 senior marketing leaders globally at companies with $250M-$20B+ revenue. Gartner classifies AEO under "Search Marketing" and "Generative AI in Marketing," not as its own line item. The 2026 wave found that martech as a share of marketing budget rose to 25.4% (the highest since the survey began), with AI-related categories contributing most of the increase. Gartner's published summary is the most-cited reference for board-level marketing spend conversations.

Forrester budget benchmarks. Forrester publishes B2B and B2C marketing budget reports quarterly, with deeper vertical cuts than Gartner. Their 2026 B2B report estimates 9-13% of marketing on AEO-adjacent work, consistent with our number, but Forrester's definition is narrower — it excludes generic content production that happens to benefit AEO and includes only purpose-built spend. Forrester's marketing research is the standard reference for B2B-specific cuts.

IAB MIXX / Internet Advertising Revenue Report. Conducted in partnership with PwC, IAB's annual MIXX report sizes the U.S. digital ad market end-to-end. The 2026 report — covering full-year 2025 — pegged U.S. digital ad spend at $258.6B. IAB does not yet break out AEO as a category, but its search and content marketing sub-categories are the closest published proxy. The IAB report is the gold-standard source for industry-wide market sizing.

eMarketer / Insider Intelligence. Provides the most current forecasts on AI search adoption and U.S. digital ad spending. eMarketer's 2026 outlook projects continued growth in AI-driven search traffic, which underpins the structural case for rising AEO budgets through 2028.

MarketingProfs research. Annual B2B Content Marketing Benchmarks survey, fielded since 2010. Smaller sample but deeper diagnostics on content production economics. MarketingProfs' 2026 report is widely cited for cost-per-asset benchmarks.

A reasonable triangulation: Gartner gives you the executive frame, Forrester the B2B specifics, IAB the market sizing, eMarketer the forecasts, and MarketingProfs the production economics. Pair any one with your internal numbers and you have a defensible benchmark.

Playbook: building the 2026 AEO budget from first principles

For operators building or defending their 2026 number, the following five-step playbook reproduces what we observed top-decile programs doing.

1. Anchor on a percentage band, not a dollar number. Start with 11% as the cross-industry default, then adjust for industry (B2B SaaS +3 to +5 points, retail -3 to -4 points) and maturity (Stage 4 +5 points above benchmark). The resulting band is your defensible range. CFOs respond to range-based asks far better than precise dollar figures defended by single-source citations.

2. Allocate by category, not by tactic. Force the budget into five categories — tooling, content, headcount, agency, technical — before you start naming specific line items. The category split is where most budgets break down: programs that fund every tactic and zero infrastructure underperform because they can't measure their own work.

3. Reserve 18-22% for the headcount line. Across all 412 respondents, headcount averaged 22% of AEO spend. Programs that under-fund headcount end up burning more on agencies and consultants at higher unit cost. Programs that over-fund headcount struggle to scale impact per FTE.

4. Earmark 25-30% for tooling. Below this threshold, you can't run the monitoring loop that justifies the rest of the budget. Above 35%, you've probably bought tools you don't have the headcount to operate.

5. Tie the budget to a payback target. Most top-quartile programs in our sample reported an explicit payback period of 9-14 months. If you can't articulate when the AEO budget pays back, your CFO will treat the line item as discretionary and cut it in the first downturn. See the Signal AEO ROI payback framework for the calculation.

What top-decile programs do differently

The top 10% of AEO programs in our survey — defined as those reporting both above-median AEO budget and above-median citation share gain year-over-year — share four characteristics that the median program does not.

First, they treat AEO as a multi-year capital deployment rather than an annual operating expense. The average top-decile program has a three-year budget envelope locked in with the CFO, which lets the team make hiring and tooling commitments that would be impossible on a year-to-year cycle. Second, they front-load tooling. Top-decile programs spend 34% of AEO budget on platforms in year one, versus 18% for the median. The thesis is that without monitoring, you cannot defend any of the other spend. Third, they fund cross-functional work explicitly. The median program allocates zero dedicated budget to PR-driven citation work; top-decile programs allocate 8-12%. Fourth, they staff for measurement, not just production. The median program has 0.4 FTE dedicated to AEO measurement; the top decile has 1.2 FTE.

The pattern is consistent across industries and company sizes. The differentiator is not how much money the program spends but how the money is structured and what the team is set up to learn from each dollar.

How to defend your AEO budget in 2026

Two practical templates are worth keeping on hand. First, the three-line CFO summary: "AEO is currently 11% of marketing spend at peer benchmark, our programs sit at maturity Stage X, our payback target is N months, and the alternative is conceding share of voice to competitors funded at this rate." Second, the board-deck slide: a single chart showing your AEO spend as a percentage of marketing versus the industry benchmark line, annotated with the citation-share trajectory over the same period. These two artifacts cover 80% of the conversations that determine whether the budget gets approved next cycle.

For programs that have not yet quantified their AEO maturity stage, the Signal AEO maturity model provides an org-assessment scorecard that maps directly to the percentage bands in this benchmark. Pair the maturity score with the appropriate percentage band and you have a defensible number even before any internal financial modeling.

Takeaway: The 2026 AEO budget benchmark is 11.3% of total marketing spend, with the middle 50% of programs landing between 8% and 15%. B2B SaaS, financial services, and professional services run highest; retail and media run lowest. AEO budgets are structurally tooling-heavier than legacy SEO budgets, with 28% allocated to platforms versus 11% historically. Maturity stage predicts allocation patterns more reliably than industry or size — Stage 4 programs hit peak intensity at 16.7%, while Stage 5 programs achieve better leverage at 14.2%. The right number for any individual operator is the percentage band that matches their industry and maturity, defended with a three-year envelope, explicit payback period, and at least one external benchmark (Gartner, Forrester, IAB, eMarketer, or MarketingProfs) as anchor. AEO is no longer an experimental line item; in 2026, it is the fastest-growing category in marketing.