Top 44 SEO Agencies in AI Answers — September 2026

Searchbloom and Thrive Internet Marketing Agency share the top position at 11.3% named frequency, but their paths to that ranking diverge by engine. Thrive shows strength at Claude (15%) and dominates at Perplexity (22.5%), but records 0% at Grok and ChatGPT. Searchbloom performs more consistently across the middle range, peaking at Perplexity (20%) and Claude (12.5%) but falling to 2.5% or lower at Google Gemini, Google AI Overview, and Grok. Neither brand achieved citations from its own domain despite being named frequently, indicating that engines favor third-party sources when they cite at all.

WebFX, Victorious, and First Page Sage round out the top five. WebFX (10.6%) stands apart for achieving 18.2% citations from its own domain—webfx.com—the highest rate in the ranking; it appears most prominently at Grok (22.5%) and Perplexity (20%). Victorious (7.9%) peaks at Grok (15%) and Claude (10%) but drops to 2.5% or lower at Google AI Overview and ChatGPT. First Page Sage (6.6%) relies heavily on Claude (7.5%) and Perplexity (15%) while recording 0% at Grok and ChatGPT. The next tier—Ignite Visibility (4.6%), Straight North (4%), Focus Digital (3.3%), Funnel Boost Media (3.3%), and OuterBox (3.3%)—shows further fragmentation by engine, with no brand achieving more than 10% on any single engine except Ignite Visibility at Google Gemini (9.7%).

Below the top ten, mention frequency drops sharply. Directive (2.6%) spikes unusually at Grok (20%) but records 0% or near-zero at Google Gemini, Google AI Overview, and Perplexity, suggesting a single strong recommender rather than consistent visibility. SEO Brand (2.6%) and Titan Growth (2.6%) distribute more evenly across engines with lower peaks. NisonCo (1.3%), Breaking B2B (0.7%), Markitors (0.7%), and Single Grain (0.7%) record single-digit or sub-percent mention rates, with Single Grain notably appearing in engines' lists but also recording one negative mention across the dataset.

Twenty-seven brands received zero mentions: Accelerate Agency, Boxi, Brafton, Casjay, Conductor, Digital Silk, Distilled, Element Three, G2 Hill, HubShout, KlientBoost (0% named despite 0.6% domain citation), Metric Theory, Optmyzr, Portent, Revenue River, Searchmetrics, SeoClarity, Seoplus+, SERPhouse, SevenAtoms, Siteimprove, SparkPost, Station Two, ThinkSEM, Wpromote, WSI, and Zazzle Media. Among these, only KlientBoost, SevenAtoms, Siteimprove, and Portent registered any domain citations at all, and at rates below 2%. The zero-mention category represents 61% of tracked brands, indicating extreme concentration at the top of the field.

The six engines show starkly different recommendation behavior. Perplexity names the most distinct brands (14) and concentrates most heavily on leaders: it places Thrive at 22.5%, Searchbloom at 20%, and WebFX at 20%, creating an outsized share of top-tier mentions. Claude names 12 distinct brands and distributes more broadly, with Thrive at 15%, Victorious at 10%, and Straight North at 10%. Google Gemini, ChatGPT, and Google AI Overview each name only 8 or 9 distinct brands and favor narrower slices of the field. Grok names 10 brands but shows extreme concentration: it places WebFX and Directive each at 22.5% while recording 0% for most competitors, suggesting fewer but more decisive recommendations.

Citation behavior diverges even more sharply. Perplexity cites brands' own domains in 2% of answers—the highest rate—while Google Gemini and Grok follow at 0.8% and 0%, respectively. Claude, ChatGPT, and Google AI Overview all cite at rates below 0.3%. Grok returns zero citations despite naming brands, relying entirely on unaided names. Across all engines, third-party directories and review sites dominate: Clutch.co, DesignRush, and Semrush's agency database account for 141 citations, while vendor domains like webfx.com and clutch.co (a vendor's own site) collectively receive only 386 of 1,471 total citations. This 74.2% reliance on external sources indicates that engines prioritize established review platforms over vendor sites for credibility.

The divergence between engines creates a fractured competitive landscape. A brand ranked top-5 on Perplexity may rank outside the top-15 on ChatGPT or Google AI Overview; Directive's 20% at Grok versus 0% at Google Gemini exemplifies this fragmentation. No single brand achieves balanced strength across all six engines, suggesting that recommendation patterns reflect each engine's training data, citation policies, and algorithm rather than a consensus on category leaders. Buyers using different AI answer engines will receive meaningfully different recommendations.