PEO Services: AI Visibility Market Discovery Index

Benchmark Summary

Questions This Section Answers

• Which PEO brands lead the October 2026 benchmark, and how wide is the gap between them?
• Which brands recorded a month-over-month coverage move beyond normal variation?
• How did the category trend across the full July to October series?

ADP TotalSource leads the PEO Services benchmark with 44.9% valid recommendation coverage in October 2026, ahead of TriNet at 41.5%, a gap of 3.4 percentage points. Valid recommendation coverage is the share of qualified observations in which a brand receives a valid recommendation.

Four brands recorded a significant month-over-month move in valid recommendation coverage beyond normal variation for their own series: ADP TotalSource (up 7.5 points to 44.9%), Insperity (up 7.1 points to 38.9%), Rippling PEO (up 7.0 points to 33.5%), and Paychex PEO (up 6.8 points to 27.8%). The remaining tracked brands moved within normal month-to-month variation.

Across the full July to October series, the category moved broadly upward from the September trough. TriNet recorded the largest increase from baseline, rising 5.3 percentage points from 36.2% in July 2026 to 41.5% in October 2026, and Insperity rose 4.9 percentage points from 34.0% to 38.9% over the same period. Justworks recorded the largest decline from baseline, falling 2.0 percentage points from 43.2% in July 2026 to 41.2% in October 2026. Most tracked brands declined or held between August 2026 and September 2026, while CoAdvantage, Justworks, and Vensure Employer Solutions edged up over that span; every brand except Vensure Employer Solutions then rose between September 2026 and October 2026.

The benchmark began with 778 prompt-surface observations in October 2026 and produced 352 qualified observations after qualification.

Current Benchmark at a Glance

Qualified surface breadth refers to the number of canonical AI/search surface families with at least one qualified observation: ChatGPT, Copilot, Gemini, Perplexity, AI Overviews, and AI Mode. September 2026 sat between the baseline and current month, with 396 qualified observations and a category low in valid recommendation coverage across most tracked brands.

For the strategic interpretation of this benchmark, read CiteWorks Studio's analysis of How AI Search Is Recommending PEO Services

Research Scope and Qualification

Questions This Section Answers

• How many prompt-surface observations qualified for the public benchmark, and where did the rest go?

The public benchmark is narrower than the raw collection universe by design.

Brand-level percentages use the qualified observations as the public denominator, not the raw collection. Link AI Visibility Market Discovery Methodology.

Current Brand Standings

Questions This Section Answers

• How do the top PEO brands compare on presence, valid recommendation coverage, and top-three rate?
• Which brands convert presence into first-position recommendations most effectively?

This table is the primary current-month benchmark view, sorted by valid recommendation coverage.

How to Read the Standings

• Presence rate: Share of qualified observations where the brand appears in the AI response.
• Valid recommendation coverage: Share of qualified observations where the brand receives a valid recommendation.
• Top-three rate: Share of qualified observations where the brand appears among the top three recommendations.
• Rank-one rate: Share of qualified observations where the brand is the first recommendation.
• Net sentiment: Positive minus negative mentions divided by total mentions, ranging from -1 to 1.

For formulas and denominator rules, see AI Visibility Market Discovery Metric Definitions.

Recommendation Coverage Movement

Questions This Section Answers

• Which PEO brands recorded the largest coverage gains and declines since the July 2026 baseline?
• What happened to coverage between August and October 2026 across the tracked brands?

Compared with September 2026, ADP TotalSource moved up 7.5 points to 44.9%, Insperity moved up 7.1 points to 38.9%, Rippling PEO moved up 7.0 points to 33.5%, and Paychex PEO moved up 6.8 points to 27.8%, each beyond normal month-to-month variation for its own series. Most tracked brands had declined or held during the August 2026 to September 2026 span, with CoAdvantage, Justworks, and Vensure Employer Solutions as the exceptions.

Largest Increase: TriNet

TriNet recorded the largest increase from baseline, rising from 36.2% valid recommendation coverage in July 2026 to 41.5% in October 2026, a gain of 5.3 percentage points. The brand moved from 36.2% in July 2026 to 37.1% in August 2026, down to 34.6% in September 2026, and up to 41.5% in October 2026. Its presence rate rose from 60.0% in July 2026 to 69.0% in October 2026, and its top-three rate rose from 15.2% to 28.1% over the same period.

Largest Decline: Justworks

Justworks recorded the largest decline from baseline, falling from 43.2% valid recommendation coverage in July 2026 to 41.2% in October 2026, a drop of 2.0 percentage points. The brand declined from 43.2% in July 2026 to 35.4% in August 2026, edged up to 35.6% in September 2026, and recovered to 41.2% in October 2026. Its rank-one rate rose from 8.8% in July 2026 to 15.9% in October 2026. In October 2026 Justworks recorded 56 of 352 qualified observations placing it first, the second-highest rank-one count among tracked brands behind ADP TotalSource.

Category Leader: ADP TotalSource

ADP TotalSource remains the category leader with 44.9% valid recommendation coverage in October 2026, ahead of TriNet by 3.4 percentage points and Justworks by 3.7 percentage points. ADP TotalSource also holds the highest top-three rate at 34.7% and the highest rank-one rate at 17.3% in October 2026. Its rank-one rate declined from 23.5% in July 2026 to 17.3% in October 2026.

Recommendation Placement Snapshot

Questions This Section Answers

• How does recommendation placement differ between brands with similar coverage levels?
• Which PEO brands turn coverage into first-position placement at the highest rate?

Coverage alone does not show how prominently a brand is recommended. Among the leading brands, placement varies notably. Justworks converts coverage into first-position placement at a much higher rate than TriNet, while ADP TotalSource leads on top-three placement.

Similar coverage levels can still hide different first-position rates. TriNet's 41.5% coverage came with a 3.4% rank-one rate, while Justworks' 41.2% coverage carried a 15.9% rank-one rate.

Buyer-Intent Distribution

Questions This Section Answers

• Which buyer-intent classes does the current benchmark capture, and which remain unmeasured?

All qualified observations in both months fell into the Brand Recommendation class.

The current public series measures Brand Recommendation discovery only and does not yet contain qualified observations for Pricing & Value or Multi-Brand Comparison queries.

Historical Measurement Record

Questions This Section Answers

• Which PEO brand has led valid recommendation coverage across each measurement period?
• What was the largest single-month coverage movement in the series so far?

This is an evergreen benchmark URL. New measurements are added to the same report.

Evidence and Source Layer

Questions This Section Answers

• What does the benchmark retain for each prompt-level observation?
• Does source presence prove that a source caused the recommendation?

The benchmark is built from prompt-level observations that retain the query, AI/search surface, answer, brand outcome, recommendation placement, sentiment, and, where exposed, citations or attributable evidence sources. Source presence is evidence about the information environment. It is not automatically proof that the source caused the recommendation.

Scope Boundaries

This public benchmark does not measure:

• Market share or revenue share
• Attributable sales or pipeline outcomes
• Every possible AI response, only the qualified observation set
• Organic-search ranking
• Social mention volume
• Private or sponsored channels
• Causality from a metric movement alone

Top 10 Cited Domains

Questions This Section Answers

• Which domains are cited most often across AI platform responses in October 2026?
• How concentrated are citations among the top domains?
• Which tracked brand domains appear in the top ten cited domains?

Across all AI platform responses in October 2026, the benchmark observed 5,674 citations drawn from 1,207 unique domains.

Citations are concentrated at the top of the distribution: the ten most-cited domains account for roughly 27.8% of all citations while representing less than 1% of the 1,207 unique domains observed. Four tracked brand domains appear in the top ten, with adp.com at rank one, trinet.com at rank five, justworks.com at rank seven, and rippling.com at rank eight, and gnapartners.com at rank ten corresponds to a tracked brand as well. Official brand sites and business media together dominate the list, with review and community sources such as business.com and reddit.com present at lower shares.

About This Benchmark

The LLM Authority Index AI Visibility Market Discovery Index tracks how AI-assisted discovery surfaces present brands within a vertical, measuring presence, recommendation coverage, placement, and sentiment across canonical AI/search surface families.

• AI Visibility Market Discovery Methodology
• AI Visibility Market Discovery Metric Definitions
• AI Visibility Market Discovery Research Standards
• Modeled AI Visibility Authority Value

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