Largest Payroll Companies in the US in 2026: Revenue, Scale, and What the Rankings Hide

One company processes pay for 42 million workers. The next twelve combined do not match its revenue. Payroll is one of the most concentrated markets in enterprise software, and the reported numbers make it look even more lopsided than it is.

Key Takeaways

• ADP leads at $21.9 billion, larger than Workday and Insperity combined.
• PEO revenue is inflated by pass-through payroll and benefits costs, not software.
• Paychex grew 17% in fiscal 2026, almost entirely from the Paycor acquisition.
• Deel, Rippling, and Gusto each crossed $1 billion, growing far faster than incumbents.
• Interest on client funds earned ADP $1.35 billion in fiscal 2026 alone.

The 2026 Ranking by Reported Revenue

The table below ranks US-headquartered payroll and human capital management providers by their most recently reported full-year revenue. Fiscal years differ, so the reporting period is listed for each company. Private company figures are annual recurring revenue or trailing revenue as disclosed by the companies themselves.

Two rankings are happening here at once. One is a ranking of revenue, and the other is a ranking of software businesses. They are not the same list, and the gap between them is the most useful thing in this dataset.

Why ADP Is in a Category of Its Own

ADP closed fiscal 2026 on June 30 with $21.9 billion in revenue, up 7% year over year and 6% on an organic constant currency basis. Net earnings rose 8% to $4.4 billion. The company serves roughly 1.1 million clients and pays 42 million workers across 140 countries.

Client retention reached 92.1% for the year, which ADP described as ahead of expectations. New business bookings in Employer Services grew 6% to more than $2.2 billion. That single bookings figure is larger than the entire annual revenue of Paycom.

The detail that rarely makes it into rankings is float. Interest on client funds contributed $1.35 billion in fiscal 2026, close to the total annual revenue of Paylocity. Payroll processors hold employer money briefly before remitting it to employees and tax authorities, and at ADP's scale that timing gap is a billion-dollar business line on its own.

ADP guided fiscal 2027 to revenue growth of 5% to 6%. That is the honest ceiling for a business this saturated, and it is why the growth story in payroll has moved elsewhere.

The PEO Distortion: Why Insperity Looks Bigger Than Paycom

Insperity reported $6.8 billion in 2025 revenue, up 4%. On revenue alone it ranks third on this list, ahead of Paychex and more than three times the size of Paycom. That ranking is misleading.

Insperity is a professional employer organization, which means it reports gross billings including the wages and benefits costs it passes through for roughly 310,000 worksite employees. The actual margin on that revenue is thin and getting thinner. Gross profit fell 14% to $900 million in 2025, adjusted EBITDA dropped 51% to $131 million, and the company posted a $7 million net loss.

TriNet shows the same pattern more clearly because it separates the line item. Total 2025 revenue was $5.0 billion, but professional service revenues, the part that resembles a software fee, were only $719 million and fell 6% year over year. Average worksite employees declined 5% to about 334,000.

Both companies named the same culprit: elevated healthcare benefit costs that pricing has not fully caught up with. The scale of that exposure is easier to understand alongside total employment cost, which runs to roughly $96,900 per employee per year once taxes and benefits are included. If you rank by software-like revenue instead of gross billings, TriNet drops from fifth to near the bottom of this list.

Paychex Bought Its Growth, and It Worked

Paychex reported $6.51 billion for the fiscal year ended May 31, 2026, up 17%. That is the fastest growth rate of any incumbent on this list by a wide margin, and it is almost entirely inorganic. The Paycor acquisition, financed with debt issued in April 2025, drove both the revenue and the cost synergies.

Adjusted operating income rose 19% to $2.81 billion, with adjusted operating margin expanding to 43.2%. The company carried $4.6 billion in short and long-term borrowings at year end against $1.2 billion in cash and corporate investments.

Guidance for fiscal 2027 tells the real story: total revenue growth of 5% to 6%. Once Paycor laps into the comparison base, Paychex returns to the same mid-single-digit growth band as ADP.

The Mid-Market Cluster: Paycom, Paylocity, Dayforce

These three are the cleanest comparison on the list because all three sell software rather than gross billings.

Paycom

Paycom finished 2025 at $2.052 billion, up 9%, with adjusted EBITDA of $882 million at a 43% margin and zero total debt. Retention improved to 91%, client count reached about 39,200, and employee records stored grew 5% to 7.4 million. Guidance for 2026 is $2.175 billion to $2.195 billion, or 6% to 7% growth.

Paylocity

Paylocity reported $1.771 billion for the fiscal year ended June 30, 2026, up 11%, with recurring and other revenue up 12.2%. The company ended the year with roughly 44,400 clients, a 7% increase, and average revenue per client above $37,200. Fiscal 2027 guidance implies about 7% total revenue growth.

Dayforce

Dayforce left the public market in February 2026 when Thoma Bravo completed its acquisition at $70.00 per share, an enterprise value of approximately $12.3 billion, with a minority investment from the Abu Dhabi Investment Authority. Its last full reported year as a public company was 2024, at $1.76 billion in revenue and 98% gross revenue retention. Company guidance had put 2025 in the $1.93 billion to $1.95 billion range before the delisting closed off further disclosure.

The pattern across all three is identical: high retention, expanding margins, and growth decelerating toward high single digits. This is what a mature software category looks like.

The Challengers Are Where the Growth Went

Three private companies crossed the billion-dollar line within roughly twelve months of each other, and their growth rates have no equivalent among the incumbents.

Deel announced it surpassed $1.5 billion in annual recurring revenue in the first half of 2026, after crossing $1 billion in 2025 and recording its first $100 million revenue month in September of that year. The company reported three consecutive years of profitability, serves more than 35,000 clients across 150-plus countries, and was valued at $17.3 billion in a $300 million Series E co-led by Ribbit Capital with Andreessen Horowitz and Coatue.

Rippling crossed $1 billion in ARR in March 2026, growing 78% year over year with acceleration in three consecutive quarters. It serves more than 20,000 customers and was last valued at $16.8 billion in a $450 million Series G. The two companies remain locked in bilateral litigation stemming from the 2025 corporate espionage dispute.

Gusto passed $1 billion in trailing twelve-month revenue in early 2026, serving more than 400,000 businesses and remaining cash-flow positive. A June 2025 employee tender offer valued it at roughly $9.3 billion. Unlike most private software companies, Gusto reported earned revenue rather than ARR, which makes the figure directly comparable to the public names above it.

Cross-border payment infrastructure is the adjacent layer that has grown alongside these platforms. Providers such as Rise handle contractor and international worker payouts for companies that have outgrown domestic-only payroll but do not need a full employer-of-record setup. The fragmentation between US payroll, global payroll, and contractor payments is the main unsolved problem in the category, and it is where most acquisition activity is now pointed.

Consolidation Is Accelerating

The last eighteen months produced more structural change in this market than the previous five years combined.

• Paychex absorbed Paycor to move upmarket.
• Thoma Bravo took Dayforce private for $12.3 billion.
• UKG acquired Inova Payroll in December 2025.
• Paylocity bought Grayscale Labs in April 2026 for AI recruiting.
• Gusto acquired retirement provider Guideline in 2025 and compliance platform Mosey in April 2026.

UKG itself is a reminder of how opaque this market becomes once companies go private. Its last publicly disclosed quarterly revenue was $925 million for the quarter ended June 30, 2022, an annualized run rate of roughly $3.7 billion. Everything published about UKG's current scale is third-party estimation, and the range is wide enough that its position on this list should be treated as approximate.

With Dayforce now private and Gusto, Deel, and Rippling all still private, the share of this market that reports audited financials is shrinking every year. Rankings built on public data will describe less and less of the actual industry.

What This Means for Buyers

Revenue rank is a poor proxy for product fit. Insperity outranks Paycom by revenue and is a fundamentally different purchase, aimed at companies that want to outsource employment liability rather than buy software.

The useful segmentation is by employer size and geography. Gusto and Paychex dominate small business. Paycom, Paylocity, and Dayforce compete in the mid-market. ADP, Workday, and UKG hold the enterprise. Deel and Rippling win where the workforce crosses borders.

Vendor count matters as much as vendor size. The average company now runs nine separate HR systems at roughly $204 per employee per year, which is why every platform on this list is pitching consolidation rather than best-of-breed.

Growth rate matters more than size when evaluating a vendor's next five years of investment. A platform growing 78% is shipping product at a very different rate than one guiding to 6%. That cuts both ways, since scale also buys compliance coverage that a fast-growing challenger may not yet have in every jurisdiction.

For a narrower buying view, see our review of payroll platforms for startups, and for compensation context across the same employer segment, our 2026 startup salaries report.

Frequently Asked Questions

Which is the largest payroll company in the US?

ADP is the largest, with $21.9 billion in revenue for the fiscal year ended June 30, 2026. It serves approximately 1.1 million clients and pays 42 million workers across 140 countries.

Why does Insperity report more revenue than Paycom despite being a smaller software business?

Insperity is a professional employer organization and reports gross billings, which include the wages and benefits costs it passes through for client employees. Paycom reports software subscription revenue only. The two figures measure different things.

How much revenue do Deel, Rippling, and Gusto generate?

Deel surpassed $1.5 billion in annual recurring revenue in the first half of 2026. Rippling crossed $1 billion in ARR in March 2026 with 78% year-over-year growth. Gusto passed $1 billion in trailing twelve-month earned revenue in early 2026.

Is Dayforce still a public company?

No. Thoma Bravo completed its acquisition of Dayforce on February 4, 2026, at $70.00 per share and an enterprise value of approximately $12.3 billion. The stock was delisted from the NYSE and TSX.

Why do payroll companies earn interest income?

Payroll processors hold employer funds briefly between collection and disbursement to employees and tax authorities. That balance is invested, and at scale it becomes material. ADP earned $1.35 billion in client funds interest revenue in fiscal 2026.

Methodology

Figures come from company earnings releases, SEC filings, and direct company disclosures published between February 2025 and August 2026. Fiscal years vary by company and are labeled individually, so the table is not a like-for-like calendar comparison.

Private company figures are annual recurring revenue or trailing revenue as stated by the companies, and are not audited or independently verifiable. UKG's figure is an annualized run rate derived from its last publicly disclosed quarter in 2022 and should be treated as an estimate only.

PEO revenue includes pass-through payroll and benefits costs and is not comparable to software subscription revenue. Where possible, the professional service revenue component is cited separately in the analysis above.

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