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Art of Accounting: Top 100 10-year comparison

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Enjoy complimentary access to top ideas and insights — selected by our editors.

Public accounting is a growing profession. The growth from 2015 to 2025 in revenues was 125% and in total personnel 113%. These are real numbers and vitiate what the naysayers claim about the doom and gloom of the profession.

Last week I provided an analysis of the Top 100 numbers that appeared in the March 2025 issue. What I did was actually simple and was typical of what I do for clients and teach my students. Rather than accepting the aggregate numbers, I look beneath them. In this situation I did a few things. I broke the total amounts into three groups based on revenues and used that to analyze the relative performance of the three groups, and I think I came up with some reasonable conclusions. You can look at last week’s issue to see what they were.

This week I looked at the changes over the last 10 years and will discuss some of my observations here. The revenue growth was impressive, but it came primarily from the group of 12 and then the other 84, with the lowest percentage increase from the Big Four. Also the growth of employees was the lowest for the Big Four and greatest for the group of 12. To see what this means, I looked at the revenue per employee. The Big Four’s revenue per employee was virtually flat, indicating no growth, which I translate as stagnant efficiency or effectiveness. That would seem to retard profit growth. Running a business with a growing top line and presumably a large growth in technology usage but flat revenues per employee does not make sense. 

Top 100 Firms – 2025 compared to 2015 selected data
Data from Accounting Today 2025 and 2015 Top 100 Firms issues
Data compiled by Edward Mendlowitz, CPA
Partner %
$ revenues Total to total
2025 millions Offices Partners employees employees
Big Four 91,046 389 17,172 352,620 4.87%
Next 12 23,918 718 8,309 95,374 8.71%
Remaining 84 16,165 1,043 7,578 70,914 10.69%
Total 131,130 2,150 33,059 518,908 6.37%
% of Big Four to total 69.43% 18.09% 51.94% 67.95%
% of Next 12 to total 18.24% 33.40% 25.13% 18.38%
% of Other 84 to total 12.33% 48.51% 22.92% 13.67%
2015
Big Four 43,402 360 10,234 167,557 6.11%
Next 12 8,315 491 3,786 40,201 9.42%
Remaining 84 6,519 626 3,749 35,331 10.61%
Total 58,236 1,477 17,769 243,089 7.31%
% of Big Four to total 74.53% 24.37% 57.59% 68.93%
% of Next 12 to total 14.28% 33.24% 21.31% 16.54%
% of Other 84 to total 11.19% 42.38% 21.10% 14.53%
10-year change
Big Four 47,644 29 6,938 185,063 -1.24%
Next 12 15,603 227 4,523 55,173 -0.71%
Remaining 84 9,646 417 3,829 35,583 0.08%
Total 72,893 673 15,290 275,819 -0.94%
% of Big Four to total 109.77% 8.06% 67.79% 110.45%
% of Next 12 to total 187.65% 46.23% 119.47% 137.24%
% of Other 84 to total 147.96% 66.61% 102.13% 100.71%
% of Total change 125.17% 45.57% 86.05% 113.46%
2025 Percentages of services
A&A Tax MAS/Other
Big Four 28.50% 24.00% 47.75%
Next 12 33.50% 35.67% 30.75%
Remaining 84 30.25% 37.17% 32.58%
2015
Big Four 35.00% 25.75% 39.25%
Next 12 42.67% 31.92% 25.42%
Remaining 84 38.23% 35.13% 26.64%
10-year change
Big Four -6.50% -1.75% 8.50%
Next 12 -9.17% 3.75% 5.33%
Remaining 84 -7.98% 2.04% 5.95%
Revenue Revenue
per per
2025 partner employee
Big Four 5,302,003 258,199
Next 12 2,878,609 250,785
Remaining 84 2,133,179 227,955
Total 3,966,532 252,703
2015
Big Four 4,240,962 259,028
Next 12 2,196,241 206,835
Remaining 84 1,738,968 184,523
Total 3,277,413 239,568
10-year change
Big Four 1,061,042 -830
Next 12 682,367 43,950
Remaining 84 394,211 43,432

However, there was significant growth in revenues per employee in the other groups. I did not use percentages, but dollars of growth. Both of the other groups had similar growth of about $43,000 annual revenue per employee. Looking at the overall total of $13,000 per employee does not provide any insights other than macro growth for the Top 100. If I were managing a Big Four firm, I would seriously look at this. I did not look at each of the Big Four separately. I could have but do not want to make a career out of this as my aim is to provide insights and comparative data to readers. 

Another thing I want to point out is a reiteration of what I wrote last week about the MAS grouping of the Group of 12 being closer to the remaining 84 than the Big Four. Looking at this from 2015 indicates that the MAS group grew similarly to the two smaller groups, while the Big Four grew significantly. Also the A&A for all three declined as a percentage of revenues, while the taxes grew for the group of 12.

I also want to point out that using aggregate data doesn’t usually provide the information clients need. And my “teaching” self wants to inject a lesson here that what I did here can be done for every one of your clients. I do it, and so can you.

A final observation. Last week I provided the average revenues and staffing of the bottom five firms. That was 64.5 million revenues and 312 total employees. Ten years ago, these were $33.2 million and 201 total employees. Revenues almost doubled and headcount grew 50%. This indicates growth with much more efficiency and effectiveness or better pricing. The revenue growth was below each of the three groups, but the lower headcount growth is very impressive. Better numbers could be obtained by segmenting into more groups. Do that if you want. This is a column for accountants with the purpose of providing a method of looking at data more effectively. When I advise my clients, I work out the right data to advise them with. One suggestion for those running an accounting practice in the Top 100 is to look at the five firms above and below you and see how you are doing. Then look further above and consider setting that as a goal.

There is a lot more to do. There always is a lot more to do. Use this and last week’s charts and the Top 100 list and figure out what works for you. Use my process to look beyond the primary chart and come up with helpful observations. And this process should be applied to your business clients.

Do not hesitate to contact me at [email protected] with your practice management questions or about engagements you might not be able to perform. 

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Accounting

SEC’s Semiannual Reporting Proposal Faces Investor Pushback: What CFOs Need to Know

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U.S. Securities and Exchange Commission (SEC)

A proposal from the U.S. Securities and Exchange Commission to potentially shift some public companies away from quarterly financial reporting toward a semiannual model is drawing significant pushback from investors, even as it continues moving through the regulatory process. The debate has direct implications for corporate finance teams, auditors, and the broader transparency of U.S. capital markets.

What the SEC Proposed

According to a summary published by accounting advisory firm Cohen & Co., the SEC issued a proposed rule on May 19, 2026, aimed at simplifying financial reporting requirements for many U.S. public companies. The proposal would potentially reduce the frequency of certain mandatory disclosures from quarterly to semiannual, a structural change that has not been made to core U.S. reporting requirements in decades.

The proposal follows an extended debate within U.S. policy circles, with proponents arguing that reduced reporting frequency could lower compliance costs and free up management time for longer-term strategic planning rather than quarter-to-quarter results management.

Why Investors Are Pushing Back

Comment letters submitted in response to the proposal have been extensive, and according to Cohen & Co.’s review of the public record, investors “appear to be largely opposed” to the shift, viewing frequent interim reporting as a core benefit of U.S. capital markets relative to other jurisdictions.

Accounting and law firms have taken a more measured position, generally urging any changes to remain aligned with the Financial Accounting Standards Board (FASB), whose existing disclosure requirements and guidance are built around a quarterly reporting cadence. A shift to semiannual reporting without corresponding changes to FASB guidance could create friction between SEC filing requirements and GAAP-based disclosure expectations.

Lessons From the U.K. Experience

The debate is not without precedent. The United Kingdom moved away from mandatory quarterly reporting for listed companies in 2014, returning to a semiannual disclosure requirement. According to Cohen & Co.’s analysis, that experience offers a cautionary data point: there was no measurable increase in capital expenditure or R&D investment following the change, while analyst coverage of affected companies declined as reliable interim information became less available — a particular risk for smaller and newly public companies that rely on analyst coverage to maintain investor visibility.

Practical Implications for Finance Teams

Beyond the debate over disclosure philosophy, the proposal carries practical complications. Many companies have debt covenants and credit agreements structured around quarterly financial delivery; a shift to semiannual reporting could require renegotiating those terms. Reduced reporting frequency would also extend the “window of market silence” between disclosures, a factor that governance and investor-relations teams would need to manage carefully to avoid information asymmetry.

Separately, and unrelated to the reporting-frequency debate, the SEC and FASB have continued finalizing more routine updates this year. New Accounting Standards Updates are taking effect for December 31, 2026, fiscal year-ends covering income tax disclosures, credit loss measurement, induced debt conversions, and stock compensation, according to Eide Bailly’s review of 2026 ASU activity. Additional guidance on paid-in-kind dividends and environmental credits is also on the near-term horizon.

What to Watch Next

The semiannual reporting proposal remains in the comment and review phase, and no final rule has been adopted as of this writing. Finance leaders should monitor the SEC’s regulatory agenda for further movement, while treating the current quarterly reporting requirement as the operative standard until any final rule is issued and an effective date is set.

Given the extent of investor opposition documented in the comment file, a full shift to mandatory semiannual reporting appears more likely to result in either a scaled-back compromise or continued study rather than swift adoption — though the SEC’s ultimate direction remains uncertain.

 

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Accounting

AI-Driven Automation and Continuous Accounting Frameworks

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The accounting profession is undergoing a fundamental structural transition as enterprise finance departments shift from periodic month-end closes toward automated continuous accounting models. By integrating specialized machine learning algorithms directly into enterprise resource planning (ERP) platforms, chief accounting officers are transforming financial reporting from a retrospective exercise into a real-time operational asset.

The Shift from Periodic Close to Continuous Financial Reporting
Traditional accounting workflows heavily relied on manual data reconciliation, spreadsheet calculations, and multi-week closing cycles at the end of each fiscal period. In contrast, continuous accounting frameworks utilize automated software agents to process, validate, and post transactional data in real time as business activities occur.

Automated bank reconciliation tools cross-reference incoming bank feeds, invoice records, and purchase orders automatically. By resolving transactional variances instantly throughout the month, corporate accounting teams eliminate the traditional workload spikes associated with quarterly and annual closes.

Machine Learning in Audit Trails and Anomaly Detection
Advanced natural language processing (NLP) and machine learning tools are redefining internal audit and financial control environments. Automated systems analyze 100% of general ledger entries, identifying anomalous transactions, duplicate payments, and unauthorized journal entries in real time.

Rather than relying on random statistical sampling, corporate internal auditors can focus their attention on high-risk flags automatically surfaced by algorithmic monitoring platforms. This continuous risk assessment strengthens internal controls over financial reporting (ICFR) and significantly reduces fraud risk.

Evolving Roles for Accounting Professionals
As routine data entry and manual reconciliation tasks become fully automated, the skill set required for accounting professionals is shifting toward data analysis, system design, and strategic business advisory.
– Systems Governance: Accountants are increasingly responsible for monitoring algorithmic accuracy and managing data integration pipelines.
– Business Partnership: Finance professionals leverage real-time financial dashboards to advise operational leaders on margin management and working capital allocation.
– Regulatory Compliance Management: Accounting teams utilize automated platforms to ensure compliance with dynamic tax codes and international accounting standards.

Core Implementation Recommendations
1. Deploy Automated Reconciliation Tools: Integrate continuous transaction processing modules into existing enterprise ERP architectures.
2. Establish Algorithmic Governance Controls: Implement strict internal testing protocols to ensure automated accounting rules comply with GAAP/IFRS standards.
3. Reskill Accounting Teams: Invest in training finance staff on data analytics, workflow automation, and predictive financial modeling.

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Accounting

Global ESG Reporting Standards and Double Materiality Compliance

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Corporate accounting departments face expanding reporting expectations as international sustainability disclosure standards achieve regulatory enforcement across major global jurisdictions. Chief Accounting Officers (CAOs) and corporate controllers are establishing rigorous internal accounting controls to treat Environmental, Social, and Governance (ESG) metrics with the same data precision, auditability, and governance as traditional financial statements.

Regulatory Harmonization Under Global Sustainability Frameworks
The implementation of standardized sustainability reporting frameworks—notably rules established by international sustainability accounting boards—has created unified expectations for public and large private enterprises. Corporations must report standardized metrics covering greenhouse gas emissions (Scope 1, 2, and material Scope 3), energy utilization, workforce demographics, and supply chain governance.

In Europe and other participating international jurisdictions, double materiality principles are mandatory. Under double materiality, organizations must report both how external sustainability risks impact corporate financial performance, and how internal corporate operations affect surrounding environmental and social structures.

Integrating Sustainability Metrics into Core ERP Systems
To provide auditable non-financial data, enterprise organizations are integrating specialized carbon accounting and ESG management platforms directly into core ERP systems. Automated data collectors capture energy utility invoices, logistics fuel consumption metrics, and vendor compliance records in real time.

Establishing automated, traceable data pipelines ensures that non-financial reporting is supported by clear audit trails. This structured approach allows external financial auditors to provide reasonable assurance on sustainability disclosures during annual corporate reporting cycles.

Financial Impacts and Capital Market Disclosure
Accurate ESG reporting directly influences corporate cost of capital and institutional credit ratings. Commercial lenders and institutional asset managers systematically incorporate sustainability metrics into risk pricing models. Companies that demonstrate transparent, verifiable progress in operational energy efficiency and climate risk mitigation benefit from expanded access to green bond markets and lower debt pricing.

Action Steps for Accounting Leadership
1. Implement Double Materiality Frameworks: Conduct comprehensive assessments to identify material financial and operational sustainability metrics.
2. Build Auditable Non-Financial Data Pipelines: Automate ESG data collection within core accounting software to ensure data integrity.
3. Align Sustainability with Annual Financial Filings: Prepare non-financial disclosures concurrently with financial statements to satisfy regulatory audit expectations.

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