Top 10 Firm BDO USA has announced that it is merging in Mississippi-based Top 100 Firm Horne LLP, in a deal that is expected to close Nov. 1.
“I think this deal is No. 95 for us, and it’s going to be the largest expansion in our history,” BDO CEO Wayne Berson told Accounting Today.
The combination will greatly expand BDO’s presence in the Southeast, and give it much greater capabilities in disaster recovery and government services. Once the deal is complete, BDO expects to leverage Horne’s expertise in those areas to create a wholly owned subsidiary, BDO Government Services LLC.
Founded in 1962, Horne has offices in seven states across the Southeast, as well as in Puerto Rico.
“Certainly Florida for us is a very big state, but if you look at Alabama, Mississippi and Louisiana — those states are not really big BDO states,” said Berson. “Once you get across to Texas, obviously that’s big and we wanted to expand there. We saw the opportunity with a lot of the work in the government services sector that Horne does, and they have a tremendous reputation in this sector. We do some work there, but clearly not as much as them and we saw this as an opportunity where — and you’ve heard me say this before — one plus one equals three.”
Terms of the deal were not disclosed, but Ridgeland, Mississippi-based Horne is expected to add 44 partners and over 1,300 employees to the combination. It ranked No. 31 on Accounting Today‘s 2025 list of the Top 100 Firms, while BDO ranked No. 6, with $2.885 billion in revenue, 874 partners, and 12,200 employees.
The merger will be BDO’s first major combination since it announced the formation of its employee stock ownership program in August of 2023. It is the largest accounting firm to have adopted the ESOP structure, and one of only a few overall.
“We’ve certainly known Horne for a long time and we’ve admired a lot of what they’ve done and the business that they’ve built,” Berson explained. “But I think what is even more important about Horne is their culture. When we did our ESOP, we said ‘People first, people first, people first’ — and that’s Horne. They fit so well into the BDO culture. It’s two firms thinking the same way.”
Wayne Berson
“We’ve always said that we protect our brand fiercely and we don’t do a deal with everyone,” he added. “It’s got to be the right fit and Horne is definitely the right fit.”
Horne CEO and managing partner Rusty Butcher agreed. “It really just started with a conversation, you know, and there was an instant connection,” he said. “There was an instant recognition of alignment and core values and what we’re trying to accomplish. And from that initial conversation, it just continued until it became clear that this was the right thing for our firm.”
Inside the deal
The two firms began discussions in mid-spring of this year, but Horne had been evaluating a variety of opportunities since 2024.
Rusty Butcher
“When you see what’s going on in the marketplace, I think you’d be foolish not to at least understand what’s going on and test the waters,” Butcher explained. “And so, that’s really what we were doing. Also, we recognize that there’s some significant investments that need to be made as it relates to technology and other things that are happening in our industry.”
The leadership at Horne also saw another advantage to combining with a larger organization.
“The size we are, we felt like, ‘Hey, we’re big enough that we can go it alone,’ but we also feel like … the highest and best use of our partner group is going out and doing what they’re good at, which is serving clients, growing the business, and growing people,” said Butcher. “By joining BDO, we’re able to take away a lot of that administrative burden that we currently face and bolt onto the engine that they’ve already created to accomplish that. And it will allow our teams to go out and do the things that they’re good at.”
Among the options that Horne looked into was private equity.
“Private equity is just everywhere in our industry right now,” said Butcher. “And we did have some conversations with some private equity groups as well as some firms that have taken private equity. We even had some good conversations around trying to understand deal structure, values, and how that works. And we could just never get comfortable that doing a transaction with private equity was consistent with our focus on providing opportunities for our people and making sure that we’re being good stewards of the resources that we have been provided.”
“We just didn’t feel like that was the right answer for us. It just didn’t align with our culture and our values,” he added. “When we began exploring what an ESOP could look like and began talking to Wayne and others at BDO, it was pretty clear to us that that structure did align with our values and who we want to be and how we want to incentivize and reward our team members.”
Berson also highlighted the importance of the employee stock ownership plan to the combination.
“The ESOP played a critical role in this combination,” he said. “This is something I think a lot of people don’t quite understand yet outside of Horne and outside of BDO, for the community at large. And now they’ll see that the ESOP does play a critical role in combinations going forward. The advantages that are created by the ESOP are enabling our ongoing growth and our investment goals. But it’s also creates a differentiated culture in our industry which was an important factor in Horne leadership deciding to join BDO.”
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.
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.
Internal audit departments and corporate risk managers are modernizing internal control frameworks by shifting from periodic sampling techniques to continuous monitoring and machine learning analytics. As operational data volumes increase across enterprise organizations, automated control testing ensures financial integrity, prevents corporate fraud, and streamlines annual audit engagements.
The Limitation of Periodic Audit Sampling
Historically, internal and external auditors evaluated internal controls by reviewing random samples of financial transactions—often analyzing less than five percent of total ledger entries. In complex enterprise environments, periodic sampling methods carry inherent risks of overlooking localized financial misstatements, unauthorized disbursements, or operational control breakdowns.
In 2026, progressive internal audit functions are utilizing automated continuous monitoring platforms that evaluate one hundred percent of financial transactions in real time. Continuous control auditing systems continuously monitor general ledger entries, procurement approvals, and expense reimbursements across all operating subsidiaries.
AI-Powered Fraud Detection and Anomaly Identification
Machine learning models trained on historical corporate financial data excel at identifying subtle transactional anomalies that indicate potential fraud or operational error. Automated systems instantly flag duplicate invoice payments, unapproved vendor creation, unusual journal entry timing, and unauthorized override of authority thresholds.
When an anomaly is detected, the automated auditing platform generates an instant risk alert, allowing internal audit teams to investigate root causes immediately. Early detection prevents minor operational errors from escalating into material weaknesses in financial reporting.
Streamlining External Audit Preparation
Continuous internal control monitoring delivers significant benefits during annual external financial audits. External audit firms can review continuous audit logs and automated control testing documentation, reducing the time required for manual field testing.
This integrated approach lowers overall audit compliance fees, reduces administrative burdens on corporate accounting staff, and provides senior management and audit committees with real-time visibility into the organization’s overall risk profile.
Core Implementation Guidelines
1. Transition to 100% Data Testing: Replace legacy sampling methods with automated continuous audit monitoring systems.
2. Deploy Anomaly Detection Algorithms: Implement machine learning models to identify unauthorized transactions and operational control overrides.
3. Align Internal and External Audit Workflows: Coordinate continuous control testing protocols with external auditors to optimize annual compliance cycles.