Why Being a $5M-$15M Firm Is the New Sweet Spot

The accounting profession is in the middle of a massive reset. Consolidation, fueled by M&A, private equity (PE), and new capital models, is reshaping the market and shrinking the number of independent local firms. And the firms disappearing fastest are those in the $5M-$15M range with 20-50 team members.

Ironically, this is the exact segment acquirers now want most.

Often labeled “platform firms,” these mid-sized practices are the ones with the most structure, flexibility, and scalability to make them ideal launchpads for future growth.

But the advantages of reaching the $5M-$15M tier extend far beyond M&A.

For accounting firms focused on talent, client experience, innovation, or long-term independence, this size band is becoming a strategic sweet spot.

Fewer firms of this size in the market today means less competition, a big opportunity to attract clients that require a full-service practice but who balk at the idea of partnering with a mega-firm or one being guided by PE.

The $5M-$15M firm also offers the opportunity to be independent for longer.

Here are six reasons I believe the $5M-$15M tier is the most powerful, valuable size to be right now—whether you are looking to be acquired, looking to merge, or simply looking to be the strongest independent practice in your market.

1. A Real Management Layer

A firm in this range can support a true operational backbone with roles such as firm administrator, controller, HR lead, marketing manager, and technology director.

This level of infrastructure strengthens recruiting and retention; frees professionals from administrative drag; supports a culture built on development, mentorship, and meaningful work; and makes the firm more scalable and resilient.

With a leadership team beyond only the partner level, the firm can grow with less friction and chaos and can adapt to change without losing momentum. Firms in this range can also diversify their partner group to include operational experts such as a COO, CKO, and other leaders not licensed as CPAs.

2. Deeper Knowledge, Stronger Specialization

Mid-sized firms can invest (internally or externally) in niche practices that increase their appeal to talent, clients and investors alike. It fuels higher profitability, more efficient workflows, stronger marketing differentiation, and better client satisfaction.

Specialization becomes the difference between being a generalist firm and being a holistic resource and trusted advisor, able to anticipate client needs and proactively add services.

3. Talent Advantage and Professional Leverage

In today’s talent market, $5M-$15M firms stand out to job seekers and recruiters alike.

They offer clear career paths, competitive compensation, a comfortable and progressive culture, and a stronger leadership structure that offers stability without the bureaucracy that can come from a mega-firm.

At a time when PE-backed firms are centralizing their recruiting practices, independent recruiters are often “frozen out.” They increasingly turn to independent, mid-sized firms to maintain their pipelines—and find the best placements for top talent.

Plus, firms of $5M-$15M often qualify for exclusive CPA association memberships that can unlock training, benchmarking, and broader networks that smaller firms can’t access.

4. Service Expansion and Ownership Models

At the $5M-$15M sweet spot, firms reach the critical mass needed to diversify without diluting their brand. They can confidently expand into other areas, including forensics and litigation support, due diligence, wealth management, technology enablement, valuation, CAS, and automation-driven services.

They also gain the flexibility to rethink firm ownership—and leave some of the more traditional models in the past. Now, specialists in nontraditional areas can become equity partners, which drives accountability, retention, and long-term value.

What’s more, this new wave of alternative ownership models closely resembles those being developed and touted by PE and other nontraditional buyers, which makes them a more appealing target for acquisition.

5. Ideal Client Mix

For many closely held businesses, mid-sized firms hit the “just right” zone. They are big enough to handle complexity, small enough to stay personal, structured enough to deliver consistency, and nimble enough to avoid mega‑firm bureaucracy.

As large firms consolidate, clients who feel lost in the shuffle often make a move to firms in the $5M-$15M range. This creates opportunities to upgrade the client base, take on more sophisticated work, and let go of legacy or unprofitable accounts.

The result is a healthier, more strategic book of business.

6. Ownership That Matters

In a 25- to 50-person firm, partners still shape the culture, strategy, and future of the business. Their decisions matter. Their ideas move. Their impact is visible.

Contrast that with mega‑firms, where decision-making is diluted and there is diminished autonomy. Owner influence is limited. The culture becomes “corporate.”

For leaders who value independence, legacy, and meaningful control—which, in my experience, is a vast majority of firm leaders—the mid-sized model delivers what large firms can’t.

A Stable, Future‑Ready Position

The accounting firm consolidation wave isn’t slowing down. And that means the $5M-$15M tier has not become a mid-sized plateau; it stands out as a model to achieve and a launchpad for a stronger future as a sought-after independent practice or M&A contender.

Whether your goal as a firm owner is to attract buyers, build a best‑in‑class advisory practice, grow your team, expand your service mix, or strengthen your market position, this size firm offers the scale, flexibility, and staying power to thrive in a rapidly changing profession.

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Ira Rosenbloom is Chief Operating Executive at Optimum Strategies.