Top 10 Dealer Groups by Rooftop Count in 2026

Scale is the defining force in auto retail. The top 10 dealer groups in America control thousands of rooftops, tens of billions in annual revenue, and the kind of vendor negotiating leverage that shapes the entire automotive technology market.

Who are they? Where are they headquartered? And what can we learn from their technology choices — or the lack of visible technology choices?

We pulled the numbers from The State of Automotive's DealerGroupTechStack database, which tracks 219 franchise dealer groups across the country. Here's the definitive ranking.

The Top 10 by Rooftop Count

Lithia & Driveway leads the pack at 459 rooftops — nearly 100 more than second-place Penske at 369. That gap represents years of aggressive acquisition strategy. Group 1, AutoNation, and JM Family round out the top five, each north of 150 rooftops.

The geographic spread is notable: three groups call Texas home (Group 1, Berkshire Hathaway, Ken Garff is Utah-based), two are in Charlotte, NC (Sonic and Hendrick), and the rest are scattered from Oregon to Florida.

The Public-Private Tech Stack Divide

Here's the most striking finding in our data: the top 8 groups — Lithia through Hendrick — have exactly zero tech stack entries in The State of Automotive's DealerGroupTechStack database.

That's not a data gap. It's a structural fact about how publicly traded dealer groups operate.

When you're a public company running 127 to 459 rooftops, you don't fill out vendor surveys. You don't list your CRM on your careers page. You negotiate enterprise agreements directly with CDK, Reynolds, Cox Automotive, and every other major vendor — often involving seven-figure annual commitments, co-development arrangements, and custom integrations that look nothing like the off-the-shelf product a 15-rooftop group buys.

Lithia, for example, has invested heavily in its proprietary Driveway digital retailing platform. Penske operates Penske Digital, its in-house technology division. AutoNation built AutoNation Express. These groups don't just buy vendor products — they build their own and negotiate customized versions of everyone else's.

This is the public-private divide in auto retail technology. The top 8 groups operate in a different vendor reality than the mid-market groups that follow them. Their tech stacks are enterprise-scale, often bespoke, and fundamentally opaque to outside tracking.

The Mid-Market Groups: Where the Data Lives

For groups #9 through #15 and beyond, the tech stack picture comes into focus. These are large private groups — significant players, but not publicly traded — and their technology choices reveal clear patterns.

#9: Berkshire Hathaway Automotive (78 rooftops, Irving, TX)

Berkshire Hathaway Automotive, the dealership arm of Warren Buffett's conglomerate, operates 78 rooftops but shows no tech stack data in our database. Like the publics, Berkshire Hathaway's scale and corporate structure likely mean enterprise-level vendor relationships that aren't publicly documented.

#10: Ken Garff Automotive Group (65 rooftops, Salt Lake City, UT)

Ken Garff appears in the tech stack data with CDK as its DMS. CDK is the dominant DMS choice across the mid-market, and Ken Garff fits that pattern.

Honorable Mentions: Groups #11–#15

Larry H. Miller Dealerships (60 rooftops, Murray, UT) — Another Utah-based group with 60 rooftops. No DMS data recorded, suggesting private enterprise arrangements similar to the publics.

Ganley Auto Group (60 rooftops, Broadview Heights, OH) — Matching Larry H. Miller at 60 rooftops, Ganley is one of the largest groups in the Midwest. Tech stack data is limited.

Herb Chambers Companies (58 rooftops, Boston, MA) — The Boston-based group appears with both CDK and Reynolds in its tech stack. A dual-DMS environment is common in groups that have grown through acquisition, where legacy stores keep their existing DMS and new acquisitions bring different platforms.

Morgan Automotive Group (45 rooftops, Pompano Beach, FL) — One of the most interesting tech stacks in the database. Morgan Automotive shows CDK + Reynolds for DMS and DealerOn + Dealer.com for websites. That's four major platforms across two categories — a clear signal of acquisition-driven growth where platform consolidation hasn't caught up with rooftop expansion.

Ourisman Automotive (38 rooftops, Bethesda, MD) — Similar to Morgan Automotive, Ourisman runs CDK for DMS and both DealerOn + Dealer.com for websites. The dual-website pattern appears across multiple large groups.

CDK's Iron Grip on the Mid-Market DMS

Across the 87 unique groups in our database with DMS data, the pattern is unmistakable:

CDK dominates the DMS category with 66 of 87 groups. Reynolds is a strong second at 40 groups, and Cox's Dealertrack barely registers at 1 group.

This CDK-Reynolds duopoly is the single most entrenched vendor relationship in automotive retail. Switching DMS providers is famously painful — it's the operational equivalent of a heart transplant for a dealership. That stickiness explains why both CDK and Reynolds maintain such strong positions, and why even the largest groups often run both simultaneously rather than attempting full migration.

Website and CRM Patterns in the Mid-Market

For the groups that do appear in our tech stack data, the website and CRM choices follow clear patterns:

Websites: DealerOn leads. Of 95 groups with website data, 57 use DealerOn (60.0%) versus 38 on Dealer.com (40.0%). The mid-market has voted — and DealerOn won the website category.

CRM: VinSolutions leads, but DealerSocket is close. VinSolutions has 38 groups (37.6% of CRM entries), DealerSocket CRM has 30 (29.7%), and CDK's eLead has 18 (17.8%).

These numbers reinforce the pattern: mid-market groups evaluate platforms independently rather than defaulting to a single-vendor ecosystem. The most common combination is DealerOn for websites paired with VinSolutions for CRM — a cross-vendor stack that prioritizes best-of-breed over ecosystem integration.

The Top 15: Full Ranking

What This Means for Dealers and Vendors

If you're a dealership operator, the top 10 ranking tells you three things:

First, scale creates a different vendor reality. The publics negotiate deals you can't access. But their choices shape the vendor landscape — what CDK, Reynolds, and Cox build for Lithia and AutoNation eventually trickles down to the mid-market. Pay attention to what the big groups are adopting, because it often signals where the market is heading.

Second, the mid-market is where competition lives. The 15-to-80-rooftop groups that dominate our tech stack data show a competitive, multi-vendor landscape. CDK and Reynolds split the DMS market. DealerOn and Dealer.com compete for websites. VinSolutions, DealerSocket, and eLead fight over CRM. If you're a vendor, this is where you win or lose market share.

Third, acquisition-driven tech stacks are messy and that's normal. Morgan Automotive runs four major platforms across two categories. Herb Chambers runs CDK and Reynolds simultaneously. The idea of a clean, single-vendor tech stack is a fantasy for any group that grows through acquisition. The operational question isn't whether your stack is clean — it's whether you've built the integration layer that makes a mixed stack functional.

The State of Automotive's DealerGroupTechStack database tracks these patterns across 219 dealer groups. The top 10 by rooftops is a list dominated by public companies whose technology choices are opaque by design. But the groups that follow them — the private, mid-market powerhouses — show clear patterns that anyone in automotive retail should understand.

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Data sourced from The State of Automotive's DealerGroupTechStack database, tracking 219 franchise dealer groups and 402 technology stack entries as of June 2026.