Insights

Strategic Acquisition Tonneson + Co has joined Plante Moran, signaling a strategic consolidation in the mid-market accounting space. This presents opportunities to offer aligned services such as integration support, change management, unified technology adoption, and cross-sell of advisory, tax, and wealth management offerings to a combined client base.

Scale Potential Post-acquisition, the combined entity gains access to larger network and resources, suggesting upsell potential in advanced technology platforms, analytics, and process automation for higher value clients, as well as geographic and sector expansion opportunities that could benefit service expansion efforts.

Tech Stack Fit Existing tech stack includes Xero, Power Platform, AutoCAD, Docker, Epic, Workday, Azure AI, Siteimprove, and more. This signals opportunities to propose integrated solutions, managed services, and custom automation projects that leverage these tools for efficiency, data insights, and digital transformation.

Growth Signals Revenue range and recent leadership promotions within Plante Moran indicate growth momentum and emphasis on talent development. This creates openings for advisory services around performance benchmarking, governance, and strategic talent initiatives to support scaling teams and client delivery.

Market Positioning As a well-known brand within a large national firm, Plante Moran’s ecosystem may present cross-sell opportunities into industries they already serve, plus potential partnerships with real estate, consulting, and technology clients seeking integrated accounting, tax, and wealth management solutions.

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Tonneson + Co Tech Stack

Tonneson + Co uses 8 technology products and services including Xero, Microsoft Power Platform, AutoCAD, and more. Explore Tonneson + Co's tech stack below.

Media & News

Tonneson + Co's Email Address Formats

Tonneson + Co uses at least 8 email formats:
Tonneson + Co Email FormatsExamplePercentage
First.Last@tonneson.comJohn.Doe@tonneson.com
72%
Last@tonneson.comDoe@tonneson.com
20%
FLast@tonneson.comJDoe@tonneson.com
7%
FirstLast@tonneson.comJohnDoe@tonneson.com
1%
First.Last@plantemoran.comJohn.Doe@plantemoran.com
96%
FirstLast@plantemoran.comJohnDoe@plantemoran.com
2%
First.Middle@plantemoran.comJohn.Michael@plantemoran.com
1%
FLast@plantemoran.comJDoe@plantemoran.com
1%

Frequently Asked Questions

What is Tonneson + Co's phone number?

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You can contact Tonneson + Co's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Tonneson + Co's official website and social media links?

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Tonneson + Co's official website is plantemoran.com and has social profiles on LinkedIn.

How much revenue does Tonneson + Co generate?

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As of August 2026, Tonneson + Co's annual revenue is estimated to be $25M - $50M.

What is Tonneson + Co's SIC code and NAICS code?

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Tonneson + Co's SIC code is 8721 - Accounting, Auditing, and Bookkeeping Services and NAICS code is 5412 - Accounting, Tax Preparation, Bookkeeping, and Payroll Services.

How many employees does Tonneson + Co have currently?

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As of August 2026, Tonneson + Co has approximately 26 employees across 1 continents, including North America. Key team members include Managing Partner: D. T., Managing Director: L. T. and Manager: J. L. Explore Tonneson + Co's employee directory with LeadIQ.

What industry does Tonneson + Co belong to?

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Tonneson + Co operates in the Accounting industry.

What technology does Tonneson + Co use?

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Tonneson + Co's tech stack includes Xero, Microsoft Power Platform, AutoCAD, Docker, Epic Systems, Workday, Azure AI Services and Siteimprove.

What is Tonneson + Co's email format?

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Tonneson + Co's email format typically follows the pattern of First.Last@tonneson.com. Find more Tonneson + Co email formats with LeadIQ.

When was Tonneson + Co founded?

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Tonneson + Co was founded in 1975.
Tonneson + Co logo

Tonneson + Co

AccountingMassachusetts, United States11-50 Employees

Tonneson + Co is a Wakefield, Massachusetts-based accounting practice that joined Plante Moran on July 1, 2025. As part of Plante Moran, the combined firm provides accounting, tax, consulting, and wealth management services to its clients. The integration expands capabilities and geographic reach while preserving the existing client-facing team and approach.

The organization serves clients seeking professional accounting and related advisory services within the broader accounting industry. It operates within a larger network that emphasizes a people-first culture and a commitment to client service.

Section iconCompany Overview

Phone number
SIC Code
8721 - Accounting, Auditing, and Bookkeeping Services
NAICS Code
5412 - Accounting, Tax Preparation, Bookkeeping, and Payroll Services
Founded
1975
Employees
11-50

Section iconFunding & Financials

  • $25M - $50M

    Tonneson + Co's revenue is estimated to be in the range of $25M - $50M

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