Insights

Tax controversy leadership Kostelanetz LLP is a long-established specialist in high-stakes tax controversies and white-collar defense, with a track record recognized by top rankings. This positions the firm to pursue opportunities with large corporates and financial institutions facing complex tax disputes or government investigations.

Strategic hires Recent partner hires in civil tax disputes and NYC expansion signal ongoing growth and capacity. This suggests readiness for new engagements and potential cross-sell of tax controversy, government investigations, and related litigation services to existing clients and networks.

Global and senior expertise With former senior IRS and DOJ officials among the team and a history of internal investigations, Kostelanetz is well positioned to win matters involving government agencies, audits, and cross-border tax issues, appealing to multinational corporations and high-profile individuals.

Mergers and scale The Welty & Welty merger enhances tax controversy and litigation capabilities, indicating a growing platform. This expansion can be leveraged to approach potential clients seeking integrated tax, litigation, and government affairs services.

Digital presence and outreach The firm utilizes modern tech stack and marketing tools (HubSpot, WordPress, Content Hub, Mailchimp) for client engagement and thought leadership. This enables targeted marketing, content-driven lead generation, and nurture programs to attract prospects in tax and white-collar space.

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Kostelanetz LLP Tech Stack

Kostelanetz LLP uses 8 technology products and services including HubSpot Analytics, Amazon Web Services, HubSpot Content Hub, and more. Explore Kostelanetz LLP's tech stack below.

Kostelanetz LLP's Email Address Formats

Kostelanetz LLP uses at least 2 email formats:
Kostelanetz LLP Email FormatsExamplePercentage
FLast@kflaw.comJDoe@kflaw.com
100%
FLast@kostelanetz.comJDoe@kostelanetz.com
100%

Frequently Asked Questions

What is Kostelanetz LLP's phone number?

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You can contact Kostelanetz LLP'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 Kostelanetz LLP's official website and social media links?

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Kostelanetz LLP's official website is kostelanetz.com and has social profiles on LinkedIn.

How much revenue does Kostelanetz LLP generate?

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As of August 2026, Kostelanetz LLP's annual revenue is estimated to be $25M - $50M.

What is Kostelanetz LLP's NAICS code?

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Kostelanetz LLP's NAICS code is 54111 - Offices of Lawyers.

How many employees does Kostelanetz LLP have currently?

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As of August 2026, Kostelanetz LLP has approximately 78 employees across 1 continents, including North America. Key team members include Partner: M. S., Counsel: U. M. and Paralegal: D. K. Explore Kostelanetz LLP's employee directory with LeadIQ.

What industry does Kostelanetz LLP belong to?

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Kostelanetz LLP operates in the Law Practice industry.

What technology does Kostelanetz LLP use?

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Kostelanetz LLP's tech stack includes HubSpot Analytics, Amazon Web Services, HubSpot Content Hub, WordPress, CookieYes, Mailchimp, Cisco and KnowBe4.

What is Kostelanetz LLP's email format?

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Kostelanetz LLP's email format typically follows the pattern of FLast@kflaw.com. Find more Kostelanetz LLP email formats with LeadIQ.

When was Kostelanetz LLP founded?

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Kostelanetz LLP was founded in 1946.
Kostelanetz LLP logo

Kostelanetz LLP

Law PracticeNew York, United States51-200 Employees

Kostelanetz LLP is a New York City-based law practice with more than seven decades of experience handling high-stakes controversies and negotiations with government agencies. Its core strengths lie in tax controversies and white-collar defense, while it also provides tax and estate planning, commercial litigation, government procurement, and government contracting services. The firm draws on attorneys who have previously held senior roles in the Internal Revenue Service and the Department of Justice, and several lawyers have served as federal judicial law clerks or hold advanced degrees in taxation. Kostelanetz has been recognized in major legal rankings, with partners listed in Best Lawyers and Super Lawyers and the firm named Tax Team of the Year by Chambers USA in 2018. Recent development includes the addition of two partners in 2025, Victor Suthammanont and Melissa Wiley, expanding the New York office.

Section iconCompany Overview

Phone number
NAICS Code
54111 - Offices of Lawyers
Founded
1946
Employees
51-200

Section iconFunding & Financials

  • $25M - $50M

    Kostelanetz LLP's revenue is estimated to be in the range of $25M - $50M

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