Insights

High-Value Tax Practice Kostelanetz LLP is a long-established tax controversy and white-collar defense firm with a global reputation and a strong track record, representing an opportunity to position senior-level tax dispute services and strategic investigations to government agencies and large corporations facing complex regulatory scrutiny.

Strategic Growth Recent leadership additions and a merger have expanded the firm’s tax controversy and litigation capabilities, signaling openness to cross-sell opportunities in large clients needing integrated tax and government investigations, as well as potential alliances with financial services firms seeking trusted tax dispute partners.

Government Relations lean Deep government-facing experience from former IRS and DOJ personnel suggests a strong fit for engagements around internal investigations, compliance reviews, and high-stakes regulatory matters, creating cross-sell potential to corporations with complex governance and enforcement risk.

Elite positioning Consistent recognition by Chambers USA, The Legal 500, and other rankings, along with a roster of highly ranked partners, indicates credibility with risk-averse corporate clients and public bodies, making outreach focused on premium engagements and panel-bid opportunities highly viable.

Tech-ready Adoption of cloud and collaboration platforms, along with analytics and public-facing thought leadership, suggests capacity to implement scalable matter management and data-driven defense strategies for larger clients, opening opportunities for tech-enabled compliance programs and expedited due diligence engagements.

Kostelanetz LLP Tech Stack

Kostelanetz LLP uses 8 technology products and services including HubSpot Analytics, Amazon Web Services, Microsoft 365, and more. Explore Kostelanetz LLP's tech stack below.

  • HubSpot Analytics
    Analytics
  • Amazon Web Services
    Cloud Hosting
  • Microsoft 365
    Email
  • Tippy.js
    Javascript Libraries
  • Amazon ALB
    Load Balancers
  • HubSpot
    Marketing Automation
  • Cisco
    Network Hardware
  • Facebook
    Widgets

Kostelanetz LLP's Email Address Formats

Kostelanetz LLP uses at least 2 format(s):
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 July 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 July 2026, Kostelanetz LLP has approximately 77 employees across 1 continents, including North America. Key team members include Partner: M. S.Counsel: U. M.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 AnalyticsAmazon Web ServicesMicrosoft 365Tippy.jsAmazon ALBHubSpotCiscoFacebook.

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

Section iconFunding & Financials

  • $25M - $50M

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

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