Insights

Tax Controversy Expertise Kostelanetz LLP commands a global reputation in tax controversies and white-collar defense, with many partners who have served in senior government roles. This suggests strong demand for sophisticated, tech-enabled dispute resolution, regulatory risk assessment, and investigative support services that can complement their practice.

Growth Signals Recent 2025 partner hires in New York indicate organizational growth and expanded leadership capacity. This growth creates opportunities for cross-sell to enterprise clients and for onboarding or client-success programs that accelerate adoption of ancillary services, such as government contracting and compliance offerings.

Boutique Advantage Its elite rankings and boutique positioning position Kostelanetz as a trusted advisor for sophisticated clients with high-stakes needs. This opens doors for premium advisory services, strategic partnerships, and value-based pricing engagements around complex tax enforcement trends and cross-border matters.

Digital Readiness Headquartered in New York with a mid-size team and a tech-forward stack shows readiness to leverage digital channels and secure data workflows. Opportunities exist to offer marketing automation, client portal enhancements, and cybersecurity/compliance solutions tailored to law firms serving government and corporate clients.

Cross Sell Potential Broad practice areas from tax planning and estate planning to government contracting and commercial litigation enable cross-selling of technology-enabled solutions, such as eDiscovery, matter management, contract lifecycle management, and regulatory compliance programs.

Kostelanetz LLP Tech Stack

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

  • HubSpot Analytics
    Analytics
  • Amazon Web Services
    Cloud Hosting
  • Mailchimp
    Email
  • Goober
    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@kostelanetz.comJDoe@kostelanetz.com
100%
FLast@kflaw.comJDoe@kflaw.com
100%

Frequently Asked Questions

Where is Kostelanetz LLP's headquarters located?

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Kostelanetz LLP's main headquarters is located at 7 World Trade Center 34th Floor New York, New York 10007 United States. The company has employees across 1 continents, including North America.

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.

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 June 2026, Kostelanetz LLP has approximately 77 employees across 1 continents, including North America. Key team members include President Of Welty Pc: T. W.Partner: A. S.Partner: B. S.. 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 ServicesMailchimpGooberAmazon ALBHubSpotCiscoFacebook.

What is Kostelanetz LLP's email format?

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Kostelanetz LLP's email format typically follows the pattern of FLast@kostelanetz.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

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

Headquarters
7 World Trade Center 34th Floor New York, New York 10007 United States
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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