Company lists · Data refreshed September 2026

Top 25 Lead nurturing automation platforms based in the United States

Name: Lead nurturing automation platforms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 1,369 companies tracked

RevenueBase identified 1,369 lead nurturing automation platforms headquartered in the United States as of September 2026 and tracks 26,885 professional contacts across them, including 9,265 with verified work emails. New York is the largest hub.

This list covers lead nurturing automation platforms headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

1,369Companies

26,885Contacts tracked

9,265Verified emails

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The 25 largest lead nurturing automation platforms based in the United States

Ranked by team size

Top 25 of 1,369 lead nurturing automation platforms based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to lead nurturing automation platforms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Klaviyo	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,789 contacts →
	Indirect evidence “Klaviyo (NYSE: KVYO) is the autonomous B2C CRM.” Source: RevenueBase Database · checked Sep 28, 2026
2	BRAZE	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,142 contacts →
	Partial evidence “Braze is the leading customer engagement platform that empowers brands to Be Absolutely Engaging.™ Braze allows any marketer to collect and take action on any amount of data from…” Source: RevenueBase Database · checked Sep 28, 2026
3	Intuit Mailchimp	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,483 contacts →
	Indirect evidence “The Mailchimpossibilities are endless when you create, automate, and optimize your marketing with Mailchimp.” Source: RevenueBase Database · checked Sep 28, 2026
4	6sense	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,443 contacts →
	Indirect evidence “6sense is on a mission to revolutionize the way B2B organizations create revenue by predicting customers most likely to buy and recommending the best course of action to engage…” Source: RevenueBase Database · checked Sep 28, 2026
5	Centro	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	501-1,000	1,178 contacts →
	Partial evidence “Basis Technologies is a global provider of workflow automation, intelligence and programmatic trading software for the marketing enterprise.” Source: RevenueBase Database · checked Sep 28, 2026
6	Cience	Partial evidence	Miami, FL, United StatesHQ checked Sep 28, 2026	201-500	1,068 contacts →
	Partial evidence “CIENCE Technologies, Inc, founded in 2015 and headquartered in Denver, CO, is a pioneering global company in lead generation software and services, committed to transforming the…” Source: RevenueBase Database · checked Sep 28, 2026
7	Activecampaign	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	1,001-5,000	863 contacts →
	Partial evidence “ActiveCampaign is the AI-first autonomous marketing platform built to transform how marketers, agencies, and entrepreneurs work.” Source: RevenueBase Database · checked Sep 28, 2026
8	Adobe Marketo	Partial evidence	San Jose, CA, United StatesHQ checked Sep 28, 2026	1,001-5,000	572 contacts →
	Partial evidence “Adobe Marketo Engage offers the leading Engagement Platform that empowers marketers to build brand value, grow revenue, and prove impact.” Source: RevenueBase Database · checked Sep 28, 2026
9	Callbox INC	Partial evidence	Encino, CA, United StatesHQ checked Sep 28, 2026	201-500	499 contacts →
	Partial evidence “Callbox is the #1 trusted lead generation services and AI-Powered Growth Strategy Partner by enterprise and scaling businesses in the USA, Canada, Asia Pacific, Latin America…” Source: RevenueBase Database · checked Sep 28, 2026
10	Callrail	Strong evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	201-500	332 contacts →
	Strong evidence “CallRail is the lead engagement platform that makes it easy for businesses to attract more leads, convert more customers, and optimize their marketing.” Source: RevenueBase Database · checked Sep 28, 2026
11	Listrak	Strong evidence	Lititz, PA, United StatesHQ checked Sep 28, 2026	201-500	295 contacts →
	Strong evidence “Listrak is the person-first marketing automation platform that seamlessly integrates data, identity, and cross-channel messaging to power hyper-personalized customer experiences.” Source: RevenueBase Database · checked Sep 28, 2026
12	Chili Piper	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	51-200	235 contacts →
	Partial evidence “Chili Piper is the all-in-one Demand Conversion Platform, used by Intuit, Spotify, Airbnb, Gong, and thousands more We are the only platform that consolidates Form Routing, Chat…” Source: RevenueBase Database · checked Sep 28, 2026
13	instantly.ai	Partial evidence	Sheridan, WY, United StatesHQ checked Sep 28, 2026	51-200	215 contacts →
	Partial evidence “All-in-one outreach platform for business growth.” Source: RevenueBase Database · checked Sep 28, 2026
14	Act-On Software	Strong evidence	Portland, OR, United StatesHQ checked Sep 28, 2026	201-500	210 contacts →
	Strong evidence “Act-On Software provides the innovative marketing automation platform for marketers who think big and act boldly.” Source: RevenueBase Database · checked Sep 28, 2026
15	Leandata	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 28, 2026	51-200	194 contacts →
	Indirect evidence “Help your teams align to your customer’s journey by uniting your CRM data, signals, and tools from the first buying signal to closed-won and beyond.” Source: RevenueBase Database · checked Sep 28, 2026
16	KEAP	Partial evidence	Chandler, AZ, United StatesHQ checked Sep 28, 2026	201-500	192 contacts →
	Partial evidence “With Keap, you'll easily capture, organize, track, and nurture all of your leads to increase sales and revenue.” Source: RevenueBase Database · checked Sep 28, 2026
17	Sendpulse	Partial evidence	New York, United StatesHQ checked Sep 28, 2026	51-200	180 contacts →
	Partial evidence “SendPulse is an AI-driven marketing platform that helps scaling businesses automate email and chatbot conversations.” Source: RevenueBase Database · checked Sep 28, 2026
18	Activeprospect	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	201-500	163 contacts →
	Indirect evidence “ActiveProspect empowers marketers to identify and acquire prospects at scale.” Source: RevenueBase Database · checked Sep 28, 2026
19	Rightwave	Partial evidence	San Jose, CA, United StatesHQ checked Sep 28, 2026	51-200	159 contacts →
	Partial evidence “RightWave provides Marketing Automation Services for B2B companies.” Source: RevenueBase Database · checked Sep 28, 2026
20	CLOSE	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	51-200	140 contacts →
	Indirect evidence “Close is the sales CRM built for founders, startups, and small businesses that want to grow faster.” Source: RevenueBase Database · checked Sep 28, 2026
21	Netline	Strong evidence	Newton, MA, United StatesHQ checked Sep 28, 2026	51-200	132 contacts →
	Strong evidence “NetLine is the #1 Programmatic B2B Lead Generation Platform, empowering marketers to engage in-market buyers with targeted content and accelerate revenue growth.” Source: RevenueBase Database · checked Sep 28, 2026
22	CLICK	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 28, 2026	201-500	130 contacts →
	Indirect evidence “Click is the only complete marketing technology solution that is natively integrated with Microsoft Dynamics CRM.” Source: RevenueBase Database · checked Sep 28, 2026
23	Mailerlite	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	122 contacts →
	Indirect evidence “In 2005, we started as a web design agency, but we soon discovered email marketing and fell in love with it.” Source: RevenueBase Database · checked Sep 28, 2026
24	Clientify	Indirect evidence	New York, United StatesHQ checked Sep 28, 2026	51-200	118 contacts →
	Indirect evidence “Stop playing house and start closing deals.” Source: RevenueBase Database · checked Sep 28, 2026
25	Myadvice	Indirect evidence	Lehi, UT, United StatesHQ checked Sep 28, 2026	51-200	117 contacts →
	Indirect evidence “MyAdvice offers an AI-powered growth system that reduces cost and effort while driving revenue and producing valuable insights.” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: lead nurturing automation platforms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names lead nurturing automation platforms.
Partial evidence: Its own public description names part of lead nurturing automation platforms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name lead nurturing automation platforms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,369 lead nurturing automation platforms based in the United States

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Lead nurturing automation platforms based in the United States at a glance

As of Sep 28, 2026

34.5%Verified-email coverage

19.6Average contacts per company

1-10Median size (employees)

5.3%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

789

11-50

422

51-200

112

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,369 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among lead nurturing automation platforms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “lead nurturing automation platforms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names lead nurturing automation platforms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among lead nurturing automation platforms, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 9,265 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Lead nurturing automation platforms by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names lead nurturing automation platforms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many lead nurturing automation platforms are there based in the United States?

RevenueBase identified 1,369 lead nurturing automation platforms headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Klaviyo, headquartered in Boston, tops this list with the largest team on record.

Which city has the most lead nurturing automation platforms?

New York leads with 73 headquartered companies, followed by San Francisco (54) and Austin (44).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 9,265 verified decision-maker contacts tracked across these 1,369 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.