Lookalikes · Data refreshed September 2026

25 Mimecast lookalikes

Compiled by the RevenueBase Data Team Data refreshed Sep 26, 2026 128 matching companies

Looking for Mimecast lookalikes, Mimecast competitors or Mimecast alternatives? The RevenueBase company graph holds 128 companies that do what Mimecast does, matched at 85%+ measured description similarity (RevenueBase, September 2026). The 25 largest are ranked below by team size; across all 128 matches RevenueBase tracks 9,754 professional contacts, including 4,242 with verified work emails.

Similarity is measured on what companies actually do, from their business descriptions rather than industry codes, and is shown per row as a percentage. This page keeps only companies at 85%+ measured similarity to Mimecast and ranks them by company size. Data current as of September 26, 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 Similarity shown on every row Refreshed Sep 26, 2026 Match quality audited by blind human judging

Reference company

Mimecast

“organizations.”

1,001-5,000Employees

2,304Contacts tracked

1,389Verified emails

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The 25 largest Mimecast competitors and alternatives

Ranked by team size

Top 25 of 128 companies matching Mimecast at 85%+ description similarity, ranked by team size. Similarity is each company's measured match to Mimecast (100% = identical). Data refreshed Sep 26, 2026.
#	Company	HQ	Employees	Similarity	Verified emails
1	Knowbe4	Clearwater, US	1,001-5,000	88%	1,453 contacts →
2	Darktrace	Cambridge, GB	1,001-5,000	87%	1,623 contacts →
3	Vectra AI	San Jose, US	501-1,000	86%	439 contacts →
4	Arkose Labs	San Mateo, US	201-500	88%	125 contacts →
5	Cybelangel	Clichy, FR	51-200	87%	103 contacts →
6	Alfa Group	Rome, IT	51-200	86%	90 contacts →
7	Deep Algorithms Solutions	Hyderabad, IN	11-50	87%	25 contacts →
8	Cybsafe	London, GB	51-200	85%	41 contacts →
9	Cyber Evolve	Delhi, IN	11-50	86%	43 contacts →
10	Cognna	n/a	51-200	87%	23 contacts →
11	ZERON	Wilmington, US	11-50	87%	23 contacts →
12	Quilrai	Pune, IN	51-200	86%	21 contacts →
13	Outthink	New York, US	51-200	88%	20 contacts →
14	Living Security	Austin, US	51-200	88%	24 contacts →
15	Anozr WAY	Cesson-Sevigne, FR	11-50	88%	18 contacts →
16	Beyondscale	Hyderabad, IN	11-50	85%	16 contacts →
17	PRE Security	San Jose, US	11-50	86%	15 contacts →
18	Siemba	Alpharetta, US	11-50	86%	17 contacts →
19	Anetac	n/a	11-50	86%	9 contacts →
20	Beamsec	London, GB	11-50	85%	11 contacts →
21	Muttii Technologies	Sydney, AU	51-200	86%	1 contacts →
22	Freeze	Boston, US	11-50	85%	2 contacts →
23	Guardrail Technologies, INC	Park City, US	11-50	86%	6 contacts →
24	Rescana	New York, US	11-50	86%	12 contacts →
25	Echo External Threat Protection	Istanbul, TR	11-50	86%	10 contacts →

Showing the 25 largest of 128 similar companies

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How similarity works

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.
Matching: Companies are matched on what they actually do, as described in their own business descriptions, never on shared industry codes. The list keeps only matches at 85%+ measured similarity to Mimecast, and match quality is audited by blind human judging. Read the full methodology.
Ranking: Team size, largest first, among the matched companies: companies are ordered by the number of professionals RevenueBase tracks at each one. Each row also shows its measured similarity to Mimecast as a percentage.
Verification: Contact records re-verify on a rolling cadence rather than being scraped once and left to decay; each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 26, 2026. Lists refresh periodically as the graph is re-checked.

Frequently asked

What are Mimecast lookalikes?

Mimecast lookalikes are companies that closely resemble what Mimecast does and sells, based on each company's own business description. The table above ranks the closest matches by company size, with each company's similarity to Mimecast shown as a percentage.

What companies are similar to Mimecast?

The largest companies similar to Mimecast are Knowbe4, Darktrace, Vectra AI and Arkose Labs. The table above shows the 25 largest of the 128 matched companies, with each row's similarity shown as a percentage.

How is similarity measured?

Similarity scores how closely a company's business, as described in its own words, matches Mimecast's, shown as a percentage (100% = an identical description). The list keeps companies at 85% or above and ranks them by team size.

How do I get contacts at these companies?

A free RevenueBase account lets you run this exact search and work the top matches, verified emails and direct dials included. Upgrading unlocks the 4,242 verified emails and direct dials tracked across all 128 matched companies.

Who are Mimecast's biggest competitors?

The largest Mimecast competitors by measured business-description similarity are Knowbe4, Darktrace, Vectra AI and Arkose Labs. Every company here does what Mimecast does at 85%+ similarity, ranked by team size.

What are the best Mimecast alternatives?

The closest Mimecast alternatives are the companies whose own business descriptions match Mimecast's most closely, shown above with each one's similarity as a percentage and ranked by team size.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 26, 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.