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The 5 Fastest-Growing Companies of the Week (September 14, 2026)

ARR
ARR Club Intelligence
|Sep 14, 2026
Executive Summary (BLUF)

Weekly analysis of the fastest-growing SaaS & AI companies based on ARR Club milestones. This week's top performers include Tsenta, Skild, Runway.

Every week, ARR Club's analytics engine processes new revenue milestones to find the fastest-growing SaaS and AI companies in our database. Here is this week's Growth Velocity Leaderboard based on verified ARR milestones published over the past 7 days:

Rank Company Growth Rate (CAGR) ARR Trajectory
#1 Tsenta +6631x
annualized over 1.2 months
$1.2M → $3M
#2 Skild +539%
annualized over 7.8 months
$30M → $100M
#3 Runway +427%
annualized over 5.0 months
$100M → $200M
#4 Harvey +247%
annualized over 2.8 months
$300M → $400M
#5 Zipchat +182%
annualized over 3.3 months
$1.5M → $2M

Note: CAGR (Compound Annual Growth Rate) is computed based on the linear time elapsed between the two most recent revenue milestones. Only companies with verified ARR updates in the past 7 days are considered for this recap.

Methodology

This research report is based on multiple data sources verified by ARR Club. We utilize a combination of official company announcements, public financial filings (S-1s, 10-Ks), verified press reports (TechCrunch, Bloomberg, Forbes), and founder-verified revenue milestones.

Growth rates are calculated using linear annualization between verified milestones. All data points are cross-referenced to ensure maximum accuracy within the constraints of public reporting for private entities.

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