First Solar

First Solar Rule of 40

The Rule of 40 of First Solar (FSLR) as of Sep 21, 2026 is 54.68 %. In the previous year, Rule of 40 was 59.90 % — a change of -8.71% (lower).

Rule of 40

54.68 %

YoY

-8.71%

Last updated:

Rule of 40 of First Solar is 2026 54.68 % . Rule of 40 of First Solar was 2025 59.90 % . It decreases by -8.71% lower compared to the previous year.

The First Solar Rule of 40 history

  • 3 Years

  • 10 Years

  • 25 Years

  • Max

Rule of 40
Date
Rule of 40
Jan 1, 2018
-21.92 USD
Jan 1, 2019
31.22 USD
Jan 1, 2020
0.23 USD
Jan 1, 2021
27.89 USD
Jan 1, 2022
-11.44 USD
Jan 1, 2023
52.53 USD
Jan 1, 2024
59.90 USD
Jan 1, 2025
54.68 USD
The First Solar Rule of 40 history
YEARRule of 40YoY
54.68 %-8.71%
59.90 %+14.03%
52.53 %-559.14%
-11.44 %-141.02%
27.89 %+12,287.37%
0.23 %-99.28%
31.22 %-242.43%
-21.92 %-399.75%
7.31 %-114.94%
-48.94 %-225.38%
39.03 %—
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First Solar Stock analysis

What does First Solar do? First Solar Inc. is a global company that was founded in 1999 and is based in Tempe, Arizona. The company specializes in the development, manufacturing, and marketing of photovoltaic modules, as well as the planning, construction, and maintenance of photovoltaic power plants. First Solar distinguishes itself from many other solar companies by focusing on the CdTe technology, which offers advantages in terms of cost, energy efficiency, and environmental sustainability compared to conventional silicon-based solar cells. The company's main business areas include the development and sale of photovoltaic modules, as well as the planning, construction, and maintenance of photovoltaic power plants. It operates worldwide, with a focus on the North American, European, and Asian markets. First Solar is one of the most popular companies on Eulerpool.

Frequently Asked Questions about First Solar stock

Rule of 40 of First Solar is 54.68 % in 2026.

On Eulerpool you can find the complete historical development of Rule of 40 First Solar since 2006 – with annual values, charts, and detailed analysis.

The Rule of 40 states that a company's revenue growth rate plus profit margin should exceed 40%. It is widely used to evaluate SaaS and high-growth companies.

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Quality — First Solar

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