# First Solar Drops ITC Case, Shares Fall

> First Solar's ITC patent case withdrawal triggers 5% stock drop as legal strategy shifts.
- Title: First Solar Drops ITC Case, Shares Fall · Yahoo Finance
- Summary: First Solar's ITC patent case withdrawal triggers 5% stock drop as legal strategy shifts. First Solar dropped its ITC patent complaint, calling it…
- Keywords: first solar, itc, patent, solar, enphase energy, sunrun, nasdaq, trade commission, topcon, district court, stock market, business
- Source: Yahoo Finance — https://finance.yahoo.com/energy/articles/first-solar-retreats-5-dropping-164936130.html
- Published: 2026-09-16T16:49:36+00:00
- Read time: 1 min
- Topics: first solar, itc, patent, solar, enphase energy, sunrun, nasdaq, trade commission, topcon, district court, stock market, business
## First Solar stock drops
First Solar shares fall 5% after withdrawing ITC patent complaint.

> First Solar tumbled 5% after dropping its ITC patent complaint
## ITC case called procedural
General Counsel Jason Dymbort says withdrawal is procedural, not a trade remedy.

> General Counsel Jason Dymbort called the withdrawal procedural
## District court suits continue
First Solar's TOPCon patent litigation moves forward in district court.

> the underlying patent litigation did not end
## Enphase and Sunrun react
Enphase slides 3%, Sunrun holds steady as solar market remains stable.

> Enphase Energy shares are down 3% while Sunrun stock is essentially flat
## TOPCon patent matters
First Solar licenses TOPCon tech through acquisition, not its own product line.

> First Solar manufactures cadmium-telluride thin-film modules and came to own the silicon TOPCon patent through a prior acquisition
## Market reaction
Solar ETFs and broader market show First Solar-specific issue, not sector-wide drop.

> The solar fund close to unchanged and the broad market slightly higher reads as a first solar problem rather than a solar selloff
## What happens next
Investors watch district court outcomes for TOPCon patent enforcement.

> The unresolved question is whether First Solar's district court suits can deliver what the withdrawn ITC case would have delivered
## Key takeaway

First Solar dropped its ITC patent complaint, calling it procedural, causing shares to fall 5% as district court suits advance.