First Solar shares gained approximately 37% during a six-day winning streak.
The rally increased the company’s market capitalization by nearly $8.8 billion.
Stock prices reached an 18-year high during the period.
GLJ Research upgraded the company to a buy rating with a $315 price target.
Investors anticipate a potential announcement regarding Section 232 tariffs on polysilicon imports.
These trade protections are expected to benefit the U.S.-based manufacturer.