Citadel Reports 5.0% Passive Ownership Stake in First Solar

Executive Summary

On October 15, 2026, Citadel Securities GP LLC, together with affiliated Citadel entities and Kenneth Griffin, filed an initial Schedule 13G disclosing a 5.0% beneficial ownership stake in First Solar, Inc. (NASDAQ: FSLR) as of September 30, 2026.

Stake and Ownership Breakdown

The Schedule 13G was jointly filed pursuant to Rule 13d-1(b) on behalf of several Citadel operating entities and Kenneth Griffin:

• Kenneth Griffin: 5,409,576 shares (5.0%)
• Citadel Securities GP LLC: 5,375,954 shares (5.0%)
• Citadel Securities Group LP: 5,375,954 shares (5.0%)
• Citadel Securities LLC: 4,433,406 shares (4.1%)
• Citadel Advisors LLC / Citadel Advisors Holdings LP / Citadel GP LLC: 33,622 shares (<0.1%)

All shares are reported under shared voting and shared dispositive power, with zero shares held under sole power. The percentage calculation is based on 107,469,788 common shares outstanding as of July 24, 2026.

Filing Context & Significance

• Nature of Filing: Filed under Rule 13d-1(b), confirming that the securities were acquired in the ordinary course of business without the intent or effect of changing or influencing company control.
• Significance: Medium. Crossing the 5% threshold establishes Citadel as a significant institutional holder in First Solar, although the passive classification indicates standard market-making, proprietary, or advisory positioning rather than an activist stance.