Celsius shares are under pressure as traders react to intensifying competition in the energy-drink aisle after Costco began selling a private-label Kirkland energy drink positioned as a close substitute for Celsius-style offerings. The move revives worries about unit growth, promotional intensity, and potential share loss—especially because Costco is a meaningful channel for energy brands and tends to amplify price competition once it backs a private-label alternative. At the same time, investors are looking ahead to a scheduled lockup release on April 1, 2026 for a portion of the restricted shares issued in the Alani Nu acquisition, which can add perceived supply overhang even if no immediate sale is announced.

Costco’s private-label launches often pressure branded suppliers through lower price points and high-visibility endcaps, and the market is treating the Kirkland launch as a signal that category growth could shift toward value SKUs. For Celsius, the risk is twofold: (1) losing incremental volume at Costco as members trial the cheaper alternative, and (2) broader price compression if competitors respond with heavier promotions across mass and club. Investors are also trying to separate true consumption trends from shipment volatility tied to distributor inventory decisions, a recurring sensitivity for the stock.

A prospectus filing related to the Alani Nu transaction outlines a phased release of restrictions on the 22,451,224 shares issued as stock consideration, with one-third scheduled to be released on April 1, 2026. Even absent a formal secondary offering, the calendar can influence short-term positioning because it raises the probability of selling activity or hedging. With the stock already volatile, the combination of a fresh competitive headline and an approaching lockup step-down is keeping risk appetite muted.