Bears Pile In: CBRS and CELH Lead SI Surge

Short sellers made bold moves this week. Cerebras Systems saw the biggest jump among mid-caps. Its short interest rocketed to 30.3% of free float — up 24 percentage points in just seven days. Availability of shares to borrow sits at just 0.6%, making new shorts extremely difficult to open.

Celsius Holdings is also in the crosshairs. SI surged 22% in a week to 18.7% of float. The stock fell even as broader markets rallied on Monday. Bears are growing increasingly bold on the energy drinks brand.

Grindr posted a sharp 10.5pp rise in short interest, now at 22.3% of float. The move came with no major news catalyst — a sign of deliberate positioning rather than reaction.

On the squeeze side, Wolfspeed saw its SI drop 31 points to 88%. That is still extremely high, but the retreat is notable. Cost to borrow stands at 8.4% and availability is zero — a textbook squeeze setup if momentum turns.

Hertz remains a key watch. SI hit 44.6% of float, up nearly 5pp this week, with availability at just 9%. Bears remain firmly in control there.

Social chatter is focused on SpaceX and the Iran deal's oil impact. Indirectly, that keeps pressure on energy-linked shorts and boosts broader risk appetite.