Based on Finviz and news research, here are today's top trending stocks and their catalysts: **1. HCW Biologics (HCWB) - +262%** - Strong Q1 2026 earnings: $6.5M revenue (vs $5,065 in Q1 2025) and $3.5M net income - Revenue driven by exclusive worldwide license agreement for HCW11-006 to Trimmune - Stock surged 122.55% in after-hours trading after beating analyst expectations **2. P3 Health Partners (PIII) - +42%** - Significant after-hours surge, though specific catalyst details weren't immediately available in search results **3. Lunai Bioworks (LNAI/RENB) - Mixed movement** - Recent lawsuit filed against "naked" short-sellers (May 11-12, 2026) - $20M preferred issuance for CNS delivery and neurotherapeutic IP acquisition (May 4, 2026) - Reverse stock split approved (1-for-3 to 1-for-30 ratio, May 13, 2026) - Trading around $0.26, down 7.01% on May 15 **Key Context:** These are primarily small-cap biotech/pharmaceutical stocks experiencing high volatility driven by earnings reports, corporate actions, legal developments, and after-hours trading. Note that these are highly speculative penny stocks with extreme volatility.