Section 2 · Market Mechanics
What is a Catalyst?
The spark that ignites a momentum move — without it, there is no trade.
No catalyst, no trade.
A catalyst is the specific event that causes a sudden change in supply and demand. Without a catalyst, a stock moving 10% is suspicious and likely to reverse. With a strong catalyst — a surprise earnings beat, an FDA drug approval, a short squeeze — that same move has conviction and can run much further. Momentum traders always ask: "What is the catalyst?" before entering any trade.
3 things to know
FDA drug approvals can send biotech stocks up 50–200% in a single session.
Earnings beats with strong guidance are the most common catalyst for large-cap gappers.
Shorts covering (buying to close positions) can turbocharge an already-moving stock.
Dive Deeper
FDA Drug Approval
Sends biotech stocks up 50–200% in a session. The most powerful single-day catalyst in the market — binary outcome, maximum volatility.
Earnings Beat + Guidance Raise
When results AND the future outlook exceed expectations, institutions pile in. The most common catalyst for large-cap momentum gaps.
Short Squeeze Trigger
High short interest + positive catalyst = feedback loop. Shorts covering amplifies every uptick — the move becomes self-reinforcing.
Key vocabulary — tap each card
Practice
Myth
You need to predict the catalyst before it happens to profit from it.
Myth
Any news is a good catalyst for a momentum trade.
Did you know?
Moderna's stock rose 30% on a single day in May 2020 when it released early COVID vaccine data. That's a catalyst-driven momentum trade — news so significant that supply disappeared.