$MRNA just posted a 177% single-day gain—the biggest one-day move by any S&P 500 stock this century.

That's not a typo. Nearly tripled in one session.

For context, even during the wildest pandemic rallies, vaccine makers didn't see moves like this. Something fundamental shifted—likely a major trial result, regulatory win, or partnership announcement.

When a large-cap stock moves like a penny stock, it's usually one of two things: a genuine breakthrough or a short squeeze on top of news. Either way, the options market probably exploded.

If you held calls, congrats. If you were short, condolences.

Historic days like this don't happen often. Worth watching how it trades tomorrow—whether it holds gains or gives some back as profit-taking kicks in.