SPY Rebounds on CPI Day, FOMC Week Looms
· 4 min read
Three days in a row, SPY closed lower. Sep 8 at $765.96. Sep 9 down to $762.40. Sep 10 down again to $757.83. QQQ did the same thing — three straight red closes, ending at $708.69 by Sep 10. Nothing dramatic, just the slow bleed that makes you check your account less often, not more.
Then today happened. CPI came out at 8:30am. I don’t know the actual number and I’m not going to pretend I do — but whatever it said, the market liked it enough to reverse three days of selling in one session. SPY opened at $764.72, ran to a high of $766.38, and closed at $764.29, up 0.85% from yesterday. QQQ did the same — opened $715.68, closed $714.88, up 0.87%. Both closed near their highs. That’s not a shaky bounce. That’s a market that got a number and decided the worst was already priced in.
What a resolved event does to premium
Here’s the part that matters if you’re trading options instead of just watching the ticker. Before 8:30am, every SPY and QQQ option had CPI baked into its price. Market makers don’t know the number either, so they widen the range of possible outcomes and charge more for it. That’s why premium looks expensive the morning of a data print — not because anyone thinks the move will be huge, but because nobody can rule out that it will be.
Once the number prints and the market reacts, that uncertainty is gone. The event is resolved. This is different from a surprise-driven crush, where a shock number causes one violent move and then implied vol falls off a cliff as everyone repositions in a panic. Today wasn’t that. It was a relief move — a number that didn’t confirm the fear from three losing sessions, so the market unwound some of the caution it had built in. Premium tends to come out of options gradually through a session like that, not all at once, because the unwind is more like an exhale than an air pocket.
If you were holding calls into this morning expecting a specific size of move, you got the direction right and possibly got paid less than you expected, because part of your gain got eaten by vol dropping while price rose. That’s not a bug. That’s just what happens when you buy an option ahead of a scheduled event — you’re paying for the uncertainty, and once it’s gone, so is that portion of the price.
What the losing streak actually taught
The three days into CPI are the more useful lesson than the rebound itself. Watching SPY drop for three straight sessions right before a data print is exactly the environment where position sizing gets tested, because the instinct is to either average down into the losses or go bigger on the print to make it back in one shot. Both of those are sizing decisions dressed up as conviction.
A three-day drawdown into a known catalyst isn’t a signal to change your size. It’s a signal to check whether your size already assumed a catalyst was coming. If a losing streak into CPI put you in a spot where you had to make a decision about your position before you even knew the number, your size was wrong going in — not because you were unlucky, but because you left yourself exposed to a coin flip you had no edge on. The rebound bailed a lot of people out today. It won’t every time.
Why FOMC week is a different animal
CPI is a single 8:30am print. One number, one reaction, done by lunch. The vol structure around it looks like a spike that resolves in hours.
FOMC next week is not that. The meeting runs Tuesday and Wednesday, September 15 and 16, with the rate decision due Wednesday afternoon. That’s a two-day event with a specific release time days out, which means the market has longer to position into it and the vol curve behaves differently — it builds more slowly across both days instead of spiking in one morning, and it doesn’t fully resolve until the statement and the press conference are both out. There’s also more room for a two-stage reaction: one move on the decision itself, a second move once the language gets parsed.
I’m not going to guess what the Fed does. I don’t have an edge on that and neither does anyone posting confident percentages online. What I do know is that treating FOMC week like a bigger version of today’s CPI day is a sizing mistake in the other direction — the exposure window is longer, the resolution is split across two events instead of one, and premium sold or bought going into Tuesday behaves differently than premium tied to a single Wednesday afternoon print.
Where I land on it
Today told me the market still reacts hard to data surprises even after three quiet down days — that’s useful information for how I size going into next week, not a reason to get aggressive off one green session. Alertsify’s calls already have their sizing built around events like this, which is most of why I stopped trying to guess the number myself and just let the account follow the signal.
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