How to Read a SPY Options Trading Signal

A SPY options trading signal highlights unusual activity detected in the options market for the SPDR S&P 500 ETF Trust. Astronomer records each signal the moment it fires, so the contract, its timing, and what SPY did afterward are all fixed in a public record rather than reconstructed later.

This guide walks through one real signal from that archive, explains every field it carries, and covers the ways these records are most often misread.

A real SPY signal, field by field

At 10:57 AM Eastern on August 13, 2026, Astronomer recorded a SPY call signal. Here is the whole record, exactly as the archive stored it.

Nothing about this signal is dramatic, which is exactly why it is a useful example. A move of seven hundredths of one percent in the underlying is ordinary for this archive, whose published average peak move is 0.13%. Reading the fields correctly matters far more than the size of any single result.

Two details in that table do most of the work. The strike was $778 while SPY traded at $777.57, so the contract was about forty-three cents out of the money when the activity was flagged. And the expiration was the same day, which means whatever the buyer expected, they expected it within hours.

Call or put

A call signal identifies activity in SPY call options, while a put signal identifies activity in SPY put options.

Call activity is often interpreted as bullish and put activity as bearish, but the label does not reveal any participant's full position or strategy. Calls and puts can both be bought and sold, and either side of a trade may be a hedge against something else entirely.

For that reason a signal is best treated as an observation of options-market activity, not an instruction to enter a trade.

Strike price

The strike is the price at which the option contract can be exercised.

Comparing the strike with SPY's price at detection is what gives it meaning. In the example above, a $778 strike against a $777.57 underlying was slightly out of the money. A strike far above the current price implies a larger move is needed before the contract has intrinsic value; a strike below it is already in the money.

The strike alone does not indicate how strong or reliable a signal is.

Expiration date

The expiration date tells you when the contract expires and how much time remains for SPY to move.

Many SPY signals involve same-day expirations, known as 0DTE contracts. These carry no overnight time for a thesis to play out and lose remaining time value quickly through the session. Always read the expiration together with the direction rather than evaluating the direction by itself.

The SEC's investor bulletin on options covers calls, puts, strikes, and expirations in more depth.

Detection time and SPY price

Astronomer records when a signal was detected along with SPY's price at that moment, creating a timestamped reference point that cannot be improved with hindsight. Times are US Eastern, the market's own clock.

Time of day carries information too. Activity shortly after the opening bell occurs under different liquidity and volatility conditions than activity in the final hour.

What observed movement does and does not measure

This is the field readers get wrong most often, so it is worth stating plainly.

Observed movement measures the price of SPY, the underlying ETF. It is the distance between SPY's price at detection and SPY's price at the recorded close, in the same trading session. In the example, that was $777.57 to $778.14.

It does not measure what an option contract did. An option's value depends on the premium actually paid, implied volatility, time decay, the bid-ask spread, the fill you received, commissions, and fees. None of that is captured here.

The modeled return shown alongside each signal applies a single fixed 110x proxy to the underlying's move. It is a rough illustration of leverage, not a quote, not a fill, and not profit and loss. A real position in that August 13 contract could have returned more, less, or nothing at all.

Five ways these signals get misread

1. Reading a call as a buy instruction. A call signal reports unusual call activity. It does not say the activity was informed, or correct.
2. Treating the modeled return as a result. The modeled figure is derived from the underlying, not from any option price that was quoted or filled.
3. Judging a signal by its strike alone. A strike is only meaningful next to the price at detection and the time left before expiration.
4. Ignoring the expiration. A same-day contract and a monthly contract with the same strike are entirely different propositions.
5. Reading the archive as a trading record. These are detections, not executed positions. No capital was committed, so no fills, slippage, or fees are reflected.

When a signal does not work out

The day before the example above, on August 12, 2026, Astronomer recorded a SPY $773 call at 10:53 AM ET with SPY at $772.45, also expiring that day. By the recorded close one minute later, SPY sat at $772.06.

SPY moved against the signal's direction by about five hundredths of a percent. Under the same 110x proxy, that models to roughly -5.6%.

Signals that do not follow through stay in the public archive alongside the ones that do. Any source of market observations that shows you only the ones that worked is not showing you the record.

Putting the signal together

A SPY options trading signal is best read as a combination of:

1. Direction — call or put activity
2. Strike — the contract's exercise price
3. Expiration — how much time remains
4. Detection time — when the activity was identified
5. Underlying-price context — where SPY traded and how it moved afterward

No single field should be evaluated in isolation. Review the complete record, consider current market conditions, and do your own research before making any trading decision.

Primary references

• SEC investor bulletin on options — calls, puts, strikes, expirations, and the risks involved
• SEC options glossary entry — plain-language definitions
• Cboe Options Institute — options education from the exchange where much of this volume trades

Browse the live SPY options trading signals feed, review SPY call signals or the SPY put signal archive on their own, or read how Astronomer generates its signals.

For educational purposes only. Astronomer signals are observations of market activity, not financial advice or a recommendation to buy or sell any security. Options trading involves substantial risk, including the possible loss of principal. Past performance does not guarantee future results.