Earnings Season: Trading the Post-Earnings EPS Drift

Post-earnings announcement drift (PEAD) is one of the most documented anomalies: after a positive earnings surprise, price tends to keep drifting up for days to weeks; after a negative surprise, it keeps drifting down. The market underreacts. The tradeable edge is in the drift, not the print itself.

The PEAD setup

• Surprise magnitude: EPS beat/miss of at least 5% versus consensus. Smaller surprises are noise.
• Revenue surprise matters more than EPS for sustainability. An EPS beat driven by buybacks or cost cuts, with a revenue miss, drifts less. Require revenue beat ≥ 2% for longs.
• Guidance: the strongest catalyst. Raised guidance with the beat produces the largest drift; in-line guidance after a beat often fades. Cut guidance with a miss accelerates the downside drift.
• Volume on the reaction: the day-after session should trade at least 1.5x the 50-day average. Low-volume reactions signal weak conviction and smaller drift.

Entry timing

• Do not trade pre-print. Earnings binary outcomes are not an edge; they are gambling.
• Enter on the day-after open for liquid large caps, or wait for the first 30 minutes to settle for smaller names. The opening gap often overshoots; a 30-minute wait avoids the worst fills.
• For less liquid names, wait one full session and enter on a break of the reaction day high (long) or low (short). This filters the volatile initial reaction.

Stop and target

• Stop: below the reaction day low (longs) or above the reaction day high (shorts). If price reverses through the initial reaction, the drift thesis is wrong.
• Target: PEAD drift historically runs 5–15 trading days. Exit half at +5% from entry, trail the rest with a 5-day low stop.
• R/R: minimum 2R. The setup is selective; only trade surprises with both magnitude and guidance confirmation.

What kills PEAD trades

• Pre-announced beats: if the stock already ran 15% into the print on leaks or whisper numbers, the drift is priced in. Require the stock to be within 5% of its 20-day pre-earnings average.
• Sector-wide moves: if the whole sector reports well, individual drift is diluted into sector rotation. Trade the sector ETF instead.
• Macro overrides: a surprise beat on a CPI day or Fed day gets drowned by macro flow. Avoid entering PEAD positions within 24 hours of major scheduled macro releases.

Track your PEAD trades by surprise size bucket (5–10%, 10–20%, 20%+) — the larger buckets consistently show stronger drift and higher hit rate.