Backtested and hypothetical results, shown for educational purposes only — not investment advice. Past performance does not indicate future results.

Mean Reversion

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US indices SPY QQQ IWM DIA International FXI EEM
AMKR’s daily moves don’t reliably mean-revert. The dip-buy stats below are weak or noisy — at the daily close-to-close horizon this signal works cleanly on the broad equity indices (SPY, QQQ) and mostly breaks down on commodities and crypto.
Expected return · next day

AMKR — No setup$51.73 · 2026-09-11

AMKR follows through on the prior day (trends) at the daily horizon.

Nothing stretched right now — no short-term setup.

Today
+4.4%
last close-to-close
RSI(2)
74.9
neutral
vs 50-day avg
-8.2%
-0.6σ
Streak
1 up
closes in a row
Off 20-day high
-16.9%
pullback depth
Reversal character: after an up day, next day averages +0.22% (51% up); after a down day, -0.01% (48% up). Reversal score -0.23%, 1-day autocorrelation 0.021 — positive = trending.
Growth of $1, close-to-close, since 1998. The two lines are held the day after their trigger and sit in cash otherwise, so they trade a similar number of days — the comparison is the dip-buy leg (green) against its opposite (red), not against buy & hold. No costs or slippage.
Forward return by RSI(2) at the close (toggle mean / median above). Low RSI(2) = short-term oversold. Bar outlined = where AMKR is now.
Forward return by how far price sits from its 50-day average (in standard deviations). Outlined = now.
The next-day return after a run of consecutive up or down closes. A rising staircase toward the “down” end is mean reversion.
Mean-reversion edge by year — the dip-buy leg's next-day return minus its opposite (after a down day vs after an up day, or bottom- vs top-decile RSI(2)). Above zero = the name faded moves that year. Bars are the mean, which a crash can swing hard in either direction (2020); the tick marks are the median — the typical day.
Matched-exposure comparisons — each pair trades a similar number of days, so raw returns are comparable. RSI(2) deciles use thresholds ≤6.1 and ≥94.8.
RuleDays heldAvg / dayWin rate TotalCAGRSharpeMax DD
■ After a DOWN close 3,462 (48%) -0.008% 47.7% -97% -11.8% -0.02 -99.7%
■ After an UP close 3,500 (49%) +0.223% 50.7% +13,252% +18.8% 0.60 -70.7%
■ Bottom 10% RSI(2) 714 (10%) -0.231% 45.5% -92% -8.4% -0.24 -96.3%
■ Top 10% RSI(2) 714 (10%) +0.421% 51.3% +1,074% +9.1% 0.53 -36.6%
How to read this  ▾

Some assets mean-revert at short horizons (a sharp move tends to partly reverse); others trend (a move tends to continue). At the daily close-to-close horizon the reversal shows up cleanly and consistently in the broad equity indices and mostly breaks down elsewhere — commodities, crypto, and individual stocks carry their own momentum. The names above are the ones where it holds up.

RSI(2) is a 2-day momentum oscillator — below ~10 is short-term oversold, above ~90 overbought. Distance from the 50-day average is measured in standard deviations (z-score). Streak counts consecutive up or down closes. For each, we show what happened over the next 1–5 days, historically.

The strategy table pairs each dip-buy rule against its opposite — day-after-a-down-close vs day-after-an-up-close, and the bottom vs top RSI(2) decile. Both legs of a pair are held one day and trade a similar number of days, so raw returns compare fairly (unlike buy & hold, which wins on total return simply by always being invested). Avg / day — mean return on the days the rule is in the market — is the cleanest apples-to-apples number. Frictionless: no commissions or slippage. A character test, not a tradeable system. Past behaviour is not a forecast.

End-of-day adjusted closes, refreshed nightly. 7,135 trading days, 1998-05-01 – 2026-09-11. Backward-looking statistics, not investment advice.