signals / MFI cross 80
MFI cross 80 is a short-side study. Fires when the Money Flow Index crosses below 80.
Quiet day for this theme
Today is quiet for MFI cross 80 — no study-grade (n≥10) firings among 30 mega-cap names in the last 5 daily bars. That is today's scan result, not a forecast, and not a LONG/SHORT call. Historical context and other themes that did fire are below — not invented firings for this theme.
Historical context on tracked names
Same rank engine as /t/spy. These are HIST hit rates on the tracked sample, not today's firings. Study-grade rows (n≥10) first; n<10 anecdotes are folded below.
| Symbol | Rule | Win 1mo | Count | Last bar |
|---|---|---|---|---|
| AAPL | MFI cross 80SHORTWin 61.5% · n=13HIST | 61.5%n=13 | 13 | 2026-10-12 |
Anecdotes (n<10) — not headline hit rates
These rows have fewer than 10 measurable 1-month firings. A 100% win on n=1 is not a claim.
| Symbol | Rule | Last date | Win / n |
|---|---|---|---|
| TSLA | MFI cross 80SHORT | 2026-10-12 | Win 40.0% · n=5 |
| MSFT | MFI cross 80SHORT | 2026-10-12 | Win 33.3% · n=9 |
| NVDA | MFI cross 80SHORT | 2026-10-12 | Win 0.0% · n=2 |
| IWM | MFI cross 80SHORT | 2026-10-12 | Win 22.2% · n=9 |
| SPX | MFI cross 80SHORT | 2026-10-12 | Win 20.0% · n=5 |
| SPY | MFI cross 80SHORT | 2026-10-12 | Win 20.0% · n=5 |
| QQQ | MFI cross 80SHORT | 2026-10-12 | Win 12.5% · n=8 |
Themes firing today — Golden cross · MACD bullish · RSI overbought · Death cross.
Rules firing today — EMA 9/21 golden cross · Williams %R cross -80 · CCI cross 100 · CCI cross -100.
Also study — SPY technicals · Most mega-caps closed above SMA200 as of 2026-10-12. · full firing scan.
FAQ
What is MFI cross 80?
MFI cross 80 is a short-side study. Fires when the Money Flow Index crosses below 80.
Which names are firing it?
No study-grade (n≥10) mega-cap firings in the last 5 daily bars. Thin samples (n<10): NVDA.
What is the sample?
Hit rates use the same rank engine as /t/spy on a fixed sample (SPY, SPX, QQQ, IWM, AAPL, MSFT, NVDA, TSLA). 8 of those names have a measurable history for this rule. Windows are 5 days, 1 month and 3 months on daily bars. Last bar in sample: 2026-10-12. Method: /methodology. Caveats: /help.
Why is today quiet for this study?
No study-grade (n≥10) mega-cap firings for MFI cross 80 in the last 5 daily bars. Historical context on tracked names and other rules that did fire are in the quiet-day study pack — not invented firings. See SPY technicals, /breadth, and /firing.
What does MFI cross 80 measure?
Fires when the 14-period Money Flow Index crosses below 80. Underlying math: see How it works on this page. Catalog line: Fires when the Money Flow Index crosses below 80.
What does a firing mean?
A firing is the daily bar where this rule’s condition becomes true (a cross or a flip). It is a study event, not a recommendation to buy or sell. Forward windows on this site are close-to-close with no costs. Study side is short-side (SHORT). A positive forward return is a decline in the close after the print (side-adjusted) — a scoring convention, not a recommendation to sell short. Method: /methodology.
Why can the sample be small?
Hit rates need enough dated prints with a completed forward window. A row with fewer than 10 firings is anecdote, not evidence — the same caveat as /help. Slow rules (especially 50/200 SMA crosses) often have single-digit counts on a two-year tape. We do not invent a hit rate when the count is missing. Names in this sample with a measurable history include AAPL · TSLA · MSFT · IWM.
How it works
Money Flow Index, period 14 — a volume-weighted RSI. Typical price is (high + low + close) / 3; raw money flow is typical price × volume. Positive and negative money-flow sums over 14 bars give the money-flow ratio. MFI = 100 − 100 / (1 + ratio).
Fires when the 14-period Money Flow Index crosses below 80.
Definition comes from the rank-rule catalog and the indicator defaults in this repo. Slug mfi-cross-80 is listed on /api/meta.
How to read it
Study side is short-side (labeled SHORT on firing chips). A positive forward return on this page is a decline in the close after the print (side-adjusted). That is how the event is scored — not a recommendation to sell short. MFI adds volume to an RSI-like ratio. A cross of 20 or 80 is still just a threshold event; a volume spike can shove MFI through the line without a change in trend. If a name has thin volume in the tape, treat the print as noisier, not more informative.
Scoring on this site is shared across every rule (5-day / 1-month / 3-month close-to-close windows, side-adjusted). See How it is scored here below. Names in the tracked sample with a measurable history include AAPL · TSLA · MSFT · IWM. Those figures are the same rows as the hit-rate table below — not a second ranking. Historical hit rates, not a prediction / not trade advice.
When it fails
- Needs a usable volume column; a one-bar volume spike can force a cross.
- MFI can stay extreme in a persistent flow, same as RSI.
- 20 / 80 are conventions shared with the screener zones, not an edge.
- Past ≠ future. A historical hit rate is not a prediction and not investment advice.
- No costs modeled. Forward returns are close-to-close with no commissions, slippage or borrow.
- Small samples. A row with fewer than 10 firings is anecdote, not evidence.
- Overlap bias. Clustered prints can credit the same later move more than once.
Same caveats as the rest of the site: /methodology · /help.
How it is scored here
On this site every rule is scored the same way: run it over about two years of daily bars, record each firing, and measure what the name did 5 days, 1 month and 3 months later. Sell signals are measured as shorts, so a positive return is a profitable short (side-adjusted). The composite score is 0.6 × average return + 0.4 × (win rate − 50), with longer horizons weighted more. Nothing here is a forecast.
Full catalog: /signals. Method: /methodology. Slug mfi-cross-80 is stable and listed on /api/meta.
Same family: MFI cross 20
Firing now (mega-caps, last 5 bars)
| Symbol | Last date | Win 1mo | Count |
|---|---|---|---|
| NVDA | 2026-10-07Win 0.0% · n=2STUDY | 0.0%n=2 | 2 |
Hit rates on tracked names
Same rank engine as /t/spy, /t/nvda, and /t/spx, restricted to this rule.
| Symbol | Win 5d | Win 1mo | Win 3mo | Count | Last bar |
|---|---|---|---|---|---|
| AAPL | 46.2% | 61.5%n=13 | 33.3% | 13 | 2026-10-12 |
| TSLA | 60.0% | 40.0%n=5 | 40.0% | 5 | 2026-10-12 |
| MSFT | 44.4% | 33.3%n=9 | 37.5% | 9 | 2026-10-12 |
| NVDA | 50.0% | 0.0%n=2 | 50.0% | 2 | 2026-10-12 |
| IWM | 44.4% | 22.2%n=9 | 22.2% | 9 | 2026-10-12 |
| SPX | 0.0% | 20.0%n=5 | 20.0% | 5 | 2026-10-12 |
| SPY | 0.0% | 20.0%n=5 | 20.0% | 5 | 2026-10-12 |
| QQQ | 25.0% | 12.5%n=8 | 12.5% | 8 | 2026-10-12 |
Honest caveats
- Past ≠ future. Everything here is a historical measurement on daily bars, not a prediction and not investment advice.
- No costs modeled. Forward returns are close-to-close with no commissions, slippage or borrow.
- Overlap bias. Signals that fire in clusters get credit for the same move more than once.
- Small samples. A row with fewer than 10 firings is anecdote, not evidence.
Full method: help manual. Interactive chart: terminal.