Percentage Price Oscillator

Momentum

What it measures

PPO is MACD expressed as a percentage rather than an absolute price difference — it's the difference between a fast and slow EMA, divided by the slow EMA. This normalization is the entire point: MACD's raw value depends on the security's price level, so a $500 stock and a $5 stock produce wildly different MACD scales even with identical percentage moves. PPO fixes that, making it directly comparable across different securities.

How readings are interpreted

Interpreted exactly like MACD — a PPO line crossing above its signal line is bullish, crossing below is bearish, and the histogram shows the gap between them. The key difference is that PPO values can be meaningfully compared between AAPL and a $2 penny stock, where the equivalent MACD values could not.

Conventional levels

PPO crosses above signal line: bullish crossover
PPO crosses below signal line: bearish crossover
PPO crosses above zero: short-term EMA above long-term EMA, confirming an uptrend
Because it's a percentage, PPO readings can be ranked/sorted across a whole watchlist to find the strongest momentum — something raw MACD values cannot do reliably

Where it works, and where it does not

Works best in trending markets, same as MACD — in sideways/choppy conditions expect frequent false crossovers. The main use case where PPO earns its place over MACD is any cross-security comparison: screening, ranking, or watchlist work.

Commonly read alongside

MACD: Same underlying signal, so they'll agree directionally — use PPO specifically when comparing momentum strength across different-priced tickers
ADX: PPO crossovers are more reliable when ADX confirms a trending market
Volume: A PPO crossover on rising volume is a stronger signal than the crossover alone

Known limitations

Same lag and false-signal issues as MACD in ranging markets, since it's the same underlying calculation
Adds no new information beyond MACD for single-ticker analysis — its value is specifically in cross-ticker comparability
Because it's less commonly displayed than MACD by default on most platforms, fewer traders are watching the same levels, reducing self-fulfilling-signal effects

In practice

Prefer PPO over MACD specifically when screening or ranking momentum across multiple tickers
For single-ticker analysis, MACD and PPO will tell you the same story — no need to use both
Use the same crossover and zero-line rules you'd apply to MACD
Particularly useful for building a "strongest momentum in the universe" ranked screener view

Plot it yourself. Add this indicator to a chart, change every parameter and watch the line move, then backtest how the rule would have behaved on historical data — free on the S&P 500 ETF, no card.

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This is reference material, not advice. It describes what each indicator measures and how its readings are conventionally interpreted. Nothing here is a recommendation to buy or sell anything, and no indicator predicts future prices. GU Analyser is an analytical tool — no money is ever traded here.