RSI and MFI

Two of the most widely used indicators in all of technical analysis measure the same thing from different angles. RSI looks at price momentum. MFI looks at price momentum weighted by volume. Together, they give you something neither one provides alone: a more complete picture of whether a move is real or about to fail.

RSI: The Relative Strength Index

RSI was developed by J. Welles Wilder in 1978 and it’s been on every serious trader’s screen ever since. The concept is straightforward.

RSI measures the speed and magnitude of recent price changes on a scale from 0 to 100. The standard setting is 14 periods. It compares the average size of up moves to the average size of down moves over that window.

The traditional interpretation:

Now here’s where most beginners get it wrong. Overbought does not mean “sell immediately.” Some of the strongest stocks on the market will ride above RSI 70 for weeks or even months during a powerful uptrend. Tesla spent most of its legendary 2020 run with RSI above 70. If you sold every time it hit overbought, you missed a 700% move.

Overbought means the stock is extended. It means risk is elevated. It means a pullback wouldn’t be surprising. But in a strong trend, overbought can stay overbought for longer than you think.

Oversold is where RSI becomes most useful. When a fundamentally sound stock gets hammered into oversold territory on fear or a broad market selloff, that’s when smart money starts buying. RSI below 30 on a stock with solid fundamentals is a “pay attention” signal.

MFI: The Money Flow Index

MFI is essentially RSI with volume baked in. It uses both price and volume to calculate a money flow score on the same 0 to 100 scale.

The logic is intuitive. If a stock rises on heavy volume, that’s strong buying pressure. Real demand. But if a stock rises on thin volume, that rally might not have much conviction behind it. MFI captures this distinction.

Why does volume matter? Because volume is the one thing on a chart that cannot be faked. A stock’s price can be manipulated with relatively small amounts of capital, especially in smaller names. But sustained high volume means real money is changing hands. Real institutions are placing real bets.

MFI tells you whether the money behind a move is real or whether the price action is hollow.

Using RSI and MFI Together

This is where it gets powerful. RSI and MFI measure related but different things. When they agree, you have a high-confidence signal. When they disagree, you have a warning.

Both oversold (RSI below 30, MFI below 20): The stock is deeply washed out on both price and volume-weighted measures. If the underlying company is solid, this is often a strong contrarian buy signal. The market has thrown the baby out with the bathwater.

RSI oversold but MFI neutral: Price has dropped, but volume isn’t confirming panic selling. The selloff might not be done yet. Buyers aren’t stepping in with conviction.

RSI overbought but MFI declining: Price is still elevated, but the volume-weighted indicator is rolling over. The rally is losing participation. Institutional interest is fading even as the price holds up. This is an early warning that the move is getting tired.

Both overbought (RSI above 70, MFI above 80): The stock is extended on every measure. Not necessarily a sell signal in a strong trend, but it means any new buying here carries elevated risk. The easy money has been made.

Divergence: The Most Powerful Signal

Divergence is when price makes a new high (or low) but the oscillator doesn’t confirm it. This is one of the most reliable reversal warnings in technical analysis.

Bearish divergence: Stock makes a new 52-week high, but RSI makes a lower high than its previous peak. Price is saying “we’re stronger than ever.” Momentum is saying “actually, we’re weaker.” One of them is lying, and it’s usually price.

Think of it like a car accelerating uphill. The speedometer shows 60 mph, but the engine is straining harder to maintain it. Eventually, the hill wins.

Bullish divergence: Stock makes a new low, but RSI makes a higher low. Selling pressure is exhausting itself. Even though price is still declining, the momentum behind each new push lower is weaker. This often precedes a reversal or at least a significant bounce.

MFI divergence adds another layer. If price makes a new high but MFI diverges, it means not only is momentum weakening, but volume-weighted money flow is drying up too. That’s a double warning.

The Insider Buying Convergence

Here’s where all of this connects to what we do at Money Printer Pro.

When a stock is showing RSI and MFI in oversold territory, and then a CEO or CFO files a Form 4 showing a significant open-market purchase, you’ve got what we call a convergence signal.

Think about it. The technical indicators are saying the stock is washed out. Momentum is at extremes. And then someone who knows the company better than any analyst on Wall Street decides to buy shares with their own money. Not stock options. Not restricted stock units. Their own cash.

That’s a C-suite executive looking at a beaten-down stock price and saying “the market is wrong about us.”

RSI and MFI alone are useful tools. Combined with insider buying data, they become something much more interesting: a framework for identifying stocks where the technical setup and fundamental conviction are pointing in the same direction.

That doesn’t guarantee anything. Nothing in markets does. But when the math and the money agree, the odds tilt in your favor. And tilting the odds is all any of us can do.