The Current State of the Markets
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How does the New High-Low Index look like on the NYSE?
(New Highs / (New Highs + New Lows)) * 100
The High-Low (H-L) Index on the NYSE provides a raw, unfiltered picture of structural market tops. While Justin Mamis focused heavily on "listening to the tape" for subtle shifts in leadership, the High-Low Index—traditionally calculated as a 10-day moving average of the High-Low Ratio—is the mathematical confirmation of his theories.
When plotted as a smooth index (usually between 0 and 100), it reveals the ultimate battle between the "Generals" and the "Soldiers."
1. The Anatomy of a High-Low Top
In a booming, healthy bull market, the High-Low Index pins itself consistently above 80, and often spikes near 90. This means that out of all the stocks making extreme 52-week moves, the vast majority are expansionary new highs.
When a Mamis-style distribution top forms, the High-Low Index behaves like a leading indicator, executing a highly specific structural breakdown:
The "Subsurface Divergence"
This is the holy grail of top-spotting using this tool. As the broader index makes a spectacular new record high, the High-Low Index fails to confirm it. Instead, it slopes dramatically downward, often slipping below 70.
What it means: Even though the headline index looks invincible, the pool of stocks driving it to new heights has shrunk dramatically.
The Silent Expansion of Lows: More importantly, it reveals that beneath the surface, individual companies have rolled over so severely that they are starting to hit 52-week lows simultaneously while the index hits a 52-week high. On a single-day basis, you will see days where the S&P or Dow is flat to positive, but the absolute number of New Lows on the NYSE starts outnumbering New Highs.
2. Crossing the 50 Line: The "First Break"
In Mamis’s framework, the "First Break" is the moment the market takes a sharp hit, which the complacent crowd assumes is just another healthy buying opportunity.
Quantifying this through the High-Low Index is simple: a decisive drop below the 50 mark.
When the index falls below 50, it means new 52-week lows have officially taken control of the NYSE universe. From a momentum perspective, the internal mechanics of the market have inverted. The "strong hands" have distributed so much supply that the average stock is now breaking down, leaving only a tiny bunker of mega-caps holding the line.
3. The Flawed Rally Signature
After the first break, when the market attempts to claw its way back toward the highs on the back of retail complacency, the High-Low Index provides the final reality check.
If the market rallies but the High-Low Index remains trapped in a low range (say, between 30 and 50), it screams that the bounce is completely artificial. The broad market is refusing to make new highs; it is merely a dead-cat bounce for the averages, heavily manipulated by the index's capitalization-weighted structure.
The Mamis Synthesis: Tracking the High-Low Index completely strips away the emotional noise of the financial media. When the news narrative says "the economy is fundamentally sound" but the NYSE High-Low Index has plunged from 85 down into the 40s, the market is telling you that the foundation has eroded. The distribution process is nearing completion, and the risk of a swift structural break is at its peak.
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How does this indicator currently look like?
When evaluating these tools under the Mamis framework right now, we are seeing a fascinating, textbook demonstration of subsurface fracture and the beginning of the "Generals vs. Soldiers" divergence.
If Justin Mamis were looking at the tape today, he would likely warn that the market is attempting to paint a picture of immense confidence on the surface, while the internal breadth engine is bleeding liquidity.
Here is exactly how the NYSE High-Low Index, the Advance-Decline data, and the McClellan Summation Index look structurally right now:
1. The High-Low Dynamics: The Silent Expansion of Lows
On the major cap-weighted indexes (like the Nasdaq 100 or the S&P 500), heavyweights like Nvidia and select mega-caps have been orchestrating massive, vertical runs to keep the headline prices elevated.
However, if you look at the raw expansion of 52-week highs versus lows, the underlying reality is messy:
The Seduction: Headlines emphasize specific individual leaders breaking out to new records.
The Reality: The broader NYSE universe is experiencing a quiet, rolling correction. On recent down-days, the raw number of daily declining issues has consistently outpaced advancing issues (for instance, a recent session clocked 1,446 declines against just 1,295 advances).
The Indicator State: Because individual non-mega-cap stocks are quietly fracturing and breaking key moving averages, the High-Low Index is showing a classic Mamis bearish divergence. It is failing to confirm the strength of the major indices because the absolute pool of stocks participating in the rally is narrowing dramatically.
2. The McClellan Summation Index: Losing Altitude
The McClellan data provides the definitive proof of institutional distribution underneath the surface.
The Roll-Over: The NYSE McClellan Summation Index has recently turned downward, slipping from its prior highs to sit around the 1567 level.
The Negative Engine: This decline is driven by the daily McClellan Oscillator dropping into negative territory (recently printing -66).
The Mamis Interpretation: Remember, the Summation Index acts as the market's liquid fuel gauge. When the major indices attempt to press forward or hold their ground, but the Summation Index is actively shedding altitude, it means the velocity of buying power has broken. The market is burning massive amounts of energy (churning) just to keep the headline indices flat to slightly positive. The strong hands are feeding stock to a complacent public.
3. The Classic "Generals" Divergence
The most striking evidence of Chapter 13's "What the Market Says" framework is the stark divergence between market leaders and their underlying indices. As noted by breadth experts at the McClellan Financial Publications, we are seeing explicit bearish divergences where mega-cap leaders are pushing higher, but the broader indices and the daily A-D lines are refusing to follow.
This is the exact definition of a market propped up by a shrinking bunker of "Generals." The public looks at the giant tech and growth names and thinks, "The market is safe," entirely blind to the fact that the broader troop count—the mid-caps, cyclicals, and small-caps—has already turned and begun to retreat.
The Takeaway: The current tape is a masterclass in Mamis's distribution. The information environment remains heavily focused on the power of artificial intelligence, strong corporate earnings, and mega-cap dominance.
But the High-Low Index is fracturing, the McClellan Summation Index is losing ground, and the broad universe of individual stocks is fading. The market is speaking the language of a classic distribution top—it is feeling very comfortable to the uncritical observer, precisely because the risk is concentrated right beneath the surface.
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Source
Google Gemini
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Postscript
I don't believe in timing the market but as Howard Marks observed in his book, 'Mastering the Market cycle'..."You can't predict but you can prepare". So this is not about timing the markets, but rather, positioning your portfolio to reflect the underlying cyclic change in the markets. In other words, investors should be thinking more defensively (managing their risk and exposure to stocks) instead of reaching for more profits (reward).