I Investigate the Current Breadth of the Market with Google Gemini
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One of the few market indicators I like to watch is market breadth. that being the case, could you please explain to me the current status of 'the McClellan Summation Index of the NYSE?
The NYSE McClellan Summation Index (NYSI) serves as an intermediate-to-long-term running tally of market breadth.
Core Conceptual Framework
Depending on the charting platform used (e.g., standard vs. ratio-adjusted models), the Summation Index operates around key threshold levels:
Directional Slope: The direction of the Summation Index is often more critical than the absolute raw number. A rising line indicates persistent net accumulation (advancers consistently beating decliners), while a declining line signals distribution.
The Zero / Neutral Mark: Crossing above the zero baseline (or the +1000 level on traditional unadjusted charts) signals a transition into an overall bullish environment, while dipping below indicates negative broader momentum.
Extreme Thresholds:
+1,000 or higher: Signals an overbought condition or extreme breadth expansion.
During major bull thrusts, it can stay elevated above $+1,000$ for extended periods. -1,000 or lower: Indicates an oversold condition.
Readings dropping down toward -1,000 or lower often mark selling exhaustion and potential market bottoms.
Key Mechanics to Watch
Divergences with Major Indices:
Bearish Divergence: If major market averages (like the S&P 500 or Dow) push to new highs while the Summation Index makes a lower high, it indicates that fewer constituent stocks are participating in the rally.
This narrowing market structure is a classic warning sign of an unsustainable top. Bullish Divergence: If indices make a lower low but the Summation Index sets a higher low, it indicates underlying accumulation and improving participation before price turns upward.
Moving Average Crossovers:
Applying a 10-day or 20-day exponential moving average (EMA) directly to the $NYSI helps smooth out short-term noise. When the Summation Index turns up and crosses above its 10-day EMA, it often generates a reliable confirmation signal for medium-term rallies.
Ratio-Adjusted vs. Traditional NYSI:
Because the total number of listed issues on the NYSE changes over decades, many modern data feeds use Tom McClellan’s Ratio-Adjusted Summation Index (RASI). On a RASI chart,
$+500 serves as the key bull/bear dividing line: a move above $+500 signals an active breadth-supported bull trend, while dropping below $+500 indicates deteriorating underlying health.
Sorry, I should have stipulated I want to check in with the ratio-based version of this indicator of the NYSE. What is it telling us at this moment in time?
The Ratio-Adjusted McClellan Summation Index (RASI) normalizes daily net advances ({A - D}{A + D} \times 1000) to smooth out the effect of changing numbers of traded issues over long time horizons.
On a standard RASI chart, +500 serves as the critical "escape velocity" threshold:
Above +500: Confirms that broad-based liquidity and participation are sufficient to support a durable, multi-month bull move.
Rejections / Failures below +500: Signal a lack of broader participation—indicating that an index-level rally is being driven by a narrow group of mega-caps while underlying market breadth deteriorates.
Below 0 (Negative Territory): Reflects sustained net distribution across the broader market.
Current RASI Market Context
The RASI has been displaying a classic bearish breadth divergence relative to major headline indexes.
Failure at Escape Velocity: The RASI attempted a rally earlier in the cycle, reaching +471 before rolling over without crossing the key +500 threshold. It subsequently formed lower lower-high peaks (near the +366 level).
Divergence with Price Highs: While broad indexes (like the Dow and the NYSE Composite) pressed toward new highs, the RASI failed to confirm those moves. This indicates that market gains are being carried by a shrinking pool of large-cap leaders while the average equal-weighted NYSE stock is quietly lagging behind.
Negative Short-Term Momentum: Driven by recent negative daily McClellan Oscillator readings, the underlying Summation Index trajectory remains sloped downward, reflecting a lack of new net liquidity flowing into the broader equity universe.
Key Levels & Confirmation Signals
What Bullish Confirmation Looks Like: For the broad market to clear this liquidity deficit, the RASI needs to turn back up and push decisively above +500.
Until it clears +500, the underlying breadth structure remains vulnerable to retesting lower levels. What Bearish Escalation Looks Like: A breakdown below the zero line on the RASI would shift intermediate market breadth from "narrow/divergent" to outright negative, increasing the risk of a broader index-level correction.
I once read that nothing really bad ever happens when the RASI is above 0. Is the Rasi of the NYSE still above the zero line?
Yes, the NYSE Ratio-Adjusted Summation Index (RASI) is still above the zero line.
While the market's broader breadth structure has cooled off significantly from its high points earlier in the cycle, the RASI remains in positive territory.
However, looking strictly at whether it is above or below zero misses the nuanced warning sign the RASI is currently giving:
The +500 "Escape Velocity" Failure: For Tom McClellan’s RASI, the zero line separates general positive breadth from negative, but +500 is the critical threshold for true "escape velocity".
When the RASI turns down before reaching +500—or forms lower highs below it—it indicates that while the market isn't in outright panic, it lacks the broad-based liquidity to support a healthy, widespread expansion. Current Bearish Divergence: The RASI topped out at +471 and rolled over, subsequently making a lower high around +366.
During this same window, major headline indexes pushed higher, creating a textbook bearish breadth divergence.
Why "Nothing Bad Happens Above Zero" Is a Useful (But Tricky) Rule
The adage that "nothing really catastrophic happens while RASI is above 0" holds true in the sense that major multi-month bear market meltdowns (like 2008 or early 2020) require the RASI to plunge well into negative territory—often down toward
The structural risk, however, is lag:
The RASI is a smoothed, cumulative intermediate-term indicator.
By the time it actually crosses down through the zero line, a correction is already well underway. A failing RASI that stalls out below +500 while remaining above zero is often the precursor phase—it signals that the rally's "engine" is down to just a handful of heavyweights (mega-caps), making the broad index vulnerable if those few leaders finally stall.
As long as the RASI stays above 0, the overall market retains a baseline buffer, but its inability to clear +500 warns that underlying liquidity is thinning out behind the scenes.
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Could you please give me the current status of the RASI of the NASDAQ?
The NASDAQ Ratio-Adjusted Summation Index (NASI) presents a noticeably different structural setup than its NYSE counterpart (NYSI), owing to the unique construction and long-term quirks of the tech-heavy exchange.
Key Mechanics of the NASDAQ RASI (NASI)
Structural "Downward Bias" Constraint:
Because NASDAQ listing requirements are less stringent than the NYSE's, the exchange sees a far higher volume of speculative micro-caps, penny stocks, and unpromising initial public offerings.
Over time, these weaker components quietly bleed out, creating a permanent structural downward bias on the NASDAQ Advance-Decline line and its RASI. The Takeaway: The NASDAQ RASI sits below zero far more frequently than the NYSE version without necessarily signaling an imminent index crash.
The +500 Escape Velocity Limit:
While the +500 mark serves as Tom McClellan’s threshold for the NYSE, the entire NASDAQ universe rarely clears +500 except during massive, explosive bull surges.
Many technical analysts instead focus on: The NASDAQ 100 Summation Index (NDX): Because the NDX tracks a fixed set of ~100 mega-cap/large-cap issues, analysts use +50 as the "escape velocity" signal for tech leaders.
The Zero-Line Crossover: On the full NASI, crossing above zero is a reliable sign that broad tech participation is genuinely healthy.
Current $NASI Status & Technical Reality
Persistent Breadth Deficit: Driven by the rotation out of spec-tech and mixed performance across broader semiconductor and mid-cap tech stocks, the $NASI has struggled to establish an extended move into deep positive territory.
Extreme Concentration Distortion: The headline indexes (like the Nasdaq-100) have been repeatedly propped up by a very narrow cluster of mega-cap tech leaders.
Underneath the surface, the broader pool of NASDAQ-listed stocks has experienced lackluster participation, keeping the NASI suppressed near its baseline/lower range. Moving Average Trend: The 10-day and 20-day smoothed direction on the NASI remains weak. Without a sustained series of high net-advancer days ({A - D}{A + D}), the index cannot build the cumulative momentum needed to stage a structural breadth breakout.
