Concept

Breadth Omens

Breadth Omens, also known as Hindenburg Omen, Titanic Syndrome, are Breadth, Sentiment & External Data concepts.

What are Breadth Omens?

Breadth omens are composite warning signals built from market internals, the best known being the Hindenburg Omen and the Titanic Syndrome. Instead of tracking participation continuously the way an advance/decline line does, an omen fires a discrete alarm when several breadth conditions line up at once. The common theme is a split tape: an index trading near its highs while an unusually large number of individual stocks make new 52-week lows at the same time as others make new 52-week highs.

The logic is that a healthy advance is broad. When a rising index is accompanied by an expanding roster of new lows, part of the market is already in its own bear phase, and the index reading is being held up by a shrinking group of leaders. The Hindenburg Omen, developed by Jim Miekka in the 1990s and building on earlier split-market research, formalizes this with a checklist of simultaneous conditions. The Titanic Syndrome, an older and simpler construction introduced by Bill Ohama, flags sessions where new 52-week lows exceed new highs shortly after the index has printed a fresh high.

Traders should know the honest record before acting on either name: it is weak. These signals have appeared before some major declines, which is why they attract headlines, but they fire far more often than crashes occur. Studies and practitioner reviews repeatedly find a high false-positive rate, and the definitions themselves have been revised over the years, which makes the historical hit rate hard to pin down. Most breadth analysts treat an omen as a prompt to inspect participation at the index highs, not as a sell signal in itself.

How it's calculated

There is no single canonical definition; the most widely cited Hindenburg Omen checklist is:

NH_pct = new_52wk_highs / total_issues * 100
NL_pct = new_52wk_lows / total_issues * 100
Condition 1: NH_pct >= 2.2 and NL_pct >= 2.2 on the same day
Condition 2: the index's 10-week moving average is rising
Condition 3: McClellan Oscillator < 0
Condition 4: new_52wk_highs <= 2 * new_52wk_lows
Signal: all conditions true the same day, commonly required to recur within 36 days to confirm
new_52wk_highs: count of issues making new 52-week highs that day
new_52wk_lows: count of issues making new 52-week lows that day
total_issues: number of issues traded on the exchange that day

Thresholds (2.2 percent, originally 2.5 percent in some versions, the 2x cap, the confirmation window) vary by author; some versions drop conditions entirely.

The Titanic Syndrome is simpler: new 52-week lows exceed new highs within about a week of the index setting a 52-week high.

How traders use it

  • As a prompt for deeper breadth work: an omen firing sends analysts to the underlying internals, such as advance/decline data and the share of stocks above their long-term averages, to judge whether participation is genuinely deteriorating.
  • As a risk-posture input rather than a trade signal: some position traders reduce leverage or tighten exit rules for a period after a confirmed omen, accepting that most instances will resolve harmlessly.
  • As one vote inside a composite market-health checklist, where a single omen carries little weight unless corroborated by weakening momentum and credit or volatility signals.
  • Rarely as a standalone short trigger, and for good reason: the false-alarm rate is high enough that shorting every signal has historically been a poor strategy in most backtests.

Breadth omens vs related breadth signals

New Highs/New Lows: The raw ingredient. New-high and new-low counts are continuous data; an omen packages extreme split readings of that data into a binary event with added filter conditions.

Breadth Thrusts: The bullish mirror image: rare episodes of overwhelming upside participation used to signal the start of advances. Thrust signals have a notably stronger documented track record than the bearish omens.

McClellan Oscillator: A smoothed, continuous breadth-momentum gauge. It appears inside the Hindenburg checklist as a filter, but on its own it measures the flow of breadth rather than flagging split-tape events.

Concept family

Breadth, Sentiment & External Data

63 concepts mapped · 63 in the Library

Breadth Omens FAQ

Does the Hindenburg Omen actually predict crashes?

Not reliably. Some large declines were preceded by the signal, but the majority of signals are followed by ordinary or even rising markets. It is better read as a note that participation is split than as a crash forecast.

Who created these signals?

The Hindenburg Omen is generally credited to Jim Miekka, drawing on earlier split-market breadth research. The Titanic Syndrome is credited to Bill Ohama.

Why do published backtests of the omen disagree?

Because the definition is not fixed. Different authors use different thresholds, universes, and confirmation windows, and small changes materially alter the signal count and hit rate.

Should I sell when an omen fires?

Most practitioners say no. Treat it as a reason to check breadth, leadership, and your own exposure, and act only if independent evidence confirms deterioration.

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