INDICATOR EXPLAINER · #07
NAAIM Manager Exposure — what the pros are actually doing
Every Wednesday, the National Association of Active Investment Managers polls its members and asks a simple question: how much equity exposure do you currently hold? The answers reveal what the professionals are doing — not what they're saying.
Today's reading
Same number you'll see on this component's card on the main dashboard.
What is the NAAIM Exposure Index?
NAAIM is the institutional sister to the AAII retail sentiment survey. Where AAII asks retail investors what they think, NAAIM asks professional active investment managers what they've done with their portfolios. Members report their current equity exposure on a −200% to +200% scale (leveraged short to leveraged long).
The NAAIM Number is the aggregate mean across all respondents. It's published every Wednesday, with data going back to July 2006.
Historical distribution (2006–2026)
- Median 72 (managers typically sit ~72% long — structurally bullish)
- 10th pct 32 (unusually cautious)
- 90th pct 94 (heavily long)
- Extreme low ≤ 10 (defensive / rare)
- Extreme high > 100 (leveraged long / rare)
How BATS uses NAAIM
Same direction convention as AAII: low NAAIM → LOW BATS (managers defensive = oversold market state); high NAAIM → HIGH BATS (managers all in = bullish market state). Piecewise linear scoring, centered loosely around the historical median of ~72.
| NAAIM Number | BATS points | Bucket |
|---|---|---|
| ≤ 10 | 5 | Extremely Oversold |
| 10 – 35 | 5 – 25 | Oversold |
| 35 – 60 | 25 – 50 | Slightly Bearish → Neutral |
| 60 – 85 | 50 – 75 | Neutral → Slightly Bullish |
| 85 – 100 | 75 – 90 | Bullish |
| > 100 | 95 | Extended |
Note: NAAIM is a weekly reading. The BATS dashboard carries the most recent one forward until a new one arrives each Wednesday.
Does it work? — Historical backtest (2006–2026)
For every weekly NAAIM reading, we compute the NAAIM component of the BATS and measure how the S&P 500 actually performed 6 and 12 months later. 1,000+ readings across nearly two decades.
What the data actually says
Three findings from the 20-year NAAIM backtest — and one is a genuine surprise:
When pros go defensive, buy.
When NAAIM dropped to 35 or below (professional managers pulling back to defensive positioning), the S&P 500 was up an average of +13.3% over the next 12 months, positive 83% of the time (n=96 readings). At the more extreme ≤10 bucket, +13.6% and 75% positive.
Takeaway: Institutional caution has been a reliable contrarian buy signal — just like retail bearishness in AAII.
Pros ride trends — unlike retail.
When NAAIM went above 100 (managers using leverage on the long side), forward 12-month returns were still +11.9% and 82% positive (n=89). This is the opposite of AAII's Extended bucket, which delivered only +4.5% at retail euphoria.
Takeaway: Institutions ride trends better than retail. High professional exposure is not automatically a warning sign.
Retail + institutional = a fuller picture.
AAII and NAAIM agree on the "buy when defensive" side but disagree on the "sell when euphoric" side. Combined, they give us two independent confirmations of oversold sentiment, and let us distinguish "everyone's bullish" (retail euphoria = warning) from "professionals are long" (trend-following = fine).
Takeaway: Two sentiment surveys from different crowds are much more informative than one.
How to use this information
- Watch the low end. When professional managers drop their exposure below 35, history says the odds strongly favor patient buyers over the next 6–12 months.
- Don't fade the pros just because they're long. Unlike retail, high institutional exposure hasn't historically preceded weak returns. Managers get paid to be right about trends — and often are.
- Compare NAAIM to AAII. When institutions and retail both go defensive at the same time, the contrarian setup is unusually strong. When they disagree, the institutional reading has generally been the more reliable one.
- Weekly cadence — slow updates. NAAIM publishes each Wednesday. The BATS dashboard shows the most recent one and holds it steady between updates.
Reminder: None of this is investment advice. Historical patterns are not guarantees. Always do your own research or talk to a financial professional.