The Truth About Low-Volume Bull Markets — 4 Historical Cases That Disprove the Narrative

"Volume is dead, so this rally is fake."

Scroll your social feed for ten minutes and you'll meet this claim in one form or another. It's true that SPY volume has been running 40–58 million shares per day, noticeably below the past year's average. The problem is the conclusion people draw from that fact. When I actually pulled historical charts and checked, the equation "low volume = weakness signal" is simply wrong.

Textbook Understanding of Volume

Set the baseline first. Volume matters most in two regimes.

First, trend-reversal zones. When a downtrend ends and a rally begins, heavy volume shows up. That volume signals "buyers abandoning the prior trend are clustering here."

Second, breakout zones. Volume accompanying a resistance break confirms authenticity. Quiet breakouts with no volume have a much higher fakeout probability.

Conversely, mid-trend consolidations don't need heavy volume. Positions are already set, and gradual buying drives price. In those phases, it's normal for volume to drift lower — not alarming.

What the Historical Data Actually Shows

Let me walk through the specific periods I verified. I recommend pulling the chart and following along.

1) Early 2025 — Before the Tariff Tantrum

Right before the tariff-related news broke in early 2025, SPY was near all-time highs with very low volume. When the news hit, massive selling followed and volume spiked. Looking back and claiming "low volume was the sell signal" is classic hindsight bias. In the moment, the quiet volume looked like stable accumulation. The actual trigger was an external news catalyst.

2) December 2024 — Post-Election Rally

After Trump's November 2024 election win, the December rally ran on volume of just 32–40 million shares — historically very low. Yet price continued climbing. Volume and direction moved in opposite directions.

3) Full-Year 2024 — One of the Best Bull Markets

Across all of 2024, SPY delivered one of the best bull markets on record. Throughout it, volume was generally low. In rally phases, volume actually drifted lower. That's not an anomaly — it's a normal characteristic of a healthy bull market.

4) Early 2024 — Volume Spike at the Lows

The interesting counter-example shows up at lows. During the early-2024 correction, heavy volume printed near the bottom, and price rallied afterward. Here, the volume pattern worked exactly by the textbook — heavy at inflection points, light mid-trend.

How to Actually Use Volume

The lessons from these cases are clear.

1) Don't make trading decisions on volume alone. Low-volume rallies can be a normal feature of a healthy bull market. It is not a sell signal by itself.

2) Combine it with price levels. If SPY gets rejected at a key level like 697 with volume simultaneously spiking, that's a meaningful reversal signal. Flipping position on low volume alone — without a level context — is undersupported.

3) Check historical context. When volume looks low right now, compare against similar past periods. Watching what similar volume patterns produced with your own eyes is the most reliable basis for conclusions.

4) Volume patterns depend on regime. Volume at breakouts, reversals, and mid-trend each carry different meanings. Don't try to interpret all of them through a single framework.

The Danger of the Social Narrative

Here's my real reason for writing this. Social media keeps recycling the simple claim "low volume = bearish," and despite that claim not matching the actual data, many investors get pulled along.

I took losses over the past few weeks stubbornly betting on the downside. When SPY broke above the 100-day moving average, I should've flipped my view — "OK, the bias is up now" — but social-media bearish narratives had too much weight in my mental model. Admitting it took longer than it should have.

The core of trading is checking the data yourself and reaching conclusions from it. "Someone said so" is not evidence. Pulling historical charts, checking what happened in similar periods, and using that to judge the present — that's the correct workflow.

Risk Acknowledgment

To be clear, low volume isn't always safe. When external shocks hit — geopolitical events, rate policy, major earnings surprises — low-volume rallies can reverse quickly. Thin positioning means fast liquidation.

What's needed is balance in volume interpretation. "Low volume = always sell" is wrong. "Volume is meaningless" is also wrong. Treating volume as part of the context, not the whole is what works in practice.

FAQ

Q: Is the current low SPY volume normal or a warning? A: It matches patterns from similar prior periods (all of 2024, December 2024, etc.) — closer to normal mid-bull low volume than a warning. That said, if SPY gets rejected at a key level like 697 while volume spikes, that combination should be reassessed as a reversal signal.

Q: Which volume indicator is most useful? A: The simplest option is comparing daily volume to a 20–50 day average. A significant spike above average signals something is happening. That beats complex derived indicators like OBV or VPT — it's more intuitive with less noise.

Q: What do I do when the social narrative and the data conflict? A: Trust the data. Social feeds amplify extreme narratives to drive clicks and engagement. Pulling up a chart and checking similar past periods takes ten minutes. Those ten minutes often save your position.