In theory, price levels should not matter. Returns (hence profits) depend on changes, not absolutes. A stock at $50 that goes to $55 has done the same thing as a stock at $100 that goes to $110. Modern finance is built on this invariance. Prices are scaled quantities. Levels are irrelevant.

And yet, in practice, they matter a great deal.

The reason is not in the market. It is in the human brain. Humans do not think in returns; they think in comparisons. We anchor. We reference. We evaluate new information relative to salient landmarks. It seems that the most powerful of those landmarks, in markets, is a recent high.

This is the central insight of George and Hwang’s paper on the 52-week high: momentum works not because investors extrapolate returns mechanically, but because price levels serve as reference points against which new information is interpreted.

The authors show that a stock’s nearness to its 52-week high explains a large fraction of traditional momentum profits,  often more than past returns themselves. Stocks close to their highs continue to outperform; stocks far below their highs continue to underperform. This predictive power survives risk adjustment, survives alternative holding periods, and does not reverse in the long run.

What makes this result striking is not just its robustness, but its triviality. The 52-week high is not hidden information. It is printed in newspapers. It is displayed on trading screens. It requires no computation. And yet it outperforms more sophisticated measures of past performance.

This is already a clue that something psychological, not informational, is doing the work.

The key behavioral mechanism is anchoring. Investors do not evaluate news in a vacuum. They ask: How does this compare to where the stock has been? The recent high becomes a reference against which gains and losses are measured.

When a stock approaches its 52-week high, good news feels “already priced in,” even when it is not. Investors hesitate to bid the stock higher. Prices adjust slowly. Momentum follows as information gradually prevails.

When a stock is far below its high, bad news feels excessive. Investors resist selling at what feels like a depressed level. Prices again adjust slowly, and momentum works in the opposite direction.

The important point is that the anchoring is level-dependent, not return-dependent. Two stocks can have identical recent returns but very different positions relative to their highs. The one closer to its reference point behaves differently going forward.

This explains why the 52-week high measure often dominates traditional momentum sorts based on six- or twelve-month returns.

Standard asset pricing models struggle with this result because price levels are not supposed to matter. Preferences are defined over wealth changes, not nominal prices. Rational agents should update beliefs symmetrically regardless of where prices happen to sit relative to past extrema.

But that is not how human cognition works.

Humans are reference-dependent. They evaluate outcomes as gains or losses relative to salient benchmarks. This is not a market failure in the narrow sense; it is a feature of how brains compress information in complex environments. The 52-week high is a particularly strong benchmark because it is recent, visible, and emotionally charged.

The market, in aggregate, inherits this structure.

Another interesting finding in the paper is what does not happen. Momentum based on nearness to the 52-week high does not exhibit the long-term reversals seen in other momentum strategies. Prices do not overshoot and snap back. They drift and then stop.

This matters. It suggests that the phenomenon is not driven by overreaction followed by correction, but by underreaction that is eventually resolved cleanly. Anchoring slows adjustment; it does not destabilize it.

That distinction is often missed in discussions of behavioral finance, where all deviations from efficiency are lumped together. The 52-week high effect looks less like mania and more like friction.

The practical takeaway is not “trade 52-week highs”, that edge is well known and often capacity-limited. The deeper lesson is about how markets process information.

Price levels matter not because they contain information, but because humans demand comparisons. Every new data point is interpreted relative to something else. In markets, that “something else” is often an arbitrary historical reference point.

This has implications far beyond momentum:

• round numbers,
• all-time highs,
• prior peaks,
• breakeven levels,
• strike prices.

None of these should matter in theory. All of them matter in practice.

Disclaimer

This document does not constitute advice or a recommendation or offer to sell or a solicitation to deal in any security or financial product. It is provided for information purposes only and on the understanding that the recipient has sufficient knowledge and experience to be able to understand and make their own evaluation of the proposals and services described herein, any risks associated therewith and any related legal, tax, accounting, or other material considerations. To the extent that the reader has any questions regarding the applicability of any specific issue discussed above to their specific portfolio or situation, prospective investors are encouraged to contact HTAA or consult with the professional advisor of their choosing.

Except where otherwise indicated, the information contained in this article is based on matters as they exist as of the date of preparation of such material and not as of the date of distribution of any future date. Recipients should not rely on this material in making any future investment decision.

“52-week high” means the highest recorded trading price of a security on its primary market during the preceding 52-week period, calculated based on official closing prices or intraday highs as specified by the applicable exchange or data provider.