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Why Concentrated Stock Positions Are A ‘Loser’s Game’

“Antti Petajisto contributed to the literature on the risks of concentrated positions with his June 2023 study, “Underperformance of Concentrated Stock Positions.” His data sample was from CRSP and covered U.S. stocks over the period 1926-2022.”

Read the full article at Financial Advisor Magazine. 

News & Updates

CRSP Count™ Quarterly Update – December 2025

Using CRSP Market Indexes Methodology, CRSP Count™ tracks changes in the number of securities by market cap segments - Mega, Mid, Small and Micro - through time. [...]

CRSP Market Indexes US Market Update – Q4 2025

Notable items with this release include:
- December returns were fairly flat for Cap and Style Indexes
- Value outperformed Growth across the board in Q4, however, [...]

2026 CRSP Market Indexes Methodology Guide

The 2026 CRSP Market Indexes Methodology Guide is now available. [...]

CRSP Market Indexes Breakpoints for Q4 2025

CRSP Market Indexes (CRSPMI) announces the market cap breakpoints and effective ranking dates for its December 2025 quarterly index rebalancing. [...]

What’s New in CRSP’s September Ranking?

We’ve updated our methodology to exclude Passive Foreign Investment Companies (PFICs) from our CRSP Market Indexes—helping mitigate tax implications and improve investor outcomes. [...]

CRSP Mentioned in 1929: Inside the Greatest Crash in Wall Street History – And How It Shattered a Nation

CRSP is pleased to be recognized in Andrew Ross Sorkin’s new book, 1929: Inside the Greatest Crash in Wall Street History – And How It Shattered a Nation. [...]

What does it really mean to be passive in today’s U.S. equity market?

As U.S. equity markets evolve, so should the way they’re measured. In an article published by ETF.com, CRSP explores why traditional, fixed-constituent benchmarks may no longer capture the full dynamics [...]

CRSP Count™ Quarterly Update – September 2025

Using CRSP Market Indexes Methodology, CRSP Count™ tracks changes in the number of securities by market cap segments - Mega, Mid, Small and Micro - through time. [...]

Watch the ETFGI US Summit Panel: Are Index ETFs Still Relevant?

CRSP was proud to join industry leaders at the 6th Annual ETFGI US Summit in New York for a thoughtful discussion on the continued relevance and innovation of index ETFs. [...]
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