Is overlap always bad?

No. Overlap can be intentional, but investors should know when it creates accidental concentration beyond their target risk.

What should I check first?

Start with repeated top holdings, sector concentration, and how much this pair changes your effective exposure across the full portfolio.

SPY vs QQQ overlap: how diversified is this pair?

SPY and QQQ are both widely used core ETFs, but they can still produce meaningful overlap in the same mega-cap growth leaders. This page helps investors evaluate when the pair is diversification and when it is concentration by another name.

Quick answer

What to evaluate

1) Shared top holdings

If the same names dominate both ETFs, your portfolio may be less diversified than it appears.

2) Sector footprint

Overlap often appears as sector concentration, especially in technology-heavy market leaders.

3) Role in your full portfolio

Pair-level overlap should be interpreted in the context of all holdings, not in isolation.

Run this pair in the tool

Compare SPY vs QQQ in the ETF Overlap Checker, then run a free risk snapshot for full-portfolio context.