Why Mega-Cap Overlap Does Not Mean Two Funds Are Clones
Many institutional portfolios share the same famous names. That does not make them copies. Weight, breadth, and supporting sleeves still matter.
When two funds both own NVIDIA, Microsoft, Apple, and Amazon, many readers jump to the wrong conclusion: these funds are clones. Usually they are not.
Overlap Is Only the Starting Point
The best companies in the market naturally appear in many institutional portfolios. That is normal. The more important question is how heavily those names are weighted and what else surrounds them.
Recent Examples
Our giant-filer breadth comparison shows that JPMorgan, Vanguard, and FMR all own the same leadership cluster, but the top-ten breadth and largest-position weights still differ materially.
How to Use This on 13F Insight
- List the overlapping names.
- Compare their weights, not just their presence.
- Compare top-five and top-ten concentration.
- Check the supporting sleeves beyond the obvious mega-caps.
Common Misconceptions
- Mistake: Same top holdings means same fund. Reality: The same names can sit inside very different structures.
- Mistake: Overlap means no information. Reality: Weight differences still reveal a lot.
- Mistake: Only unique names matter. Reality: Shared names can still convey very different conviction levels.
FAQ
What makes two funds true clones?
Not just shared names, but very similar weights, concentration, and supporting exposures.
Why do so many funds share the same mega-cap leaders?
Because those companies dominate indexes, market capitalization, and institutional ownership.
What should I compare first?
Largest-position weight and top-ten breadth.
Related Research
Explore all researchCalPERS used Q4 2025 to keep broad-market exposure high through VOO while still adding to Nvidia, Microsoft, Alphabet and Broadcom. The next filing will show whether the pension giant keeps that simple beta-heavy structure or rotates again.
Apr 17, 2026
Fisher’s Q4 2025 filing was still packed with mega-cap tech, but the bigger tell was a giant Treasury and investment-grade corporate bond sleeve built through IEF and VCIT. The next filing will show whether that duration bet was tactical or structural.
Apr 17, 2026
Victory Capital kept mega-cap tech on top in Q4 2025, but the sharper signal was in the secondary moves: large increases in Netflix, Constellation Energy, TSMC and new positions like IQVIA. The next filing will show whether that diversification continues.
Apr 17, 2026
AllianceBernstein kept Nvidia, Microsoft and Amazon on top in Q4 2025, but new exposure to Intuitive Surgical and aggressive increases in Netflix and ServiceNow made the next filing more interesting than another mega-cap recap. Here is what to watch.
Apr 17, 2026
Berkshire ended Q4 2025 with a $274.16B U.S. equity portfolio, steady Apple and American Express stakes, and a fresh set of Verisign, Liberty and New York Times positions. The next filing will show whether those adds were the start of a new sleeve or just tactical cleanup.
Apr 17, 2026