The Mag 7 and Institutional Ownership: Has Any Real Rotation Happened?

Heading into 2025, a popular theme was that institutional portfolios had become dangerously concentrated in a handful of mega-cap technology names and that rotation away from them was overdue. Two years of ownership data tells a more nuanced story — one where the headline numbers and the underlying positioning don't always agree.

Every Mag 7 stock has more holders now than two years ago — but so does almost everything else

At the end of Q4 2023, the seven stocks commonly grouped as the Magnificent 7 had the following institutional holder counts. By Q4 2025, every one had grown:

But context matters. The total number of institutional managers filing 13F reports grew from 7,508 in Q4 2023 to 8,728 in Q4 2025 — a 16% increase. That's the baseline. A stock that grew its holder count by 16% or less essentially held steady relative to the expanding universe of filers.

Through that lens, Microsoft (MSFT) at +19% and Apple (AAPL) at +21% barely outpaced the baseline. Nvidia (NVDA) at +43% — or 27 points above baseline — is a genuinely different story. Meta (META) and Tesla (TSLA) both ran roughly double the baseline, suggesting real net adoption rather than mechanical growth.

The weight shift inside the group tells a different story

Holder counts measure breadth — how many managers own a name. Average portfolio weight measures conviction — how much of their portfolio they're putting into it. Over the same two-year window, those two metrics diverged significantly within the Mag 7.

Nvidia nearly doubled its average portfolio weight, from 1.56% to 2.85%. Alphabet (GOOGL) gained nearly half a point. Meanwhile, Apple and Microsoft — still the two most widely held names in the group — both saw their average weight decline. More managers own them, but each manager is putting a smaller share of their portfolio into them.

If rotation means capital leaving the Mag 7 entirely, it hasn't happened. But if it means capital shifting within the group — away from the incumbent large-caps and toward AI infrastructure and search — the weight data suggests that has been underway for two years.

Q4 2025 showed some trimming, not a rotation

Within Q4 2025 specifically, the total filer universe grew 7.2% quarter-over-quarter (8,144 → 8,728). Against that backdrop, two of the seven names saw small declines in holder count. Microsoft dropped by 36 holders — about 0.6% — and Meta lost 83 holders, or 1.7%. Amazon (AMZN) and Apple held roughly steady relative to the baseline. Alphabet gained 3.3% — the largest quarterly jump in the group.

The weight picture in Q4 was similarly mixed. Alphabet's average weight jumped from 1.67% to 2.00% — the biggest single-quarter gain in the group. Microsoft's weight fell from 3.04% to 2.78%, continuing its two-year decline. Nvidia was essentially flat quarter-over-quarter at 2.85%, holding its gains from prior quarters. Small individual quarter moves don't tell a consistent story about where the group is heading.

Portfolio concentration across the market held flat

One way to see whether concentration in a narrow set of names is actually declining is to look at how concentrated the average institutional portfolio has become over time. The average top-10 concentration across all 8,372 active managers in Q4 2025 was 58.3% — meaning the average manager put 58% of their disclosed portfolio into their ten largest positions. That figure was 58.1% in Q4 2024, and 57.7% in both Q2 and Q3 2025. The trend is essentially flat. Whatever rebalancing has happened at the individual portfolio level, it hasn't shifted the aggregate needle on concentration.

Managers with larger AUMs tend to be less concentrated on average — the 3,479 managers with under-50% top-10 concentration held an average of $17.5 billion in assets, compared to $1.3 billion for the most concentrated tier (90–100%). This pattern is consistent: scale tends to push portfolios toward broader diversification.

Notes

Ownership data is drawn from 13F filings for Q4 2023 through Q4 2025. Average portfolio weight is calculated as the mean of (position value ÷ total portfolio value) across all managers holding a given security in a quarter. The total 13F filer count grew from 7,508 to 8,728 over this period, a 16% increase that serves as the baseline for evaluating holder count changes. Historical holder counts and ownership trends are available for every security through individual security pages or the quarterly ownership changes dataset.