# Spdr S&P Midcap 400 Etf Trust (MDY): who owns it

2 value investors held Spdr S&P Midcap 400 Etf Trust in their Q3 2026 13F, led by Matrix Asset Advisors, Mairs & Power.

## 13F holders

| Manager | Portfolio | Value | Change | Quarters held |
| --- | --- | --- | --- | --- |
| Matrix Asset Advisors | 0.3% | $3.8m | Trimmed -2.3% | 23 |
| Mairs & Power | 0.0% | $561k | Trimmed -2.6% | 2 |

Source: SEC filings, via moatshark (https://www.moatshark.com/s/mdy). Values traded and returns are estimates. Not investment advice. Built 2026-10-21.