# IDEX (IEX): value investors who own it | moatshark

2 value investors held IDEX in their Q3 2026 13F, led by Weitz Investment Management, Mairs & Power.

## 13F holders

| Manager | Portfolio | Value | Change | Quarters held |
| --- | --- | --- | --- | --- |
| Weitz Investment Management | 4.0% | $57.3m | Trimmed -4.5% | 26 |
| Mairs & Power | 0.0% | $908k | Unchanged | 16 |

## Directors buying and selling (Form 4, last 12 months)

| Date | Who | Role | Bought or sold | Shares | Value |
| --- | --- | --- | --- | --- | --- |
| 2026-08-12 | Anderson Lisa M | SVP, GC, CAO & Corp Sec | Sold | 385 | $92k |

## Fund holders

| Fund | Manager | Weight | Value | As at |
| --- | --- | --- | --- | --- |
| Weitz Partners III Opportunity Fund | Weitz Investment Management | 4.8% | $15.9m | 2026-06-30 |
| Weitz Large Cap Equity Fund | Weitz Investment Management | 4.0% | $24.7m | 2026-06-30 |
| Weitz Partners Value Fund | Weitz Investment Management | 2.5% | $12.5m | 2026-06-30 |

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