Thomas A. South is President & VP at NORTHERN TRUST CORP (NTRS). They have made 7 open-market trades across 1 company since 2019, most recently 2026-08-24.
CIK 0001751051
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 7 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| NTRS | 92,917 | $16.5M |
Shares reported on the most recent Form 4, priced at the 2026-08-25 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| NTRS | SELL | 2026-08-24 | 2026-08-25 | $184.90 | $333K | +0.2% | -6.3% | — |
| NTRS | SELL | 2025-12-11 | 2025-12-15 | $139.03 | $695K | +0.4% | +4.1% | -2.3% |
| NTRS | SELL | 2025-02-19 | 2025-02-20 | $113.00 | $430K | -8.4% | -11.0% | -7.5% |
| NTRS | SELL | 2024-11-07 | 2024-11-08 | $105.80 | $529K | +1.5% | +2.1% | +7.0% |
| NTRS | SELL | 2021-12-09 | 2021-12-10 | $118.22 | $236K | -0.4% | +9.3% | -10.6% |
| NTRS | SELL | 2021-04-26 | 2021-04-28 | $109.65 | $110K | +7.8% | +8.7% | +0.7% |
| NTRS | SELL | 2019-09-13 | 2019-09-16 | $98.54 | $99K | -3.7% | -4.5% | +10.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.