Stephen McMillan is CEO & President at TERADATA CORP /DE/ (TDC). They have made 15 open-market trades across 3 companies since 2006, most recently 2026-09-15.
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 15 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| TDC | 752,446 | $22.8M |
| FFIV | 8,291 | $3.7M |
| LUMN | 76,591 | $357K |
| GFIG | 3,581 | — |
| Total | $26.9M |
Shares reported on the most recent Form 4, priced at the 2026-09-17 close. 1 holding could not be priced and is excluded from the total.
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 |
|---|---|---|---|---|---|---|---|---|
| TDC | SELL · 10b5-1 | 2026-09-15 | 2026-09-17 | $30.02 | $300K | -0.6% | — | — |
| TDC | SELL | 2026-05-12 | 2026-05-13 | $31.71 | $634K | +1.4% | +0.4% | -18.2% |
| TDC | SELL | 2026-02-26 | 2026-02-27 | $30.26 | $1.5M | -10.8% | -19.1% | +3.4% |
| TDC | SELL · 10b5-1 | 2024-11-08 | 2024-11-08 | $30.00 | $600K | -0.1% | +8.1% | +2.7% |
| TDC | SELL · 10b5-1 | 2024-05-24 | 2024-05-29 | $31.95 | $319K | +3.5% | +9.1% | -11.7% |
| TDC | SELL | 2024-02-22 | 2024-02-23 | $38.22 | $3.1M | +2.7% | +1.1% | -13.6% |
| TDC | SELL · 10b5-1 | 2023-11-10 | 2023-11-13 | $46.21 | $693K | -0.6% | -9.9% | +2.6% |
| TDC | SELL · 10b5-1 | 2023-09-11 | 2023-09-13 | $44.39 | $333K | +0.6% | -0.2% | -3.5% |
| TDC | SELL · 10b5-1 | 2023-08-11 | 2023-08-15 | $45.26 | $339K | -1.1% | +0.1% | +3.7% |
| TDC | SELL · 10b5-1 | 2023-06-09 | 2023-06-13 | $49.00 | $613K | -0.1% | +11.1% | -12.5% |
| TDC | SELL | 2023-03-01 | 2023-03-03 | $41.03 | $451K | -8.1% | +1.2% | +16.0% |
| TDC | SELL | 2022-03-02 | 2022-03-03 | $48.75 | $1.9M | -5.6% | +3.2% | -19.7% |
| TDC | SELL | 2021-03-01 | 2021-03-01 | $42.09 | $780K | +3.0% | -8.1% | +15.8% |
| TDC | SELL | 2021-01-26 | 2021-01-28 | $28.86 | $577K | +99.6% | +56.4% | +89.2% |
| FFIV | SELL | 2020-05-01 | 2020-05-05 | $135.52 | $450K | +1.1% | +4.1% | +1.3% |
| FFIV | SELL | 2020-02-03 | 2020-02-05 | $121.93 | $417K | +1.5% | -4.9% | +8.5% |
| FFIV | SELL | 2019-11-01 | 2019-11-05 | $145.32 | $843K | -0.6% | -5.7% | -16.8% |
| FFIV | SELL | 2019-08-01 | 2019-08-05 | $146.98 | $477K | -7.2% | -5.9% | +7.7% |
| FFIV | SELL | 2019-05-01 | 2019-05-03 | $153.84 | $361K | -5.3% | -11.0% | -4.1% |
| FFIV | SELL | 2019-02-01 | 2019-02-05 | $160.79 | $634K | +5.6% | -2.0% | -5.7% |
| FFIV | SELL | 2018-11-01 | 2018-11-05 | $178.17 | $1.7M | -0.4% | -5.0% | -9.5% |
| GFIG | SELL | 2006-09-13 | 2006-09-14 | $54.77 | $548K | N/A | N/A | N/A |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.