Gary M. Pfeiffer is Director at QUEST DIAGNOSTICS INC (DGX). They have made 9 open-market trades across 2 companies since 2012, most recently 2026-05-20.
CIK 0001127304
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.
1 open-market purchase totalling $66K since 2018, against 8 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| DGX | 31,005 | $7.3M |
| DD | 54,137 | $7.1M |
| INAP | 80,695 | $7K |
| TLB | 28,000 | — |
| Total | $14.4M |
Shares reported on the most recent Form 4, priced at the 2026-05-21 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 |
|---|---|---|---|---|---|---|---|---|
| DGX | SELL | 2025-10-22 | 2025-10-24 | $182.40 | $541K | -1.7% | +5.1% | +0.4% |
| INAP | BUY | 2018-11-12 | 2018-11-14 | $6.56 | $66K | -6.4% | -31.3% | -9.0% |
| DGX | SELL | 2016-11-15 | 2016-11-17 | $85.09 | $3.6M | +2.1% | +7.8% | +11.3% |
| DGX | SELL | 2016-11-15 | 2016-11-17 | $85.10 | $5.2M | +2.1% | +7.8% | +11.3% |
| DGX | SELL | 2015-02-04 | 2015-02-05 | $72.43 | $579K | -4.9% | +0.9% | +0.9% |
| DGX | SELL | 2014-11-10 | 2014-11-12 | $61.69 | $617K | -4.9% | +0.9% | +0.9% |
| DGX | SELL | 2014-05-07 | 2014-05-09 | $55.95 | $560K | -4.9% | +0.9% | +0.9% |
| DGX | SELL | 2013-10-25 | 2013-10-25 | $58.10 | $116K | -4.9% | +0.9% | +0.9% |
| DGX | SELL · 10b5-1 | 2013-01-17 | 2013-01-18 | $60.00 | $600K | -4.9% | +0.9% | +0.9% |
| DGX | SELL | 2012-05-02 | 2012-05-03 | $58.30 | $583K | -4.9% | +0.9% | +0.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.