David H. Li is CEO & President at CMC Materials, Inc. (CCMP). They have made 25 open-market trades across 2 companies since 2009, most recently 2026-10-03.
CIK 0001436880
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 25 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| CCMP | 74,535 | $12.9M |
| NGVT | 120,544 | $8.4M |
| HXL | 4,952 | $447K |
| Total | $21.8M |
Shares reported on the most recent Form 4, priced at the 2026-10-05 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 |
|---|---|---|---|---|---|---|---|---|
| NGVT | SELL | 2026-08-14 | 2026-08-18 | $75.77 | $765K | -7.6% | -9.2% | — |
| NGVT | SELL | 2026-08-12 | 2026-08-14 | $76.18 | $762K | -8.1% | -10.0% | — |
| CCMP | SELL | 2021-12-20 | 2021-12-20 | $184.40 | $3.7M | +2.3% | -1.9% | -0.0% |
| CCMP | SELL | 2021-03-04 | 2021-03-08 | $164.67 | $12.5M | +7.2% | +22.0% | -9.6% |
| CCMP | SELL | 2020-02-10 | 2020-02-11 | $160.69 | $10.9M | -8.8% | -41.0% | -21.8% |
| CCMP | SELL | 2019-08-12 | 2019-08-13 | $114.28 | $3.1M | +2.5% | +19.6% | +34.4% |
| CCMP | SELL | 2019-08-12 | 2019-08-13 | $114.28 | $3.1M | +2.5% | +19.6% | +34.4% |
| CCMP | SELL | 2018-02-01 | 2018-02-05 | $102.13 | $3.1M | +6.0% | +16.2% | +13.6% |
| CCMP | SELL | 2017-11-17 | 2017-11-20 | $98.48 | $1.0M | -5.3% | -5.5% | +2.4% |
| CCMP | SELL | 2017-05-01 | 2017-05-01 | $78.83 | $3.4M | -1.4% | -4.2% | -5.9% |
| CCMP | SELL | 2016-12-09 | 2016-12-12 | $62.20 | $1.4M | +0.4% | +2.0% | +11.4% |
| CCMP | SELL | 2016-12-09 | 2016-12-12 | $62.20 | $1.4M | +0.4% | +2.0% | +11.4% |
| CCMP | SELL | 2016-08-03 | 2016-08-04 | $50.05 | $1.6M | -2.0% | +0.4% | +8.8% |
| CCMP | SELL | 2016-08-03 | 2016-08-04 | $50.05 | $2.6M | -2.0% | +0.4% | +8.8% |
| CCMP | SELL | 2014-11-13 | 2014-11-13 | $48.08 | $628K | -9.5% | +0.6% | +0.6% |
| CCMP | SELL | 2013-08-02 | 2013-08-05 | $36.15 | $1.1M | -9.5% | +0.6% | +0.6% |
| CCMP | SELL | 2013-08-02 | 2013-08-06 | $37.42 | $53K | -9.5% | +0.6% | +0.6% |
| CCMP | SELL | 2012-12-12 | 2012-12-12 | $34.35 | $170K | -9.5% | +0.6% | +0.6% |
| CCMP | SELL | 2012-03-14 | 2012-03-15 | $39.14 | $647K | -9.5% | +0.6% | +0.6% |
| CCMP | SELL | 2011-12-08 | 2011-12-09 | $40.32 | $144K | -9.5% | +0.6% | +0.6% |
| CCMP | SELL | 2011-12-01 | 2011-12-01 | $41.15 | $424K | -9.5% | +0.6% | +0.6% |
| CCMP | SELL | 2010-12-06 | 2010-12-06 | $40.31 | $112K | -9.5% | +0.6% | +0.6% |
| CCMP | SELL | 2010-12-02 | 2010-12-03 | $41.25 | $1.0M | -9.5% | +0.6% | +0.6% |
| CCMP | SELL | 2010-04-27 | 2010-04-29 | $39.16 | $80K | -9.5% | +0.6% | +0.6% |
| CCMP | SELL | 2009-04-30 | 2009-05-04 | $28.96 | $20K | -9.5% | +0.6% | +0.6% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.