David Aaron Lehman is CLO at Pulmonx Corp (LUNG). They have made 25 open-market trades across 3 companies since 2008, most recently 2026-09-01.
CIK 0001354228
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 |
|---|---|---|
| XENT | 68,465 | $1.9M |
| THOR | 71,655 | $1.8M |
| LUNG | 361,827 | $640K |
| Total | $4.4M |
Shares reported on the most recent Form 4, priced at the 2026-09-03 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 |
|---|---|---|---|---|---|---|---|---|
| LUNG | SELL | 2026-09-01 | 2026-09-03 | $2.26 | $32K | -15.0% | -17.4% | — |
| LUNG | SELL | 2026-06-01 | 2026-06-03 | $1.54 | $22K | -16.9% | -4.5% | +46.4% |
| LUNG | SELL | 2026-03-02 | 2026-03-04 | $1.43 | $17K | +11.0% | -5.5% | +11.7% |
| LUNG | SELL | 2025-12-01 | 2025-12-03 | $1.57 | $16K | +35.6% | +22.3% | -18.6% |
| LUNG | SELL | 2025-09-02 | 2025-09-03 | $1.60 | $16K | -3.6% | +11.5% | +6.1% |
| LUNG | SELL | 2025-06-02 | 2025-06-04 | $3.13 | $33K | -2.6% | -13.7% | -43.5% |
| LUNG | SELL · 10b5-1 | 2025-03-03 | 2025-03-05 | $7.77 | $279K | -3.2% | -16.0% | -60.5% |
| LUNG | SELL | 2024-12-02 | 2024-12-04 | $6.19 | $34K | -3.7% | +1.7% | +34.6% |
| LUNG | SELL | 2024-09-03 | 2024-09-05 | $6.69 | $39K | +21.4% | +4.0% | -3.2% |
| LUNG | SELL | 2024-06-03 | 2024-06-05 | $6.97 | $38K | -16.0% | -7.4% | -7.3% |
| LUNG | SELL | 2024-03-01 | 2024-03-05 | $9.06 | $39K | -0.6% | -12.7% | -23.3% |
| LUNG | SELL | 2023-12-01 | 2023-12-05 | $10.34 | $39K | +5.0% | +2.4% | -20.9% |
| LUNG | SELL | 2023-09-01 | 2023-09-06 | $10.01 | $38K | -4.3% | -9.0% | +5.3% |
| LUNG | SELL | 2023-06-01 | 2023-06-02 | $11.48 | $43K | +1.5% | +3.3% | -16.7% |
| LUNG | SELL | 2023-03-01 | 2023-03-03 | $11.03 | $14K | -5.4% | -8.0% | +2.7% |
| LUNG | SELL | 2022-12-01 | 2022-12-05 | $5.93 | $6K | +15.9% | +33.9% | +91.1% |
| LUNG | SELL | 2022-09-01 | 2022-09-06 | $17.88 | $19K | +2.7% | -4.9% | -65.3% |
| LUNG | SELL | 2022-06-01 | 2022-06-03 | $18.05 | $19K | -21.9% | -11.3% | -3.6% |
| LUNG | SELL | 2022-03-01 | 2022-03-03 | $25.91 | $12K | -8.8% | +9.9% | -25.0% |
| LUNG | SELL | 2021-12-01 | 2021-12-03 | $32.73 | $13K | +9.6% | +20.9% | -18.7% |
| LUNG | SELL | 2021-09-01 | 2021-09-03 | $40.09 | $15K | -5.9% | -9.3% | -26.4% |
| XENT | SELL | 2019-05-06 | 2019-05-08 | $33.02 | $297K | -1.8% | -9.8% | -35.2% |
| XENT | SELL | 2019-05-06 | 2019-05-08 | $33.02 | $297K | -1.8% | -9.8% | -35.2% |
| XENT | SELL | 2019-04-29 | 2019-05-01 | $33.04 | $297K | -15.2% | -27.0% | -37.7% |
| XENT | SELL | 2017-12-11 | 2017-12-13 | $32.75 | $1.2M | -0.6% | +5.5% | +19.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.