David S. Rosenblatt is CEO at 1stdibs.com, Inc. (DIBS). They have made 18 open-market trades across 4 companies since 2014, most recently 2026-09-08.
CIK 0001237860
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.
3 open-market purchases totalling $3.5M since 2021, against 15 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| DIBS | 2,203,074 | $9.4M |
| TWTR | 117,765 | $6.3M |
| MTCH | 109,560 | $4.7M |
| IAC | 85,756 | $3.6M |
| IACI | 55,058 | $2.8M |
| ETSY | 6,032 | $514K |
| GSIC | 7,760 | — |
| PPLI | 97,261 | — |
| Total | $27.4M |
Shares reported on the most recent Form 4, priced at the 2026-09-10 close. 2 holdings could not be priced and are 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 |
|---|---|---|---|---|---|---|---|---|
| DIBS | BUY | 2026-05-12 | 2026-05-13 | $4.51 | $214K | +3.3% | -9.8% | -2.8% |
| DIBS | SELL | 2025-12-08 | 2025-12-10 | $5.96 | $873K | -1.5% | -3.0% | -8.7% |
| DIBS | SELL | 2025-11-24 | 2025-11-26 | $5.09 | $6.1M | +8.7% | +3.0% | -5.1% |
| DIBS | SELL | 2025-09-08 | 2025-09-10 | $2.80 | $410K | +4.3% | -7.9% | +125.3% |
| DIBS | SELL | 2023-09-15 | 2023-09-19 | $3.87 | $20K | -5.7% | -4.7% | +10.6% |
| DIBS | SELL | 2023-09-13 | 2023-09-15 | $4.12 | $21K | -6.9% | -2.6% | +14.9% |
| DIBS | SELL | 2023-09-11 | 2023-09-13 | $4.18 | $21K | -12.2% | -13.0% | +8.4% |
| DIBS | SELL | 2023-06-09 | 2023-06-13 | $3.88 | $55K | -2.4% | +8.5% | +10.4% |
| DIBS | BUY | 2021-11-19 | 2021-11-23 | $13.37 | $301K | +6.7% | +4.7% | -19.2% |
| DIBS | BUY | 2021-08-16 | 2021-08-18 | $14.94 | $3.0M | +5.3% | -5.5% | -17.0% |
| TWTR | SELL | 2020-02-13 | 2020-02-14 | $37.05 | $3.0M | -10.3% | -28.7% | -22.3% |
| TWTR | SELL | 2020-02-10 | 2020-02-12 | $36.12 | $2.9M | -3.3% | -19.6% | -20.0% |
| TWTR | SELL | 2019-07-26 | 2019-07-30 | $40.04 | $1.6M | +1.1% | +3.4% | -26.8% |
| IAC | SELL · Routine | 2019-02-12 | 2019-02-14 | $220.64 | $999K | -3.5% | -3.1% | +3.8% |
| TWTR | SELL | 2018-11-02 | 2018-11-02 | $34.30 | $2.1M | -3.9% | -1.7% | -2.0% |
| IAC | SELL | 2017-11-27 | 2017-11-29 | $133.00 | $798K | -6.1% | -5.1% | +15.7% |
| TWTR | SELL | 2017-02-15 | 2017-02-17 | $16.68 | $834K | -5.2% | -9.4% | +11.1% |
| TWTR | SELL | 2014-08-25 | 2014-08-27 | $46.15 | $2.3M | -14.1% | +3.7% | +3.7% |
| IACI | SELL | 2014-08-20 | 2014-08-22 | $68.27 | $512K | -7.6% | -0.8% | -0.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.