David R Walt
CIK 1205236 · last filed 2026-01-06
David R Walt is a corporate insider who has filed 327 SEC Form 4 insider transactions across 4 companies since 2007. The most recent filing, for QTRX, was dated Jan 6, 2026. Across all open-market trades the lifetime net is −$97.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $187.1M across reported positions. 152 SEC filings were submitted jointly with ILLUMINA, INC.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
ILMN price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
SAN DIEGO, CA 92122
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| QTRX | Director | 1,872,890 | $2.83 | $5.30M | $7.94M | 18 | 2026-01-06 |
| XCUR | Director | 13,725 | $1.09 | $15.0K | $2.35M | 3 | 2020-06-08 |
| Dare Bioscience, Inc. (CERU) Delisted | Director | 19,370 | — | — | $436.1K | 24 | 2017-01-05 |
| ILMN | Director | 670,600 | $271.04 | $181.76M | -$108.29M | 279 | 2016-04-11 |
Recent Filings
327 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-01-06 | QTRX | Grant (A) | +1,215 | $0 | EDGAR |
| 2025-10-03 | QTRX | Grant (A) | +2,594 | $14.4K | EDGAR |
| 2025-07-02 | QTRX | Grant (A) | +2,148 | $14.4K | EDGAR |
| 2025-06-13 | QTRX | Buy (P) | +160,000 | $985.0K | EDGAR |
| 2025-06-09 | QTRX | Buy (P) | +210,000 | $1.13M | EDGAR |
| 2025-04-03 | QTRX | Grant (A) | +2,156 | $14.4K | EDGAR |
| 2025-01-06 | QTRX | Grant (A) | +7,435 | $0 | EDGAR |
| 2024-09-17 | QTRX | Mixed | +45,000 | $624.6K | EDGAR |
| 2024-01-04 | QTRX | Grant (A) | +2,947 | $0 | EDGAR |
| 2023-01-04 | QTRX | Grant (A) | +8,083 | $0 | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.