John D Diekman
CIK 1240357 · last filed 2026-06-22
John D Diekman is a corporate insider who has filed 27 SEC Form 4 insider transactions across 5 companies since 2007. The most recent filing, for ZLAB, was dated Jun 22, 2026. Across all open-market trades the lifetime net is −$75.3M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $5.8M across reported positions. 49 SEC filings were submitted jointly with Scott M Rocklage.
"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.
APRE 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
4 EMBARCADERO CENTER, SUITE 3110
SAN FRANCISCO, CA 94111
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ZLAB | Director | 122,140 | $24.34 | $2.97M | -$444.9K | 10 | 2026-06-22 |
| FIXX | 10%+ Owner | 11,191 | $6.93 | $77.6K | -$36.76M | 1 | 2020-12-16 |
| APRE | 3,798 | $0.45 | $1.7K | -$39.85M | 1 | 2020-10-07 | |
| IDYA | Director | 84,420 | $32.88 | $2.78M | $2.50M | 2 | 2019-12-19 |
| AFFYMETRIX INC (AFFX) Delisted | Director | 103,398 | — | — | -$725.4K | 13 | 2012-05-15 |
Recent Filings
27 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-06-22 | ZLAB | Grant (A) | +22,371 | $0 | EDGAR |
| 2025-06-23 | ZLAB | Grant (A) | +10,831 | $0 | EDGAR |
| 2024-06-20 | ZLAB | Grant (A) | +21,253 | $0 | EDGAR |
| 2023-06-30 | ZLAB | Grant (A) | +18,903 | $500.0K | EDGAR |
| 2022-02-07 | ZLAB | Sell (S) | −1,000 | -$50.2K | EDGAR |
| 2022-01-04 | ZLAB | Grant (A) | +7,763 | $0 | EDGAR |
| 2021-11-08 | ZLAB | Sell (S) | −1,000 | -$91.7K | EDGAR |
| 2021-08-05 | ZLAB | Sell (S) | −1,000 | -$149.5K | EDGAR |
| 2021-05-06 | ZLAB | Sell (S) | −1,000 | -$153.6K | EDGAR |
| 2021-01-20 | ZLAB | Grant (A) | +3,852 | $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.