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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 $6.6M 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.

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Disclosed Exposure

$6.59M

Companies

5

Total Filings

27

Lifetime Open-Market Net

-$75.27M

Filer Profile

Reported Address
C/O 5AM VENTURE MANAGEMENT, LLC
4 EMBARCADERO CENTER, SUITE 3110
SAN FRANCISCO, CA 94111
Related Filers
SCOTT M ROCKLAGE — 49 joint filings, latest 2026-08-20
Andrew J. Schwab — 49 joint filings, latest 2023-04-12
5AM Co-Investors IV, L.P. — 33 joint filings, latest 2023-04-12
5AM Partners IV, LLC — 33 joint filings, latest 2023-04-12
5AM Ventures IV, L.P. — 33 joint filings, latest 2023-04-12
5AM Opportunities I (GP), LLC — 16 joint filings, latest 2023-04-12
5AM Opportunities I, L.P. — 16 joint filings, latest 2023-04-12
5AM Co-Investors III, L.P. — 12 joint filings, latest 2019-09-18
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
ZLAB Director 122,140 $26.23 $3.20M -$444.9K 10 2026-06-22
FIXX 10%+ Owner 1,243 $12.65 $15.7K -$36.76M 1 2020-12-16
APRE 3,798 $0.79 $3.0K -$39.85M 1 2020-10-07
IDYA Director 84,420 $39.86 $3.36M $2.50M 2 2019-12-19
AFFYMETRIX INC (AFFX) Delisted Director 103,398 — — -$725.4K 13 2012-05-15

Recent Filings

27 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
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
Showing 1–10 of 27
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
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.