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DONALD J LISTWIN

CIK 1211436 · last filed 2023-08-04

DONALD J LISTWIN is a corporate insider who has filed 75 SEC Form 4 insider transactions across 3 companies since 2010. The most recent filing, for CALX, was dated Aug 4, 2023. Across all open-market trades the lifetime net is −$4.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $30.0M across reported positions.

"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

$29.96M

Companies

3

Total Filings

75

Lifetime Open-Market Net

-$4.58M

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
CALX Director 807,533 $37.10 $29.96M -$5.91M 64 2023-08-04
Violin Memory Inc (VMEM) Delisted Director 125,000 — — $438.1K 6 2016-07-05
Isilon Systems, Inc. (ISLN) Delisted Director 0 — — $886.5K 4 2010-12-21

Recent Filings

75 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
2023-08-04 CALX Notice (144) −100,000 -$4.32M EDGAR
2023-08-04 CALX Sell (S) −100,000 -$4.32M EDGAR
2023-05-19 CALX Grant (A) — $0 EDGAR
2023-05-18 CALX Exer (M) +9,960 $333.3K EDGAR
2023-05-12 CALX Grant (A) — $0 EDGAR
2023-04-25 CALX Gift (G) −2,500 $0 EDGAR
2023-02-01 CALX Gift (G) −9,000 $0 EDGAR
2023-01-23 CALX Exer (M) +9,073 $353.5K EDGAR
2022-10-31 CALX Mixed −110,000 -$7.28M EDGAR
2022-08-05 CALX Sell (S) −35,000 -$2.04M EDGAR
Showing 1–10 of 75
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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.