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Mark Culhane

CIK 1407712 · Chief Financial Officer · last filed 2025-10-03

Mark Culhane is a Chief Financial Officer who has filed 62 SEC Form 4 insider transactions across 4 companies since 2007. The most recent filing, for GNSS, was dated Oct 3, 2025. Across all open-market trades the lifetime net is −$6.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $8.6M 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

$8.57M

Companies

4

Total Filings

62

Lifetime Open-Market Net

-$6.62M

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
GNSS Director 114,547 $1.69 $193.6K $133.2K 4 2025-10-03
TDC Chief Financial Officer 286,857 $29.19 $8.37M $748.0K 14 2021-05-28
CALLIDUS SOFTWARE INC (CALD) Delisted Director 33,520 — — -$1.26M 12 2017-06-15
DemandTec, Inc. (DMAN) Delisted EVP & CFO 15,200 — — -$6.24M 31 2012-02-16

Recent Filings

62 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
2025-10-03 GNSS Grant (A) +6,411 $0 EDGAR
2025-03-19 GNSS Grant (A) +38,136 $0 EDGAR
2024-08-19 GNSS Buy (P) +50,000 $133.2K EDGAR
2024-07-12 GNSS Grant (A) +20,000 $0 EDGAR
2021-05-28 TDC Sell (S) −3,957 -$191.6K EDGAR
2021-03-02 TDC Mixed −3,359 -$1.34M EDGAR
2021-03-01 TDC Mixed — $9.0K EDGAR
2021-02-03 TDC Mixed +47,489 -$1.27M EDGAR
2020-11-27 TDC Sell (S) −7,050 -$153.7K EDGAR
2020-03-12 TDC Buy (P) +10,150 $199.7K EDGAR
Showing 1–10 of 62
Page 1 of 7
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.