Insider profile
Mark Culhane Insider Trading
This page tracks every SEC Form 4 filing since April 2023 by Mark Culhane: 6 transactions in total, including 3 open-market purchases and 0 sales. Each record is parsed directly from the original filing, with amendments reconciled so a corrected filing never double-counts.
- Role
- Director
- CIK
- 0001407712
- Companies traded
- 1
- Total filings
- 6
- First filing
- 2024-07-10
- Last filing
- 2025-10-01
Files as Culhane Mark · SEC EDGAR ↗
Activity summary
The most recent open-market decision was a purchase of 613 shares ($2K) on August 19, 2024.
Quarterly balance
Buy and sell value by quarter, Q3 24 to Q4 25. Mark Culhane has been a net buyer across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $133K.
Insider insight
Mark Culhane trades most actively in GNSS, accounting for 3 of the 6 filings on record. The largest single open-market purchase on record is $85K in GNSS, filed Aug 2024.
Track record
Most active in
Transaction History
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
Showing 5 of 6 transactions. The most significant are picked first.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 1, 2025 | Mark Culhane | GNSS | Award | 6,411 | — | — |
| Mar 17, 2025 | Mark Culhane | GNSS | Award | 38,136 | — | — |
| Aug 19, 2024 | Mark Culhane | GNSS | Purchase | 613 | $2.70 | $2K |
| Aug 16, 2024 | Mark Culhane | GNSS | Purchase | 31,800 | $2.67 | $85K |
| Aug 15, 2024 | Mark Culhane | GNSS | Purchase | 17,587 | $2.65 | $47K |
Query this yourself
The same rows, over the API.
curl "https://api.form4api.com/v1/insiders/0001407712/transactions" \
-H "X-Api-Key: $KEY"Companies traded
By number of filings.
Filing cadence
Filings per quarter, this window.
Busiest: Q3 24 (4 filings)
Quietest: Q4 24 (0 filings)
Reading an insider's Form 4 history
Corporate insiders (directors, officers, and holders of more than 10% of a company's stock) must report their trades to the SEC on Form 4 within two business days. Looking at one insider's filings over time shows whether they tend to buy on the open market (a discretionary use of their own money, generally the strongest signal), sell, or simply receive and exercise equity awards as compensation.
The track record above measures how this insider's past open-market purchases performed in the months after each filing. Trades made under a pre-scheduled Rule 10b5-1 plan are flagged because they carry no timing signal. To pull any insider's full history programmatically, see the insider trading API or our guide to reading Form 4 filings.