InsiderChief Legal Off. & Corp. Sec.
Mark Reinstra Insider Trading Activity
Every SEC Form 4 transaction reported by Mark Reinstra, sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud · Insider-trading data from SEC EDGAR
Latest filing:
Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.
Quick Answer
Is Mark Reinstra buying or selling?
Mark Reinstra reported 0 open-market buys ($0) and 54 sells ($84.3M) across 54 Form 4 filings at 1 company — a net selling position of $84.3M.
Source: SEC EDGAR Form 4
What stands out
- All 54 of Mark Reinstra's Form 4 filings are for one company, Roblox Corp (RBLX).
- The most recent Form 4 was accepted on Oct 6, 2026 (12 days ago).
- In the last 12 months: no open-market purchases and 13 sales ($13.3M).
- The largest open-market sale in the last 12 months was $3.8M of Roblox Corp (RBLX) on Feb 19, 2026. SEC ↗
Key Statistics (as of Oct 6, 2026)
Total Form 4 filings
54
SEC EDGAR
Companies
1
Buys (0)
$0
Sells (54)
$84.3M
Insider sentiment
Net sellingNet insider flow of $84.3M in net selling, filed between Mar 13, 2021 – Oct 6, 2026.
Companies Mark Reinstra files for
| # | Company | Form 4 filings |
|---|---|---|
| 1 | RBLXRoblox Corp | 54 |
Recent Mark Reinstra transactions
| Date | Ticker | Role | Type | Shares | Value | Filing |
|---|---|---|---|---|---|---|
| Oct 6, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 5.7K | $250.4K | SEC ↗ |
| Sep 9, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 5.8K | $258.6K | SEC ↗ |
| Aug 24, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 17.9K | $680.8K | SEC ↗ |
| Aug 20, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 6.3K | $250.0K | SEC ↗ |
| Jul 7, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 4.5K | $258.7K | SEC ↗ |
| Jun 8, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 6.0K | $249.3K | SEC ↗ |
| May 22, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 22.7K | $1.0M | SEC ↗ |
| Apr 15, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 18.7K | $1.1M | SEC ↗ |
| Feb 24, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 17.2K | $1.1M | SEC ↗ |
| Feb 19, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 60.0K | $3.8M | SEC ↗ |
| Feb 11, 2026 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 34.3K | $2.5M | SEC ↗ |
| Nov 25, 2025 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 16.8K | $1.6M | SEC ↗ |
| Nov 7, 2025 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 2.4K | $251.1K | SEC ↗ |
| Aug 22, 2025 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 15.8K | $1.9M | SEC ↗ |
| Jun 18, 2025 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 150.0K | $15.0M | SEC ↗ |
| May 29, 2025 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 50.0K | $4.2M | SEC ↗ |
| May 22, 2025 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 15.9K | $1.3M | SEC ↗ |
| Feb 24, 2025 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 16.4K | $1.0M | SEC ↗ |
| Feb 13, 2025 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 19.5K | $1.3M | SEC ↗ |
| Jan 24, 2025 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 24.0K | $1.6M | SEC ↗ |
| Jan 21, 2025 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 50.0K | $3.2M | SEC ↗ |
| Dec 27, 2024 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 24.0K | $1.4M | SEC ↗ |
| Dec 13, 2024 | RBLX | Chief Legal Off. & Corp. Sec. | Sale | 5.0K | $300.0K | SEC ↗ |
| Nov 26, 2024 | RBLX | Gen. Counsel & Secretary | Sale | 9.0K | $438.7K | SEC ↗ |
| Nov 22, 2024 | RBLX | Gen. Counsel & Secretary | Sale | 16.5K | $847.6K | SEC ↗ |
Showing the 25 most recent filings of 54. Screen every filing.
Mark Reinstra insider trading FAQ
Is Mark Reinstra buying or selling?
Across 54 SEC Form 4 filings, Mark Reinstra reported 0 open-market purchases totaling $0 and 54 sales totaling $84.3M — a net selling position of $84.3M.
Which companies does Mark Reinstra file Form 4s for?
Mark Reinstra has reported insider transactions at 1 company, most often Roblox Corp (RBLX).
How far back does Mark Reinstra's filing history go?
Trabud holds Mark Reinstra's SEC Form 4 filings from Mar 13, 2021 – Oct 6, 2026, sourced directly from SEC EDGAR.
Where does Trabud get Mark Reinstra's insider trading data?
Directly from SEC EDGAR Form 4 filings. Every transaction on this page is a real filing accepted by the SEC, updated as new filings arrive.
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