Summary
Updated Aug 31, 2026
Vanessa C. L. Chang files SEC Form 4 reports at Transocean Ltd. (RIG). 3 SEC Form 4 filings on record going back to 2025, most recently on 27 May 2026. Most recent open-market trade: bought $21K of RIG on 2 May 2025. Lifetime open-market purchases: $21K.
Recent Transactions
1Every recent SEC Form 4 transaction Vanessa C. L. Chang has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Vanessa C. L. Chang files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Frederik Wilhelm Mohn - $18.23M of RIG open-market activity in the last 12 months
- Perestroika (Cyprus) Ltd - $18.23M of RIG open-market activity in the last 12 months
- Perestroika - $18.23M of RIG open-market activity in the last 12 months
- Jeremy D. Thigpen - $2.16M of RIG open-market activity in the last 12 months
- Brady K. Long - $1.57M of RIG open-market activity in the last 12 months
- Roderick James Mackenzie - $863K of RIG open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Vanessa C. L. Chang?
Vanessa C. L. Chang is a corporate insider of Transocean Ltd. (RIG). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Vanessa C. L. Chang last file a Form 4?
The most recent primary Form 4 on record is dated 27 May 2026, one of 3 filings going back to 2025.
Has Vanessa C. L. Chang been buying or selling stock?
Recorded transactions: 1 open-market purchase ($21K) and 0 open-market sales across all tracked filings.
Where can I see all of Vanessa C. L. Chang's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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