Summary
Updated Aug 30, 2026
Nathan I. Partain is Director of Otter Tail Corp (OTTR). 2 SEC Form 4 filings on record going back to 2025, most recently on 14 April 2026.
Recent Transactions
2Every recent SEC Form 4 transaction Nathan I. Partain 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 Nathan I. Partain 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.
- Paul L. Knutson - $394K of OTTR 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 Nathan I. Partain?
Nathan I. Partain is a corporate insider, tracked as Director of Otter Tail Corp (OTTR). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Nathan I. Partain last file a Form 4?
The most recent primary Form 4 on record is dated 14 April 2026, one of 2 filings going back to 2025.
Where can I see all of Nathan I. Partain'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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