Summary
Updated Aug 31, 2026
Diego Donoso is Director of Atmus Filtration Technologies Inc. (ATMU). 3 SEC Form 4 filings on record going back to 2024, most recently on 13 May 2026. Most recent open-market trade: sold $977 of ATMU on 19 November 2025. Lifetime open-market purchases: $2K. Lifetime open-market sales: $2K.
Recent Transactions
7Every recent SEC Form 4 transaction Diego Donoso has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Diego Donoso go back to 2024: 3 primary Form 4 filings, an average of 1.0 per year. The typical open-market purchase is $906 (2 buys totaling $2K). The largest single buy on record is $1K of ATMU in 2025. Sales side: 2 recorded sales totaling $2K, so the filing history runs sell-heavy by dollar value. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Diego Donoso 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.
- Stephanie Disher - $1.16M of ATMU open-market activity in the last 12 months
- Renee Swan - $313K of ATMU open-market activity in the last 12 months
- Jack Kienzler - $232K of ATMU open-market activity in the last 12 months
- Charles Masters - $131K of ATMU open-market activity in the last 12 months
- Gretchen R. Haggerty - $110K of ATMU open-market activity in the last 12 months
- Stephen E. Macadam - $100K of ATMU 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 Diego Donoso?
Diego Donoso is a corporate insider, tracked as Director of Atmus Filtration Technologies Inc. (ATMU). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Diego Donoso last file a Form 4?
The most recent primary Form 4 on record is dated 13 May 2026, one of 3 filings going back to 2024.
Has Diego Donoso been buying or selling stock?
Recorded transactions: 2 open-market purchases ($2K) and 2 open-market sales ($2K) across all tracked filings.
Where can I see all of Diego Donoso'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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