Donaldson Company, Inc.
A maker of filters and filtration systems used everywhere from tractor engines to hospital labs. Its products — like PowerCore® air filters, dust collectors, and bioprocessing gear — keep construction, farming, aerospace, and life-sciences equipment running clean, sold to manufacturers and as replacement parts. The company began in 1915, when salesman Frank Donaldson rigged a tractor air cleaner out of a wire cage, eiderdown cloth, and an eight-foot pipe after watching a farmer's machine choke on Utah dust; his boss dismissed the idea, so he started his own company. That first makeshift "Twister" filter grew into one of the world's largest filtration businesses.
Granted 1.14M · Sold 21.6K
Granted 301.2K · Sold 16.5K
Granted 889.8K · Sold 265.0K
Granted 265.0K · Sold 43.5K
Granted 144.1K · Sold 507
Granted 172.7K · Sold 45.9K
Granted 95.3K
Granted 99.3K · Sold 58.2K
Granted 96.6K · Sold 30.6K
Granted 102.2K · Sold 14.6K
Granted 674.39 · Sold 53.8K
Granted 100.7K · Bought 1.5K · Sold 19.2K
Granted 177.5K · Bought 100 · Sold 27.0K
Granted 69.4K · Sold 20.7K
Granted 165.1K · Sold 129.6K
Granted 171.3K · Sold 107.0K
Granted 125.1K · Sold 43.3K
Granted 39.4K · Sold 29.6K
Granted 76.7K · Sold 3.2K
Granted 268.6K · Sold 186.2K
Granted 134.6K · Sold 95.6K
Granted 62.1K · Sold 36.8K
Granted 19.8K · Sold 5.4K
Granted 103.2K · Sold 15.4K
Granted 74.8K · Sold 64.8K
Granted 120.0K · Sold 30.0K
Granted 31.9K · Bought 675 · Sold 3.6K
Granted 165.8K · Bought 1.0K · Sold 144.9K
Granted 95.5K · Sold 74.7K
Granted 29.1K · Sold 10.4K
Granted 84.9K · Sold 45.5K
Granted 74.8K · Sold 45.9K
Granted 27.7K · Sold 1.6K
Granted 17.1K · Bought 1.3K
Granted 15.6K
Granted 12.1K · Bought 3.2K
Granted 39.1K · Bought 1.7K · Sold 26.3K
Granted 59.1K · Bought 2.0K · Sold 32.5K
Granted 7.9K
Granted 7.7K
Granted 5.5K · Sold 2.8K
Granted 4.4K
Granted 5.9K
Granted 121.1K · Sold 72.0K
Granted 2.8K
Granted 2.0K · Sold 2.0K
Granted 4.0K · Sold 566
Granted 1.0K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Cook William MChairman, Director · 282 transactions | — | 1.37Mas of Mar 2016 | 1.14M | — | 21.6K |
| Giertz James RSenior Vice President · 42 transactions | — | 323.8Kas of Sep 2006 | 301.2K | — | 16.5K |
| Carpenter Tod E.Chairman, President and CEO, Director · 217 transactions | — | 309.8K | 889.8K | — | 265.0K |
| Linnell Norman CVice President · 135 transactions | — | 214.7Kas of Jul 2014 | 265.0K | — | 43.5K |
| McMurray Charles JSenior Vice President · 201 transactions | — | 192.4Kas of Dec 2013 | 144.1K | — | 507 |
| Schwab Lowell FSenior Vice President · 122 transactions | — | 185.3Kas of Apr 2010 | 172.7K | — | 45.9K |
| Bastiaens F GuillaumeDirector · 28 transactions | — | 140.7Kas of Sep 2014 | 95.3K | — | — |
| Eugster Jack WDirector · 76 transactions | — | 118.4Kas of Aug 2012 | 99.3K | — | 58.2K |
| Dolan Janet MDirector · 36 transactions | — | 117.4Kas of Sep 2014 | 96.6K | — | 30.6K |
| Noddle JeffreyDirector · 40 transactions | — | 113.8Kas of Sep 2017 | 102.2K | — | 14.6K |
| Touw Geert HenkSenior Vice President · 35 transactions | — | 92.5Kas of Jan 2007 | 674.39 | — | 53.8K |
| Joppa Sandra NVice President · 131 transactions | — | 91.7Kas of Jan 2015 | 100.7K | 1.5K | 19.2K |
| Ward Jay LSenior Vice President · 150 transactions | — | 90.8Kas of Jan 2016 | 177.5K | 100 | 27.0K |
| Grundhofer John FDirector · 57 transactions | — | 68.8Kas of Sep 2012 | 69.4K | — | 20.7K |
| Wiehoff JohnDirector · 60 transactions | — | 63.9Kas of Oct 2022 | 165.1K | — | 129.6K |
| Scalf Thomas RPresident · 90 transactions | — | 56.9Kas of Mar 2025 | 171.3K | — | 107.0K |
| Becker Amy CChief Legal Officer · 113 transactions | — | 56.0K | 125.1K | — | 43.3K |
| Timm David WVice President · 95 transactions | — | 53.1Kas of Feb 2012 | 39.4K | — | 29.6K |
| Lewis Richard BrentPresident · 38 transactions | — | 46.5K | 76.7K | — | 3.2K |
| Robinson Scott J.Chief Financial Officer · 30 transactions | — | 45.1Kas of Oct 2024 | 268.6K | — | 186.2K |
| Rajendra Ajita GDirector · 45 transactions | — | 45.0K | 134.6K | — | 95.6K |
| Briseno GuillermoPresident · 13 transactions | — | 41.3K | 62.1K | — | 36.8K |
| Dahlgren Andrew CPresident · 12 transactions | — | 39.6K | 19.8K | — | 5.4K |
| Perushek Mary LynneVice President · 145 transactions | — | 36.8Kas of Jul 2016 | 103.2K | — | 15.4K |
| Miller Paul DavidDirector · 20 transactions | — | 33.8Kas of Nov 2015 | 74.8K | — | 64.8K |
| Verhage Thomas RVice President · 137 transactions | — | 33.6Kas of Oct 2011 | 120.0K | — | 30.0K |
| Spethmann Jeffrey ESenior Vice President · 73 transactions | — | 32.1Kas of Sep 2022 | 31.9K | 675 | 3.6K |
| Oberton Willard DDirector · 90 transactions | — | 29.8Kas of Jul 2025 | 165.8K | 1.0K | 144.9K |
| Owens JamesDirector · 53 transactions | — | 29.2K | 95.5K | — | 74.7K |
| Vann William IVice President · 50 transactions | — | 28.7Kas of Jun 2008 | 29.1K | — | 10.4K |
| Kramer Sheila G.Chief Human Resources Officer · 23 transactions | — | 28.5Kas of Oct 2024 | 84.9K | — | 45.5K |
| Rautio Trudy A.Director · 45 transactions | — | 27.7K | 74.8K | — | 45.9K |
| Shaw James FVice President · 89 transactions | — | 21.1Kas of Jan 2016 | 27.7K | — | 1.6K |
| Wilfong Debra LVice President · 11 transactions | — | 19.4Kas of Sep 2012 | 17.1K | 1.3K | — |
| Cruz PilarDirector · 31 transactions | — | 16.7K | 15.6K | — | — |
| Hilger Christopher M.Director · 25 transactions | — | 15.8K | 12.1K | 3.2K | — |
| Milroy Douglas A.Director · 19 transactions | — | 15.1K | 39.1K | 1.7K | 26.3K |
| Vermeersch WimVice President · 35 transactions | — | 14.7Kas of Sep 2022 | 59.1K | 2.0K | 32.5K |
| Cecere AndrewDirector · 11 transactions | — | 8.2Kas of Jan 2021 | 7.9K | — | — |
| Smiley Jacinth CDirector · 11 transactions | — | 7.9K | 7.7K | — | — |
| Osland Melissa A.Controller · 14 transactions | — | 7.3Kas of Oct 2018 | 5.5K | — | 2.8K |
| Wu EugeneVice President · 4 transactions | — | 6.9Kas of Dec 2014 | 4.4K | — | — |
| Olson Richard MDirector · 5 transactions | — | 6.1K | 5.9K | — | — |
| Hoffman Michael JDirector · 44 transactions | — | 4.7Kas of Jan 2022 | 121.1K | — | 72.0K |
| Cebulla Andrew J.Corporate Controller · 4 transactions | — | 4.3K | 2.8K | — | — |
| Keller Peter JosephCorporate Controller · 3 transactions | — | 2.3Kas of Dec 2021 | 2.0K | — | 2.0K |
| Pogalz Bradley J.Chief Financial Officer · 4 transactions | — | 2.2K | 4.0K | — | 566 |
| Shine Daniel PDirector · 2 transactions | — | 1.0K | 1.0K | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over all recorded history: -1.82M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.