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.
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 the last year: -74.3K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.