SCHEDULE 13D

TENNANT CO

Common Stock, par value $0.375 per share · CUSIP: 880345103

Event date: 2026-03-06

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• GAMCO INVESTORS, INC. ET ALReported CIK 0000807249

  Shares: 0.00 · Class: 0.0%

• GABELLI FUNDS LLCReported CIK 0001081407

  Shares: 189,200.00 · Class: 1.1%

• GAMCO Asset Management Inc.Reported CIK 0001460612

  Shares: 675,400.00 · Class: 3.8%

• GABELLI FOUNDATION, INC.

  Shares: 9,000.00 · Class: 0.1%

• MJG ASSOCIATES, INC.

  Shares: 7,200.00 · Class: 0.0%

• Teton Advisors, LLCReported CIK 0002086025

  Shares: 8,500.00 · Class: 0.1%

• GGCP, INC.Reported CIK 0001238894

  Shares: 0.00 · Class: 0.0%

• Associated Capital Group, Inc.Reported CIK 0001642122

  Shares: 1,000.00 · Class: 0.0%

• GABELLI MARIO JReported CIK 0001185533

  Shares: 600.00 · Class: 0.0%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.