Updated Jul 16, 2026 · Last SEC filing 2026-05-11
TENNANT CO (TNC) has filed 11 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-05-11. 3 Form 8-K material event filings were reported by TNC in the last 90 days. 1 Form 144 notices of proposed sale were filed for TNC stock. InsiderAlpha tracks every TNC SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SEC CIK | 0000097134 |
|---|
| Form 4 filings (90d) | 11 |
|---|---|
| Form 8-K filings (90d) | 3 |
| Form 144 notices (90d) | 1 |
| Latest Form 4 filing | 2026-05-11 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Mulligan Donal L | Insider | A — Grant or award | 1.5K | $0.00 | — | SEC | |
| EICHER CAROL S | Insider | A — Grant or award | 1.5K | $0.00 | — | SEC | |
| Morse Timothy R. | Insider | A — Grant or award | 1.5K | $0.00 | — | SEC | |
| Hider Andrew P. | Insider | A — Grant or award | 1.5K | $0.00 | — | SEC | |
| Windley David | Insider | A — Grant or award | 1.5K | $0.00 | — | SEC | |
| Zay Richard H. | CHIEF COMMERCIAL OFFICER | S — Open-market sale | 6.9K | $88.02 | $605K | SEC | |
| Glerum James T Jr. | Insider | A — Grant or award | 1.5K | $0.00 | — | SEC | |
| ALLEN PATRICK E | Insider | A — Grant or award | 1.5K | $0.00 | — | SEC | |
| Arvani Azita | Insider | A — Grant or award | 1.5K | $0.00 | — | SEC | |
| GREEN MARIA C | Insider | A — Grant or award | 1.5K | $0.00 | — | SEC | |
| SHEAHAN MARK W | Insider | A — Grant or award | 1.5K | $0.00 | — | SEC | |
| Mulligan Donal L | Insider | M — Option exercise | 3.5K | $54.70 | $194K | SEC | |
| Mulligan Donal L | Insider | F — Tax withholding / forfeiture | 2.5K | $78.81 | $194K | SEC | |
| Huml David W. | PRESIDENT AND CEO | G — Bona-fide gift | 26.8K | $0.00 | — | SEC | |
| Huml David W. | PRESIDENT AND CEO | G — Bona-fide gift | 26.8K | $0.00 | — | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for TENNANT CO (TNC). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Hider Andrew P. | 1 | — |
| EICHER CAROL S | 1 | — |
| Zay Richard H. | 1 | $605K |
| GREEN MARIA C | 1 | — |
| ALLEN PATRICK E | 1 | — |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in TNC insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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