| SC 13G/A | 2011-02-04 | VANGUARD FIDUCIARY TRUST CO | TENNANT CO | 1,678,168 | 8.8% | EDGAR |
| SC 13G/A | 2011-01-25 | ROYCE & ASSOCIATES LLC | TENNANT CO | 2,291,855 | 12.1% | EDGAR |
| SC 13G/A | 2010-02-16 | KEELEY ASSET MANAGEMENT CORP | TENNANT CO | 1,947,740 | 10.4% | EDGAR |
| SC 13G | 2010-02-11 | PRICE T ROWE ASSOCIATES INC /MD/ | TENNANT CO | 1,116,900 | 5.9% | EDGAR |
| SC 13G/A | 2010-02-08 | VANGUARD FIDUCIARY TRUST CO | TENNANT CO | 1,863,128 | 10.0% | EDGAR |
| SC 13G | 2010-01-29 | BlackRock Inc. | TENNANT CO | 1,003,639 | 5.4% | EDGAR |
| SC 13G/A | 2010-01-26 | ROYCE & ASSOCIATES LLC | TENNANT CO | 2,167,700 | 11.6% | EDGAR |
| SC 13G/A | 2009-05-08 | NEUBERGER BERMAN INC | TENNANT CO | 127,968 | 0.7% | EDGAR |
| SC 13D | 2009-04-06 | GAMCO INVESTORS, INC. ET AL | TENNANT CO | 338,000 | 1.8% | EDGAR |
| SC 13G/A | 2009-02-13 | KEELEY ASSET MANAGEMENT CORP | TENNANT CO | 2,002,900 | 11.0% | EDGAR |
| SC 13G | 2009-02-12 | NEUBERGER BERMAN INC | TENNANT CO | 1,194,260 | 6.5% | EDGAR |
| SC 13G/A | 2009-02-06 | VANGUARD FIDUCIARY TRUST CO | TENNANT CO | 1,706,883 | 9.4% | EDGAR |
| SC 13G/A | 2009-01-30 | ROYCE & ASSOCIATES LLC | TENNANT CO | 2,252,300 | 12.3% | EDGAR |
| SC 13G/A | 2008-06-10 | KEELEY ASSET MANAGEMENT CORP | TENNANT CO | 1,856,230 | 10.0% | EDGAR |
| SC 13G/A | 2008-05-07 | ROYCE & ASSOCIATES LLC | TENNANT CO | 1,922,100 | 10.4% | EDGAR |
| SC 13G/A | 2008-02-14 | WELLINGTON MANAGEMENT CO LLP | TENNANT CO | 413,500 | 2.2% | EDGAR |
| SC 13G/A | 2008-02-14 | VANGUARD FIDUCIARY TRUST CO | TENNANT CO | 1,905,080 | 10.2% | EDGAR |
| SC 13G | 2008-02-14 | KEELEY ASSET MANAGEMENT CORP | TENNANT CO | 1,561,340 | 8.4% | EDGAR |
| SC 13G/A | 2008-01-31 | ROYCE & ASSOCIATES LLC | TENNANT CO | 1,821,800 | 9.8% | EDGAR |
| SC 13G | 2007-02-14 | WELLINGTON MANAGEMENT CO LLP | TENNANT CO | 974,056 | 5.2% | EDGAR |