As of September 12, 2026, the three largest insider holders of TTEK are William R Brownlie (Svp, Chief Engineer, 833.75K shares), J Christopher Lewis (Director, 565.19K shares), Craig L Christensen (Svp, Cio, 355.54K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | William R Brownlie | Svp, Chief Engineer | 833,750 | 0 | 833,750 | 21.3% | 21 Mar, 2022 |
| 2 | J Christopher Lewis | Director | 565,186 | 0 | 565,186 | 14.4% | 16 Dec, 2022 |
| 3 | Craig L Christensen | Svp, Cio | 355,537 | 0 | 355,537 | 9.1% | 30 Nov, 2021 |
| 4 | Richard A Lemmon | Svp, Corporate Administration | 349,365 | 0 | 349,365 | 8.9% | 08 Dec, 2021 |
| 5 | Dan L Batrack | Chairman And Ceo | 332,498 | 0 | 332,498 | 8.5% | 02 Dec, 2025 |
| 6 | Leslie L Shoemaker | Evp, Chief Sustainability | 325,821 | 0 | 325,821 | 8.3% | 02 Dec, 2025 |
| 7 | Kimberly E Ritrievi | Director | 192,259 | 0 | 192,259 | 4.9% | 18 Mar, 2026 |
| 8 | Steven M Burdick | Evp, Cfo | 138,251 | 0 | 138,251 | 3.5% | 06 Feb, 2026 |
| 9 | Bernard Teufele | Svp, Canada And South America | 125,654 | 0 | 125,654 | 3.2% | 24 Nov, 2021 |
| 10 | Derek G Amidon | Svp, Comm./Int'L Svcs. Group | 108,799 | 0 | 108,799 | 2.8% | 22 Nov, 2022 |
| 11 | J Kenneth Thompson | Director | 107,275 | 0 | 107,275 | 2.7% | 16 Feb, 2024 |
| 12 | Joanne M Maguire | Director | 97,785 | 0 | 97,785 | 2.5% | 02 Oct, 2024 |
| 13 | Preston Hopson | Evp, Chief Legal/Human Capital | 83,142 | 0 | 83,142 | 2.1% | 02 Dec, 2025 |
| 14 | Kirsten M Volpi | Director | 74,218 | 0 | 74,218 | 1.9% | 06 Aug, 2026 |
| 15 | Brian N Carter | Svp, Corporate Controller | 46,496 | 0 | 46,496 | 1.2% | 06 Feb, 2026 |
| 16 | Roger R Argus | President | 39,890 | 0 | 39,890 | 1.0% | 02 Dec, 2025 |
| 17 | Gary Birkenbeuel | Director | 37,725 | 0 | 37,725 | 1.0% | 15 Aug, 2025 |
| 18 | Patrick C Haden | Director | 29,902 | 0 | 29,902 | 0.8% | 21 Mar, 2022 |
| 19 | Jill Hudkins | President | 24,648 | 0 | 24,648 | 0.6% | 28 Nov, 2023 |
| 20 | Prashant Gandhi | Director | 16,553 | 0 | 16,553 | 0.4% | 02 Dec, 2025 |
| 21 | Brendan M. O'Rourke | Svp, Enterprise Risk Mgmt. | 13,125 | 0 | 13,125 | 0.3% | 31 Jan, 2022 |
| 22 | Mark A Rynning | Svp, Rs Infrastructure | 11,367 | 0 | 11,367 | 0.3% | 22 Nov, 2021 |
| 23 | Christiana Obiaya | Director | 9,666 | 0 | 9,666 | 0.2% | 20 Feb, 2026 |
| 24 | Jeffrey R Feeler | Director | 1,900 | 0 | 1,900 | 0.0% | 15 May, 2026 |
| 25 | John M. Douglas | Director | 610 | 0 | 610 | 0.0% | 03 Mar, 2025 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 04 Aug, 2026 | Kirsten M Volpi | Director | Acquired M | 2,300 | $9.59 | $22.06K | 74,218 | Direct |
| 04 Aug, 2026 | Kirsten M Volpi | Director | Disposed M | 2,300 | $0.00 | $0 | 4,000 | Direct |
| 04 Jun, 2026 | Kirsten M Volpi | Director | Acquired M | 1,700 | $9.59 | $16.30K | 71,918 | Direct |
| 04 Jun, 2026 | Kirsten M Volpi | Director | Disposed M | 1,700 | $0.00 | $0 | 6,300 | Direct |
| 15 May, 2026 | Jeffrey R Feeler | Director | Acquired P | 1,900 | $26.41 | $50.18K | 1,900 | Direct |
| 27 Apr, 2026 | Eric W Thornburg | Director | Acquired A | 1,259 | $0.00 | $0 | 1,259 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired M | 4,500 | $0.00 | $0 | 149,908 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired M | 2,250 | $0.00 | $0 | 152,158 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired M | 1,925 | $0.00 | $0 | 154,083 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired M | 2,910 | $0.00 | $0 | 156,993 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired M | 2,050 | $0.00 | $0 | 159,043 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired M | 795 | $0.00 | $0 | 159,838 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired M | 795 | $0.00 | $0 | 160,633 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired M | 1,900 | $0.00 | $0 | 162,533 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired M | 2,125 | $0.00 | $0 | 164,658 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired M | 1,718 | $0.00 | $0 | 166,376 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Acquired A | 25,883 | $0.00 | $0 | 192,259 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Disposed M | 4,500 | $0.00 | $0 | 0 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Disposed M | 2,250 | $0.00 | $0 | 2,250 | Direct |
| 16 Mar, 2026 | Kimberly E Ritrievi | Director | Disposed M | 1,925 | $0.00 | $0 | 1,925 | Direct |