Tetra Tech TTEK Insider Ownership

NASDAQ TTEK
$33.12 -0.60 (-1.78%)
At close: Oct 2, 2026 · 4:00 PM EDT

Insider Holdings by Owner

3.92Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
1.52%
▲+0.0009% pp QoQ
Shares Held by Insiders
3.92Mn
filed for Sep 2026
▲+0.06% QoQ
Shares Outstanding
258.15Mn
258,151,000 shares
Direct Holdings
3.92Mn
Indirect: 0
Net Shares Traded (QoQ)
+2.30K
net buying in Sep 2026
Insiders Holding Shares
25
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

Quarter ending 30 Sep, 2026

As of October 03, 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).

Form 4 Holdings

Insiders Holding TTEK

Insiders 25
Shares held 3.92Mn
Of outstanding 1.52%
# 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.

Form 4 Filings

3,959 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
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