Comparable stake leader
BlackRock, Inc.
SEC ownership of TETRA TECH INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000831641.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- TTEK on Nasdaq
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000831641
- Issuer location
- Pasadena, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of TETRA TECH INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13D/G
13F
3/4/5
Lead comparable stake: 9.7%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 9.7%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
9.7%
VANGUARD CAPITAL MANAGEMENT LLC
5.2%
PICTET ASSET MANAGEMENT SA
4.9%
Kimberly E. Ritrievi
0.07%
Gary Birkenbeuel
0.02%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13D/G
13F
Company
|
9.7%
|
$819,843,350
26,026,773 shares
|
$0 | 31 Dec 2024 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.2%
|
$411,344,503
13,656,856 shares
|
$0 | 31 Mar 2026 |
| PICTET ASSET MANAGEMENT SA |
13D/G
|
4.9%
|
$434,148,391
13,006,243 shares
|
-$48,471,298 | 16 Oct 2025 |
| Kimberly E. Ritrievi |
3/4/5
Director
|
0.07%
|
$6,898,137
192,259 shares
mixed-class rows
|
— | 16 Mar 2026 |
| Gary Birkenbeuel |
3/4/5
Director
|
0.02%
|
$1,780,711
51,032 shares
mixed-class rows
|
-$86,050 | 19 Nov 2025 |
| Prashant Gandhi |
3/4/5
Director
|
0.01%
|
$537,144
16,553 shares
|
— | 19 Nov 2025 |
| Christiana Obiaya |
3/4/5
Director
|
0%
|
$369,434
9,666 shares
|
— | 19 Feb 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
Company
|
4.8%
|
$380,809,991
12,643,094 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$437,276.
Buys
$50,179
Insiders: 1
Sells
$487,455
Insiders: 2
Net
-$437,276
Shares: -10,469
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 1,900
Shares: 12,369
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 1,900 | 0 | $50,179 | $0 | +$50,179 |
| 3-6 | 0 | 9,979 | $0 | $401,405 | -$401,405 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 2,390 | $0 | $86,050 | -$86,050 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 27 reporting-owner rows connected to TETRA TECH INC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
27
Largest Forms 3/4/5 holder
Dan L. Batrack
Net 12M change
-$437,276
Latest report
04 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Dan L. Batrack | Chairman and CEO, Director | $14,197,658 | Mixed | 19 Nov 2025 | ||
| William R. Brownlie | SVP, Chief Engineer | $14,143,678 | Mixed | 02 Oct 2022 | ||
| Leslie L. Shoemaker | EVP, Chief Sustainability | $11,696,970 | Mixed | 19 Nov 2025 | ||
| J. Christopher Lewis | Director | $9,582,943 | Mixed | 14 Dec 2022 | ||
| Kimberly E. Ritrievi | Director | $6,898,137 | Mixed | 16 Mar 2026 | ||
| Craig L. Christensen | Svp, Cio | $6,031,748 | Mixed | 02 Oct 2022 | ||
| Richard A. Lemmon | SVP, Corporate Administration | $5,930,744 | Mixed | 02 Oct 2022 | ||
| Steven M. Burdick | Evp, Cfo | $5,090,642 | Mixed | 06 Feb 2026 | ||
| Joanne M. Maguire | Director | $4,563,437 | Mixed | 30 Sep 2024 | ||
| Preston Hopson | EVP, Chief Legal/Human Capital | $3,228,527 | Mixed | 19 Nov 2025 | ||
| Kirsten M. Volpi | Director | $2,252,480 | Mixed | 04 Jun 2026 | ||
| Bernard Teufele | SVP, Canada and South America | $2,136,148 | Mixed | 02 Oct 2022 | ||
| Brian N. Carter | SVP, Corporate Controller | $2,059,172 | -$401,405 | -16% | Mixed | 04 Feb 2026 |
| Derek G. Amidon | SVP, Comm./Int'l Svcs. Group | $2,054,737 | Mixed | 01 Oct 2023 | ||
| J. Kenneth Thompson | Director | $2,017,188 | Mixed | 14 Feb 2024 | ||
| Gary Birkenbeuel | Director | $1,780,711 | -$86,050 | -4.6% | Mixed | 19 Nov 2025 |
| Roger R. Argus | President and CEO | $1,715,381 | Mixed | 19 Feb 2026 | ||
| Jill Hudkins | President | $989,632 | Mixed | 27 Nov 2023 | ||
| Prashant Gandhi | Director | $537,144 | Mixed | 19 Nov 2025 | ||
| Patrick C. Haden | Director | $507,006 | Mixed | 17 Mar 2022 |
Recent insider transactions for TETRA TECH INC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Kirsten M. Volpi | TTEK | COMMON STOCK | Options Exercise | 2.42% | 1,700 | 71,918 | 04 Jun 2026 | Direct | ||
| Kirsten M. Volpi | TTEK | STOCK OPTION (RIGHT TO BUY) | Options Exercise | -21.2% | -1,700 | 6,300 | 04 Jun 2026 | Direct | ||
| Jeffrey R. Feeler | TTEK | COMMON STOCK | Purchase | $50,179 | $26.41 | 1,900 | 1,900 | 15 May 2026 | Direct | |
| Eric W. Thornburg | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Award | 1,259 | 1,259 | 27 Apr 2026 | Direct | |||
| Kimberly E. Ritrievi | TTEK | COMMON STOCK | Award | 15.6% | 25,883 | 192,259 | 16 Mar 2026 | Direct | ||
| Kimberly E. Ritrievi | TTEK | COMMON STOCK | Options Exercise | 14.4% | 20,968 | 166,376 | 16 Mar 2026 | Direct | ||
| Kimberly E. Ritrievi | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -100% | -20,968 | 0 | 16 Mar 2026 | Direct | ||
| Christiana Obiaya | TTEK | COMMON STOCK | Options Exercise | 5.4% | 495 | 9,666 | 19 Feb 2026 | Direct | ||
| Christiana Obiaya | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -100% | -495 | 0 | 19 Feb 2026 | Direct | ||
| Roger R. Argus | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Award | 28,174 | 28,174 | 19 Feb 2026 | Direct | |||
| Kirsten M. Volpi | TTEK | COMMON STOCK | Options Exercise | 1.44% | 1,000 | 70,218 | 10 Feb 2026 | Direct | ||
| Kirsten M. Volpi | TTEK | STOCK OPTION (RIGHT TO BUY) | Options Exercise | -11.1% | -1,000 | 8,000 | 10 Feb 2026 | Direct | ||
| Steven M. Burdick | TTEK | COMMON STOCK | Gift | -7.43% | -11,100 | 138,251 | 06 Feb 2026 | Direct | ||
| Brian N. Carter | TTEK | COMMON STOCK | Sale | -17.7% | $401,405 | $40.22 | -9,979 | 46,496 | 04 Feb 2026 | Direct |
| M. Susan Hardwick | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Award | 1,754 | 1,754 | 26 Jan 2026 | Direct | |||
| Jeffrey R. Feeler | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Award | 1,754 | 1,754 | 26 Jan 2026 | Direct | |||
| Gary Birkenbeuel | TTEK | COMMON STOCK | Award | 9.43% | 4,397 | 51,032 | 12 Jan 2026 | Direct | ||
| Gary Birkenbeuel | TTEK | COMMON STOCK | Options Exercise | 3.53% | 1,590 | 46,635 | 12 Jan 2026 | Direct | ||
| Gary Birkenbeuel | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -100% | -1,590 | 0 | 12 Jan 2026 | Direct | ||
| Kimberly E. Ritrievi | TTEK | COMMON STOCK | Award | 1.54% | 2,208 | 145,408 | 12 Jan 2026 | Direct | ||
| Kirsten M. Volpi | TTEK | COMMON STOCK | Options Exercise | 2.58% | 1,718 | 68,218 | 30 Nov 2025 | Direct | ||
| Kirsten M. Volpi | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -100% | -1,718 | 0 | 30 Nov 2025 | Direct | ||
| Leslie L. Shoemaker | TTEK | COMMON STOCK | Tax liability | -1.12% | -3,707 | 325,821 | 30 Nov 2025 | Direct | ||
| Leslie L. Shoemaker | TTEK | COMMON STOCK | Options Exercise | 2.08% | 6,717 | 329,528 | 30 Nov 2025 | Direct | ||
| Leslie L. Shoemaker | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -52.5% | -6,717 | 6,070 | 30 Nov 2025 | Direct | ||
| Christiana Obiaya | TTEK | COMMON STOCK | Options Exercise | 23% | 1,718 | 9,171 | 30 Nov 2025 | Direct | ||
| Christiana Obiaya | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -100% | -1,718 | 0 | 30 Nov 2025 | Direct | ||
| Preston Hopson | TTEK | COMMON STOCK | Tax liability | -2.4% | -2,044 | 83,142 | 30 Nov 2025 | Direct | ||
| Preston Hopson | TTEK | COMMON STOCK | Options Exercise | 6.49% | 5,190 | 85,186 | 30 Nov 2025 | Direct | ||
| Preston Hopson | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -48.7% | -5,190 | 5,460 | 30 Nov 2025 | Direct | ||
| Prashant Gandhi | TTEK | COMMON STOCK | Options Exercise | 11.6% | 1,718 | 16,553 | 30 Nov 2025 | Direct | ||
| Prashant Gandhi | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -100% | -1,718 | 0 | 30 Nov 2025 | Direct | ||
| Brian N. Carter | TTEK | COMMON STOCK | Tax liability | -2.59% | -1,500 | 56,475 | 30 Nov 2025 | Direct | ||
| Brian N. Carter | TTEK | COMMON STOCK | Options Exercise | 4.98% | 2,748 | 57,975 | 30 Nov 2025 | Direct | ||
| Brian N. Carter | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -47.6% | -2,748 | 3,030 | 30 Nov 2025 | Direct | ||
| Steven M. Burdick | TTEK | COMMON STOCK | Tax liability | -2.64% | -4,044 | 149,219 | 30 Nov 2025 | Direct | ||
| Steven M. Burdick | TTEK | COMMON STOCK | Options Exercise | 5.02% | 7,327 | 153,263 | 30 Nov 2025 | Direct | ||
| Steven M. Burdick | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -50.1% | -7,327 | 7,285 | 30 Nov 2025 | Direct | ||
| Roger R. Argus | TTEK | COMMON STOCK | Tax liability | -6.7% | -2,865 | 39,890 | 30 Nov 2025 | Direct | ||
| Roger R. Argus | TTEK | COMMON STOCK | Options Exercise | 13.8% | 5,190 | 42,755 | 30 Nov 2025 | Direct | ||
| Roger R. Argus | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -48.7% | -5,190 | 5,460 | 30 Nov 2025 | Direct | ||
| Dan L. Batrack | TTEK | COMMON STOCK | Tax liability | -6.31% | -22,396 | 332,498 | 30 Nov 2025 | Direct | ||
| Dan L. Batrack | TTEK | COMMON STOCK | Options Exercise | 12.9% | 40,585 | 354,894 | 30 Nov 2025 | Direct | ||
| Dan L. Batrack | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Options Exercise | -48.8% | -40,585 | 42,505 | 30 Nov 2025 | Direct | ||
| Kirsten M. Volpi | TTEK | COMMON STOCK | Options Exercise | 1.47% | 1,000 | 69,218 | 28 Nov 2025 | Direct | ||
| Kirsten M. Volpi | TTEK | STOCK OPTION (RIGHT TO BUY) | Options Exercise | -10% | -1,000 | 9,000 | 28 Nov 2025 | Direct | ||
| Kimberly E. Ritrievi | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Award | 1,964 | 1,964 | 19 Nov 2025 | Direct | |||
| Kirsten M. Volpi | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Award | 1,964 | 1,964 | 19 Nov 2025 | Direct | |||
| Leslie L. Shoemaker | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Award | 19,641 | 19,641 | 19 Nov 2025 | Direct | |||
| Christiana Obiaya | TTEK | RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) | Award | 1,964 | 1,964 | 19 Nov 2025 | Direct |
* marks a reported price that did not pass the local price check.