Latest Period
Q1 2026
Security Snapshot
TETRA TECH INC - Common Stock (TTEK) Institutional Ownership
CUSIP: 88162G103
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
586
Shares (Excl. Options)
243,377,745
Price
$30.12
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- Security type / class
- Equity / Common Stock
- Symbol
- TTEK on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 243,377,745
- Total 13F value
- $7,338,799,482
- Portfolio coverage rank
- 0.01%
- Share change
- +1,192,340
- Value change
- +$9,294,439
- Number of holders
- 586
- Shares outstanding
- 261,125,354
- SEC-reported price per share
- $27.06
- Insider filing price
- $27.06
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- TTEK - TETRA TECH INC - Common Stock is tracked under CUSIP 88162G103.
- 586 institutions reported positions in Q1 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 604 to 586 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $8,104,057,022 to $7,338,799,482.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 586 institutions filings for Q1 2026.
Security key
88162G103
Latest holder period
Q1 2026
13F holders
586
13D/G owners
3
CIK / CUSIP context first
Open Q1 2026 holders
TTEK full holder history
TETRA TECH INC SEC filings
TETRA TECH INC company facts
TETRA TECH INC insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 88162G103:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
3
Security
TTEK
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 9.7% | $819,843,350 | 26,026,773 | BlackRock, Inc. | 31 Dec 2024 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 5.2% | $411,344,503 | 13,656,856 | Vanguard Capital Management | 31 Mar 2026 | |||
| PICTET ASSET MANAGEMENT SA | 4.9% | -8% | $434,148,391 | -$48,471,298 | 13,006,243 | -10% | PICTET ASSET MANAGEMENT SA | 16 Oct 2025 |
As of 31 Mar 2026, 586 institutional investors reported holding 243,377,745 shares of TETRA TECH INC - Common Stock (TTEK). This represents 93% of the company’s total 261,125,354 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
59%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 10% | 26,790,406 | +4.1% | 0.01% | $806,927,023 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 4.8% | 12,643,094 | 0% | 0.02% | $380,809,991 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.5% | 11,709,151 | 0% | 0.01% | $352,679,628 |
| Capital International Investors | 4.4% | 11,385,267 | +26% | 0.08% | $342,924,242 |
| Pictet Asset Management Holding SA | 3.7% | 9,644,792 | -14% | 0.31% | $290,487,546 |
| STATE STREET CORP | 3.7% | 9,635,912 | +2.2% | 0.01% | $290,233,669 |
| NEUBERGER BERMAN GROUP LLC | 2.8% | 7,269,657 | -13% | 0.17% | $218,962,082 |
| SANDS CAPITAL MANAGEMENT, LLC | 2.6% | 6,658,823 | -5% | 0.79% | $200,563,749 |
| GEODE CAPITAL MANAGEMENT, LLC | 2% | 5,217,448 | +2.7% | 0.01% | $157,185,669 |
| FIL Ltd | 1.9% | 4,832,672 | +3.5% | 0.11% | $145,560,081 |
| WELLINGTON MANAGEMENT GROUP LLP | 1.8% | 4,804,049 | +355% | 0.03% | $144,697,957 |
| Amundi | 1.8% | 4,749,247 | -6.8% | 0.04% | $143,061,971 |
| Impax Asset Management Group plc | 1.5% | 3,830,074 | +19% | 0.8% | $115,361,829 |
| DIMENSIONAL FUND ADVISORS LP | 1.5% | 3,789,240 | +3.1% | 0.02% | $114,128,467 |
| FERNBRIDGE CAPITAL MANAGEMENT LP | 1.3% | 3,400,775 | +11% | 6.6% | $102,431,343 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 1.3% | 3,314,443 | 0.34% | $99,831,025 | |
| LGT Group Foundation | 1.2% | 3,161,708 | +3.3% | 1.2% | $95,230,645 |
| Invesco Ltd. | 1.1% | 2,934,900 | +14% | 0.01% | $88,399,200 |
| ALLIANCEBERNSTEIN L.P. | 1.1% | 2,807,465 | -8.8% | 0.03% | $94,162,376 |
| Ninety One UK Ltd | 1% | 2,731,721 | -2.5% | 0.19% | $82,279,416 |
| FIRST TRUST ADVISORS LP | 0.94% | 2,445,482 | +48% | 0.05% | $73,657,890 |
| Bank of New York Mellon Corp | 0.9% | 2,348,637 | -0.34% | 0.01% | $70,740,951 |
| NORTHERN TRUST CORP | 0.89% | 2,320,311 | -1.3% | 0.01% | $69,887,767 |
| M&G PLC | 0.89% | 2,318,534 | -3.6% | 0.36% | $69,556,020 |
| Robeco Schweiz AG | 0.88% | 2,287,250 | -2.6% | 1.5% | $68,891,970 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 243,377,745 | $7,338,799,482 | +$9,294,439 | $30.12 | 586 |
| 2025 Q4 | 241,480,155 | $8,104,057,022 | -$158,009,109 | $33.54 | 604 |
| 2025 Q3 | 246,126,536 | $8,216,180,579 | -$113,181,361 | $33.38 | 591 |
| 2025 Q2 | 249,240,102 | $8,933,265,268 | +$295,103,214 | $35.96 | 581 |
| 2025 Q1 | 242,378,721 | $7,091,066,618 | +$24,988,481 | $29.25 | 559 |
| 2024 Q4 | 237,165,776 | $9,448,584,728 | -$161,325,342 | $39.84 | 631 |
| 2024 Q3 | 237,811,790 | $11,214,606,811 | +$7,851,111,419 | $47.16 | 634 |
| 2024 Q2 | 48,309,758 | $9,887,096,926 | +$231,737,536 | $204.48 | 596 |
| 2024 Q1 | 46,636,359 | $8,615,755,036 | -$71,555,028 | $184.71 | 506 |
| 2023 Q4 | 47,171,610 | $7,872,855,202 | -$1,940,454 | $166.93 | 505 |
| 2023 Q3 | 46,633,786 | $7,092,827,784 | +$17,997,008 | $152.03 | 469 |
| 2023 Q2 | 46,872,573 | $7,673,008,327 | +$84,321,291 | $163.74 | 448 |
| 2023 Q1 | 46,936,638 | $6,886,742,404 | +$74,756,338 | $146.91 | 440 |
| 2022 Q4 | 46,471,935 | $6,747,450,321 | -$32,822,370 | $145.19 | 464 |
| 2022 Q3 | 45,964,934 | $5,908,292,627 | -$136,005,038 | $128.53 | 402 |
| 2022 Q2 | 46,191,800 | $6,304,563,603 | -$99,457,764 | $136.55 | 401 |
| 2022 Q1 | 47,686,242 | $7,867,067,308 | +$152,248,597 | $164.94 | 392 |
| 2021 Q4 | 46,703,352 | $7,926,326,514 | -$124,055,048 | $169.80 | 389 |
| 2021 Q3 | 47,372,911 | $7,073,314,579 | +$120,416,598 | $149.34 | 349 |
| 2021 Q2 | 46,548,461 | $5,680,116,687 | -$73,767,573 | $122.04 | 359 |
| 2021 Q1 | 47,840,078 | $6,473,266,661 | +$25,583,161 | $135.72 | 357 |
| 2020 Q4 | 46,936,862 | $5,437,819,456 | +$46,333,943 | $115.78 | 357 |
| 2020 Q3 | 46,541,184 | $4,444,481,848 | +$27,204,709 | $95.50 | 321 |
| 2020 Q2 | 46,268,189 | $3,660,977,974 | +$16,620,189 | $79.12 | 302 |
| 2020 Q1 | 46,287,273 | $3,269,443,610 | -$66,269,236 | $70.62 | 311 |