Security key
88162G103
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 243,378,456
- Total 13F value
- $7,338,820,962
- Share change
- +1,192,211
- Put/Call ratio
- 940%
- SEC-reported price per share
- $30.12
- Number of holders
- 588
- Value change
- +$9,290,556
- Number of buys
- 263
- Number of sells
- 310
- Shares outstanding
- 261,125,354
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2026
Institutions
588
Top holders
10
TTEK full security history
Ownership snapshot
Full 13F holder table
TETRA TECH INC SEC filings
TETRA TECH INC company facts
Broader feeds
Ownership snapshot
Top reported holders of TTEK - TETRA TECH INC - Common Stock (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
VANGUARD GROUP INC
Comparable rows
15/15
Latest evidence
31 Mar 2026
13F
13D/G
3/4/5
Lead comparable stake: 9.7%
13D/G row: BlackRock, Inc.
Showing 1-6 of 15 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 9.7%.
15 of 15 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%
Principal 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 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
Company
|
9.7%
from 13D/G
|
$863,038,830
25,731,629 shares
|
— | 31 Dec 2025 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
Vanguard Capital Management
|
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 |
| Principal 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 |
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.
13F holder rows
Institutional holders as of Q1 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
588
Shares
243,378,456
Rows available
588
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2026 vs Q1 2026 Across Filers
Q1 2026 holders
588
Q1 2026 holders
588
Holder diff
0
| Investor | Q1 2026 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q1 2026 value | Value change | Value Chg % |
|---|