Security key
88162G103
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 241,480,335
- Total 13F value
- $8,104,063,059
- Share change
- -4,738,705
- Put/Call ratio
- 1280%
- SEC-reported price per share
- $33.54
- Number of holders
- 605
- Value change
- -$158,009,109
- Number of buys
- 252
- Number of sells
- 321
- 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
Q4 2025
Institutions
605
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
19 Nov 2025
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%
PICTET ASSET MANAGEMENT SA
4.9%
Gary Birkenbeuel
0.02%
Prashant Gandhi
0.01%
VANGUARD GROUP INC
10%
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
|
$851,390,862
25,506,017 shares
|
— | 30 Sep 2025 |
| PICTET ASSET MANAGEMENT SA |
13D/G
|
4.9%
|
$434,148,391
13,006,243 shares
|
-$48,471,298 | 16 Oct 2025 |
| 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 |
| VANGUARD GROUP INC |
13F
Company
|
10%
|
$877,951,480
26,301,722 shares
|
— | 30 Sep 2025 |
| Pictet Asset Management Holding SA |
13F
Company
|
5.4%
|
$473,641,448
14,189,245 shares
|
— | 30 Sep 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 Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
605
Shares
241,480,335
Rows available
605
| 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 Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
591
Q4 2025 holders
605
Holder diff
14
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|