As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

  5/3/24  Tetra Tech Inc.                   10-Q        3/31/24   95:8.1M                                                            
  5/1/24  Tetra Tech Inc.                   8-K:2,8,9    5/1/24   11:532K                                   Toppan Merrill/FA        
 4/30/24  Hudkins Jill                      4          Officer²    1:10K  Tetra Tech Inc.                   Tetra Tech Inc.          
  4/5/24  SEC                               UPLOAD¶      5/3/24    2:39K  Tetra Tech Inc.                                            
  4/5/24  Tetra Tech Inc.                   CORRESP¶     5/3/24    1:18K                                    Toppan Merrill/FA        
 3/13/24‡ SEC                               UPLOAD¶      5/3/24    2:43K  Tetra Tech Inc.                                            
  3/1/24  Tetra Tech Inc.                   8-K:5       2/29/24   10:201K                                   Toppan Merrill/FA        
  3/1/24  Tetra Tech Inc.                   CORRESP¶     5/3/24    1:70K                                    Toppan Merrill/FA        
 2/22/24  Burdick Steven M                  4          Officer²    1:4K   Tetra Tech Inc.                   Tetra Tech Inc.          
 2/22/24  Batrack Dan L                     4          Dir.,Off.²  1:4K   Tetra Tech Inc.                   Tetra Tech Inc.          
 2/22/24  Burdick Steven M                  144                    1:6K   Tetra Tech Inc.                   E TRADE Fin’l… Office/FA 
 2/16/24  Thompson J Kenneth                4          Director²   1:4K   Tetra Tech Inc.                   Tetra Tech Inc.          
 2/14/24  Thompson J Kenneth                144                    1:6K   Tetra Tech Inc.                   E TRADE Fin’l… Office/FA 
 2/14/24  Alliancebernstein L.P.            SC 13G/A               1:16K  Tetra Tech Inc.                   Bertan Laurence H/FA     
 2/13/24  Carter Brian N                    4          Officer²    1:6K   Tetra Tech Inc.                   Tetra Tech Inc.          
 2/13/24  Vanguard Group Inc.               SC 13G/A               1:12K  Tetra Tech Inc.                   Toppan Merrill/FA        
  2/9/24  Carter Brian N                    144                    1:5K   Tetra Tech Inc.                   E TRADE Fin’l… Office/FA 
  2/7/24  Volpi Kirsten M                   4          Director²   1:5K   Tetra Tech Inc.                   Tetra Tech Inc.          
  2/7/24  Burdick Steven M                  4          Officer²    1:4K   Tetra Tech Inc.                   Tetra Tech Inc.          
  2/7/24  Thompson J Kenneth                4          Director²   1:9K   Tetra Tech Inc.                   Tetra Tech Inc.          

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‡	A non-Insider-Ownership Filing that was accepted after the SEC “closed” at 5:30:00pm ET.  The legal “Filed As Of” date may be the next, or another, day.
¹	Filing/Form Types:  /A
	4	Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 4 { The Filer is an Insider² of the Issuer }.
	8-K	Current Report — Form 8-K { Item 1: Business & Operations;  2: Financial Info;  3: Securities & Trading;  4: Accountants & Accounting;  5: Governance & Management;  6: Asset-Backed Securities;  7: Disclosures;  8: Events;  9: Financials }.
	10-Q	Quarterly Report — Form 10-Q.
	144	Notice of a Proposed Sale of Securities by an Insider — Form 144 { The Filer is an Insider² of the Issuer }.
	CORRESP	Comment-Response or Other Letter to the SEC.
	SC 13G	Statement of Acquisition of Beneficial Ownership by a “Passive” Investor — Schedule 13G.
	UPLOAD	Comment or Other Letter from the SEC.
	/A	Amendment to, or Amended version of, a previous Filing of this Type.
	¶	This Filing contains a delayed-release Document.
²	Insider:  The Filer is a Director, Officer, 10% Owner and/or Other “insider” of the Issuer.