Mostapha Tahiri

CIK: 0001818588

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)2 (12.5%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)4 (25.0%)

Compensation grants

Other (G, F, J, C, D, …)10 (62.5%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

STT

STATE STREET CORP

Officer

Discretionary Trading P&L

Holdings

Transaction History (16 total)

STT
STATE STREET CORP
Aug 14, 2026
Tax Payment(F)
Direct
54 shares at avg. $191.74$10K
STT
STATE STREET CORP
May 15, 2026
Tax Payment(F)
Direct
91 shares at avg. $152.85$14K
STT
STATE STREET CORP
Apr 22, 2026
Sale(S)
Direct
9.6K shares at avg. $152.93$1.5M
STT
STATE STREET CORP
Feb 26, 2026
Award(A)
Direct
14.3K shares-
STT
STATE STREET CORP
Feb 13, 2026
Award(A)
Direct
10.2K shares-
STT
STATE STREET CORP
Feb 13, 2026
Tax Payment(F)
Direct
2.3K shares at avg. $127.97$290K
STT
STATE STREET CORP
Feb 13, 2026
Tax Payment(F)
Direct
1.6K shares at avg. $127.97$210K
STT
STATE STREET CORP
Nov 14, 2025
Tax Payment(F)
Direct
74 shares at avg. $116.84$9K
STT
STATE STREET CORP
Aug 15, 2025
Tax Payment(F)
Direct
70 shares at avg. $111.07$8K
STT
STATE STREET CORP
May 15, 2025
Tax Payment(F)
Direct
50 shares at avg. $98.20$5K
STT
STATE STREET CORP
May 2, 2025
Sale(S)
Direct
4K shares at avg. $90.43$361K
STT
STATE STREET CORP
Feb 28, 2025
Award(A)
Direct
15.8K shares-
STT
STATE STREET CORP
Feb 15, 2025
Tax Payment(F)
Direct
415 shares at avg. $99.16$41K
STT
STATE STREET CORP
Feb 15, 2025
Tax Payment(F)
Direct
685 shares at avg. $99.16$68K
STT
STATE STREET CORP
Feb 15, 2025
Award(A)
Direct
5.1K shares-
STT
STATE STREET CORP
Nov 15, 2024
Tax Payment(F)
Direct
69 shares at avg. $95.48$7K

		Type	Shares	Price		Ownership
Aug 14, 2026	STT STATE STREET CORP	Tax Payment(F)	54	$191.74	$10,354	Direct
May 15, 2026	STT STATE STREET CORP	Tax Payment(F)	91	$152.85	$13,909	Direct
Apr 22, 2026	STT STATE STREET CORP	Sale(S)	9,611	$152.93	$1,469,810	Direct
Feb 26, 2026	STT STATE STREET CORP	Award(A)	14,259	-	$0	Direct
Feb 13, 2026	STT STATE STREET CORP	Award(A)	10,193	-	$0	Direct
Feb 13, 2026	STT STATE STREET CORP	Tax Payment(F)	2,269	$127.97	$290,364	Direct
Feb 13, 2026	STT STATE STREET CORP	Tax Payment(F)	1,639	$127.97	$209,743	Direct
Nov 14, 2025	STT STATE STREET CORP	Tax Payment(F)	74	$116.84	$8,646	Direct
Aug 15, 2025	STT STATE STREET CORP	Tax Payment(F)	70	$111.07	$7,775	Direct
May 15, 2025	STT STATE STREET CORP	Tax Payment(F)	50	$98.20	$4,910	Direct
May 2, 2025	STT STATE STREET CORP	Sale(S)	3,989	$90.43	$360,725	Direct
Feb 28, 2025	STT STATE STREET CORP	Award(A)	15,811	-	-	Direct
Feb 15, 2025	STT STATE STREET CORP	Tax Payment(F)	415	$99.16	$41,151	Direct
Feb 15, 2025	STT STATE STREET CORP	Tax Payment(F)	685	$99.16	$67,925	Direct
Feb 15, 2025	STT STATE STREET CORP	Award(A)	5,111	-	-	Direct
Nov 15, 2024	STT STATE STREET CORP	Tax Payment(F)	69	$95.48	$6,588	Direct

1-16 of 16 transactions

About TAHIRI MOSTAPHA

TAHIRI MOSTAPHA (SEC CIK 0001818588) files insider reports with the SEC as EVP and COO of STATE STREET CORP (STT).

Signal8 holds 12 ownership filings by TAHIRI MOSTAPHA, all Form 4s, filed between Nov 19, 2024 and Aug 18, 2026. Those filings report 16 transactions, from Nov 15, 2024 to Aug 14, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on TAHIRI MOSTAPHA's filings is in BOSTON, MA.

Recent filings by TAHIRI MOSTAPHA

Aug 14, 2026: Tax withholding of STT shares (Form 4, code F).
May 15, 2026: Tax withholding of STT shares (Form 4, code F).
Apr 22, 2026: Open-market sale of STT shares (Form 4, code S).
Feb 26, 2026: Grant or award of STT shares (Form 4, code A).
Feb 13, 2026: Grant or award of STT shares (Form 4, code A).

Other insiders filing for STATE STREET CORP (STT)

Hu W. Bradford, EVP and Chief Risk Officer
Vollert Karl Alexander, Director
O HANLEY RONALD P, Chairman, CEO and President
Fogarty Ann, EVP and COO
RICHARDS MICHAEL L, EVP and Chief Admin Officer
Read Craig Jack, EVP, Global Controller and CAO

How to read Form 4 transaction codes