[Form 4] NORTHERN TRUST CORP Insider Trading Activity

Rhea-AI Filing Summary

Donald Thompson, a Director of Northern Trust Corporation (NTRS), reported three changes in beneficial ownership. On 09/30/2025 he acquired 278.6 shares of common stock at a reported price of $134.6 per share. On 10/01/2025 he acquired 148.84 shares at $131.2 per share. The filing also shows 1,743 shares held indirectly by a trust. The report clarifies the 278.6 and 148.84 share amounts are stock units payable 1-for-1 into common shares. The form was signed by an attorney-in-fact on 10/02/2025. The transactions are non-derivative acquisitions and reflect routine insider equity compensation conversion and trust holdings rather than open-market purchases.

Insights

Corporate Governance Analyst

Director conversions added 427.44 shares to direct holdings; trust holds 1,743 shares.

The filings show non-derivative acquisitions on 09/30/2025 and 10/01/2025 totaling 427.44 shares acquired at reported prices of $134.6 and $131.2. The report states the 278.6 and 148.84 amounts represent stock units payable 1-for-1 into common stock, indicating these are vesting/conversion events tied to compensation.

This is governance-relevant because director holdings and vesting patterns affect alignment with shareholders; however, the sizes reported are small relative to typical institutional positions, so the immediate market impact is likely limited.

Insider Transactions Specialist

Transactions are reported as acquisitions and are non-derivative; signature dated 10/02/2025.

The Form 4 lists Transaction Code V, indicating conversion/vesting of stock units into common stock. The filing explicitly labels the 1,743 shares as held indirectly by a trust. No derivative exercises, open-market buys, or sales are disclosed.

The concrete monitorable item: the filing date and signature are 10/02/2025.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Thompson Donald

(Last) (First) (Middle)

50 SOUTH LA SALLE ST

(Street)

CHICAGO IL 60603

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
NORTHERN TRUST CORP [ NTRS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
09/30/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/30/2025		A		278.6	A	$134.6	29,332.46(1)	D
Common Stock	10/01/2025		A		148.84	A	$131.2	29,481.3(1)	D
Common Stock								1,743	I	By Trust

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents stock units payable automatically on a 1-for-1 basis in shares of the Corporation's common stock.

Remarks:

	David A. Serna, Attorney-in-Fact for Donald Thompson	10/02/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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