NTRS insider filing: Director purchase of 69.41 shares at $131.2

Rhea-AI Filing Summary

Martin P. Slark, a Director of Northern Trust Corp (NTRS), reported a transaction dated 10/01/2025 on Form 4. The filing shows a non-derivative acquisition (Code A) of 69.41 shares of the company's common stock at a reported price of $131.2 per share. Following the reported transaction, the form lists 21,179.33 shares beneficially owned in a direct capacity and 4,769 shares held indirectly by trust. The filing includes a footnote stating these are stock units payable on a one-for-one basis in shares of common stock. The Form 4 is signed by an attorney-in-fact on behalf of Mr. Slark and dated 10/02/2025.

Positive

• Compliance: Reporting person filed Form 4 and disclosed the transaction, meeting Section 16 filing requirements
• Incremental director ownership: Director acquired 69.41 shares, increasing direct beneficial holdings to 21,179.33 shares

Negative

• None.

Insights

Insider Transactions Analyst

Director reported a small open-market acquisition and holds ~21.2K shares.

The Form 4 discloses a non-derivative acquisition of 69.41 common shares at $131.2 per share on 10/01/2025.

The reporter's total beneficial ownership is shown as 21,179.33 shares directly and 4,769 shares indirectly via a trust, with a note that certain units convert 1-for-1 into common shares.

This filing documents routine insider activity required under Section 16; the size of the acquisition relative to total holdings is explicit in the form but no further corporate actions or changes are disclosed.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider SLARK MARTIN P

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	69.41	$131.20	$9K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 21,179.33 shares (Direct); Common Stock — 4,769 shares (Indirect, By Trust)

Footnotes (1)

1. [object Object]

Form 4 Insider Transactions: What Each Field Means →

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
Estimated average burden
hours per response:			0.5

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^*

SLARK MARTIN P

(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)
10/01/2025

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	10/01/2025		A		69.41	A	$131.2	21,179.33(1)	D
Common Stock								4,769	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 Martin P. Slark	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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transaction did Martin P. Slark report on Form 4 for NTRS?

He reported a non-derivative acquisition of 69.41 common shares on 10/01/2025 at a price of $131.2 per share.

How many NTRS shares does the reporting person beneficially own after the transaction?

The form lists 21,179.33 shares owned directly following the reported transaction and 4,769 shares indirectly by trust.

Does the filing indicate any derivative securities or options?

No derivative securities or options are reported in Table II; the filing only shows a non-derivative common stock acquisition.

What does the footnote about stock units state?

The footnote states these are stock units payable automatically on a 1-for-1 basis in shares of the corporation's common stock.

Who signed the Form 4 and when?

The Form 4 is signed by David A. Serna, Attorney-in-Fact for Martin P. Slark, dated 10/02/2025.