Thomas South plans sale of 1,800 Northern Trust shares

Northern Trust Corporation (NTRS) has a notice filed under Rule 144 for a planned sale of restricted or control securities.

Rhea-AI Filing Summary

Northern Trust Corporation (NTRS) has a notice filed under Rule 144 for a planned sale of restricted or control securities. The notice relates to the potential sale of 1,800 shares of Northern Trust common stock for the account of Thomas A. South, with Northern Trust Securities, Inc. listed as broker and NASDAQ as the trading market.

The filing lists an aggregate market value of 333,720 for the shares and states that total common shares outstanding are 182,955,653. The shares to be sold are identified as vested shares acquired from the issuer on February 18, 2025. The notice is signed by David A. Serna as Attorney-in-Fact for Thomas A. South.

Key Figures

Shares to be sold: 1,800 shares Aggregate market value: 333,720 Shares outstanding: 182,955,653 shares +2 more

5 metrics

Shares to be sold 1,800 shares Common stock covered by the Rule 144 notice for Thomas A. South

Aggregate market value 333,720 Aggregate market value of the 1,800 shares to be sold

Shares outstanding 182,955,653 shares Total Northern Trust Corporation common shares outstanding

Acquisition date of shares 02/18/2025 Date vested shares were acquired from the issuer

Approximate date of sale 08/20/2026 Approximate date listed for the contemplated sale on NASDAQ

Key Terms

Rule 144, Attorney-in-Fact, aggregate market value, vested shares

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Attorney-in-Fact regulatory

"Signature | David A. Serna, Attorney-in-Fact for Thomas A. South"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

aggregate market value financial

"Common | Northern Trust Securities, Inc. ... | 1800 | 333720 | 182955653"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

vested shares financial

"Common | 02/18/2025 | Vested Shares | Issuer"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing for NTRS disclose about Thomas A. South?

The filing discloses that 1,800 shares of Northern Trust Corporation common stock may be sold for the account of Thomas A. South under Rule 144, with the transaction arranged through Northern Trust Securities, Inc. on the NASDAQ market.

How many NTRS shares are covered by this Form 144 notice and what is their value?

The notice covers a potential sale of 1,800 NTRS common shares with an aggregate market value of 333,720. This value reflects the filer’s estimate for the shares included in this specific Rule 144 notice.

What does the Form 144 say about Northern Trust (NTRS) shares outstanding?

The filing states that Northern Trust Corporation has 182,955,653 common shares outstanding. This figure provides context for the relative size of the 1,800-share transaction contemplated under the Rule 144 notice.

When were the NTRS shares to be sold acquired, according to the Form 144?

The shares are described as vested shares acquired from the issuer on February 18, 2025. This acquisition date and nature of acquisition help determine eligibility and holding-period requirements under Rule 144.

Who signed the NTRS Form 144 and in what capacity?

The notice is signed by David A. Serna as Attorney-in-Fact for Thomas A. South. This indicates that Serna is acting under a power of attorney to execute the Rule 144 filing on South’s behalf.

Which broker and exchange are listed for the NTRS Rule 144 sale?

The filing identifies Northern Trust Securities, Inc. as the broker and NASDAQ as the exchange where the 1,800 common shares of Northern Trust Corporation may be sold under Rule 144.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/19/2026 - 04:41 PM Accepted by SEC EDGAR 08/19/2026 - 04:41 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001751051
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Northern Trust Corporation
SEC File Number	001-36609
Address of Issuer	50 South LaSalle St Chicago ILLINOIS 60603
Phone	3126306000
Name of Person for Whose Account the Securities are To Be Sold	Thomas A South
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Affiliate

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Northern Trust Securities, Inc. 50 South LaSalle Street Chicago IL 60603	1800	333720	182955653	08/20/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	02/18/2025	Vested Shares	Issuer			1800	02/18/2025	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/19/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	David A. Serna, Attorney-in-Fact for Thomas A. South
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)