[144] SEI Investments Co SEC Filing

Rhea-AI Filing Summary

Form 4 filed on 31 Jul 2025 discloses that Seaport Global Asset Management LLC ("SGAM"), a 10% owner of ScanTech AI Systems Inc. (STAI), sold a total of 115,000 common shares over two consecutive trading days:

• 29 Jul 2025: 5,000 shares sold at $1.01
• 30 Jul 2025: 110,000 shares sold at $0.948

Following the dispositions, SGAM reports 16,542,973 shares held indirectly through Seaport Group SIBS LLC. No derivative transactions or new acquisitions were reported.

The transactions reflect a 0.7% reduction in the reporting person’s previously disclosed stake and could signal limited profit-taking rather than a strategic exit.

Positive

• None.

Negative

• 10% owner SGAM sold 115,000 STAI shares, decreasing its stake to 16.54 m shares and signaling slight insider selling pressure.

Insights

Financial Analyst

TL;DR: Minor insider sale (0.7% of stake) at ~$1; modestly negative signal, unlikely to shift valuation.

The disposal of 115k shares by SGAM trims its position to 16.54 m shares. The dollar value (≈$109k) is small relative to the holding and provides limited insight into future fundamentals. Absence of derivative activity or larger block sales suggests routine portfolio management. Market impact should be minimal, yet insider selling by a 10% owner typically acts as a mild sentiment headwind.

Portfolio Manager

TL;DR: Transaction size insignificant versus position; I view it as neutral for portfolio decisions.

Liquidity events like this, involving <1% of ownership, rarely alter supply-demand dynamics. Without accompanying corporate news, I classify the filing as not impactful. I will monitor for follow-on sales that might indicate a pattern but see no reason to adjust weighting today.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	Charles Schwab & Co., Inc. 3000 Schwab Way Westlake TX 76262	12500	1106317.00	123625060	07/31/2025	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	07/31/2025	Employee Stock Option Exercise - See Remarks	SEI INVESTMENTS CO			12500	07/31/2025	Broker Payment for Cashless Exercise

* 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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
MICHAEL PETERSON 1 FREEDOM VALLEY DRIVE OAKS PA 19456-1100	SEI INVESTMENTS CO	05/15/2025	50000	4213390.00

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

How many STAI shares did Seaport Global sell?

The Form 4 shows sales totaling 115,000 common shares.

At what prices were the STAI shares sold?

Shares were sold at $1.01 on 29 Jul 2025 and $0.948 on 30 Jul 2025.

What is Seaport Global's remaining STAI ownership?

After the transactions, Seaport Global reports 16,542,973 shares held indirectly.

Does the Form 4 report any derivative activity?

No. Table II shows no derivative securities acquired or disposed of.

Is the insider sale considered significant?

The sale represents roughly 0.7% of the reporting owner's prior stake, generally viewed as modest.