Signing Day Sports (SGN) director stake converted into BlockchAIn shares

Rhea-AI Filing Summary

Signing Day Sports director Gregory Economou returned his company equity to the issuer as part of a merger closing. On March 16, 2026, he disposed of 90,919 shares of common stock and a stock option covering 500 shares back to Signing Day Sports. Under a Business Combination Agreement with BlockchAIn Digital Infrastructure, Inc., his Signing Day Sports shares were exchanged into BlockchAIn common shares at a ratio of 0.09334 BlockchAIn share for each company share, valued at $4.60 per BlockchAIn share. His option became fully vested and was converted into an option to purchase 47 BlockchAIn common shares at an exercise price of $1,285.62 per share.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Economou Gregory

Role Director

Type	Security	Shares	Price	Value
Disposition	Stock Option (right to buy)	500	$0.00	--
Disposition	Common Stock	90,919	$0.00	--

Holdings After Transaction: Stock Option (right to buy) — 0 shares (Direct); Common Stock — 0 shares (Direct)

Footnotes (1)

1. Pursuant to the Business Combination Agreement, dated as of May 27, 2025, by and among Signing Day Sports, Inc., a Delaware corporation (the "Registrant"), One Blockchain LLC, a Delaware limited liability company, BlockchAIn Digital Infrastructure, Inc., a Delaware corporation ("BlockchAIn"), BCDI Merger Sub I Inc., a Delaware corporation, and BCDI Merger Sub II LLC, a Delaware limited liability company, as amended (the "Business Combination Agreement"), on the date of the closing (the "Closing") of the transactions contemplated by the Business Combination Agreement, or March 16, 2026 (the "Closing Date"), the reporting person received 0.09334 common shares of BlockchAIn for every share of common stock of the Registrant held by the reporting person, subject to rounding adjustments, having a market value of $4.60 per share based on the first reported sale price of the common stock of BlockchAIn on the NYSE American LLC after the Closing, which was reported on March 17, 2026. Pursuant to the terms of the Business Combination Agreement, on the Closing Date, the reporting person's option, which provided for vesting as to 1/12 of the shares of the Registrant's common stock subject to the option on the 9th day of each August, November, February, or May, that follows May 9, 2023, immediately became fully vested, was assumed by BlockchAIn, and was automatically converted into an option to purchase 47 common shares of BlockchAIn exercisable for $1,285.62 per share.

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

X

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Economou Gregory

(Last) (First) (Middle)

C/O SIGNING DAY SPORTS, INC.

8355 EAST HARTFORD RD., SUITE 100

(Street)

SCOTTSDALE ARIZONA 85255

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Signing Day Sports, Inc. [ SGN ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

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

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

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

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	03/16/2026		D		90,919	D	(1)	0	D

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
Stock Option (right to buy)	$120	03/16/2026		D			500	(2)	05/09/2033	Common Stock	500	(2)	0	D

Explanation of Responses:

1. Pursuant to the Business Combination Agreement, dated as of May 27, 2025, by and among Signing Day Sports, Inc., a Delaware corporation (the "Registrant"), One Blockchain LLC, a Delaware limited liability company, BlockchAIn Digital Infrastructure, Inc., a Delaware corporation ("BlockchAIn"), BCDI Merger Sub I Inc., a Delaware corporation, and BCDI Merger Sub II LLC, a Delaware limited liability company, as amended (the "Business Combination Agreement"), on the date of the closing (the "Closing") of the transactions contemplated by the Business Combination Agreement, or March 16, 2026 (the "Closing Date"), the reporting person received 0.09334 common shares of BlockchAIn for every share of common stock of the Registrant held by the reporting person, subject to rounding adjustments, having a market value of $4.60 per share based on the first reported sale price of the common stock of BlockchAIn on the NYSE American LLC after the Closing, which was reported on March 17, 2026.

2. Pursuant to the terms of the Business Combination Agreement, on the Closing Date, the reporting person's option, which provided for vesting as to 1/12 of the shares of the Registrant's common stock subject to the option on the 9th day of each August, November, February, or May, that follows May 9, 2023, immediately became fully vested, was assumed by BlockchAIn, and was automatically converted into an option to purchase 47 common shares of BlockchAIn exercisable for $1,285.62 per share.

	/s/ Gregory Economou	03/18/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Gregory Economou report for Signing Day Sports (SGN)?

Gregory Economou reported disposing of 90,919 shares of Signing Day Sports common stock and a stock option for 500 shares back to the issuer. The disposition occurred on March 16, 2026, in connection with a Business Combination Agreement involving BlockchAIn Digital Infrastructure, Inc.

Why did the SGN director’s shares and options get disposed to the issuer?

The disposals occurred under a Business Combination Agreement among Signing Day Sports and BlockchAIn Digital Infrastructure, Inc. At the March 16, 2026 closing, Economou’s Signing Day Sports equity was exchanged and converted into BlockchAIn securities as part of the agreed merger structure.

What did the Signing Day Sports (SGN) director receive for his common shares?

For each Signing Day Sports common share, Gregory Economou received 0.09334 BlockchAIn common share, subject to rounding adjustments. The BlockchAIn shares were valued at $4.60 per share, based on the first reported sale price after the transaction closing on the NYSE American LLC.

How were Gregory Economou’s SGN stock options treated in the merger?

On the March 16, 2026 closing date, Economou’s Signing Day Sports option covering 500 shares became fully vested, was assumed by BlockchAIn, and automatically converted into an option to purchase 47 BlockchAIn common shares at an exercise price of $1,285.62 per share under the Business Combination Agreement.

Did the SGN director retain any Signing Day Sports shares after the reported transaction?

Following the March 16, 2026 disposition transactions, the Form 4 shows Gregory Economou holding zero Signing Day Sports common shares and zero related stock option units. His economic exposure shifted to BlockchAIn securities received and options assumed through the Business Combination Agreement.

What is the effective date of the Signing Day Sports and BlockchAIn business combination for this insider?

For Gregory Economou, the effective date was March 16, 2026, the closing date of the Business Combination Agreement. On that date, his Signing Day Sports common stock and options were exchanged and converted into BlockchAIn common shares and options on the specified terms.