Signing Day Sports (SGN) COO exits SGN stake in BlockchAIn combination

Rhea-AI Filing Summary

Signing Day Sports, Inc. Chief Operating Officer and Secretary Craig Steven Smith reported disposing of his remaining equity in the company in connection with a Business Combination Agreement that closed on March 16, 2026.

Smith returned 28,775 shares of Common Stock and a stock option for 1,042 underlying shares to the issuer in issuer dispositions at a reported price of $0.00 per share, leaving 0 shares of each security reported as held afterward. Under the agreement, he received 0.09334 BlockchAIn Digital Infrastructure, Inc. common shares for every Signing Day share he held, valued at $4.60 per BlockchAIn share, and his option became fully vested and was converted into an option to buy 98 BlockchAIn shares at an exercise price of $1,285.62 per share.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Smith Craig Steven

Role COO and Secretary

Type	Security	Shares	Price	Value
Disposition	Stock Option (right to buy)	1,042	$0.00	--
Disposition	Common Stock	28,775	$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 261 shares on November 16, 2024 and as to 1/36 of the remaining unvested shares in each of the following 36 months, immediately became fully vested, was assumed by BlockchAIn, and was automatically converted into an option to purchase 98 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
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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^*

Smith Craig Steven

(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)

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

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		28,775	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			1,042	(2)	05/03/2033	Common Stock	1,042	(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 261 shares on November 16, 2024 and as to 1/36 of the remaining unvested shares in each of the following 36 months, immediately became fully vested, was assumed by BlockchAIn, and was automatically converted into an option to purchase 98 common shares of BlockchAIn exercisable for $1,285.62 per share.

	/s/ Craig Smith	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 Signing Day Sports (SGN) report for Craig Steven Smith?

Craig Steven Smith reported issuer dispositions of his Signing Day Sports equity. He returned 28,775 common shares and a stock option for 1,042 underlying shares to the company on March 16, 2026, leaving zero Signing Day shares reported as held afterward.

How many Signing Day Sports (SGN) common shares did the COO dispose of?

The COO disposed of 28,775 shares of Signing Day Sports common stock. These were issuer dispositions at a reported price of $0.00 per share, tied to the closing of a Business Combination Agreement on March 16, 2026, that restructured his equity into BlockchAIn securities.

What happened to Craig Steven Smith’s Signing Day Sports stock options?

His option covering 1,042 underlying Signing Day shares was disposed of to the issuer and then fully vested and assumed by BlockchAIn. It was automatically converted into an option to purchase 98 BlockchAIn common shares with an exercise price of $1,285.62 per share.

What BlockchAIn shares did the Signing Day Sports COO receive in the business combination?

He received 0.09334 BlockchAIn common shares for each Signing Day share he held. The BlockchAIn shares were valued at $4.60 per share, based on the first reported sale price after closing, as described for the March 16, 2026 business combination.

Does the Signing Day Sports COO still hold any SGN shares after this Form 4?

After these transactions, the Form 4 shows total holdings of zero Signing Day Sports shares and zero related options. His former equity exposure was converted into BlockchAIn common shares and options as part of the March 16, 2026 Business Combination Agreement closing.

What agreement drove the insider transactions reported for Signing Day Sports (SGN)?

The transactions were driven by a Business Combination Agreement involving Signing Day Sports, One Blockchain LLC, BlockchAIn Digital Infrastructure, and merger subsidiaries. On March 16, 2026, closing triggered share and option exchanges into BlockchAIn securities for the COO.