Signing Day Sports (SGN) CEO exits SGN equity as BlockchAIn deal closes

Rhea-AI Filing Summary

Signing Day Sports, Inc. CEO and chairman Daniel D. Nelson reported dispositions of his equity in connection with the closing of a previously signed business combination with BlockchAIn Digital Infrastructure, Inc. on March 16, 2026. He disposed of 402,042 shares of common stock held directly and 31,247 shares held indirectly through The Nelson Revocable Living Trust in transactions coded as dispositions to the issuer. He also surrendered stock options covering 625, 105 and 2,084 shares of common stock, which were assumed by BlockchAIn and converted into options over smaller numbers of BlockchAIn shares at specified exercise prices under the Business Combination Agreement. Following these transactions, the filing shows no remaining Signing Day Sports common stock or options for the reporting person.

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

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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^*

Nelson Daniel D

(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
X	Officer (give title below)		Other (specify below)
	CEO and Chairman

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		402,042	D	(1)	0	D
Common Stock	03/16/2026		D		31,247	D	(1)	0	I	By The Nelson Revocable Living Trust(2)

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)	$148.8	03/16/2026		D			625	(3)	09/28/2032	Common Stock	625	(3)	0	D
Stock Option (right to buy)	$148.8	03/16/2026		D			105	(4)	09/28/2032	Common Stock	105	(4)	0	D
Stock Option (right to buy)	$108	03/16/2026		D			2,084	(5)	11/21/2033	Common Stock	2,084	(5)	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. The reporting person is a co-trustee of The Nelson Revocable Living Trust, an Arizona trust provided for by the Nelson Revocable Living Trust Agreement established on March 9, 1999 and amended and restated on November 21, 2005. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.

3. Pursuant to the terms of the Business Combination Agreement, on the Closing Date, the reporting person's option was assumed by BlockchAIn, and was automatically converted into an option to purchase 59 common shares of BlockchAIn exercisable for $1,594.17 per share.

4. Pursuant to the terms of the Business Combination Agreement, on the Closing Date, the reporting person's option was assumed by BlockchAIn, and was automatically converted into an option to purchase 10 common shares of BlockchAIn exercisable for $1,594.17 per share.

5. Pursuant to the terms of the Business Combination Agreement, on the Closing Date, the reporting person's option was assumed by BlockchAIn, and was automatically converted into an option to purchase 195 common shares of BlockchAIn exercisable for $1,157.06 per share.

	/s/ Daniel D. Nelson	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).
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* Form 4: SEC 1474 (03-26)

FAQ

What insider transactions did Signing Day Sports (SGN) report for Daniel D. Nelson?

Daniel D. Nelson reported issuer dispositions of common stock and stock options on March 16, 2026. He disposed of 402,042 shares held directly, 31,247 shares held via a trust, and multiple option awards, all tied to the business combination closing.

Were Daniel D. Nelson’s stock option awards at Signing Day Sports affected?

Yes. Stock options covering 625, 105, and 2,084 Signing Day Sports shares were disposed of to the issuer. Under the Business Combination Agreement, these options were assumed by BlockchAIn and converted into options over BlockchAIn common shares at new exercise prices.

How were Daniel D. Nelson’s Signing Day Sports common shares treated in the BlockchAIn merger?

On the closing date, Nelson received 0.09334 BlockchAIn common share for each Signing Day Sports share he held. The footnote states BlockchAIn shares had a market value of $4.60 per share based on the first reported sale price after closing.

What happened to shares held through The Nelson Revocable Living Trust?

An indirect holding of 31,247 Signing Day Sports shares, reported as held by The Nelson Revocable Living Trust, was also disposed of to the issuer. Nelson is a co‑trustee and disclaims beneficial ownership except to the extent of his pecuniary interest in those securities.

Did Daniel D. Nelson retain any Signing Day Sports equity after these transactions?

According to the filing, the total shares and options reported as of March 16, 2026 show zero Signing Day Sports common stock and stock options remaining. His economic exposure shifted to BlockchAIn securities under the terms of the Business Combination Agreement.

How were the converted BlockchAIn stock options structured for Daniel D. Nelson?

Footnotes state that on closing, his options were assumed by BlockchAIn and automatically converted into options to purchase 59, 10, and 195 BlockchAIn common shares, exercisable at $1,594.17 or $1,157.06 per share, depending on the grant.