Jeffry Hecklinski - 16 Mar 2026 Form 4 Insider Report for Signing Day Sports, Inc. (SGN)

Role: President, Director
Signature: /s/ Jeffry Hecklinski
Issuer symbol: SGN
Transactions as of: 16 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 18 Mar 2026, 16:05:23 UTC
Previous filing: 13 Dec 2024
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Hecklinski Jeffry	President, Director	C/O SIGNING DAY SPORTS, INC., 8355 EAST HARTFORD RD., SUITE 100, SCOTTSDALE	/s/ Jeffry Hecklinski	18 Mar 2026	0002018800

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SGN	Common Stock	Disposed to Issuer		-9,262	-100%		0	16 Mar 2026	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	SGN	Stock Option (right to buy)	Disposed to Issuer		-834	-100%		0	16 Mar 2026	Common Stock	834	$148.80	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Jeffry Hecklinski is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.

Explanation of Responses:

Id	Content
F1	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.
F2	Pursuant to the terms of the Business Combination Agreement, on the Closing Date, the reporting person's option, which provided for vesting as to 209 shares immediately upon the date of grant, as to 156 shares on the one-year anniversary of the date of grant, and as to an aggregate of 469 shares in approximately equal increments at the end of each of the following 36 calendar months, immediately became fully vested, was assumed by BlockchAIn, and was automatically converted into an option to purchase 78 common shares of BlockchAIn exercisable for $1,594.17 per share.

Content

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 209 shares immediately upon the date of grant, as to 156 shares on the one-year anniversary of the date of grant, and as to an aggregate of 469 shares in approximately equal increments at the end of each of the following 36 calendar months, immediately became fully vested, was assumed by BlockchAIn, and was automatically converted into an option to purchase 78 common shares of BlockchAIn exercisable for $1,594.17 per share.