Daniel D. Nelson - 16 Mar 2026 Form 4 Insider Report for BlockchAIn Digital Infrastructure, Inc. (AIB)

Reporting relationship: Director
Issuer ticker: AIB
Reported as of: 16 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 18 Mar 2026, 16:37:46 UTC
Prior SEC filing: 13 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Daniel D. Nelson

Key filing fact

Daniel D. Nelson filed Form 4 for BlockchAIn Digital Infrastructure, Inc. (AIB) on 18 Mar 2026.

Key facts

This page summarizes Daniel D. Nelson's Form 4 filing for BlockchAIn Digital Infrastructure, Inc. (AIB).
5 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 18 Mar 2026, 16:37.

Change

Previous filing in this sequence was filed on 13 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001972305 Primary reporting owner

Nelson Daniel D

Relationship: Director
Address: 1540 BROADWAY, STE 1010, NEW YORK
Signature: /s/ Daniel D. Nelson
Signature date: 18 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AIB transaction

Common Stock

Award

Transaction value
Shares: +37,527
Change %
Price
Shares after: 37,527
Date: 16 Mar 2026
Ownership: Direct
Footnotes: F1

AIB transaction

Common Stock

Award

Transaction value
Shares: +2,917
Change %
Price
Shares after: 2,917
Date: 16 Mar 2026
Ownership: By The Nelson Revocable Living Trust
Footnotes: F1, F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

AIB transaction Derivative

Stock Option (right to buy)

Award

Transaction value
Shares: +59
Change %
Price
Shares after: 59
Date: 16 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 59
Exercise price: $1594.17
Footnotes: F3

AIB transaction Derivative

Stock Option (right to buy)

Award

Transaction value
Shares: +10
Change %
Price
Shares after: 10
Date: 16 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 10
Exercise price: $1594.17
Footnotes: F4

AIB transaction Derivative

Stock Option (right to buy)

Award

Transaction value
Shares: +195
Change %
Price
Shares after: 195
Date: 16 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 195
Exercise price: $1157.06
Footnotes: F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

Pursuant to the Business Combination Agreement, dated as of May 27, 2025, by and among Signing Day Sports, Inc., a Delaware corporation ("SGN"), 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 reporting person received 0.09334 common shares of BlockchAIn for every share of common stock of SGN held by the reporting person, subject to rounding adjustments. The last reported sale price of SGN common stock after the Closing was $0.54 per share, as reported on March 16, 2026. The first reported sale price after the Closing of BlockchAIn's common stock was $4.60 per share, as reported on March 17, 2026.

Footnote F2

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.

Footnote F3

Pursuant to the terms of the Business Combination Agreement, on the date of the Closing, the reporting person's employee stock option to acquire 625 shares of SGN common stock for $148.80 per share was assumed by BlockchAIn and automatically converted into an option to purchase 59 common shares of BlockchAIn exercisable for $1,594.17 per share.

Footnote F4

Pursuant to the terms of the Business Combination Agreement, on the date of the Closing, the reporting person's employee stock option to acquire 105 shares of SGN common stock for $148.80 per share was assumed by BlockchAIn and automatically converted into an option to purchase 10 common shares of BlockchAIn exercisable for $1,594.17 per share.

Footnote F5

Pursuant to the terms of the Business Combination Agreement, on the date of the Closing, the reporting person's employee stock option to acquire 2,084 shares of SGN common stock for $108.00 per share was assumed by BlockchAIn and automatically converted into an option to purchase 195 common shares of BlockchAIn exercisable for $1,157.06 per share.