Economou Gregory 4

4 · Signing Day Sports, Inc. · Filed Mar 18, 2026

AI-generated summary of this filing

Updated Mar 18, 2026

Signing Day Sports (SGN) Director Gregory Economou Disposes Shares

What Happened

Gregory Economou, a director of Signing Day Sports, reported dispositions to the issuer on March 16, 2026: 90,919 common shares and 500 derivative shares (transaction code D). These transactions were part of the closing of a business combination that converted Signing Day shares into BlockchAIn shares.
Under the deal, each Signing Day share converted into 0.09334 BlockchAIn shares (subject to rounding). That conversion implies Economou received roughly 8,486 BlockchAIn shares for the 90,919 Signing Day shares, and at BlockchAIn’s first reported sale price of $4.60 (reported Mar 17, 2026) equals roughly $39,000 in market value. The filing shows per-share price as N/A because the disposition was a conversion in the merger, not an open-market sale.

Key Details

Transaction date: March 16, 2026 (report filed March 18, 2026).
Transaction type: Disposition to issuer (D) as part of the business combination closing.
Conversion ratio / valuation note: 0.09334 BlockchAIn shares per Signing Day share; BlockchAIn first sale price $4.60 used to estimate value.
Derivative/option detail (footnote): Economou’s option immediately became fully vested, was assumed by BlockchAIn, and was converted into an option to purchase 47 BlockchAIn shares exercisable at $1,285.62 per share (total exercise cost ≈ $60,424).
Shares owned after transaction: not specified in the filing.
Timeliness: Filed March 18 for a March 16 transaction (filed within the typical two‑business‑day Form 4 window).

Context

This was not an open‑market sale but a conversion/cancellation tied to the closing of the business combination—dispositions to the issuer in mergers commonly reflect conversion into the acquiror’s securities rather than a cash sale.
The derivative entry relates to the treatment of an option at closing: it vested, was assumed, and converted into an option on BlockchAIn stock. That option has a high exercise price ($1,285.62/share), so exercising it would require significant cash outlay.
For retail investors: this filing documents structural changes from the merger (share conversion and option assumption) rather than a director selling stock for cash; interpret accordingly.

Form 4Exit

Period: 2026-03-16

Director

Transactions

Disposition to Issuer
Common Stock
[F1]
2026-03-16−90,919→ 0 total
Disposition to Issuer
Stock Option (right to buy)
[F2]
2026-03-16−500→ 0 total
Exercise: $120.00Exp: 2033-05-09→ Common Stock (500 underlying)

Footnotes (2)

[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 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.

Signature

/s/ Gregory Economou|2026-03-18

1 file