Bracebridge H. Young Jr - Sep 29, 2025 Form 3 Insider Report for BTC Development Corp. (BDCI)

Role: President, CEO and Director, Director, 10%+ Owner
Signature: /s/ Bracebridge H. Young, Jr.
Stock symbol: BDCI
Transactions as of: Sep 29, 2025
Transactions value $: $0
Form type: 3
Date filed: 9/30/2025, 08:49 PM
Previous filing: Aug 28, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Young Bracebridge H Jr	President, CEO and Director, Director, 10%+ Owner	2929 ARCH STREET, SUITE 1703, PHILADELPHIA	/s/ Bracebridge H. Young, Jr.	2025-09-30	0001894252

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	BDCI	Class A Ordinary Shares						513K	Sep 29, 2025	By BTC Development Sponsor LLC	F1, F2, F3

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
holding	BDCI	Class B Ordinary Shares							Sep 29, 2025	Class A Ordinary Shares	4.59M		By BTC Development Sponsor LLC	F2, F3, F4, F8
holding	BDCI	Warrants							Sep 29, 2025	Class A Ordinary Shares	128K	$11.50	By BTC Development Sponsor LLC	F2, F3, F5, F6, F7

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

Explanation of Responses:

Id	Content
F1	These shares underlie 512,500 units of the issuer that BTC Development Sponsor LLC has irrevocably committed to purchase.
F2	The reporting person disclaims beneficial ownership of these securities, except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for any other purpose.
F3	These shares are held directly by one of the issuer's sponsors, BTC Development Sponsor LLC, which is managed by the reporting person.
F4	The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the issuer's initial business combination, or at any time and from time to time at the option of the holder, on a one-for-one basis, subject to certain adjustments described in the issuer's charter documents and have no expiration date.
F5	The warrants will become exercisable at the later of 30 days after the consummation of the issuer's initial business combination or 12 months from the completion of the issuer's initial public offering.
F6	The warrants will expire five years after the consummation of the issuer's initial business combination or earlier upon redemption of all of the issuer's outstanding Class A ordinary shares or the issuer's liquidation.
F7	These warrants underlie 512,500 units of the issuer that BTC Development Sponsor LLC has irrevocably committed to purchase.
F8	Includes up to 1,100,000 shares that are subject to forfeiture in the event the underwriters of the issuer's initial public offering do not exercise in full their over-allotment option.