Horizon Space Acquisition II (HSPT) director files Form 4 with no trades

Rhea-AI Filing Summary

Horizon Space Acquisition II Corp. director Cai Tianchen filed a Form 4 that reports no equity transactions for the period covered. The filing shows no open-market purchases or sales, no derivative exercises, and no gifts or restructurings, indicating Cai’s reported holdings did not change in this timeframe.

Key Figures

Reported buy transactions: 0 Reported sell transactions: 0 Net buy/sell shares: 0

3 metrics

Reported buy transactions 0 Current Form 4 transactionSummary buyCount

Reported sell transactions 0 Current Form 4 transactionSummary sellCount

Net buy/sell shares 0 Current Form 4 transactionSummary netBuySellShares

Key Terms

reporting person, derivative transactions, netBuySellShares

3 terms

reporting person financial

"Cai Tianchen is the reporting person and a director of the company."

derivative transactions financial

"The filing’s derivativeTransactionCount is zero, so no derivative transactions occurred."

Derivative transactions are contracts whose value depends on the price or performance of something else—like stocks, bonds, currencies, interest rates or commodities. Think of them as insurance or bets about a future price: investors use them to protect against losses, lock in prices, or try to amplify returns, but they can also magnify losses, create cash demands and expose a firm to the risk that the other party won’t meet its obligation, so they can materially affect a company’s financial stability and volatility.

netBuySellShares financial

"NetBuySellShares is neutral at zero, reflecting no net change in holdings."

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Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Cai Tianchen

(Last) (First) (Middle)

C/O HORIZON SPACE ACQUISITION II CORP.

1412 BROADWAY, 21ST FLOOR, SUITE 21V

(Street)

NEW YORK NEW YORK 10018

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Horizon Space Acquisition II Corp. [ HSPT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/12/2026

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

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

Explanation of Responses:

Remarks:

This "Exit" Form 4 is voluntarily filed to report that, in connection with the consummation of the initial business combination of Horizon Space Acquisition II Corp. ("HSPT") on June 12, 2026 pursuant to the Business Combination Agreement dated May 9, 2025 by and among HSPT, SL Science Holding Limited, a Cayman Islands exempted company limited by shares, SL BIO Ltd., a Cayman Islands exempted company limited by shares, CW Mega Limited, a Cayman Islands exempted company limited by shares, and WW Century Limited, a Cayman Islands exempted company limited by shares, the Reporting Person no longer served as a director of HSPT or held any ordinary shares of HSPT after June 12, 2026, and therefore is no longer subject to Section 16 reporting.

	/s/ Tianchen Cai	06/17/2026
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What does Cai Tianchen’s Form 4 for HSPT show about recent insider trades?

The Form 4 for Horizon Space Acquisition II Corp. shows no insider trades by director Cai Tianchen. It reports zero purchases, sales, exercises, gifts, tax withholdings, or restructurings, meaning reported holdings were unchanged for the covered period.

Did Horizon Space Acquisition II Corp. director Cai Tianchen buy HSPT shares in this Form 4?

No. The Form 4 indicates no share purchases by director Cai Tianchen. The transaction summary lists zero buy transactions and zero buy shares, so there is no new open-market or other acquisition disclosed in this report.

Did Cai Tianchen sell any Horizon Space Acquisition II Corp. (HSPT) shares in this filing?

No. The filing shows no sales of Horizon Space Acquisition II Corp. shares by Cai Tianchen. SellCount and sellShares are both zero, and netBuySellShares is neutral, indicating no reported disposals in this period.

Are there any option exercises or derivative transactions for HSPT in Cai Tianchen’s Form 4?

No. The Form 4 reports no derivative activity for Cai Tianchen. ExerciseCount, exerciseShares, and derivativeTransactionCount are all zero, and the derivativeSummary table is empty, so no options or similar instruments are shown as exercised or traded.

Does the Horizon Space Acquisition II Corp. Form 4 show any gifts or tax-related share withholdings?

No. The filing lists no gifts or tax withholdings. GiftCount, giftShares, taxWithholdingCount, and taxWithholdingShares are all zero, indicating there were no non-market transfers or tax-related dispositions reported in this period.