Insider filing report for Changes in Beneficial Ownership
- Schedule 13G & 13D forms are used to report a party's ownership of stock which exceeds 5% of a company's total stock issue.
- Schedule 13G is a shorter version of Schedule 13D with fewer reporting requirements.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
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- Peter Lynch
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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549 |
SCHEDULE 13D
Under the Securities Exchange Act of 1934
(Amendment No. 1)*
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ACELYRIN, Inc. (Name of Issuer) |
Common stock (Title of Class of Securities) |
00445A100 (CUSIP Number) |
Fredrik Ostlund 60 Gresham Street, London, X0, EC2V 7BB 00442079597185 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) |
03/06/2025 (Date of Event Which Requires Filing of This Statement) |
If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.


The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the
Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other
provisions of the Act (however, see the Notes).
SCHEDULE 13D
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CUSIP No. | 00445A100 |
1 |
Name of reporting person
Trium Capital LLP | ||||||||
2 | Check the appropriate box if a member of a Group (See Instructions)
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3 | SEC use only | ||||||||
4 |
Source of funds (See Instructions)
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5 |
Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
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6 | Citizenship or place of organization
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Number of Shares Beneficially Owned by Each Reporting Person With: |
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11 | Aggregate amount beneficially owned by each reporting person
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12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
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13 | Percent of class represented by amount in Row (11)
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14 | Type of Reporting Person (See Instructions)
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SCHEDULE 13D
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Item 1. | Security and Issuer |
(a) | Title of Class of Securities:
Common stock |
(b) | Name of Issuer:
ACELYRIN, Inc. |
(c) | Address of Issuer's Principal Executive Offices:
4149 LIBERTY CANYON RD., 4149 LIBERTY CANYON RD., AGOURA HILLS,
CALIFORNIA
, 91301. |
Item 4. | Purpose of Transaction |
Item 4 of the Schedule 13D is hereby amended by adding the following thereto: On 28th April 2025, Trium Capital LLP delivered a letter (the "Letter") to the Special Committee of the Board of Directors of Acelyrin Inc. A copy of the Letter is attached hereto as Exhibit 1. Trium Capital LLP intends to have conversations, meetings and other communications with the management of Acelyrin Inc, shareholders and other persons, in each case to discuss the Merger, Acelyrin Inc's business, operations, strategy, governance and related matters. These communications may include a discussion of options for enhancing sha
reholder value, including the matters discussed in the Letter. | |
Item 7. | Material to be Filed as Exhibits. |
On 28th April 2025, Trium Capital LLP delivered a letter to the Special Committee of the Board of Directors of the Issuer. A copy of the Letter is attached hereto as Exhibit 1. |
SIGNATURE | |
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
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