ACELYRIN, Inc.
5.10%
5,089,260
1962918
00445A100
Apr 28, 2025
Apr 30, 2025, 08:27 PM
Reporting Persons (6)
This is a joint filing. The reported shares may overlap between reporting persons and should not be summed.
| Name | Type | % of Class | Aggregate | Sole Voting | Shared Voting |
|---|---|---|---|---|---|
| Madison Avenue International LP | Partnership | 5.10% | 5,089,260 | 0 | 5,089,260 |
| Madison Avenue Partners, LP | Partnership | 5.10% | 5,089,260 | 0 | 5,089,260 |
| EMAI Management, LLC | Other | 5.10% | 5,089,260 | 0 | 5,089,260 |
| Madison Avenue GP, LLC | Other | 5.10% | 5,089,260 | 0 | 5,089,260 |
| Caraway Jackson Investments LLC | Other | 5.10% | 5,089,260 | 0 | 5,089,260 |
| Eli Samaha | Individual | 5.10% | 5,089,260 | 0 | 5,089,260 |
Disclosure Items (7)
Common Stock
ACELYRIN, Inc.
4149 LIBERTY CANYON ROAD, AGOURA HILLS, CA, 91301
This Schedule 13D is being filed by (i) Madison Avenue International LP, a Cayman Islands exempted limited partnership ("International"), (ii) Madison Avenue Partners, LP, a Delaware limited partnership ("Partners"), (iii) EMAI Management, LLC, a Delaware limited liability company ("Management"), (iv) Madison Avenue GP, LLC, a Delaware limited liability company ("GP"), (v) Caraway Jackson Investments LLC, a Delaware limited liability company ("Caraway"), and (vi) Eli Samaha, a citizen of the United States of America ("Mr. Samaha" and, together with International, Partners, EMAI Management, GP and Caraway, the "Reporting Persons").
The principal business address for each of the Reporting Persons is 150 East 58th St, 14th Fl, New York, NY 10155.
International holds the shares of Common Stock of ACELYRIN, Inc. (the "Company") that are the subject of this statement. The principal business of International is to invest in securities. The principal business of Partners is to serve as an investment manager, including as the investment manager of International. The principal business of GP is to serve as the general partner of International. The principal business of Management is to serve as the general partner of Partners. The principal business of Caraway is owning GP. Mr. Samaha's principal occupation is investing, and directing the investment of assets, including by serving as the non-member manager of GP and as the managing member of Management. As a result of the foregoing relationships, (i) each of Partners and GP may be deemed to beneficially own the Shares held by International, (ii) Management may be deemed to beneficially own the Shares held by Partners, (iii) Caraway may be deemed to beneficially own the Shares held by GP, and (iv) Mr. Samaha may be deemed to beneficially own the Shares held by each of Management, GP and Caraway.
None
International is a Cayman Islands exempted limited partnership. Partners is a Delaware limited partnership. Each of Management, GP and Caraway are Delaware limited liability companies. Mr. Samaha is a citizen of the United States of America.
All of the Common Stock to which this statement relates were purchased on behalf of the Reporting Persons using the investment capital of the respective Reporting Person. The aggregate amount of funds used for the purchase of the securities held by the Reporting Persons was approximately $12,767,883, including commissions.
The aggregate number is 5,089,260 shares of Common Stock. This represents approximately 5.1% of the outstanding Common Stock, assuming 100,709,853 shares outstanding as of March 14, 2025, based on the Company's 10-K filed on March 19, 2025.
5,089,260
The Reporting Persons have not entered into any transactions in the Common Stock during the past sixty days, except as set forth below: Buy/Sell Trade Price Quantity Trade Date Buy $2.69 198,262 3/3/25 Buy $2.47 1,000,000 3/4/25 Buy $2.55 250,000 3/5/25 Buy $2.64 350,000 3/6/25 Buy $2.68 250,000 3/7/25 Buy $2.59 225,000 3/10/25 Buy $2.66 310,631 3/11/25 Buy $2.73 9,648 3/12/25 Buy $2.71 160,000 3/13/25 Buy $2.73 28,083 3/14/25 Buy $2.73 15,852 3/17/25 Buy $2.74 16,409 3/18/25 Buy $2.51 153,367 3/26/25 Buy $2.62 20,254 3/27/25 Sell $2.57 40,923 4/4/25 Sell $2.57 77,999 4/4/25 Sell $2.41 1,700 4/7/25 Buy $2.18 198,422 4/14/25 Buy $2.20 144,670 4/15/25 Buy $2.21 173,190 4/16/25 Buy $2.21 300,000 4/17/25 Buy $2.20 32,876 4/17/25 Buy $2.29 2,513 4/22/25 Buy $2.16 64,899 4/24/25 Buy $2.15 17,662 4/25/25 Buy $2.10 45,394 4/25/25 Buy $2.18 42,423 4/28/25 Buy $2.26 35,043 4/29/25 Buy $2.42 10,150 4/30/25
N/A
N/A
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99.1 - Joint Filing Agreement