Vault-13

ACELYRIN INC

COM · CUSIP 00445A100

0 institutional holders -2 vs Q2 2025
—reported value*
0 new 0 added 0 reduced 2 sold out net sold ≈ $704 (-285 shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable.

Trends to Q3 2025

Institutional holders

Managers reporting a position, each quarter

050100150Q2 23: 83Q3 23: 103Q4 23: 111Q1 24: 110Q2 24: 114Q3 24: 123Q4 24: 127Q1 25: 107Q2 25: 2Q3 25: 00Q2 23Q4 23Q2 24Q4 24Q2 25Q3 25
Numbers
QuarterHolders
Q2 202383
Q3 2023103
Q4 2023111
Q1 2024110
Q2 2024114
Q3 2024123
Q4 2024127
Q1 2025107
Q2 20252
Q3 20250

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
2000200Q4 23: 59 bought or addedQ4 23: 53 cut or sold outQ1 24: 72 bought or addedQ1 24: 52 cut or sold outQ1 24Q2 24: 67 bought or addedQ2 24: 47 cut or sold outQ3 24: 63 bought or addedQ3 24: 46 cut or sold outQ3 24Q4 24: 59 bought or addedQ4 24: 54 cut or sold outQ1 25: 45 bought or addedQ1 25: 80 cut or sold outQ1 25Q2 25: 2 bought or addedQ2 25: 106 cut or sold outQ3 25: 0 bought or addedQ3 25: 2 cut or sold outQ3 25
Numbers
QuarterBought or addedCut or sold out
Q4 20235953
Q1 20247252
Q2 20246747
Q3 20246346
Q4 20245954
Q1 20254580
Q2 20252106
Q3 202502

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$20k$40k$60k$80kQ4 24 calls: $22.4kQ4 24 puts: $3.8kQ4 24P/C 0.17Q1 25 calls: $70.6kQ1 25 puts: $31.1kQ1 25P/C 0.44Q2 25 calls: $0Q2 25 puts: $0Q2 25P/C —Q3 25 calls: $0Q3 25 puts: $0Q3 25P/C —
Numbers
QuarterCallsPutsP/C
Q4 2024$22.4k$3.8k0.17
Q1 2025$70.6k$31.1k0.44
Q2 2025$0$0—
Q3 2025$0$0—

Biggest buyers

None

Biggest sellers

OSAIC HOLDINGS, INC. Sold out -282-282
IFP Advisors, Inc Sold out -3-3

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
Madison Avenue Partners, LP 13D · may seek influence new · filed 2025-04-30
Stated purposeThe Reporting Persons purchased the shares of Common Stock for investment purposes. The Reporting Persons believe their investment in the Company may appreciate in value in the event the Company does not consummate its proposed merger with Alumis Inc. (the "Proposed Merger"). The Reporting Persons believe the Proposed Merger is financially unsound and will likely deliver less value to shareholders than potential alternatives. In addition, the Reporting Persons believe that the Company's stockholder rights plan (the "Rights Plan"), is not in the best interests of the Company's shareholders and, based on disclosures contained in the Company's proxy statement filed on April 23, 2025, may have been adopted due to the influence of Alumis Inc.'s Chief Executive Officer over the Company. Consequ… Full filing
 5.1% new 5.1m 2025-04-30

Holders, Q3 2025

#ManagerLocationShares Value% of their portfolioChangeShares change