Latest Period
Q4 2025
Security Snapshot
ACELYRIN, Inc. - Common Stock (SLRN) Institutional Ownership
CUSIP: 00445A100
13F Institutional Holders and Ownership History from Q2 2023 to Q4 2025
Institutions Reporting
0
Shares (Excl. Options)
0
Price
$2.23
- Type / Class
- Equity / Common Stock
- Symbol
- SLRN
- Shares outstanding
- 99,789,412
- Price per share
- $2.23
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 0
- Total reported value
- $0
- Share change
- -96,408
- Value change
- -$475,292
- Number of holders
- 0
- Price from insider filings
- $2.23
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- SLRN - ACELYRIN, Inc. - Common Stock is tracked under CUSIP 00445A100.
- 0 institutions reported positions in Q4 2025.
- 4 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 0 to 0 between Q3 2025 and Q4 2025.
- Reported value moved from $0 to $0.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Official SEC Source
Backed by Form 13F
Ownership context comes from SEC Form 13F and, when available, Schedule 13D/13G filings.
See Original FilingInvestment Quick Answers
What is CUSIP 00445A100?
CUSIP 00445A100 identifies SLRN - ACELYRIN, Inc. - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Continue Investment Research
- Latest 13F filings for new institutional portfolio disclosures.
- Latest Schedule 13D/13G reports for activist and beneficial ownership updates.
- Latest 10-Q/10-K reports to cross-check issuer fundamentals.
- Recent insider transactions for management buying/selling context.
- SEC investors directory and top value investors for manager-level discovery.
- All institutional ownership pages to compare adjacent CUSIP pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 00445A100:
Significant Owners of ACELYRIN, Inc. - Common Stock (SLRN) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Madison Avenue Partners, LP | 5.1% | $12,468,687 | 5,089,260 | Madison Avenue Partners, LP | 29 Apr 2025 | |||
| INTEGRATED CORE STRATEGIES (US) LLC | 4.7% | $11,550,285 | 4,714,402 | Integrated Core Strategies (US) LLC | 31 Dec 2024 | |||
| T. Rowe Price Investment Management, Inc. | 4.6% | -63% | $11,395,024 | -$20,141,680 | 4,651,030 | -64% | T. Rowe Price Investment Management, Inc. | 28 Feb 2025 |
| CITADEL ADVISORS LLC | 4.2% | $10,335,933 | 4,218,748 | Kenneth Griffin | 31 Dec 2024 |
Institutional Holders of ACELYRIN, Inc. - Common Stock (SLRN) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 0 | $0 | -$475,292 | $2.23 | 0 |
| 2025 Q3 | 0 | $0 | -$704 | $2.23 | 0 |
| 2025 Q2 | 285 | $704 | -$182,689,505 | $2.40 | 2 |
| 2025 Q1 | 73,967,745 | $182,702,710 | -$43,110,284 | $2.47 | 106 |
| 2024 Q4 | 87,976,058 | $276,403,640 | -$879,364 | $3.14 | 123 |
| 2024 Q3 | 87,244,575 | $430,198,271 | -$8,690,665 | $4.93 | 122 |
| 2024 Q2 | 86,992,477 | $383,635,062 | -$24,832,640 | $4.41 | 112 |
| 2024 Q1 | 90,862,849 | $613,238,960 | +$36,541,176 | $6.75 | 109 |
| 2023 Q4 | 84,798,520 | $632,598,011 | +$2,496,700 | $7.46 | 109 |
| 2023 Q3 | 83,820,150 | $847,008,971 | +$3,718,312 | $10.17 | 102 |
| 2023 Q2 | 77,168,075 | $1,602,817,890 | +$1,407,721,928 | $20.90 | 82 |