---
title: "ASF IX Sidecar, L.P. SEC filings"
url: https://altstreet.investments/edgar/2148828
kind: edgar-entity
updated: 2026-11-02
publisher: AltStreet (https://altstreet.investments)
license: Public factual pages may be read, quoted and cited with attribution and a link. Bulk redistribution is not permitted.
---

# ASF IX Sidecar, L.P.: SEC filings and what they report

ASF IX Sidecar, L.P. is a Delaware-organized pooled investment fund filed as a new Form D by its promoters, ASF IX Sidecar GP, LLC and AlpInvest Secondaries IX Lux GP S.à r.l., indicating it functions as a co-investment/sidecar vehicle alongside AlpInvest's Secondaries Fund IX program. The filing is pre-open with no disclosed capital raised, investor count, or first sale date, and relies on the standard 506(b)/3(c) exemption pairing used for private institutional funds.

| Field | Value |
| --- | --- |
| Entity | ASF IX Sidecar, L.P. |
| CIK | 2148828 |
| Filing family | 506(b), 3(c) |
| Entity type | co invest |
| Manager (as filed) | AlpInvest Partners |
| Newest fact-bearing filing | October 29, 2026, accession 0000904454-26-000561 |
| Total sold (as reported) | $0 |
| Vintage | 2026 |

## Related persons (Form D Item 3)

| Name | Relationship |
| --- | --- |
| N/A ASF IX SIDECAR GP, LLC | Promoter |
| N/A ALPINVEST SECONDARIES IX LUX GP S.A R.L. | Promoter |


## More

- Entity page (HTML, with events, parties and the platform record): https://altstreet.investments/edgar/2148828
- SEC EDGAR filing index: https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0002148828&owner=include&count=40
- Signal history, evidence passages and the entity graph are AltStreet Terminal features: https://altstreet.investments/terminal

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Source page: https://altstreet.investments/edgar/2148828
Machine index: https://altstreet.investments/llms.txt
AltStreet reads what platforms, funds and issuers file with the SEC and what they tell investors, and publishes the difference. Figures are as filed or as captured on the date stated; nothing here is investment advice.