---
title: "Series 21-3, a series of StartEngine Private LLC SEC filings"
url: https://altstreet.investments/edgar/2117568
kind: edgar-entity
updated: 2026-07-31
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.
---

# Series 21-3, a series of StartEngine Private LLC: SEC filings and what they report

Series 21-3, a series of StartEngine Private LLC, filed Form D on 2026-03-09 reporting $281K raised from 8 investors under Rule 506(c). The offering has a $15K minimum investment and is structured as equity securities. This is part of the StartEngine platform, which operates 117 related EDGAR entities in the pre-IPO investment space.

| Field | Value |
| --- | --- |
| Entity | Series 21-3, a series of StartEngine Private LLC |
| CIK | 2117568 |
| Filing family | 506(c) |
| Entity type | single deal spv |
| Manager (as filed) | StartEngine |
| Platform | StartEngine (https://altstreet.investments/platforms/reviews/startengine) |
| Newest fact-bearing filing | March 9, 2026, accession 0002117568-26-000001 |
| Total offering amount (as filed) | $281,000 |
| Total sold (as reported) | $281,000 |
| Investors (as reported) | 8 |
| Minimum investment (as filed) | $15,000 |
| Vintage | 2026 |

## Related persons (Form D Item 3)

| Name | Relationship |
| --- | --- |
| Howard Marks | Director |


## Filings (1 on record, newest first)

| Date | Form | Family | SEC link |
| --- | --- | --- | --- |
| March 9, 2026 | D | Form D | https://www.sec.gov/Archives/edgar/data/2117568/000211756826000001/ |


## More

- Entity page (HTML, with events, parties and the platform record): https://altstreet.investments/edgar/2117568
- SEC EDGAR filing index: https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0002117568&owner=include&count=40
- Other issuers on StartEngine: https://altstreet.investments/deals/platform/startengine
- 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/2117568
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.