Siren Biotechnology, Inc. is raising up to $5M on Wefunder Portal LLC in preferred stock at $6.41 each; in its filing revenue was $0 and it had 5 employees (Form C-AR, 2026-04-06).
Siren Biotechnology, Inc. filed a Regulation Crowdfunding offering with the SEC through Wefunder Portal LLC, with a target of $50K and a maximum of $5M. As of November 6, 2026, the offering is past its deadline of April 30, 2026. The company gives its address as San Francisco, CA (Form C, April 2, 2025).
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Key facts
Siren Biotechnology, Inc., based in San Francisco, CA, filed a Regulation Crowdfunding offering with the SEC, the latest on 2025-04-02, raising through Wefunder Portal LLC. It set a target of $50K and will accept up to $5M. The security offered is preferred stock at $6.41 each. As of its filings the offering is past its deadline of 2026-04-30. 2 filings in this family are on record for the company.
Terms at a glance
| Target | $50K |
| Maximum it will accept | $5M |
| Security | Preferred Stock |
| Price per unit | $6.41 (Dividing pre-money valuation $60,000,000.00 by number of shares outstanding on fully diluted basis at the start of the Series A financing.) |
| Units at the target | 7,800 |
| Raise above the target | accepted, other |
| Deadline | 2026-04-30 |
| Raising through | Wefunder Portal LLC |
| What the portal is paid, as filed | 5.0% of the offering amount upon a successful fundraise, and be entitled to reimbursement for out-of-pocket third party expenses it pays or incurs on behalf of the Issuer in connection with the offering. |
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What the Full Report on Siren Biotechnology, Inc. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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The filing does not state a company valuation or a minimum investment; the offering page on Wefunder Portal LLC shows those. Check both before you invest.
Money raised before
Earlier raises by this company that are on file, with the amounts as filed. A figure for a raise is what the company reported, not a check of what it received.
| Filed | What | Amount as filed | Filing |
|---|---|---|---|
| 2024-04-22 | Private placement (Form D) | $19.61M sold of $32.44M offered | filing |
Offering filings
| Filed | Intermediary | Target | Maximum | Deadline | Security | Filing |
|---|---|---|---|---|---|---|
| 2025-04-02 | Wefunder Portal LLC | $50K | $5M | 2026-04-30 | Preferred Stock | C |
Financials the company filed
Figures from the C-AR filed 2026-04-06, as the company reported them.
| As filed | Most recent fiscal year | Prior fiscal year |
|---|---|---|
| Revenue | $0 | $0 |
| Net income | -$10.88M | -$4.67M |
| Total assets | $12.02M | $17.54M |
| Cash and equivalents | $11.93M | |
| Short-term debt | $377K | |
| Long-term debt | $0 |
Employees at filing: 5.
Revenue went from $0 to $0. Net loss was $10.88M, against a loss of $4.67M the year before. It reported $11.93M in cash and $377K in debt. These are the company's own figures from the Form C-AR filed 2026-04-06.
People who signed the filing
- Dr. Nicole K. Paulk, PhD, CEO, Founder, and President
- Dr. Stefano Gurciullo, Director
Every filing
What to check before investing
- Read the offering page on Wefunder Portal LLC: it states the valuation or cap and the minimum investment, which the SEC filing does not.
- Compare the terms above with the numbers: what does the price imply against revenue of $0?
- Look at who signed the filing and what else they have run (the founder Snapshot below).
- Check the deadline and what happens if the target is missed.
- You cannot easily sell a crowdfunding security; invest only what you can leave tied up.
A crowdfunding round is won in public. FoxPlug turns your commits, deploys and releases into the posts and visuals that keep the story moving while the offering is open.
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Where this comes from
A company raising money from the public under Regulation Crowdfunding has to file with the SEC before the offering opens, and has to raise through a single registered intermediary: a funding portal or a broker-dealer. The first filing, Form C, states how much the company is trying to raise, the most it will accept, the deadline, the security and its price, the intermediary and what the intermediary is paid, and two years of the company's own financial figures.
After that the company files amendments when terms change, progress updates as the raise moves, and an annual report each year until it stops reporting. Every row here is one of those filings, linked to the filing itself, so each figure can be checked at the source. Figures are exactly as the company filed them; where a filing leaves a field blank, so does this page. Nothing here is investment advice, and a filing is the company's own statement, not a verification of it.