UnannouncedVCRaise

Unannounced · 1 dayFiled 18 September 2026

SirenOpt Inc. raised $19.4M

SirenOpt Inc., a manufacturing company based in San Leandro, CA, raised $19.4M in a new equity round, according to a filing dated 18 September 2026.

No public announcement found as of 19 September 2026, 1 day after the filing.

Watch SirenOpt Inc. Share on X Read the filing ↗
Filed
18 September 2026
Round
Equity round
Amount sold
$19.4M
Offering size
$32.4M
Investors so far
17
Based in
San Leandro, CA
Website
sirenopt.com

Investors on the board

Firms come from the venture funds whose filings name a director of this company.

Who is on the board

1 director of this company is named on venture funds' filings. Sign in free with Google to see who, the full filing, and a short list of rounds like this each morning.

Sign in with Google

How it compares

Larger than 69% of the 864 tracked raises with an amount filed in 2026.

SirenOpt Inc. in public filings

FiledFilingSoldRaise
18 Sep 2026New filing$19.4MThis raise

Everything on SirenOpt Inc.

More with At One Ventures on the board

  1. Cuby Technologies, Inc.$6.37MUnannounced · 36 days14 Aug 2026 · New York, NY
  2. Blue Energy Global Inc.$177MUnclear1 May 2026 · Chevy Chase, MD
  3. Chloris Geospatial Inc.$14.8MAnnounced 6 days later1 Jul 2025 · Boston, MA
  4. Modern Hydrogen, Inc.$25MFiled before 202511 Dec 2024 · Woodinville, WA

All 11 raises

Other unannounced rounds

  1. NanosVet, Inc.$8.3MUnannounced · 1 day18 Sep 2026 · Los Angeles, CA
  2. Gravitics, Inc.$28.6MUnannounced · 1 day18 Sep 2026 · Marysville, WA
  3. AEMS Corp.$95KUnannounced · 1 day18 Sep 2026 · Denver, CO
  4. Lumoptik, Inc.$1.54MUnannounced · 1 day18 Sep 2026 · Washington Island, WI
  5. Femtosense, Inc.$21.6MUnannounced · 1 day18 Sep 2026 · San Bruno, CA
  6. XN Companies Inc.$30.5MUnannounced · 1 day18 Sep 2026 · New York, NY

All unannounced rounds

Seen it announced?

Send the link and the check will look at it.