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Private company

CesiumAstro

Logo: cesiumastro.com4

American satellite communications and aerospace technology company

CesiumAstro is an Austin, Texas based startup specializing in phased array technology. The company is building antennas and communications systems for satellites. CesiumAstro was founded in 2017 by Shey Sabripour.3 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

2017Founded1
  • Industrytelecommunications industry1
  • HeadquartersAustin1
  • Websitewww.cesiumastro.com
  • Legal formDelaware corporation1
  • Incorporated inDE5
  • Business address13215 Bee Cave Pkwy, Suite A-300, Austin, Tx 787385

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CesiumAstro image from its website
Image: cesiumastro.com4

CesiumAstro is an Austin, Texas based startup specializing in phased array technology. The company is building antennas and communications systems for satellites.3

The story

The company completed a $12.4 million Series A funding round in March 2019. In 2020, CesiumAstro expanded its capabilities by opening a spacecraft design and engineering facility in Broomfield, Colorado.

In January 2023, CesiumAstro acquired TXMission, a UK-based developer of software-defined radios and modems, broadening the technology portfolio and establishing a European presence.

In June 2024, CesiumAstro secured an additional $65 million in a Series B+ investment round led by Trousdale Ventures, with participation from the Development Bank of Japan and Quanta Computer, Inc. This brought the company's total equity raised since its founding to $156 million. The proceeds were allocated to scaling R&D, manufacturing, and global operations as the company responded to increased demand for its phased-array communications payloads.

In July 2024 it was awarded a contract by NASA’s Marshall Space Flight Center (MSFC) to deliver radio units for lunar navigation (LunaNet Technology).

From Wikipedia’s article on CesiumAstro, shared under CC BY-SA 4.0.6

Leadership

Named in SEC Form D filings

People the company listed in its private-offering notices.

  • Executive OfficerChris Pappas III named Jun 9, 20267
  • Executive OfficerKenneth Smith named Jun 9, 20267
  • Executive OfficerKrystle Caponio named Jun 9, 20267
  • Executive Officer, DirectorShey Sabripour named Mar 2, 2022 to Jun 9, 20267
  • DirectorDaniel Sable named Mar 2, 2022 to Jun 9, 20267
  • DirectorJonathan Hodock named Mar 2, 2022 to Jun 9, 20267
  • DirectorPhillip Sarofim named Jun 9, 20267
  • DirectorThomas D'Halluin named Jan 27, 2023 to Jun 9, 20267
  • DirectorVictor See, Jr. named Jun 9, 20267
  • DirectorWen Hsieh named Mar 2, 2022 to Feb 13, 20248
  • DirectorThomas D?Halluin named Mar 2, 20229

Products and brands

CesiumAstro specializes in the development of advanced phased array antenna systems, software-defined radios (SDRs), and multi-beam, reconfigurable communications modules tailored for a wide range of platforms including CubeSats, small satellites, and larger aerospace vehicles. CesiumAstro integrates commercial off-the-shelf (COTS) components with in-house vertically integrated manufacturing, allowing for scalable production and rapid adaptation to customer requirements.

From Wikipedia’s article on CesiumAstro, shared under CC BY-SA 4.0.6

Timeline

  1. 2017Founded Founded1

Filings

5 filings to the SEC since October 2021: 5 private raises. The latest 5:

  1. Jun 9, 2026D EDGAR
  2. Feb 13, 2024D EDGAR
  3. Jan 27, 2023D EDGAR
  4. Mar 2, 2022D EDGAR
  5. Mar 2, 2022D/A EDGAR

Every filing from the last five years, summarized. The full record is on SEC EDGAR.

Funding

Where the company's money came from, by calendar year: private offerings filed with the SEC, federal grants, loans, contracts and other assistance from USAspending.gov, and PPP loans from the SBA. Each bar links to the records below.

Money received by year$377.6M 2020–2025
Money received by yearMoney received by year, 2020–2025: $377.6M in all. Private raises (Form D) $377.6M.$0$100M$200M$300M2020 · Private raises (Form D): $15.0M20202022 · Private raises (Form D): $60.0M20222023 · Private raises (Form D): $2.1M2024 · Private raises (Form D): $30.0M20242025 · Private raises (Form D): $270.5M2025
Figures by year
YearPrivate raises (Form D)Total
2025$270.5M$270.5M
2024$30.0M$30.0M
2023$2.1M$2.1M
2022$60.0M$60.0M
2020$15.0M$15.0M

Private raises

Private offerings the company reported to the SEC on Form D. The amount is what the latest filing says was sold so far, charted in the year of the first sale. Covers filings since Oct 1, 2021.

  1. Jul 3, 2025Raised $270.5 million in a private offering of equity7 Form D: 37 investors so far Form D
  2. Jan 29, 2024Raised $30 million in a private offering of equity8 Form D: $50 million offered in all Form D
  3. Jan 6, 2023Raised $2.1 million in a private offering of equity10 Form D: 5 investors so far Form D
  4. Feb 3, 2022Raised $60 million in a private offering of equity9 Form D: 12 investors so far Form D
  5. Oct 7, 2020Raised $15 million in a private offering of debt11 Form D: 10 investors so far Form D

SEC filer profile

How CesiumAstro is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

  • Name on EDGARCesiumAstro Inc.2
  • CIK0001707363
  • Employer ID (EIN)81-51500462
  • Incorporated inDelaware2
  • Fiscal year endsDecember 312
  • Business address13215 Bee Cave Pkwy, Suite A-300, Austin, TX 787382
  • Phone(512) 520-81162
  • On EDGAR sinceMay 25, 20172
  • Filings9 in all: D (7), D/A (2)2

Sources

The numbers on this page point here. Each one links to the record it came from.

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  4. 4
    Company websiteCesiumAstro logo
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