CESIUMASTRO INC

Austin, TX · Founded 2017 · Aerospace · Private

Software-defined satellite systems, terminals, and ground infrastructure for satellite communications

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Updated Oct 23, 2026 · cesiumastro.com

Sector: Aerospace
Headquarters: Austin, TX
Founded: 2017
Latest Form D: $271M, Jun 2026
Total capital: $404M

Federal grants: $3.5M; 5 awards · 2017–2022; Rank in peer group#116 of 155
Private capital raised: $387M; 7 Form D · last Jun 2026; 5 months since last filing
Federal contracts: $13.4M; 22 awards · Defense, NASA; Rank in Aerospace#196 of 1335
Granted patents: 3; 12 pending · first 2025; Rank in peer group#46 of 155

Capital timeline

Latest events

Jun 2026Private capital raisedForm D · SEC · 7th filing$271M
Dec 2025Federal contractDefense · Scalable Homeland Innovative Enterprise Layered Defense (shield) Initial Order.$500
Aug 2025Federal contractNASA · Phase III - OPP001096-1 Cesiumastro - Kastle SBIR Phase 3$195K
Oct 2024Federal contractNASA · SBIR Phase III - Radio Ranging Firmware Modifications For Starling Extended Mission$647K
Sep 2024Federal contractDefense · Provide The Air Force Research Laboratory (afrl) With The Design And Construction Of A Medium Sized Ka-band Active Phased Array (apa) Satcom Terminal From Cesium Astro.$2.6M
May 2024Federal contractNASA · Lunanet Augmented Forward Signal (afs), Compatible Navigation Sensors$435K
Feb 2024Private capital raisedForm D · SEC · 6th filing$30M
Jan 2023Private capital raisedForm D · SEC · 5th filing$2.1M
Mar 2022Private capital raisedForm D · SEC · 4th filing$60M
Oct 2020Private capital raisedForm D · SEC · 3rd filing$14M
Jan 2019Private capital raisedForm D · SEC · 2nd filing$8.5M
May 2017Private capital raisedForm D · SEC · 1st filing$1.8M

Show 22 earlier federal awards

Sep 2023Federal contractNASA · Next Space Technologies For Exploration PARTNERSHIPS-2 (next STEP-2) Cis Capabilities Studies For Wideband/phased Array/crosslink$396K
Sep 2023Federal contractNASA · SBC-1461 Hardware Development Kit S-SBC1461-DK-0$54K
Aug 2023Federal contractNASA · This Is For The Purchase Of An Sdr Development Kit And Sdr Board Support Package$75K
Jun 2023Federal contractDefense · MQ-9 Reaper Sequential Tacfi SBIR Phase II Open Phased Array Antenna$1.8M
May 2023Federal contractNASA · E014042 SBIR Phase III Commercial-scale Arrays For Lunar Exploration: Communications And Sensing System$90K
Sep 2022Federal contractNASA · Skout Leo Flight Test$15K
Sep 2022Federal grantDefense · Phase II · Multibeam L-Band Active Phased Array$1.7M
Jul 2021Federal grantNASA · Phase II · Commercial-Scale Arrays for Lunar Exploration: Communications and Sensing System$749K
Jul 2021Federal contractNASA · Commercial-scale Arrays For Lunar Exploration: Communications And Sensing System$839K
Mar 2021Federal grantDefense · Phase II · Active Phased Array communications for UAS$750K
Mar 2021Federal contractDefense · Active Phased Array Communications For Unmanned Aerial Systems$750K
Sep 2020Federal contractNASA · An S-band Communications System$578K
Aug 2020Federal contractNASA · Commercial-scale Arrays For Lunar Exploration: Communications And Sensing System$125K
Mar 2020Federal contractDefense · Vireo Multi-beam Active Phased Array$50K
Feb 2020Federal contractNASA · Single Board Computer And Communications Controller$100K
Sep 2019Federal contractDefense · Research And Development$750K
Jun 2019Federal contractNASA · Ka-band Antenna Electronically Steered$765K
Jun 2019Federal contractDefense · SBIR Phase II Research And Development (r&d) For High Speed Missile To Missile Communications$999K
Sep 2018Federal contractNASA · STARLING1 Program Has Requested An SBIR Phase III With Cesium Astro Based On The Existing SBIR Phase 1 For A Software Reconfigurable And Mechanically Adaptable Tactical Communications Payload As Well As The Internally Invested Work On Development Of Our Core Communication Systems Hardware. The Identified Components Are A Software Defined Radio (sdr) Module, 2 Transmit/receive Modules (trm) Each Of Which Will Include 4 Low-noise Amplifiers (lna) And 4 Power Amplifiers (pa) With A Combined Output $1.9M
Jun 2018Federal grantDefense · Phase I · Rapidly Integrated Tactical Communications Payload$125K
Jun 2018Federal contractDefense · Progress Report$225K
Nov 2017Federal grantDefense · Phase I · High Speed Missile to Missile Communications$149K

Node area is scaled to amount. Form D reports securities sold, which can differ from an announced round; filings are numbered in the order they were made.

Standing among 155 peers

Line = median

Aerospace · Satellite · Device

Federal grantsBelow median
Granted patents#46 · top 30%

Cumulative measures favor older companies. Rankings describe position today, not outcome. Below the median, ranks show as a band rather than a number.

Founders and team

Researcher links verified by same-company patents and grants

Shey SabripourResearcherExecutive Officer, DirectorLinked by 1 patent · $274K in grants as PI
Chris Pappas IIIExecutive OfficerNamed in SEC Form D filings
Christopher O'DonnellDirectorNamed in SEC Form D filings
Daniel SableDirectorNamed in SEC Form D filings
Jonathan HodockDirectorNamed in SEC Form D filings
Kenneth SmithExecutive OfficerNamed in SEC Form D filings

Show all 13 people

Krystle CaponioExecutive OfficerNamed in SEC Form D filings
Phillip SarofimDirectorNamed in SEC Form D filings
Thomas DHalluinDirectorNamed in SEC Form D filings
Thomas D?HalluinDirectorNamed in SEC Form D filings
Thomas D'HalluinDirectorNamed in SEC Form D filings
Victor See, Jr.DirectorNamed in SEC Form D filings
Wen HsiehDirectorNamed in SEC Form D filings

What it has protected

USPTO · 3 granted of 15

May 21, 2026PendingConfigurable Radio Frequency Front-End to Support TTC and ISL Satellite LinksUSPTOApplication 17961675
Apr 2, 2026PendingSystems and methods of Efficient Fractional Delay FilteringUSPTOApplication 17870634
Mar 24, 2026GrantedAntenna System Architecture with Calibration Feedback Routing for Per Element Calibration with Digital BeamformerUSPTOUS 12,586,924

Show all 15 patent records

Configurable Radio Frequency Front-End to Support TTC and ISL Satellite LinksMay 21, 2026 · Application 17961675Pending
Systems and methods of Efficient Fractional Delay FilteringApr 2, 2026 · Application 17870634Pending
Antenna System Architecture with Calibration Feedback Routing for Per Element Calibration with Digital BeamformerMar 24, 2026 · US 12,586,924Granted
Controller Configured to Improve DC Power Consumption of Phased Array AntennasFeb 26, 2026 · Application 16711283Pending
Temporally and Geographically Adaptive Satellite Constellation Network ManagementFeb 26, 2026 · Application 17474890Pending
Hybrid Digital Delay Beamforming Circuits and MethodsFeb 19, 2026 · Application 18648320Pending
Power-Efficient Antenna Array Control ArchitectureFeb 12, 2026 · Application 18236488Pending
Low Earth Orbit Satellite Constellation SystemJan 29, 2026 · Application 19349024Pending
Active Phased Array with Integrated Antennas and Circuits on Common Printed Circuit CardsJan 27, 2026 · US 12,537,314Granted
Low Earth Orbit Satellite Constellation SystemNov 4, 2025 · US 12,463,716Granted
Blind Direction of Arrival Estimation Systems and MethodsJul 17, 2025 · Application 18236438Pending
Power-Efficient Antenna Array Control ArchitectureApplication 63400026Pending
Blind Direction of Arrival Estimation Systems and MethodsApplication 63400030Pending
Antenna System Architecture with Calibration Feedback Routing for Per Element Calibration with Digital BeamformerApplication 63399986Pending
Hybrid Digital Delay Beamforming Circuits and MethodsApplication 63462243Pending

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QED SECURE SOLUTIONS LLCSimilar federal contract value in Aerospace · $13.4M in contracts
SCIAKY INCSimilar federal contract value in Aerospace · $13M in contracts
PROTOINNOVATIONS, LLCSimilar federal contract value in Aerospace · $12.9M in contracts

Regulatory activity · Aerospace

Sector-level, not company-level

06 Jul 2026Nondiscrimination in Federally Assisted Programs of NASA-Effectuation of Title VI of the Civil Rights Act of 1964National Aeronautics and Space Administration
01 Jul 2026Special Conditions: AMAC Aerospace, The Boeing Company Model 747- 8 Airplane; Side-Facing SeatsFederal Aviation Administration
26 Jun 2026Standard Instrument Approach Procedures, and Takeoff Minimums and Obstacle Departure Procedures; Miscellaneous AmendmentsFederal Aviation Administration
23 Jun 2026Operating Limitations at John F. Kennedy International AirportFederal Aviation Administration
23 Jun 2026Operating Limitations at New York LaGuardia AirportFederal Aviation Administration
18 Jun 2026Special Conditions: Honeywell Aerospace US LLC, Dassault Aviation Model Falcon 900EX Airplane; Electronic System Security Protection From Unauthorized External AccessFederal Aviation Administration

Rules are matched to sector, not to company. Recent activity in a sector is context rather than a signal about this business — until rules are matched to what a company actually builds, the section is shown as context and nothing more.

Sources

Federal grants from SBIR/STTR, NIH, NSF and DoD records. Federal contracts from USAspending.gov. Private capital from SEC Form D. Patents from USPTO. Publications from OpenAlex. Regulatory activity from the Federal Register. Press matched on company name.

How to read this page

Figures show associations in public records, not causes or predictions. Nothing here is investment advice. An em-dash means no record was found under this company's name, not that none exists.

Data freshness

SEC Form D filings through Oct 23, 2026. SBIR and STTR awards through Oct 21, 2026.