Phase Four - About the company
Phase Four is a series C company based in Pasadena (United States), founded in 2015 by j Sheehan. It operates as a Manufacturer of propulsion systems for space applications. Phase Four has raised $43.6M in funding from New Science Ventures and Alsop Louie Partners. The company has 121 active competitors, including 34 funded and 5 that have exited. Its top competitors include companies like Avio, SpaceFields and X-Bow Systems.
Company Details
Manufacturer of propulsion systems for space applications. It provides users with a platform that develops plasma propulsion systems for small satellites that include electrodeless RF thrusters. It also develops iodine-based plasma propulsion systems.
- Website
- phasefour.io
- Social
- Registered Address
- El Segundo, California
Key Metrics
Founded Year
2015
Location
Pasadena, United States
Stage
Series C
Total Funding
$43.6M in 6 rounds
Latest Funding Round
Investors
Ranked
8th among 121 active competitors
Employee Count
23 as on Jun 30, 2026
Legal entities associated with Phase Four
Phase Four is associated with 2 legal entities given below:
Legal Entity Name | Date of Incorporation | Revenue | Latest Employee Count | Documents |
|---|---|---|---|---|
PHASE FOUR INC CIN: 473122544 , United States, Active | Dec 26, 999 | - | 25 (As on Dec 31, 2024) | - |
Phase Four, Inc. CIN: 1662786 , United States, Active | $1 - $1M (As on Jan 05, 2016) | - | - |
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Phase Four's funding and investors
Phase Four has raised a total funding of $43.6M over 6 rounds. Its first funding round was on Jan 05, 2016. Its latest funding round was a Series C round on Jan 06, 2025 for $*****. 1 investor participated in its latest round. Phase Four has 12 institutional investors.
Here is the list of recent funding rounds of Phase Four:
Filter this list
Filter this listDate of Funding | Funding Amount | Round Name | Post-Money Valuation | Revenue Multiple | Lead Investors | Other Investors |
|---|---|---|---|---|---|---|
Jan 06, 2025 | 8236339 | Series C | 3869620 | 8300677 | 1017283 | 8948058 |
Apr 27, 2023 | 9335244 | Series C | 7166269 | 1364828 | 5558035 | |
Jun 11, 2021 | 1206277 | Series B | 6723257 | 7912569 | 8055365 |
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Phase Four's founders and board of directors
Founder? Claim ProfileThe founders of Phase Four is j Sheehan.
Here are the details of Phase Four's key team members:
- j Sheehan: Founder & Lead Physicist of Phase Four.
Phase Four's Board of Directors
Phase Four's board has 9 active members. Stewart Alsop, Somu Subramaniam, Jason Wallace, STEPHEN KISER, THOMAS J.A. LAVIN, Beau Jarvis, JAMES BRIDENSTINE, Simon Halpern and Andrew Krowne are independent board members.Here is the list of Phase Four's board of directors:
Name | Type | Representing | Status | Duration |
|---|---|---|---|---|
Independent board member | - | Current | 10y 6m | |
atnkqwf | Independent board member | - | Current | 9y 1m |
{om{yfn | Independent board member | - | Current | 7y 7m |
dtimunn | Independent board member | - | Current | 8y 6m |
odhbpfx | Independent board member | - | Current | 3y 6m |
zaounzo | Independent board member | - | Current | 5y 2m |
atqhlzf | Independent board member | - | Current | 4y 1m |
{ktgwzm | Independent board member | - | Current | 1y 5m |
qmuaftc | Independent board member | - | Current | 6y 1m |
View details of Phase Four's Founder profiles and Board Members
Phase Four's employee count trend
Phase Four has 23 employees as of Jun 26. Here is Phase Four's employee count trend over the years:
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Phase Four's Competitors and alternates
Top competitors of Phase Four include Avio, SpaceFields and X-Bow Systems. Here is the list of Top 10 competitors of Phase Four, ranked by Tracxn score:
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Rank | Company Details | Short Description | Total Funding | Investors | Tracxn Score |
|---|---|---|---|---|---|
1st | Developer of space propulsion components and systems | $19.8M | 63/100 | ||
2nd |  SpaceFields 2021, Bengaluru (India), Seed | Developer of custom solid propulsion systems for aerospace and defense | $6.71M | 60/100 | |
3rd |  X-Bow Systems 2016, Albuquerque (United States), Series B | Manufacturer of solid rocket motors and provider of flight services | $157M | 60/100 | |
4th | Ursa Major 2015, Berthoud (United States), Series E | Provider of turnkey propulsion solutions for a wide range of vehicles | $497M | 60/100 | |
5th |  Manastu Space 2017, Mumbai (India), Series A | Developer of green propulsion systems and debris collision avoidance technology | $6.71M | 60/100 | |
6th |  Arkadia Space 2020, Castellon de la Plana (Spain), Series A | Developer of green propulsion systems and thrusters for space vehicles | $16.9M | 59/100 | |
7th | Dawn Aerospace 2017, Christchurch (New Zealand), Series B | Developer of propulsion systems for satellites, spaceplanes, and orbital transfer | $47.3M | 58/100 | |
8th | Phase Four 2015, Pasadena (United States), Series C | Manufacturer of propulsion systems for space applications | $43.6M | 56/100 | |
9th | Bellatrix Aerospace 2015, Bengaluru (India), Series A | Provider of advanced satellite propulsion and in-space mobility solutions | $34.4M | 56/100 | |
10th | GATE Space 2022, Vienna (Austria), Series A | Developer of chemical propulsion systems for satellites, capsules, and landing vehicles | $7.72M | 53/100 |
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Phase Four's Investments and acquisitions
Phase Four has made no investments or acquisitions yet.
Reports related to Phase Four
Here is the latest report on Phase Four's sector:
News related to Phase Four
Filter this listMedia has covered Phase Four for a total of 2 events in the last 1 year.
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Apex Raises $200M in Series D at $1B+ Valuation, Led by Andreessen Horowitz and Point72 VenturesCaproasia•Sep 13, 2025•Apex, Andreessen Horowitz, Point72 Ventures, 8VC and 5 others
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Phase Four Accelerates Mission with Announcement of Distinguished Board of AdvisorsPR Newswire•Apr 06, 2024•Phase Four
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Veteran Ventures Capital Announces Fourth Investment with Phase Four, Inc.Tullahoma News•Apr 28, 2023•Veteran Ventures Capital, Phase Four
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