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Long Wall
Deployable missile defense and hypersonic flight-test systems (formerly ABL Space Systems)
About Long Wall
Long Wall, previously known as ABL Space Systems, is an American aerospace and defense company building deployable missile defense and hypersonic flight-test systems for the U.S. military. Founded in 2017 in El Segundo, California by Harry O'Hanley and Dan Piemont — former SpaceX and Morgan Stanley employees — the company originally set out to make small-satellite launch more flexible, reliable, and affordable, offering a containerized, rapidly deployable launch vehicle (RS1) and ground system.
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After a series of technical setbacks including two failed orbital launches in 2023 and 2024, and facing intense competition from SpaceX and Rocket Lab, the company announced in November 2024 that it was exiting the commercial launch market and pivoting to defense applications. In February 2025, CEO Dan Piemont announced the rebrand to Long Wall — a name inspired by the Long Walls that protected ancient Athens — to reflect its sharpened focus on national defense.
Today Long Wall repurposes its launch heritage for the U.S. Department of Defense. Its RS1 rocket has evolved into the RSX vehicle, used as a hypersonic flight-test bed and a 'threat replicator' target to test missile-defense systems, while its GS0 containerized ground system has been rebranded as Ironwood for responsive, deployable launch. In December 2025 the company unveiled Cyclops, a surface-launched, exoatmospheric interceptor designed to defeat missiles in the midcourse phase of flight at a fraction of the cost of legacy interceptors such as the Navy's SM-3.
Long Wall remains committed to U.S.-made manufacturing and to serving government and defense customers, positioning itself within a broader wave of space startups shifting toward defense amid rising geopolitical tensions and growing Pentagon interest in hypersonic and missile-defense capabilities.
At a glance
- Status
- Operational
- Founded
- 2017
- Headquarters
- Long Beach, United States
- Employees
- 55
- Open positions
- 11
- Dealroom signal
- 65.8/100
- Industry
- Security
- Sector
- Space, Defence, Weapons, Aviation and Aerospace, Space Tech, Verified Unicorns and $1B Exits, NIF defense security and resilience, NIF freedom of operations and mobility, DT and LS, science-based
- Technology
- Hardware, Deep Tech
- Business model
- Manufacturing
- Client focus
- b2b
Knowledge graph
More headlines
Funding history
Company financing events and reported valuations.
| Deal type | Date | Amount | Valuation | Investors | Source |
|---|---|---|---|---|---|
| DEBTDebt | May 2024 | $20M | — | LEONID | ↗ |
| LATE VCOther financing | Dec 2023 | $41M | $2.4B | Undisclosed | ↗ |
Growth signals
Latest recorded traffic for Long Wall is 3.9K monthly website visits, down 54.1% over the last three months. Long Wall's team declined 12.7% over the past year.
Open positions
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Investments and acquisitions
Recent portfolio relationships for companies that also act as investors or acquirers.
Investors
From Dealroom's funding and investor records, grouped by the round each investor first entered.
Seed2 investors entered at this stage
Air Force Research Lab
AFWERX
Series A8 investors entered at this stage
Lockheed Martin Ventures
Venrock- EBEthan Batraski
New Science Ventures
Lynett Capital
T. Rowe Price
Fidelity Investments
The Syndicate
Series B and later2 investors entered at this stage
US Space Force
LEONID
Other known investors9 additional known investors
8VC
Andreessen Horowitz
Benjamin Lynett
In-Q-Tel- JFJam Fund
JAM Fund- JMJohn McCormick
Lux Capital
Small Business Innovation Research
Source: Dealroom Talent Intelligence.
Global footprint
team presence
Market sentiment
An AI-synthesised read of the highest-engagement posts about Long Wall on X, ranked by likes and reposts, corporate channels excluded.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
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