Lighter-Than-Air Funding 2016–2026: $1.03B Across 40 Companies

We counted every disclosed external financing round of lighter-than-air (LTA) companies from January 2016 to mid-October 2026: tethered aerostats and helikites, free-flying stratospheric balloons, and airships. The total is $1.03 billion across 122 deals and 40 companies. That is less than half of the single round Anduril raised in June 2025 ($2.5B), and below Helsing's July 2026 round (€1.6B).

What we counted

The universe is 153 companies whose core product is lifted by a gas lighter than air. Heavier-than-air stratospheric aircraft (Zephyr/AALTO, Skydweller and similar) and tethered drones are not included. For each company we checked press releases, SEC Form D filings, UK Companies House share allotments, French BODACC/Pappers records, other national registries, and investor databases. Grants and government contracts are excluded; equity, convertibles, venture debt, crowdfunding and corporate strategic investments are included. M&A is tracked separately. An independent pass re-checked 96 deals against their sources; 16 were corrected.

The $1.03B is a floor. Another 46 deals in the period have no published amount, including Sceye's Series C (2024), the first close of World View's Series D (2024) and Space Perspective's 2023–24 rounds. 113 of the 153 companies have no disclosed external money at all.

Distribution

• Flying Whales (France, 60-tonne cargo airship) raised about $298M, 29% of the total. Most of it came from the French state, Investissement Québec and French corporates (ADP, Bouygues, Air Liquide, CMA CGM).
• Loon (Alphabet) received $125M from SoftBank's HAPSMobile in April 2019, with a reciprocal $125M option. Alphabet shut Loon down in January 2021.
• Flying Whales, Loon and World View together account for 49% of the total; the top ten for 87%.
• By segment: airships $496M (48%), stratospheric balloons $456M (44%), tethered aerostats $74M (7%).

There is no steady growth line. 2019, 2022 and 2026 are the peaks, and each is defined by one or two transactions. The median round size rose from about $1.5M (2016–19) to about $3.9M (2023–26) in nominal dollars, counting equity rounds only.

Tethered aerostats

Tethered aerostats are the LTA segment with the widest operational use: border surveillance, base protection, communications relay, and current use on both sides of the war in Ukraine. Over ten years, startups in this segment disclosed $74M. Altaeros (US) accounts for $56M of it, mostly through SEC-filed equity and notes. The rest is Drone Aviation's insider placements before its 2019 reverse merger, a 2016 Aerophile round, and three amounts of $1.5M or less (ALTAVE, Lium, Tethercells).

The established tethered manufacturers do not appear in venture data. TCOM, Allsopp Helikites and A-NSE are financed by contracts and their owners. Hemeria's aerostat unit (ex-Airstar) changed hands twice: CNIM bought 85% of the then-distressed Airstar for €1.7M in 2019, and HEMERIA acquired it in 2022.

Who invested

Allocating each deal equally among its named investors, venture funds account for about 30% of the money, telecom strategics for 17% (almost entirely the HAPSMobile–Loon deal), other corporates for 17%, and public funds for 16% (almost entirely Flying Whales). Investors with a defence mandate appear late and in small amounts: Definvest (the French Ministry of Armed Forces fund) held 15% of CNIM Air Space by 2022, Sierra Nevada Corporation led World View's Series D in 2024, and in April 2026 the NATO Innovation Fund led Kelluu's €15M Series A, the first LTA round led by a multinational defence fund.

Exits

• Ondas → World View (closed 1 April 2026): announced at $150M, paid mainly in Ondas shares (up to 12.78M) plus about $7.3M in cash toward obligations. World View had raised about $91M since 2013, excluding undisclosed Series D tranches.
• TCOM → Aerostar (2022, carved out of Raven/CNH): price not disclosed.
• EOS-X → Space Perspective (2025): acquired after the company stopped operations; Space Perspective had raised at least $64M.
• Closures and liquidations include Loon (2021), Stratxx (2018–22), StratoBooster (2025) and Lindstrand Technologies (in liquidation since 2023).

Assessment

Disclosed LTA financing over ten years is about $1B, concentrated in a few companies that targeted cargo, stratospheric telecom and near-space tourism. Tethered aerostats, the most widely fielded military LTA systems, received 7% of it, and most of the segment runs on contract revenue rather than venture capital. Defence-mandated investors started appearing in LTA rounds from 2024; the amounts are still small relative to defence-tech funding overall, which PitchBook puts at $49.1B for 2025.

Disclosure: Aerobavovna is one of the 153 companies in the dataset. Its April 2026 round led by Pravo Ventures has no published amount and is not included in the totals.

Method and limits

• Amounts are converted to USD at the rate on the deal date; nominal, not inflation-adjusted. 2026 covers 9.5 months.
• SEC Form D totals can include conversions of earlier notes; where we found overlap we counted the money once.
• Excluded from totals: EOS-X Space's reported $140M Series D (May 2026; single source, no named investors), database-only figures for Zephalto, and whole-company acquisitions where LTA is a minor business (CNH–Raven Industries, Ingersoll Rand–ILC Dover).
• Coverage of Chinese and Russian companies is limited; most Chinese LTA rounds are reported only as ranges.

Sources: company press releases; SEC EDGAR Form D and 8-K filings (Altaeros, World View, Urban Sky, WindBorne, H2 Clipper, Ondas); UK Companies House (Hybrid Air Vehicles, Varialift, Straightline Aviation, B2Space); BODACC/Pappers (Flying Whales, Zephalto, Lium, aérOnde); French Commission des participations et des transferts, avis 2026-A-1 (Flying Whales); Gazette officielle du Québec, décrets 952-2019 and 1041-2022; CNIM H1-2019 report; Trinity Capital filings (Space Perspective); Reuters, TechCrunch, tech.eu, Munich Startup (Anduril, Helsing); Defense News (2025 defence-tech funding).