| Krasniy Oktyabr Mash, St-Peterberg im. Klimov (Krasniy Oktyabr) |
 Russia |
Commercial |
1912 |
0 |
0 |
0 |
| Krasnoyarksiy Mash Zavod (KrasMash) |
Russia |
Commercial |
1935 |
0 |
0 |
0 |
| Kratos Defense and Security Solutions (Kratos) |
 United States |
Commercial |
2003 |
0 |
0 |
0 |
| Kubos Corp. (Kubos) |
 Iceland |
Commercial |
2016 |
0 |
0 |
0 |
| Kuibyshev Aviation Institute (KAI) |
|
Commercial |
1942 |
0 |
0 |
0 |
| Kyoto University (Kyoto) |
 Japan |
Academic / research |
1869 |
0 |
0 |
0 |
| Kyushu University (Kyushu U.) |
Japan |
Academic / research |
1903 |
0 |
0 |
0 |
| L-3 Communications, Electron Technologies Inc. (L3 ETI) |
United States |
Commercial |
2005 |
0 |
0 |
0 |
| L'Garde Inc. (L'Garde) |
United States |
Commercial |
1971 |
0 |
0 |
0 |
| L3, Electron Devices Division (L3 EDD) |
United States |
Commercial |
2016 |
0 |
0 |
0 |
| L3Harris Electron Devices (L3H ED) |
United States |
Commercial |
2018 |
0 |
0 |
0 |
| L3Harris Missile Solutions, RS-25 unit (L3H Missiles) |
United States |
Commercial |
2026 |
0 |
0 |
0 |
| L3Harris Space and Intelligence Systems (L3Harris SIS) |
United States |
Commercial |
2019 |
0 |
0 |
0 |
| Laboratoire Centrale de Telecommunications (LCT) |
 France |
Government / agency |
1927 |
0 |
0 |
0 |
| Laboratoire de Physique de L'Atmosphere, Univ. Paris (LPA) |
France |
Government / agency |
1955 |
0 |
0 |
0 |
| Laboratoire de Physique et Chimie de l'Enivronnement et de l'Espace (LPC2E) |
France |
Academic / research |
|
0 |
0 |
0 |
| Lacuna Space (Lacuna Space) |
 United Kingdom |
Commercial |
2019 |
0 |
0 |
0 |
| Lagrapo Co. Ltd. (Lagrapo) |
Japan |
Commercial |
|
0 |
0 |
0 |
| Lambda Team (Lambda Team) |
United States |
Academic / research |
2014 |
0 |
0 |
0 |
| Land Economic Group (Land Group) |
 China |
Commercial |
1985 |
0 |
0 |
0 |
| Land Launch (LL) |
Russia |
Commercial |
|
0 |
0 |
1 |
| Landspace Hongqing (Xiongan) Space Tech Co Ltd. (Hongqing Xiongan) |
China |
Commercial |
|
0 |
0 |
0 |
| Lanteris (Lanteris) |
United States |
Commercial |
2025 |
0 |
0 |
0 |
| LAPAN Rocket Motor Lab (LAPAN RML) |
 Indonesia |
Government / agency |
|
0 |
0 |
0 |
| Latitude (LAT) |
France |
Commercial |
2019 |
0 |
0 |
1 |
| Laxman Gyanpith School (Laxman Gyanpith) |
 India |
Academic / research |
1992 |
0 |
0 |
0 |
| LCF Enterprises (LCF) |
United States |
Commercial |
1986 |
0 |
0 |
0 |
| Lebanon Rocket Society (LRS) |
 Lebanon |
Government / agency |
1960 |
0 |
0 |
0 |
| Leesona Moos Laboratories (Leesona-Moos) |
United States |
Commercial |
1961 |
0 |
0 |
0 |
| Leibnitz Institute for Atmospheric Physics (IAP) |
 Germany |
Academic / research |
1991 |
0 |
0 |
0 |
| Leicester University X-ray group (LUX) |
United Kingdom |
Academic / research |
1961 |
0 |
0 |
0 |
| Leidos (Leidos) |
United States |
Commercial |
2013 |
0 |
0 |
0 |
| Letno-issledovatel'skiy institut im. M.M. Gromov (LII) |
Russia |
Government / agency |
1941 |
0 |
0 |
0 |
| Li Da Education Technology Group YG (Lida) |
China |
Commercial |
2018 |
0 |
0 |
0 |
| Liangxi Aerospace Tech Group (Liangxi) |
China |
Commercial |
|
0 |
0 |
0 |
| Lichuan Municpal People's Government (Lichuan) |
China |
Government / agency |
|
0 |
0 |
0 |
| Liftero (Liftero) |
 Poland |
Commercial |
2022 |
0 |
0 |
0 |
| Ligado Networks (Ligado) |
United States |
Commercial |
2016 |
0 |
0 |
0 |
| LinaSpace LLC (LinaSpace) |
United States |
Commercial |
2016 |
0 |
0 |
0 |
| Lincoln Labs, Mass. Inst of Technology (MIT-LL) |
United States |
Academic / research |
1951 |
0 |
0 |
0 |
| Ling-Temco-Vought Missile Systems (LTV) |
United States |
Commercial |
1962 |
0 |
0 |
0 |
| Link Space Aerospace Technology (Link Space) |
China |
Commercial |
2014 |
0 |
0 |
0 |
| Lirui Tech Co Ltd. (Hubei) (Lirui Keji) |
China |
Commercial |
2025 |
0 |
0 |
0 |
| Lithuanian Space Association (LSA) |
 Lithuania |
Government / agency |
2010 |
0 |
0 |
0 |
| Lizheng Satellite Application Technology Co. Ltd. (Lizheng Sat) |
China |
Commercial |
2012 |
0 |
0 |
0 |
| Lockheed Aircraft Corporation (Lockheed) |
United States |
Commercial |
1932 |
0 |
0 |
0 |
| Lockheed Martin Space Operations (LMSO) |
United States |
Commercial |
|
0 |
0 |
0 |
| Lockheed Propulsion Co (LPC) |
United States |
Commercial |
1961 |
0 |
0 |
0 |
