Satrec Initiative Co., Ltd. (Satrec I; Korean: 쎄트렉아이; RR: Sseteurek Ai) or SI is a South Korean satellite manufacturing company headquartered in Daejeon, South Korea[3] The company was founded in 1999 by the engineers who developed the first Korean satellite (KITSAT-1) at KAIST SaTRec (Satellite Technology Research Center).

The company designs and builds Earth observation satellites called SpaceEye-series, and it provides various space components, including high resolution electro-optical payloads and star-trackers.

[4] SpaceEye-X provides the capability to accommodate various payloads, including SAR antennas.

[7] SI provides Hall-effect electric propulsion systems (HEPS) optimized for small satellite missions.

[8] SI develops and manufactures star trackers that have enormous flight heritages.