# SDA Seeks Tranche 4 Tracking Technologies

The Space Development Agency (SDA) issued a request for information to shape the Tranche 4 Tracking Layer acquisition for the Proliferated Warfighter Space Architecture. It seeks industry input on technologies for tracking maneuvering hypersonic and cruise missiles throughout their flight trajectories, as well as Tracking Layer enhancements and potential short-term on-orbit demonstrations and operations. Responses are due **December 4, 2026, at 12:00 p.m. ET (42 days remaining)**. SDA plans a later Tranche 4 solicitation that may include production contracts and rapid-prototyping and flight-demonstration opportunities.

- Companies with relevant missile-warning and tracking payloads, architecture, integration, or demonstration capabilities can review the SAM.gov opportunity and request the additional mission details.
- The RFI is an opportunity to inform future production requirements and demonstration plans; it is not itself a contract award or a guarantee of a later solicitation.
- The extracted procurement context includes a $3.5 billion Tranche 3 tracking-satellite procurement and a separate July 2026 procurement of 36 accelerated tracking satellites valued at $1.75 billion, indicating substantial related investment in missile-defense tracking.

**Jurisdictions:** federal
**Industries:** Defense & Military
**Topics:** Digital Infrastructure
**Published:** October 22, 2026

### Government Entities
- Space Development Agency (SDA)
- United States Space Force, Portfolio Acquisition Executive for Missile Warning and Tracking (USSF)

### Sources
- [Space Development Agency Solicits Technologies for Tranche 4 Missile-Tracking Constellation – SatNews](https://satnews.com/2026/10/22/space-development-agency-solicits-technologies-for-tranche-4-missile-tracking-constellation) - SatNews Publishers
- [SDA Issues Request for Information for Tracking Layer Tranche 4 On-Orbit Demonstrations and Operations – Space Development Agency](https://www.sda.mil/sda-issues-request-for-information-for-tracking-layer-tranche-4-on-orbit-demonstrations-and-operations) - Space Development Agency (SDA) (.mil)