AST SpaceMobile jumped on a Berenberg buy call while distressed Comtech paced the ground-segment tape lower.

AST SpaceMobile (ASTS) was the standout, up 11.8% to $62.40, on a clean pile of catalysts. Berenberg initiated coverage with a Buy rating and a $92 price target; an SEC Form 4 disclosed director Adriana Cisneros buying shares around $57–59; and the constellation itself keeps advancing, with BlueBird satellites 11–13 pushing the network toward beta space-based cellular broadband later this year at peak rates near 200 Mbps to standard phones. AST sits on the ground-segment and direct-to-device chokepoint — the strait where a satellite talks straight to an unmodified handset — and on a day the analyst, insider and operational signals all pointed the same way, it repriced sharply higher.

The other end of that same chokepoint was the drag. Comtech (CMTL) fell 4.5% to $1.50, the basket's worst, extending a slide in a distressed satellite-and-ground-communications name trading below its recent 52-week low of $1.59, with a book-to-bill of 0.92 — orders coming in below shipments — signaling a slowdown even as management pointed to improved liquidity near $51M. It is the cautionary mirror image of AST: the same ground-segment strait, priced for balance-sheet risk rather than growth.

The rest of the tape leaned to the winners. Viasat (VSAT) rose 5.5% to $69.92, extending a multi-session rally on its ViaSat-3 F3 satellite entering service and a U.S. Space Force build-and-launch award — the ground-and-optical-terminal chokepoint bid on real contract flow. Planet Labs (PL) added 3.8% to $19.99 on the earth-observation strait ahead of its own print, and SiTime (SITM) +2.9% to $568.82 on the space-timing chokepoint. The soft side was the primes and materials: Northrop Grumman (NOC) −1.7% to $523.82, CACI −2.4% to $614.27, and 5N Plus (FPLSF) −2.4%.

The near-term calendar is busy. Planet Labs reports Q2 FY2027 on September 14, the next hard read on the earth-observation chokepoint. Astroscale's APS-R Space Force refueler is set to launch to GEO on September 15 — a live test of the in-space-servicing strait. L3Harris's majority sale of its Aerojet Rocketdyne/RL10 propulsion line is expected to close around quarter-end, reshaping the propulsion chokepoint. And the SpaceX IPO's 180-day lockup fully expires December 9, the event that begins to put a continuous public price on the private giant at the center of launch.