Rocket Lab stock is taking a hit today. What’s weighing on RKLB shares?

SpaceX’s Blockbuster DealAccording to a Form 8-K filed Tuesday, June 16, 2026, SpaceX has agreed to acquire AI coding startup Anysphere Inc (Cursor) in an all-stock deal valued at an implied equity value of $60 billion. The transaction, executed via SpaceX subsidiary X67 Inc., is slated to close in the third quarter of 2026, subject to customary regulatory approvals.While Rocket Lab continues to scale its own launch manifests and Neutron rocket development, SpaceX's multi-billion-dollar expansion into AI software highlights the intensifying competition for aerospace capital. For today, investors appear to be recalibrating their portfolios, leaving RKLB in the red while digesting its rival’s massive tech expansion.Critical Price Levels To Watch For Rocket LabFrom a longer-term trend view, Rocket Lab is still in a bullish structure: it's trading about 43% above its 200-day SMA ($72.92) and about 20% above its 100-day SMA ($86.89). The near-term picture is choppier, though, with the stock about 16% below its 20-day SMA ($124.13), which often acts like "gravity" after a sharp run.Momentum is best explained by RSI, which is sitting at 47.81—neutral and consistent with a cooling phase rather than a fresh breakdown. RSI measures how stretched a move is, and this reading suggests the stock is working off prior heat after the May swing high and 52-week high.The moving-average stack still leans constructive (20-day SMA above the 50-day SMA; 50-day SMA above the 200-day SMA), but price is now only about 2.6% above the 50-day SMA ($101.57), making that zone a key "line in the sand" for trend traders. If buyers defend it, the pullback can stay in "reset" mode; if not, the next test tends to shift toward the 100-day area.