SPCX Jumps 4.45% as Alphabet, Nvidia, Fidelity Reveal Post-IPO Stakes Worth $115B+

SpaceX shares (Nasdaq: SPCX) advanced 4.45% to close at $146.23 on August 17, 2026, on volume of roughly 114.9 million shares, as a wave of mid-August Form 13F filings (reporting positions as of June 30, 2026) revealed the company's largest institutional shareholders for the first time since its June 12 IPO. Alphabet topped the list with about 551.2 million shares worth roughly $94 billion, followed by Fidelity (FMR LLC) with 302.6 million shares, Gigafund with 171.8 million, Saudi Arabia's Public Investment Fund with 154.1 million, and Nvidia with 122.8 million shares worth about $21 billion — a stake traced to Nvidia's earlier investment in xAI. Advanced Micro Devices disclosed a SpaceX position for the first time, worth roughly $565.5 million. Harvard Management Company reported 12.9 million shares worth about $2.2 billion, making SpaceX its largest publicly disclosed U.S. equity holding at over half its domestic stock portfolio. Just 23 investment managers holding more than 10 million shares each controlled about 83% of all reported holdings, while nearly 1,340 smaller investors with sub-100,000-share stakes together held less than 1%. The filings also confirmed new positions from Darsana Capital Partners, Viking Global Investors, and PRIMECAP Management. SPCX has now gained about 22% over the trailing month, rebounding toward its $135 IPO price and $150 opening-day level, even as a further ~319 million-share unlock tranche was scheduled for August 20.