Just caught something interesting in the latest 13F filings that dropped mid-February. Alphabet's biggest investment bet isn't in AI or search -- it's actually AST SpaceMobile, and this thing has been absolutely wild.

So here's what's happening. When institutional investors with over $100 million AUM file their quarterly 13Fs, you get a real window into what the smart money is actually doing. Turns out Alphabet has about $650 million tied up in AST SpaceMobile, which represents roughly a quarter of their entire $2.6 billion investment portfolio. That's a massive concentration for a company of Alphabet's size.

The numbers tell you why everyone's paying attention. AST is up nearly 2,800% over the last two years. Two. Thousand. Eight. Hundred. Percent. And it's not just Alphabet chasing this -- 127 more institutional 13F filers were holding AST shares by end of December compared to September. There's serious institutional momentum here.

What makes this stock tick? Two main things. First, AST's BlueBird satellites actually work with your existing smartphone. Other companies tried building competing networks that required special hardware, but AST solved that problem. Second, and this is the kicker, they've partnered with over 50 global telecom providers representing nearly 6 billion subscribers. They're not fighting the incumbents -- they're working with them. That's a completely different game.

The growth story looks insane on paper. They're projecting revenues to go from around $59 million this year to nearly $3.1 billion by 2029. But here's where it gets tricky. A one-week satellite launch delay in December caused AST's stock to drop double digits. This company is dependent on execution -- satellite launches, innovation, keeping up with data demands. There's real execution risk.

Plus, the economics are tightening. Satellite production costs keep climbing, which is why they just raised $1 billion in convertible debt. That's dilution down the road. And when you're looking at a price-to-sales multiple over 10x based on 2029 revenue projections, you're basically pricing in perfection. All the growth, all the partnerships, all the execution has to go flawlessly.

So yeah, AST SpaceMobile is getting attention for good reasons -- the competitive moat is real and the 2,800% run-up reflects genuine conviction from serious investors. But the valuation is starting to feel stretched. It's one of those situations where the story is compelling but the stock price already reflects most of the upside. Worth watching, but maybe not at these levels.