Amazon's 13F Portfolio Falls 14.7% to $3.77B in Q3 as All Six Positions Keep Their Share Counts
Rivian and X-energy account for about 88% of the book, and Marvell and Astera Labs fell 11.3% and 26.3% in value.
Amazon (AMZN) reported $3.77 billion of publicly disclosed holdings in its Form 13F for the third quarter of 2026, down $649 million, or 14.7%, from $4.42 billion in the second quarter. All six positions kept the same share counts as the prior quarter, so the decline reflects lower reported values, not disclosed net selling. A 13F values holdings at quarter-end prices, so it does not show where the stocks trade now.
The six positions
| Holding | Shares | Q2 value | Q3 value | Change |
|---|---|---|---|---|
| Rivian (RIVN) | 158.36M | $2.75B | $2.37B | -13.7% |
| X-energy (XE) | 65.84M | $1.21B | $934M | -22.7% |
| Beta Technologies (BETA) | 11.75M | $196.9M | About $260M | +31.9% |
| Marvell (MRVL) | 396,352 | $118.1M | About $105M | -11.3% |
| Astera Labs (ALAB) | 277,777 | $134.2M | About $99M | -26.3% |
| Allegiant Travel (ALGT) | 149,317 | $17.6M | $11.3M | -35.6% |
By our calculation, Rivian and X-energy together are about 88% of the Q3 total, and the implied quarter-end prices were about $15.0 for Rivian, $14.2 for X-energy, $22.1 for Beta, $264 for Marvell, $356 for Astera and $75.7 for Allegiant. Where Q3 values and changes are marked by our calculation, they are derived from the second-quarter filing and the reported percentage changes.
What stands out
- No trades. Share counts match the second-quarter filing exactly, down to the 149,317 Allegiant shares, so Amazon neither bought nor sold any disclosed position.
- Concentration. Rivian remains the largest position, followed by X-energy.
- AI and technology. Marvell and Astera Labs, both AI-infrastructure names, fell in value, while Beta Technologies gained.
- What it leaves out. A 13F covers only certain publicly traded securities. It does not include private holdings.
What to watch
- Next filing. Whether Amazon changes share counts in the fourth-quarter filing, due in February.
- Current prices. How the holdings have moved since Sept. 30.
- Marvell. The pending Lumentum acquisition, which we covered separately.
- Related coverage. See our reports on Marvell and Lumentum, the Anthropic S-1 amendment and the Nasdaq analysis.
Sources: Amazon's Form 13F filings on SEC EDGAR, including its second-quarter 2026 report, and Amazon's investor relations site. Third-quarter values and percentage changes come from the reported filing details and may be rounded. Items labeled by our calculation are our own arithmetic. This article is informational only and is not investment advice.
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