David Tepper's Appaloosa Management disclosed a 40% portfolio weight across three positions in its latest 13F filing: Amazon, Micron Technology, and Taiwan Semiconductor Manufacturing Company. The allocation represents $3.1 billion of the fund's $7.7 billion in reportable equity holdings. Tepper has not run this degree of name-level concentration since his $1.8 billion Bank of America position in Q4 2012.
The filing shows Amazon as the largest holding at approximately $1.4 billion, Micron at roughly $950 million, and TSMC near $750 million. All three positions were increased during the quarter. Appaloosa added 2.1 million shares to its Amazon stake, 8.7 million shares to Micron, and 3.4 million ADRs to TSMC. The fund simultaneously reduced or exited 23 other positions, including complete exits from Meta Platforms and Nvidia.
The three names form a vertical stack in the AI infrastructure trade. Amazon supplies the cloud compute layer and increasingly its own Trainium chips. Micron manufactures high-bandwidth memory critical for AI accelerators. TSMC fabricates the leading-edge nodes that both hyperscalers and chipmakers depend on for performance density. Tepper is not betting on AI demand in the abstract — he is betting that margin expansion in this specific supply chain will outpace current consensus by enough to justify a 40% book.
The concentration creates asymmetric risk around two events. First, Micron reports fiscal Q2 earnings on March 19, and any guide-down on HBM shipment timing will pressure all three names given cross-elasticity assumptions. Second, TSMC's April 17 earnings call will clarify whether N3E yield improvements are translating to CoWoS capacity expansions ahead of schedule. If TSMC confirms incremental 15,000 wafer starts per month by Q3 as some supply-chain checks suggest, Appaloosa's thesis tightens. If the company walks back any portion of its $30 billion 2025 capex guide, the position becomes harder to defend at this weight.
Operators should note that Tepper's 13F does not capture any short positions, derivatives, or non-equity hedges. The disclosed long concentration may be partially offset by index puts or single-name collars that do not appear in quarterly filings. What remains visible is a $3.1 billion directional bet that the current AI infrastructure build-out has another 18 to 24 months of accelerating capex before utilization curves flatten. The fund's last comparable concentrated position — the 2012 Bank of America stake — returned 74% over the subsequent 16 months.
The takeaway
Tepper runs 40% in three AI infrastructure names; Micron earnings March 19 and TSMC's April call are now portfolio-level events.
Editorial & Disclosure Notice: This article was written with artificial intelligence from public sources and is published without individual human review. Artificial intelligence and other digital tools are also used for research, analysis, editing, formatting, and production. Errors, omissions, outdated information, or inaccuracies may occur. References to companies, brands, products, services, organizations, or individuals are for informational and editorial purposes and do not imply endorsement, sponsorship, affiliation, partnership, or approval unless expressly stated. All trademarks and other intellectual property remain the property of their respective owners. Opinions, analysis, estimates, and commentary are informational only and should not be construed as financial, investment, legal, tax, medical, procurement, or other professional advice. Information may be corrected, clarified, or updated after publication. Corrections or removal requests: jenny@pops4.com.
Want the 60-second program for your specific event?
Enter your event and email — we build it and send the branded proposal before lunch. No obligation.
The branded-identity layer Chiefs of Staff and heritage CMOs route through — your name imprinted on real authorized stock, your pick of 200+ brands and 70,000 products, shipped from one accountable house. Nine editorial desks publish the intelligence those operators read before they sign.
200+authorized brands
70,000products · virtual proof on each
9 deskspublishing daily
1997one house, since
70,000 SKUs · virtual proof in 60 seconds · no platform fee · blind-shipped · ASI #217876
Your next customer won't visit your website. Their AI will.
AI assistants have quietly taken over the first step of buying — they answer from catalogs they can read and shortlist whoever can actually ship. Two questions now decide whether you exist to that buyer: can a machine read your catalog, and can you fulfill the order. Most brands fail one or both and never find out why the orders went elsewhere. The winners of this shift aren't the loudest. They're the most readable. Build for the machine that's about to do the shopping.
Built by the craft floor — apparel, media, packaging, and secure print.
This trade runs on hands, not desks. Imprint manufacturing & Komori heritage press through approved vendors · Canon high-speed secure-media operations is a craft floor — genuine Six Sigma discipline applied to ink, thread, foil, and registration, where a hundredth of an inch is the difference between a brand that reads serious and one that reads cheap. POPS4 is built by exactly those operators: independent, boots-on-the-ground engineers who carry their own book, read a client in microseconds, and put their name on every run. Beyond our own Virginia Beach floor, we work with a vetted network of craft manufacturers across the US — each meeting the highest excellence in QC standards in the industry, each a specialist in its own discipline — so apparel, hard-goods imprinting, media manufacturing, packaging, and secure printing all go to the bench built for them, coordinated from one accountable hub. Short-run from twenty-five units, volume to five hundred thousand. Two hundred authorized national brands, seventy thousand SKUs with virtual proofing on every one. Art archived for instant reorders. Net-thirty corporate terms, NDA-standard white-label — your name on the work, or none at all.
Strategy, positioning, identity, creative, and messaging — wired into an AI system that publishes and distributes on its own. Nine editorial desks generate the authority, the production house ships the physical proof, and the attribution layer tells you which post sold which SKU. What you get is an operating layer — content, catalog, and order path under one roof — that keeps working whether or not you are in the room. Built for principals who would rather own the machine than rent the agency.
Named-account programs — one desk, quiet delivery, NDA-standard.
One point of contact who already knows the file, so nothing restarts from zero between engagements. The work ships blind, under NDA, with your name on it or none at all. Built for single-family offices, heritage-house CMOs, sports-ownership groups, and the agencies that white-label our production. The relationship is the product; the merch is the proof of it.
SFO · Chief of Staff desk. Principal household, properties, aircraft, yacht, calendar, philanthropy — one file.
Shop seventy thousand products. Virtual proof on every one. 24/7.
Drop your logo on any product and see the virtual proof before asking. Quote routes direct to the desk. MCP catalog for AI agents. Celeste for the fast conversation. Full self-service checkout in development.