TSMC's board spent part of Tuesday deciding how much of the AI boom it wants to own, as well as supply. The answer, in the resolutions the company filed with the SEC on November 10, is two ceilings of $500 million: one for Anthropic shares at the IPO price, one for OpenAI preferred stock. Headlines have rounded that to a $1 billion investment. The filings support a narrower statement. TSMC has approved spending up to those amounts, on terms that are in one case unset and in the other undisclosed, and the filings do not establish that either purchase has been completed.

Two caps, two different states of knowledge

The Anthropic leg is priced by reference. Resolution 5 authorizes purchases at the eventual IPO price, subject to a $500 million cap. Anthropic's amended prospectus, filed the same morning, estimates that price at $70 to $78 a share, so if the full cap were spent at those prices it would translate to roughly 6.4 million to 7.1 million shares. But the filing gives an estimated range, not the final IPO price, and a future price would establish the cap's share equivalent, not necessarily the amount actually spent.

The OpenAI leg's price is not disclosed. The same resolution caps the purchase of OpenAI Group PBC preferred stock at $500 million and stops there. TSMC discloses no purchase price, valuation, financing round or completion date for the OpenAI preferred stock. Of the two authorizations, one is a ceiling waiting for a price and the other is a ceiling waiting for everything.

The $500 million that appears twice

There is a second $500 million in Tuesday's paperwork, and it is the detail most coverage steps over. Anthropic's filing confirms the $26 billion concurrent placement. Seven partners will buy non-voting Class N common stock at the IPO price. TSMC Partners, Ltd. is one of the seven, listed at about $500 million at the $74 midpoint, or 6,756,756 shares; Anthropic's prospectus itself shortens the affiliate's name to "TSMC" in the placement table.

Set that beside the board resolution. The 6-K authorizes acquiring Anthropic's "common shares" without naming the executing entity. The prospectus names an affiliate acquiring Class N common stock, which is itself a class of common stock. The dollar figures match to the point where the midpoint share count is almost exactly what $500 million buys. Neither filing expressly states whether these entries describe the same authorization and purchase. A single-commitment reading is plausible, but the relationship is not established, and the existence of two entries does not itself establish an additional $500 million commitment. Anyone adding the two figures into a larger TSMC total, or folding the placement line silently into the board cap, is doing arithmetic the filings have not yet authorized in words.

What the corrected filing changed, briefly

Anthropic's November 10 amendment gives an estimated $70–$78 range, cuts the share count against the terms circulated to bankers on November 9 and then called inaccurate, identifies the secondary sellers as the seven co-founders, and confirms the placement the earlier reporting could not. ALFW's earlier report on the retracted pricing has been updated with the filed offering details; the new reporting here is the board's decision and the overlap it leaves open.

Scale of the authorizations

Context helps keep the decision in proportion. The same board meeting approved capital appropriations of approximately $40.93 billion, per the 6-K. Against that, the two $500 million caps together equal about 2.4 percent of the appropriations figure, a size comparison between two stated numbers, not evidence of how any money will be allocated. The strategic reading is straightforward: the foundry that manufactures the industry's accelerators has authorized modest, capped equity positions in the two model developers, one of which is about to list. It has not, in these documents, completed them.

What to watch is paperwork, not speeches. The IPO price, when set, fixes what the Anthropic cap buys. The placement's closing conditions decide whether the Class N line completes. And a future disclosure from either filer that names the acquiring entity and share class in one sentence would settle the overlap question that Tuesday's two filings, read together, leave open.

Sources

  1. [1] TSMC, Form 6-K (board resolutions), filed with the SEC November 10, 2026, accession 0001046179-26-000797 — read first-hand on EDGAR; Resolution 5 quoted verbatimRead source
  2. [2] Anthropic, PBC, Form S-1/A Amendment No. 2, filed with the SEC November 10, 2026, accession 0001628280-26-072484 — read first-hand on EDGAR (offering terms, concurrent private placement section, shares outstanding, use of proceeds)Read source
  3. [3] RR Tech Pulse, "TSMC board approves up to $500M each in Anthropic and OpenAI" (November 10, 2026)Read source
  4. [4] EL7.AI, "TSMC approves investments of up to $1 billion in Anthropic and OpenAI" (November 10, 2026)Read source
  5. [5] TipRanks, "TSMC Stock (TSM) Rallies 2% on Plans to Invest $1B Into Anthropic and OpenAI Shares" (November 10, 2026)Read source
  6. [6] Prior ALFW coverage, updated with the filed terms: "Anthropic Retracts the IPO Pricing Details It Sent Bankers, Reuters Reports" (November 10, 2026)Read source