Wacker dumps €171m of Siltronic at a discount while AI buyers bet on a wafer shortage

Sold into the night at a discount

Wacker Chemie, Siltronic's former parent, sold 2.2 million shares of the wafer maker overnight on 22 September↗ at €77.25 each: a 6.7% discount to the €82.75 Xetra close, about €171m gross, and a stake cut from 21.67% to just under 15% ¹². Bank of America and Deutsche Bank ran the book ². "The proceeds from this transaction further strengthen our financial position and create additional room to invest in future growth," chief executive Christian Hartel said ¹.

The price ladder keeps falling

This was tranche two in four months, and the cheaper one. In May, Wacker sold 2.1 million shares at €89.35 ³.

In June, Siltronic itself placed new shares at €91, raising €273m in a bookbuilding its CFO called multiple times oversubscribed↗, with European and US long-only funds and "meaningful support" from anchor HAL Trust ⁴. More than €630m of Siltronic paper has changed hands since May, and the anchor's block cleared lowest ¹³⁴.

HAL, at 15.1% before the June raise, is likely to take Wacker's crown as largest holder ². Global Capital's summary of the other side of the September trade↗: "investors hungry for AI exposure" ⁵. What they hold lost €63m in the second quarter after €67m in the first, guides 2026 sales below 2025, and has a chief executive, Michael Heckmeier, who calls 300mm spot prices "clearly below reinvest level" ⁴⁶.

The standoff the seller is pricing

UBS, which lifted its Siltronic target to €120, sees 12-inch wafer utilization rising from 84% this year to 99% in 2028, and to 103.7% in 2029 if nobody builds. It reckons price increases of 40% to 50% are the prerequisite for any new capacity ⁷. The maker's side of that standoff, which The Inference covered on 27 September ("Wafer prices are set to jump 40%. Sumco still won't build."), is a refusal to build at today's prices; Wacker's refusal to hold is its mirror.

Heckmeier keeps the same gate: prices above reinvest first, then factories ⁴. Wacker frames the sales as balance, its "long-term strategic interest in Siltronic" against "the need to strengthen its balance sheet and free up capital" ⁸. It is not waiting for either camp to win. The 90-day lock-up attached to this sale↗, negotiated with Rothschild advising, lapses in late December ⁸. The intention, stated in the deal's headline↗, is to reduce the stake further ⁹, and a holding taken from 31% in May to under 15% argues the record agrees ².

A rally that did not rescue the block

Siltronic closed at €77.00 on 29 September, up more than 7%, as chip stocks rode Anthropic's IPO prospectus↗ and its $518bn of cloud, computing and infrastructure commitments ²¹⁰. The close still sat below the block's clearing price.

Either wafer prices jump in 2027, or the funds that paid €77.25 hold a company that just lost €63m in a quarter. December, when Wacker can sell again, is the date that tells ⁸.