Hanmi Semiconductor, the South Korean firm that dominates the market for the thermal-compression (TC) bonders used to stack high-bandwidth memory (HBM), told regulators on Friday it will buy ₩50 billion ($36.5 million) of SpaceX shares just ahead of the rocket maker's stock-market debut (The Korea Times, June 12, 2026). For a company whose machines sit at the choke point of the AI-memory supply chain, the more useful question than "why SpaceX" is: how big is this bet, and what is it actually a bet on?
The number is small for Hanmi — and tiny inside SpaceX
Start with the sizing, because it reframes the headline. Hanmi carries a market value of roughly ₩26.8 trillion ($19.6 billion) (companiesmarketcap), so a ₩50 billion outlay is under 0.2 percent of the company. Against 2025 sales of ₩576.7 billion ($421 million) — a record, at a 43.6 percent operating margin (Asia Business Daily) — it is about 8.7 percent of one year's revenue. This is a position Hanmi can write off without denting its balance sheet.
The filing described the outlay as equal to about 7.24 percent of equity. Measured against SpaceX, that figure is impossible: ₩50 billion is roughly 0.002 percent of the rocket maker's ≈$1.77 trillion IPO valuation (CNBC, June 3, 2026). The 7.24 percent therefore refers to Hanmi's own equity base — the threshold that triggers Korea's mandatory "acquisition of another company's shares" disclosure — not to any meaningful ownership of SpaceX. In SpaceX terms, Hanmi is buying a sliver.
So this is neither a control play nor a strategic supply agreement dressed up as equity. It is a minority financial position in what is shaping up to be the largest IPO ever: SpaceX has set a fixed $135 per share, plans to sell 555.6 million shares for a roughly $75 billion raise, and will list on the Nasdaq under the ticker SPCX, with Elon Musk retaining more than 82 percent voting control (CNBC, June 3, 2026). The Korea Herald reported the same ₩50 billion outlay and the impending Nasdaq listing (June 12, 2026).
What it is actually a bet on: Terafab
Hanmi's stated rationale points past SpaceX's launch business to silicon. The company cited the "growth potential of Elon Musk's Terafab and SpaceX" amid surging demand for advanced chips, aerospace and AI (The Korea Times). Terafab is the vertically integrated chip-manufacturing complex Musk is building across Tesla, SpaceX and his AI firm xAI; SpaceX has filed for a roughly $55 billion fab in rural Texas, with total chipmaking investment that could reach $119 billion (Tom's Hardware). Per Hanmi's filing, the facility is slated to begin operations in 2028, with about 80 percent of its output destined for SpaceX data centers and the rest going onto Tesla vehicles and Optimus robots.
That is the thread back to Hanmi's day job. Its TC bonders held a 71.2 percent global share by revenue through the third quarter of 2025 (Asia Business Daily), and demand is live now: SK hynix, Korea's second-largest chipmaker and the leading supplier of HBM, reportedly placed a ₩44.2 billion ($32.3 million) TC-bonder order with Hanmi this month to accelerate its HBM4 ramp (TrendForce, June 9, 2026). A captive, Musk-controlled advanced-packaging buildout is a potential future customer pool — and Hanmi framed the stake accordingly. "We will reinvest the expected future returns into our core semiconductor equipment business to seek sustainable growth, while enhancing shareholder value," a company official said (The Korea Times).
Precedent and the open question
Strategic chip-industry players buying into a marquee listing is not new. When Britain's Arm Holdings went public on the Nasdaq on Sept. 14, 2023 at $51 a share, its cornerstone backers included Samsung Electronics, Korea's largest company and a top memory-chip maker, alongside Apple, Nvidia and Intel — customers taking equity in a supplier; the stock jumped 24.7 percent on debut to a roughly $65 billion valuation. The logic Hanmi is invoking rhymes with that, only here the buyer is a tool vendor reaching toward a prospective tool customer.
The near-term mark is immediate: SpaceX's Nasdaq debut will price Hanmi's stake within days. The structural test is years out — whether Terafab actually breaks ground and starts in 2028, and whether its packaging lines become Hanmi orders rather than a paper gain on a hot IPO. Watch Hanmi's next quarterly disclosure for how the holding is carried, and SpaceX's post-listing capex guidance for any concrete Terafab timeline. Separately, Chairman Kwak Dong-shin is due to buy ₩8 billion ($5.8 million) more in treasury shares on June 16, lifting his stake to 33.60 percent and bringing his purchases since 2023 to ₩64.5 billion ($47 million) (Seoul Economic Daily, May 19, 2026) — a signal of insider conviction independent of the SpaceX trade.
Won figures are converted at about 1,370 won to the dollar except where a cited filing or report supplies its own rate. This article is for informational purposes only and is not investment advice.
