Justem's half-year profit triples last year's full year: capex has reached the invoice stage

South Korean suppliers of semiconductor materials, parts and equipment reported first-half earnings above market expectations, which the Seoul Economic Daily attributes to a jump in large-scale investment by major memory chipmakers as AI demand spreads ^[1]. The number that matters is at the small end of the chain: equipment maker Justem booked 46 billion won (about $33 million) of standalone revenue and 13.4 billion won of operating profit in six months, against full-year figures last year of 47.1 billion won and 4.9 billion won ^[2][3].

That is 2.7 times last year's entire annual operating profit, delivered in half the time, on revenue that already equals 97.7 percent of the prior full year ^[4][5]. Memory capex announcements have been plentiful for a year. Revenue at a components supplier is a different signal: tools and consumables get invoiced when they ship, not when a fab plan is presented.

The quarterly shape is more telling than the half-year total. Justem's second quarter brought 28.7 billion won of revenue and 9.3 billion won of operating profit, up 157 percent and 323 percent year on year, against forecasts of 26 billion won and 6.5 billion won ^[6][7]. The revenue beat was 10.4 percent; the profit beat was 43 percent ^[8]. Operating margin ran at 32.4 percent in the second quarter and 29.1 percent for the half, against 10.4 percent for all of last year ^[9]. Backing out the first quarter gives roughly 17.3 billion won of revenue at a 23.7 percent margin, so the margin expanded through the period rather than arriving in one lump ^[10]. Justem credits expanded supply of JFS, a second-generation humidity-control product, on top of continued demand for the first-generation N2LPM, and a company official said JFS is being supplied rapidly on expanded investment in advanced processes by integrated device manufacturers ^[11].

The other two names show the same demand and two different balance sheets. Samyang NC Chem, which makes photoresist for lithography, posted 78.7 billion won of revenue and 12.1 billion won of operating profit, up 28.4 percent and 38 percent ^[12][13]. Profit outgrew revenue on a richer mix of high-value products serving AI servers and data centres, for a 15.4 percent operating margin ^[14][16]. A company official said the firm would keep raising the share of high-value-added products ^[15].

KNJ, which supplies CVD silicon carbide focus rings used in etching, grew consolidated revenue 80.2 percent to 69.1 billion won but operating profit only 27.7 percent to 14 billion won ^[17][18]. That is margin compression from about 28.6 percent to 20.3 percent ^[21]. Net profit fell 17.3 percent to 6.7 billion won because KNJ pulled forward a new plant and infrastructure build to serve demand that exceeded its capacity, front-loading the cost ^[19]. A company official said profitability should improve in the second half as the added capacity converts into supply and revenue ^[20].

Two things to watch. First, whether KNJ's second half validates that claim, because a supplier forced to build ahead of orders is the tell that this is volume, not price. Second, whether Justem holds a 30 percent margin once JFS is no longer scarce; a 43 percent profit beat means the sell side has not yet found the ceiling ^[8][9].