Korea's leverage curbs moved the chip bet into margin loans rather than out of it

Korea's financial authorities made single-stock leveraged ETFs and notes expensive to enter from the 31st of last month, and turnover in them collapsed: combined daily volume across 16 such products fell 93.2%, from 12.4485 trillion won ($9 billion) on the 30th of last month to 845.2 billion won ($610 million) on the 7th of this month ^[8]. That is roughly 11.6 trillion won of daily turnover gone from listed leveraged products ^[3], but the leverage behind the semiconductor trade did not go with it: margin lending on Samsung Electronics and SK hynix shares climbed over the same weeks ^[1].

The rule itself explains part of the substitution. Since the 31st, individuals buying or adding to single-stock leveraged products, at home or abroad, must hold a base deposit of 30 million won ($21,700) in cash, and securities such as stocks, ETFs and bonds are not accepted for it ^[6]. A margin loan asks the opposite of an investor: it accepts the shares as the thing that supports the position.

The numbers, from Koscom, are one-sided. Samsung's average daily new margin loans rose 52.3%, from 2,487,364 shares last month to 3,788,924 shares over the first 14 days of this month; SK hynix rose 25.5%, from 526,625 to 660,707 ^[2][3]. That is about 1.3 million extra Samsung shares and 134,000 extra SK hynix shares bought on borrowed money every day ^[5]. New margin trading also took a larger slice of total volume, rising from 9.12% to 12.74% for Samsung and from 10.06% to 12.28% for SK hynix, a gain of 3.6 and 2.2 percentage points ^[4][4]. Outstanding margin balances rose 8.2% for Samsung and 7.6% for SK hynix between the 31st of last month and the 14th of this month ^[5].

The clearest single day was the 4th, when trades from the effective date settled: Samsung recorded 8.1 million shares of new margin loans, the highest of the 20 trading days analysed, and SK hynix 978,000 ^[7]. That is about 2.1 times Samsung's monthly average and 1.5 times SK hynix's ^[1][2].

Seoul Economic Daily is careful about causation, noting that some of the demand leaving leveraged products may have gone into index-based leveraged products rather than margin loans, and that the appeal of Samsung and SK hynix prices after last month's sharp fall is also cited as a factor ^[9]. The fundamental case is doing work here too. Analysts read both names as pricing AI memory competitiveness rather than a simple earnings recovery, with higher general-purpose DRAM and NAND prices, expanded HBM4 mass production and better advanced DRAM yields behind hopes for Samsung's HBM share ^[12], and Son In-jun of Eugene Investment & Securities saying SK hynix is "entering a phase of greater visibility for earnings growth, based on HBM4 and LTAs" ^[13][14].

The consequence for operators is about where the stop-loss now lives. The published series gives a daily count of new loans and an outstanding balance ^[2][5]; it does not say at what price those buyers become sellers.

Watch the 19th, when new individual entrants to single-stock leveraged products must add at least five hours of simulated trading over a minimum of five trading days to the deposit and education requirements, and price-gap management on ETFs and notes is strengthened ^[10]. Seoul Economic Daily frames a further rise in margin trading after that date as a second test of whether leveraged demand is routing around the curbs ^[11].