What Is KORU and Why a 3x Korea ETF Returned 1.55x in a Rising Market

KORU is the Direxion Daily MSCI South Korea Bull 3X ETF, and in the 67 sessions to 21 September 2026 it returned 1.55 times its index move, not three. The fund targets 300 percent of the MSCI Korea 25/50 Index for a single day, and it hit that target on almost every one of them.

The shortfall is 25.2 points. On our own files the 1x fund EWYUSDT returned 17.44 percent over those 67 sessions and KORUUSDT returned 27.11 percent. Three times 17.44 is 52.31. Daily compounding took the difference, and a 20-for-1 forward split on 15 July 2026 left a fake 95.80 percent bar in the price history.

What Is KORU and What Does the Fund Hold?

The KORU ETF trades on NYSE Arca and opened on 10 April 2013, with Rafferty Asset Management as its adviser. It charges 1.32 percent gross and net, and Rafferty has capped total annual operating expenses at 0.95 percent through 1 September 2027 under an operating expense limitation agreement. Both numbers describe the same fund, because the cap leaves out swap financing and swap financing is most of what this fund pays for.

The book is small and blunt. At 30 April 2026 the semi-annual report filed with the regulator showed ten holdings and total return swaps worth 248.7 percent of net assets. Shares of other investment companies made up the remaining 51.3 percent. Those two lines add to exactly 300.0 percent of net assets. Net assets stood at $1,551,590,072 on that date and portfolio turnover ran at 264 percent for the six months.

If you want Korea without the multiplier, the 1x Korea ETF on the same index is the reference point this article uses throughout. It tracks the net-return version of the MSCI Korea 25/50 Index while KORU tracks the price version, and that difference is far smaller than the one measured here.

Direxion put the fund's net asset value at $22.58 on 21 September 2026, up 12.91 percent on the day. Our own perp closed at 22.74 on the same date, 0.71 percent above it, so the mark behind every figure here is honest.

Why Does the KORU Price History Break in Two on 16 July 2026?

Because the share count changed. A Form 497 supplement filed on 10 June 2026 announced a 20-for-1 forward split of KORU. The record date fell on 13 July 2026, and the shares began trading on a split-adjusted basis on 15 July. Direxion paid the split after the close on 14 July. Every share became twenty, and the net asset value per share became roughly one twentieth of what it had been.

Our file holds 91 daily bars for the KORU perpetual futures contract, running from 23 June to 21 September 2026. The bar dated 16 July opens at 430.32 and highs at 430.58 on the old share basis, then lows at 18.08 and closes at 18.28 on the new one. Read as a single bar that is a 95.80 percent range, and nobody traded it. The numerator and the denominator are different shares.

The contract's current listing opened at 11:00 UTC on 16 July 2026, which puts the changeover inside that same bar. So the 24 bars dated 23 June to 16 July price a share that no longer exists, and the 67 bars from 17 July to 21 September price the one that does. Every figure below comes from those 67.

Why Did the 3x Korea ETF Return 1.55x While the 1x Returned 17.44 Percent?

Measured close to close from 17 July 2026 to 21 September 2026, EWYUSDT gained 17.44 percent and KORUUSDT gained 27.11 percent. Three times the 1x move is 52.31 percent, so the 3x Korea ETF delivered 1.55 times the index and gave up 25.2 points of it. That window covers 67 daily bars and 66 paired daily moves, weekend bars included, because a perpetual contract prices through Saturday and Sunday while the underlying fund does not trade at all.

The daily job was done. Across those 66 paired moves the median ratio of KORU's close-to-close move to EWY's was 2.98, about as close to the mandate as a swap book gets after fees. A trader who checked the tracking every evening wouldn't have found anything wrong on any single evening.

Korea itself supplied the volatility. The index behind both funds ran through a crash and an AI-driven rally in 2026, and violent round trips are what daily resetting punishes hardest. KORU's median absolute daily move over the 67 sessions was 4.47 percent against EWY's 1.57 percent.

One caution on the anchor bar. KORUUSDT closed at 22.74 on Monday 21 September 2026, up 11.58 percent on the Sunday close of 20.38, but up 14.33 percent on the Friday 18 September close of 19.89. The Sunday denominator is a thin weekend mark on a fund whose underlying market was shut. It is the same trap that shows up across TradFi perpetuals that keep moving while Wall Street is closed. EWYUSDT closed at 189.80 on the same bar, 4.87 percent above its Friday close.

How Does Daily Compounding Turn a 3x Korea ETF Into 1.55x?

Take the two sessions of 29 and 30 July 2026, which hold the biggest one-day gain in the window.

On 29 July EWY fell 5.91 percent and KORU fell 18.52 percent, a ratio of 3.13. On 30 July EWY rose 11.81 percent and KORU rose 37.26 percent, a ratio of 3.16. The fund beat its daily target on both days. Over the pair EWY gained 5.20 percent and three times that is 15.59 percent, while KORU gained 11.84 percent. Two days of over-delivery produced a two-day result 3.75 points behind the multiple.

The arithmetic is dull and it carries the whole story. After a fall of 18.52 percent you no longer own three times a dollar of index. You own three times 81 cents, and the fund rebalances to that smaller base before the next session opens. Recovery days work on less capital than the fall days destroyed. That is leveraged ETF decay, and it has nothing to do with fees or tracking error.

Direxion prints the warning on the fund page itself. The fund, it says, should not be expected to provide three times the return of the benchmark's cumulative return for periods greater than a day. Its performance table makes the same point over thirteen years. As of 31 August 2026 the net asset value had compounded at 1.54 percent a year since inception on 10 April 2013. The trailing three months on that same date read minus 61.63 percent, against a year-to-date figure of plus 131.00 percent.

Those two figures carry different instants and the page prints both. The $22.58 net asset value is dated 21 September 2026. The performance table beside it is dated 31 August 2026, three weeks earlier, and quoting one as if it were the other would be an error.

What Does 10x on a 3x Fund Cost You?

The KORU contract allows a maximum of ten times leverage, and its first risk tier carries a maintenance margin rate of 0.05. A 10x isolated long therefore liquidates on a 5.00 percent adverse move in the mark. Stacked on a fund that already triples its index, ten times leverage is thirty times Korea, so the level that ends the position is a 1.67 percent move in the index.

That level isn't a tail event on this chart. Of the 67 clean sessions, 53 travelled 5.00 percent or more away from the session open in one direction or the other. That works out at 79.1 percent. The 1x fund cleared its equivalent 1.67 percent threshold in the very same 53 sessions, which is what you would expect when one instrument is a deterministic multiple of the other. The largest close-to-close move in those 67 sessions was a 37.26 percent gain on 30 July 2026, the session straight after an 18.52 percent fall.

Funding settles every eight hours at 00:00, 08:00 and 16:00 UTC, so a position held through a violent week pays or receives three times a day on top of the mark. If you've never watched how a liquidation engine works, read that before you size anything on an instrument with a 4.47 percent median daily move.

What Are the Specific Risks Inside the KORU Index?

Concentration is the first one and it is extreme. Direxion's index data, dated 30 June 2026, put SK Hynix at 27.41 percent of the MSCI Korea 25/50 Index and Samsung Electronics at 23.38 percent. Two companies carry 50.79 percent of an index this fund triples, and information technology carries 56.65 percent of it. The semi-annual report two months earlier had the same pair at 22.8 and 22.5 percent, so the weight of the top two moved more than five points in a single quarter. A memory-price cycle is the position, and what drives SK Hynix through the AI memory trade drives most of this fund.

The second risk is the share basis. Direxion has restruck KORU twice inside twenty months, announcing a reverse split on 10 January 2025 and the 20-for-1 forward split on 10 June 2026. Each one breaks any price series that was never adjusted for it, including the part of our own file dated before 17 July 2026.

The third is the record. A fund that compounds at 1.54 percent a year across thirteen years while its index rises is not broken. It is a one-day instrument, priced and rebalanced for one day, and the 67 sessions above price what the second day costs.

Frequently Asked Questions

Does Phemex list a KORU perpetual?

Yes. The contract went live at 11:00 UTC on 16 July 2026 with a maximum of ten times leverage. Turnover on the 21 September 2026 bar was $2,411,942.

What does holding KORU actually cost?

The headline number is 1.32 percent gross and net. The semi-annual report puts it in dollars, showing $96 of costs on a hypothetical $10,000 investment for the six months to 30 April 2026, or 0.90 percent annualised.

Is EWY a fair 1x comparison?

It tracks the net-return version of the same MSCI Korea 25/50 Index and held $27,365,088,480 in net assets on 21 September 2026. The fund's own closing price that day was $189.16 against our perp's 189.80, a gap of 0.34 percent.

How has KORU done over five and ten years?

As of 31 August 2026 its net asset value returned 5.39 percent a year over five years and 5.16 percent a year over ten. The trailing twelve months on that same date read plus 436.34 percent.

Bottom Line

A daily-target fund keeps a promise one session at a time and makes no promise at all about the sum of them. KORU kept its side of that bargain through a rising quarter and still handed back 1.55 dollars of index move for every three it was priced to deliver. If you trade it, trade the session. If you hold it, you're paying thirty times Korea for a bet you probably meant to size at three.

Disclaimer: This article is for informational purposes only and is not financial advice. Cryptocurrency trading involves substantial risk. Always do your own research before making investment decisions.