Listed trading for the two most popular leveraged oil plays will end Thursday, December 8, 2016. It will mark the largest closure of any ETF or ETN in U.S. history. Exchange-traded product closures are usually a run-of-the-mill operation where a sponsor closes a fund, delists it, liquidates the assets, and then returns money to shareholders, all within a few days. It’s happened without a hitch more than 600 times for U.S. investors in ETFs and ETNs from iShares, PowerShares, SPDRs, and others. However, this simple shareholder-friendly process seems to get turned on end when Credit Suisse (CS) is the product issuer.

Credit Suisse has taken the unusual step of delisting the VelocityShares 3x Long Crude Oil ETN (UWTI) and VelocityShares 3x Inverse Crude Oil ETN (DWTI) without liquidating them. Much of the initial media coverage of the Credit Suisse press release either missed or glossed over the biggest part of the story: Credit Suisse would not be automatically redeeming the ETNs and returning the money to shareholders. Sure, Credit Suisse will still honor owner-initiated redemptions, assuming you have 25,000 shares or exact multiples thereof. However, that mechanism is intended for Authorized Participants (“APs”) and market makers. I doubt that many retail owners hold shares in those exact quantities.

At the time of the announcement, UWTI held $1.57 billion (81,607,583 units at $19.22) in assets, and DWTI held $227 million (2,990,404 units at $75.83). This easily makes UWTI the largest announced closure ever, far surpassing the $600 million in assets held by PowerShares DB Crude Oil Double Long ETN (former ticker DXO) back in 2009, and the $508 million in the CS X-Links Cushing MLP Infrastructure ETN (former ticker MLPN) just two weeks ago.

The latest information on the VelocityShares website shows that $749 million still sits in UWTI and $220 million in DWTI (as of 12/6/16). With nearly $1 billion still residing in these two instruments, there is either going to be a massive rush for the exit on Thursday, or a large number of traders (dare I say investors?) are going to learn what it means to try to sell an unlisted, over-the-counter, closed-end, unsecured debt obligation. Credit Suisse also said they were suspending the creation of any new shares. Therefore, in addition to being delisted, these products (soon to be formerly known as UWTI and DWTI) will be broken products, subject to premiums and discounts along with a complete lack of liquidity.

If you haven’t disposed of your shares yet, then I would suggest you do so before the deadline. These are trading vehicles—not investments. You do not want to “trade” 300% leveraged commodity vehicles in the illiquid over-the-counter market. Professional arbitrageurs will be waiting to take advantage of you.

Many owners of UWTI and DWTI have asked me what other funds provide 300% exposure to crude-oil futures. The answer is “none.” However, there are alternatives. The ProShares Ultra Bloomberg Crude Oil ETF (UCO) and ProShares UltraShort Bloomberg Crude Oil ETF (SCO) pair provide 200% daily exposure. Granted, you will have to allocate 50% additional equity to get the same notional exposure, but the ProShares offerings are ETFs instead of ETNs, and 2x products have much less leverage-induced decay than 3x leveraged products.

However, if you really want the juice of having 3x, 4x, 5x, or more exposure to crude-oil futures, then I strongly suggest you open a futures account and trade oil contracts directly. Not only can you avoid the next Credit Suisse fiasco, you can control the exact amount of leverage you want, and you do not have to contend with the daily reset of that leverage. However, futures trading is not for the faint of heart, but then neither is 3x ETN trading, and you will have to roll your own contracts (or else take delivery).

Delisting without liquidation isn’t new. Credit Suisse delisted three ETNs in 2009 and didn’t redeem (liquidate) them until four years later. Deutsche Bank (DB) delisted five Merrill Lynch Elements ETNs on November 17, 2008. It’s been more than eight years, and owners of Elements Australian Dollar ETN (former ticker ADE), Elements British Pound ETN (former ticker EGB), Elements Canadian Dollar ETN (former ticker CUD), Elements Euro ETN (former ticker ERE), and Elements Swiss Franc ETN (former ticker SZE) still have not received their money back.

Two years ago, Janus Capital Group acquired VelocityShares, and with it, the VelocityShares brand and trademarks. Both Janus and VelocityShares have been surprisingly quiet on this whole issue. Surprising because they are allowing Credit Suisse to tarnish their brand. However, Credit Suisse is the issuer of the notes, which apparently puts them in the driver’s seat.

The unanswered question is “why” Credit Suisse is doing this, especially since UWTI and DWTI were obviously successful products. Presumably, it is an exercise in balance sheet management in an effort to keep the bank on the right side of European regulators and their stress tests. We saw it last year when UBS trashed its ETN lineup and issued duplicate Series B ETNs. We saw it when Deutsche Bank (DB) called eight ETNs for redemption three months ago. As mentioned earlier, Credit Suisse liquidated the $508 million in the CS X-Links Cushing MLP Infrastructure ETN in November, but apparently that did not go far enough, and so we now have the UWTI and DWTI debacle. Meanwhile, Credit Suisse says it decided to delist “with a view to better aligning its product suite with its broader strategic growth plans.”

Update 12/9/2016-1: The over-the-counter ticker symbols for these delisted ETNs are UWTIF and DWTIF.

Update 12/9/2016-2: VelocityShares has teamed up with Citigroup to launch new replacement ETNs, which begin trading today. Their ticker symbols are UWT and DWT.

Update 12/9/2016-3: Credit Suisse announced it is reducing the minimum redemption amount from 25,000 to 500 ETNs.

Update 12/10/2016: VelocityShares is reporting that as of 12/9/16, the delisted UWTI(F) still has $423 million in assets and DWTI(F) has $132 million.

Disclosure: Author has no positions in any of the securities mentioned and no positions in any of the companies or ETF sponsors mentioned. No income, revenue, or other compensation (either directly or indirectly) is received from, or on behalf of, any of the companies or ETF sponsors mentioned.