港股窩輪Jenny

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Observing US equity warrants: After sharp single-day moves, product terms matter more than directional calls

US individual stock movements on July 31 were extremely volatile. Amazon surged 15.3% in a single day, Google rose 6.7%, and Microsoft gained 3%. On the other hand, Apple dropped 7.35%, Micron fell 5.9%, and Netflix and AMD each declined by about 2%.

In such market conditions, investors are easily tempted to chase call warrants after seeing sharp rallies or put warrants after sharp declines. However, currently listed US equity-linked products in Hong Kong are quite limited—most stocks have only one call or one put warrant available, and some strike prices are far from the current spot price.

Therefore, instead of listing each stock individually, this article focuses on analyzing a few representative cases with the most illustrative product terms.

Common limitations of individual stock products

Almost all US equity-linked products listed in the annex are equity warrants; there are currently no corresponding bull/bear certificates for these stocks. Many stocks have only one call and one put warrant available, meaning investors cannot freely choose among multiple strike prices, maturities, and leverage levels as they can with index-linked products.

This also shifts the core issue for individual stock warrants to:

1. Whether the existing products truly track the underlying stock effectively;

2. Whether the strike prices are too far from the current market price;

3. Has implied volatility already reflected most of the expected volatility?

4. Will the bid-ask spread erode short-term profits?

Amazon $Amazon (AMZN.US)$ : The underlying stock has broken out, and the call warrant terms are also the closest to usable.

Amazon surged 15.3% in a single day, closing at $271.58—breaking decisively above the upper Bollinger Band. RSI has risen to approximately 70–81, indicating the stock is already in overbought territory in the short term. Immediate resistance lies at the previous high of $278–$280, while support is seen at the gap zone of $262–$265.

The existing call warrant has a strike price of $245, placing it about 6% in-the-money, with an effective leverage of 7.2x, a delta close to 70%, a premium of approximately 3.7%, and daily time decay of around 0.8%.

Among current single-stock products, these terms are relatively well-balanced: the strike price is already in-the-money, delta is high, and the product can closely follow further upside moves in the underlying stock. Even if Amazon shifts from a sharp rally into consolidation at elevated levels, this warrant won’t lose sensitivity as quickly as deeply out-of-the-money products would.

Note that this product expires in September, so time to maturity isn’t long, especially after the stock’s recent sharp rally. The appropriate strategy isn’t to chase the warrant indiscriminately right at market open, but rather to wait for the underlying stock to retest the $262–$265 support zone and hold firm before considering using the call warrant to capture a potential second leg upward.

Conversely, Amazon put warrants have a strike price of only $180—about 31% out-of-the-money—with a delta of just 7%, a premium of 32%, and implied volatility of 45.7%. Even if the underlying stock pulls back more than $10 from its high, these put warrants may not react sufficiently.

Amazon's existing warrants clearly favor call options; put warrant terms are too far out-of-the-money and should not be bought against the trend solely due to the underlying stock being overbought.

Microsoft $Microsoft (MSFT.US)$ : Call warrants are near-the-money, but after a large gap up, the biggest risk is a drop in implied volatility.

Microsoft closed at USD 464.72, up 3% in a single day. However, the most important aspect on the chart isn't the 3% gain, but rather the price gapping directly from around USD 390 to above USD 450. The RSI has risen to approximately 77–88, indicating clear short-term overbought conditions.

The existing call warrant has a strike price of USD 450, slightly in-the-money, with a delta of 52.5%, effective gearing of 8.3x, a premium of 6.8%, and implied volatility of around 38%. The terms themselves aren't bad—at least it's not deeply out-of-the-money.

The issue is that after a large upward gap in the underlying stock, implied volatility is typically already elevated. If Microsoft trades sideways between USD 450 and USD 465 the next day—even without a significant decline—the call warrant may still underperform due to declining volatility and time decay.

Therefore, investors bullish on Microsoft should treat USD 450 as a key level. If the price holds above USD 450, the call warrant can still be used to bet on a move toward USD 480. However, if it falls below USD 450, the warrant’s high delta will cause it to lose value relatively quickly.

The put warrant has a strike price of USD 390, about 13% out-of-the-money, with a delta of 17% and daily time decay of nearly 2.8%. Unless Microsoft rapidly fills the gap, this put warrant isn't suitable for patiently waiting for a trend reversal.

Apple $Apple (AAPL.US)$ : After a sharp drop, call warrants offer better trading value than put warrants.

Apple fell 7.35% in a single day, closing at USD 308.91, with an intraday low of USD 300. The short-term RSI dropped to around 26, and the stock price neared the lower Bollinger Band at USD 304.7, placing it technically in an oversold rebound zone.

The existing call warrant has a strike price of USD 300, about 3.6% in-the-money, with a delta of 62.9%, effective gearing of 7.9x, a premium of 4.4%, and daily time decay of only about 0.8%. For investors betting on Apple holding above USD 300 and rebounding, this product’s terms are actually quite suitable.

Its advantage lies not in exceptionally high leverage, but in having a strike price close to the current stock price and sufficient delta; theoretically, it can more fully reflect the upside move as the stock rebounds from $300 to $320.

Conversely, the existing put warrant has a strike price of $248—more than 20% out-of-the-money—with a delta of only 7.3%, daily time decay as high as 4.45%, and a relatively wide bid-ask spread. Even if Apple drops another $10, this put warrant may only react modestly.

Thus, Apple currently presents a classic scenario: the underlying stock has just plunged sharply, but the put warrants offered by the market are unsuitable for chasing further downside; instead, in-the-money call warrants are better suited to capture an oversold bounce.

If the $300 level breaks down, bounce-oriented positioning should cease; however, as long as it holds, the terms of the existing call warrants are clearly superior to those of the put warrants.

NVIDIA $NVIDIA (NVDA.US)$ The underlying stock is near the midline, but neither the call nor put warrants are particularly cheap

NVIDIA closed at $200.75, moving back toward the Bollinger Band midline at $203.30, with RSI around 48–51, indicating a temporarily neutral trend. Resistance lies between $203 and $210, while support is seen between $190 and $195.

The existing call warrant has a strike price of $275—nearly 39% out-of-the-money—with a premium of 41.5%, a delta of only 18.8%, effective leverage of 6.9x, and implied volatility of approximately 46%.

The main contradiction in these terms is that while leverage isn’t particularly high, both the strike price and premium are extremely aggressive. Even if NVIDIA breaks above $210, the warrant would still be far from its strike price and might not deliver the explosive performance investors expect.

On the put side, the closest warrant has a strike price of $168—about 15% out-of-the-money—with a delta of 23%, effective leverage of 4.5x, a premium of 20%, and implied volatility of 51%. It’s more reasonable than the $130-strike put, but overall costs remain relatively high.

NVIDIA is currently better suited for waiting until direction is confirmed. Only after a breakout above $210 would the existing call warrants offer a clearer trading rationale; similarly, the $168 put warrant would only start gaining sensitivity after a breakdown below $190. With the stock trading sideways around $200, both sides will suffer from time decay and declining volatility.

Tesla$Tesla (TSLA.US)$ The put warrant terms are reasonable, whereas the call warrant is almost a pure speculative bet

Tesla rebounded from a low of $297.38 to $311.21. The RSI remains only around 29 to 37, indicating a short-term oversold bounce, but the stock price is still far below the Bollinger Bands midline at $364, and the overall downtrend remains intact.

There are currently two put warrants with strike prices of $330 and $340, respectively, already in-the-money, with deltas around 46% to 50%, effective leverage of about 3x, premiums of approximately 9% to 11%, and daily time decay of only about 0.3%.

These put warrants don’t offer high leverage, but their terms are relatively stable. If Tesla rebounds to $320–$330 and then weakens again, these warrants can closely track the underlying stock’s decline without requiring a steep drop in the stock price to start reacting.

Call warrants are the exact opposite: with a strike price of $490, they are over 55% out-of-the-money, have a delta of only 6%, a premium of 55.8%, and daily time decay as high as 5.3%. Even if Tesla rebounds from $311 to $340, these products may still underperform.

These are not typical instruments for capturing rebounds, but rather bets on Tesla achieving an extreme short-term surge. For most short-term investors, the current call warrant terms are unsuitable.

How to choose single-stock derivative products?

What matters most this time isn’t which underlying stock rises the most, but which product truly reflects the direction of its underlying stock.

Products with more practical tactical value include:

– In-the-money Amazon call warrants: high delta, suitable for buying on pullbacks in anticipation of a breakout;

– In-the-money Apple call warrants: suitable for capturing oversold rebounds with a defensive level set at $300;

– At-the-money Microsoft call warrants: suitable for short-term trades, but beware of implied volatility contraction following a gap move;

– In-the-money Tesla put warrants: leverage is modest, but terms are relatively stable;

– For NVIDIA, it’s better to wait until a breakout above $210 or $190 before deciding on direction.

Conversely, Tesla calls, NVIDIA calls, Amazon puts, and Apple puts all suffer from issues such as strike prices too far out-of-the-money, low delta, or rapid time-value decay.

When there are few warrant choices available for individual stocks, the absence of suitable products itself is an important conclusion. Even if your market view is correct, unfavorable warrant terms can still lead to losses.

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