Toxic Convertibles Explained, From Variable Conversion Prices to No Floor

The short version

"Toxic convertible" is market slang, not a legal term. It describes a convertible note or convertible preferred stock whose conversion price moves with the market instead of being fixed when the deal is signed. Traders lump these structures under the label toxic financing, which refers to the deal terms, not to any particular investor or firm.

An ordinary convertible note might say: the holder can convert $1,000,000 of principal into common stock at $5.00 per share. That number of shares (200,000) is known on day one. A variable-price convertible instead says something like: the holder can convert at 80% of the lowest trading price over the last 10 trading days. The number of shares depends on where the stock trades at the moment of conversion, so nobody can state the final share count in advance.

When that formula has no minimum price, the note is a floorless convertible. That combination, a moving price with no bottom, is the core of the structure.

The four moving parts

Almost every variable-price conversion clause is built from the same four pieces. Learning to find each one in the agreement is most of the work.

1. The reference price. Usually a volume-weighted average price (VWAP), a closing price, or the lowest intraday trade. "Lowest" anything favors the holder.
2. The lookback window. How many trading days the reference price is measured over. A lookback period of 10 or 20 trading days, combined with "lowest", lets the holder pick the cheapest day in that window.
3. The discount. The VWAP discount is the percentage knocked off the reference price, often written as a percentage of it ("80% of" means a 20% discount).
4. The floor, or its absence. A floor price is a minimum conversion price. If the formula would produce a lower number, the floor applies instead. No floor means the conversion price can keep falling as long as the stock does.

This is what variable-price conversion means in practice: the price is an output of a formula, re-run every time the holder sends a conversion notice.

A worked example

Hypothetical Company X issues a $2,000,000 convertible note. The conversion price is 75% of the lowest daily VWAP in the 10 trading days before each conversion. There is no floor. Company X has 20,000,000 shares outstanding.

The holder converts $250,000 of principal each time, at different points as the stock price changes:

All figures hypothetical and rounded.

After five conversions the holder has turned $1,250,000 of principal into about 3,472,222 shares, roughly 17% of the original share count, with $750,000 of principal still outstanding. Notice that the last $250,000 produced four times as many shares as the first. The same dollar amount of debt becomes more shares as the price falls.

Why the discount matters even if the price never moves

The discount is not only relevant when the stock declines. Because the holder receives shares worth more than the debt converted (at market prices), there is a built-in spread. If the stock sits at exactly $1.00 for a month and the conversion price is $0.75, each converted share has a market value $0.25 above what it cost the holder in principal.

A holder who sells shares soon after converting captures that spread. Selling in volume can itself weigh on the trading price, which then feeds back into the next lookback window. That feedback loop is why the pattern is often described, in the vernacular, as a death spiral. It is a description of a possible mechanical loop, not a forecast for any given company: plenty of variable-price notes are repaid in cash or converted only partially.

How the terms read in a real filing

Variable conversion terms often sit in the description of notes in an annual or quarterly report, or in default provisions. An amended annual report filed on Form 20-F/A on 2026-10-06 (accession 0001493152-26-045996) described note terms under which, after an event of default, the holder could convert:

at a conversion price equal to 80% of the average of the four lowest volume weighted average prices over the preceding 20 trading days, with full-ratchet anti-dilution protection

Reading it piece by piece: the reference price is VWAP, the lookback is 20 trading days, "average of the four lowest" softens a pure "lowest" formula slightly, the discount is 20%, and no floor is mentioned in that sentence. It also adds full-ratchet protection, a separate mechanism covered in the resets guide. The trigger is a default, which is a reminder that a note can look fixed-price on day one and become variable later.

Where to find these terms

• 8-K, Item 1.01 and Item 3.02. The announcement of the financing, with a summary of terms. The full securities purchase agreement and the note are usually attached as exhibits numbered 10.x or 4.x.
• 10-Q and 10-K notes. The 10-Q debt footnote describes each outstanding note, its principal, conversion terms and any amendments since issuance.
• Prospectus or resale registration. If shares issuable on conversion are being registered for resale, the registration statement describes the note again, often with a table of shares issuable at different prices.

Key phrases to search for: "lesser of", "lowest", "VWAP", "trading days immediately preceding", "Conversion Price", "Floor Price", "Variable Price", "default conversion".

Fixed versus variable at a glance

The last row describes the economic incentive each structure creates, not what any specific holder does.

How to check a company on Signal8

• Open a company's Dilution tab, for example the Dilution tab view, to see convertibles extracted from filings. Where the terms support it, a convertible can carry structural chips such as No conversion floor, Ownership blocker, Balance not disclosed, Partitioned note and No maturity. These describe disclosed terms; they are not a rating. Dilution analysis focuses on small caps, so coverage varies.
• The dilution screener compares companies on dilution-related data.
• Watch new financings arrive on the live SEC filings feed, where 8-K Item 1.01 and 3.02 filings appear as they are filed.

FAQ

What makes a convertible note "toxic"?

The word is market vernacular for a structure, not a legal category. It usually refers to a conversion price that resets to a discount to recent trading prices, measured over a lookback window, with no minimum price. Because the share count rises as the price falls, existing holders can be diluted by an amount nobody can state in advance. The label describes the terms; it says nothing about the intentions of the investor who holds the note.

How many shares can a floorless convertible create?

There is no contractual maximum from the conversion formula alone. The practical limits are the remaining principal, the company's authorized shares, exchange rules that cap issuance above 20% without shareholder approval, and any ownership blocker in the note. To estimate exposure, divide the outstanding principal by a range of hypothetical conversion prices.

Is a variable-price convertible always bad for shareholders?

Not necessarily. It can be the only financing available to a small company, and some notes are repaid in cash before much conversion happens. What it does mean is that the eventual dilution depends on the stock price, so the outcome cannot be known from the filing alone. Reading the full terms, including floors, caps and prepayment rights, is the only way to understand the range.

Where is the conversion formula usually written?

In the note itself (often filed as Exhibit 4.1 or 10.1 to an 8-K) under a section titled "Conversion" or "Conversion Price", with defined terms like "VWAP" and "Trading Day" in the definitions section. Quarterly and annual reports summarise the same terms in the debt footnote.