A purchase unit is a bundled security sold in an initial public offering that packages one share of common stock together with a fractional warrant, and sometimes a right, under a single price. In a SPAC offering that price is almost always $10.00 per unit. The warrant portion gives you the option to buy additional stock later at a set price, which is what makes the unit worth more than a plain share. Units trade as one security after the IPO, and after a waiting period you can split them into their parts and trade each piece on its own.
What’s Inside a Unit
A standard SPAC unit contains one share of Class A common stock and a fraction of a redeemable warrant. One-half or one-third of a warrant per unit is common.1FINRA. SPAC Warrants: 5 Tips to Avoid Missed Opportunities If your unit carries one-third of a warrant, you need three units to hold one whole warrant you can actually exercise. Fractions cannot be traded or exercised on their own.
The warrant gives you the right to buy one additional share of common stock at a predetermined exercise price, almost always $11.50, at a future date.1FINRA. SPAC Warrants: 5 Tips to Avoid Missed Opportunities Some units also include a right, which converts automatically into a fraction of a share (often one-tenth) when a business combination closes. Rights require no exercise price from the holder and are simpler than warrants, but they show up in fewer deals.
Each unit trades under a single CUSIP number until it is separated. After separation, each component gets its own CUSIP and its own ticker.
Why Companies Sell Units Instead of Plain Shares
The bundle exists because a SPAC, by definition, has no operating business at the time of its IPO. Asking investors to pay $10.00 for a share of a company that owns nothing but a trust account full of cash is a hard sell on its own. Attaching a fractional warrant changes the offer: you get immediate equity plus a call option on the future stock price, all for the same $10.00.
The warrant is the hook for institutional investors. If the SPAC finds a strong merger target and the stock rises above $11.50 after the deal closes, the warrants become valuable. The issuer draws in capital without discounting the share price below $10.00. Operating companies occasionally use the same structure in their IPOs when they lack the track record to command a strong standalone share price.
How Units Trade and How You Split Them
After the IPO, units stay bundled for a mandatory waiting period. Nasdaq requires units to remain listed for at least 30 days before separation is allowed.2Nasdaq. SPAC Listing Guide Many SPAC prospectuses set the date at 52 days after the registration becomes effective, though the exact timeline depends on the underwriting agreement. Check the prospectus for the specific date.
Units do not split automatically. You have to contact your broker and request the separation. The broker coordinates with the transfer agent, and within a few business days the individual components show up in your account as separate line items with their own tickers. The issuer is required to disclose on its website when separation becomes available.2Nasdaq. SPAC Listing Guide If you never request the split, your securities stay locked in unit form. You can still sell the whole unit, but you lose the ability to trade the stock and warrant independently.
Most brokers charge a flat fee to process the separation, sometimes labeled a voluntary corporate action fee. Fees vary widely. Some brokers do it for free; others charge anywhere from $30 to $300. On a small position that fee can eat meaningfully into your holding, so ask before you buy.
Once the separation window opens, the original unit and its components trade side by side on the exchange. Units usually carry a “U” suffix on the ticker (ABCD.U or ABCD/U), warrants a “W” or “WS” suffix (ABCD.WS or ABCD/W), and the common stock trades under the base ticker. Conventions differ between exchanges and data platforms, so confirm the symbols with your broker.
Simultaneous trading creates pricing gaps. If the unit trades at $10.20 but the common stock is at $10.05 and the warrant at $0.50, buying the unit and separating it yields components worth $10.55 combined. Those spreads tend to close quickly as traders exploit them. For a retail investor, the practical takeaway is that checking the prices of both the unit and its components before you place an order tells you which route is cheaper. The unit ticker eventually stops trading once enough investors have separated their holdings and the remaining float becomes too thin for meaningful liquidity.
The Trust Account and Your Redemption Right
Roughly $10.00 per share of what you paid for a SPAC unit goes into a trust account that sits untouched until the SPAC either completes a merger or liquidates. That trust functions as a floor under the share portion of your investment.
When the SPAC announces a proposed business combination, public shareholders can redeem their shares for a pro rata portion of the trust instead of rolling into the merged company. The redemption price equals the trust balance plus interest earned, minus taxes and permitted withdrawals, divided by the total number of public shares outstanding. If you don’t like the target, you take your money back.
The redemption right applies only to the common stock portion of your unit, not the warrant. You can redeem your shares and still keep your warrants. If the post-merger company performs well, those warrants may still pay off even though you pulled your cash out.
What Happens if No Merger Closes
SPACs typically have 18 to 24 months to find a target and close a deal. If the deadline passes without a completed business combination, the SPAC liquidates and returns the trust funds to public shareholders. You get back approximately what you put in, plus interest, minus taxes and expenses.
Warrants are a different story. Public warrants are exercisable only if the SPAC completes a business combination. If the SPAC liquidates, the warrants become worthless. Whatever you paid for warrants on the open market, or the implied value of the fractional warrants inside your units, is at risk. The same applies to any rights included in the unit.
Warrant Risks After a Merger
Even after a successful merger, warrants carry risks that catch investors off guard.
Forced Redemption
Most SPAC warrants include a provision letting the company force redemption once the stock stays above a threshold (often $18.00) for a set number of trading days. Once a forced redemption is announced, you typically have 30 to 45 days to exercise your warrants or sell them on the market. Warrants you don’t exercise before the deadline are redeemed at $0.01 per warrant.1FINRA. SPAC Warrants: 5 Tips to Avoid Missed Opportunities Investors who aren’t watching company announcements can lose their entire warrant position this way.
Dilution
Exercising a warrant means the company issues a new share, and that dilutes existing shareholders. Public warrants are only part of the picture. SPAC sponsors also hold private placement warrants and founder shares that further dilute public investors. The actual dilution depends on how many warrants are outstanding and how many get exercised, but it is never zero.
Expiration
SPAC warrants typically expire five years after the business combination closes. If the stock never climbs above $11.50 during that window, the warrants expire worthless. Unlike the common stock, which had the trust floor before the merger, warrants have no built-in safety net.
Cost Basis When You Separate a Unit
Splitting a unit forces you to allocate your original purchase price between the common stock and the warrant for tax purposes. The IRS generally requires that when you buy a package of securities for a single price, you split the cost basis based on each component’s relative fair market value at the time of the split.
In practice, brokerages handle this differently. Some assign the full $10.00 to the common stock and zero to the warrant. Others use the ratio of the stock price to the warrant price on the first day the components trade separately. Others let you call in and request a specific allocation. The method affects your taxable gain or loss when you sell either piece, so check your cost basis after separation and correct it with your broker if the allocation looks wrong.
Exercising a warrant is not itself a taxable event. Your cost basis in the new shares equals what you paid for the warrant plus the $11.50 exercise price. The holding period for those new shares starts on the exercise date and does not include the time you held the warrant.