| Action | What happens mechanically | Your portfolio after |
|---|---|---|
| Forward stock split (e.g., 2-for-1) | Share count multiplies by 2, share price divides by 2 | Same total value, same percentage ownership, twice as many shares -- no economic change |
| Reverse split (e.g., 1-for-10) | Share count divides by 10, share price multiplies by 10 | Same total value -- often done to meet exchange listing minimums; sometimes a warning sign |
| Spin-off | Parent distributes shares of a subsidiary to existing holders pro rata; original cost basis is allocated across both stubs | You now own two tickers; allocation rules between parent and spin-co are set in the spin-off documents and the IRS Form 8937 |
| DRIP (Dividend Reinvestment Plan) | Each cash dividend automatically buys fractional shares at the post-dividend price | Share count grows over time without needing new cash; cost basis tracked per lot at each reinvestment |
| Special dividend | One-time cash distribution outside the regular dividend cycle; stock drops by approximately the dividend amount on ex-date | Cash in pocket; lower share price; total economic value unchanged at the instant of payment |
Splits do not create value. A 4-for-1 split on a $400 stock turns one share at $400 into four shares at $100. Your ownership stake, your dividend entitlement, your voting weight -- all unchanged. The case for a split is psychological (lower share price increases the pool of buyers who can afford an even lot) and mechanical for indexes (some index providers cap single-stock weights). It is NOT economic. Press releases describing a split as 'unlocking shareholder value' are confusing narrative with mechanics.
Cost basis after a spin-off. When a parent spins off a subsidiary, the IRS requires you to ALLOCATE your original cost basis across the two stocks based on their relative values immediately after separation. Your broker normally does this automatically using the issuer's Form 8937 disclosure. The number that matters: the SUM of basis across the two stubs equals your old basis, plus or minus a tiny rounding. Forgetting this on your tax return causes you to either overpay (treating the spin-co basis as zero) or underpay (treating both stubs as having the original full basis) when you eventually sell.
Ex-dividend date is what matters for cash dividends. To receive a dividend, you must own the stock at the close on the day BEFORE the ex-date (the record date is mostly an internal back-office concept that follows ex-date by one business day in current US settlement). Buying on the ex-date itself does NOT entitle you to the dividend. The stock price drops by approximately the dividend amount at the open on the ex-date -- so 'buying just for the dividend' usually nets to zero before taxes, and worse after. Dividend capture is rarely profitable for retail.
DRIPs compound mechanically. Every reinvested dividend buys additional shares -- usually at the post-ex-date price -- and those new shares earn the next dividend. Over decades the effect is large for any sustained-payer. The brokerage statement view: each reinvestment is a new tax lot with its own cost basis and holding-period clock, which complicates the eventual sale slightly but is otherwise the cleanest possible compounding mechanism for income-paying stocks.
Sit with the ideas.
Wickham Holdings owns 500 shares of Parent Industries (PI) bought at $80/share, total basis $40,000. PI completes a spin-off of its specialty division, SpinCo (SC), distributing one SpinCo share for every two Parent shares held. Immediately after separation, PI trades at $60 and SC trades at $30. The issuer's Form 8937 instructs holders to allocate the original cost basis 67% to PI and 33% to SC based on relative post-spin trading prices. What is Wickham's basis in each holding, and what is the most common cost-basis mistake on a transaction like this?