A stock purchase (or "equity"/"share" purchase) is a deal structure in which the buyer acquires the ownership interests of the target entity itself — its shares (or LLC membership interests) — rather than its individual assets. The company changes hands whole: all of its assets, liabilities, contracts, employees, licenses and history come along automatically, now owned by a new parent.

Why sellers prefer stock deals

  • Single layer of tax. Selling shareholders pay tax once, typically at favorable long-term capital-gains rates, avoiding the double tax that burdens a C-corporation asset sale.
  • A clean break. The seller exits the business entirely — including its liabilities — rather than being left with a residual entity to wind down.
  • Possible QSBS benefit. Founders of qualifying C-corps may exclude a large portion of the gain from federal tax in a stock sale — an exclusion generally unavailable in an asset sale.

Why buyers are cautious

  • Inherited liabilities. The buyer acquires all of the target's obligations, including unknown and contingent ones. The buyer's protection comes from diligence, the seller's representations and indemnities, escrow/holdbacks and R&W insurance — not from the structure itself.
  • No tax step-up. The buyer generally takes a carryover basis in the target's assets, forgoing the future depreciation/amortization deductions an asset deal would create — unless the parties make a §338(h)(10) or §336(e) election to treat the stock sale as an asset sale for tax purposes (available for qualifying S-corp and consolidated-group targets).

The offsetting advantage: contracts stay put

A stock deal's signature benefit is continuity. Because the legal entity does not change — only its owner — the target's contracts, leases, permits and licenses generally remain in force without assignment or consent. For a business whose value lives in non-assignable contracts, regulatory licenses or hard-won permits, this can make a stock purchase (or a reverse triangular merger, which achieves the same continuity) the only practical structure.

How the tax gap gets bridged

Because buyers value the step-up and sellers value single-level taxation, the parties frequently negotiate the structure as a price term. A §338(h)(10) election lets a buyer get asset-sale tax treatment from a stock acquisition; the seller, who may bear extra tax, is typically grossed up so it is no worse off. For S-corporations, an F-reorganization is a common pre-sale step that produces a buyer-friendly asset-style outcome while preserving rollover flexibility.

When stock deals are used

Stock structures are common for larger and public companies, contract- or license-heavy businesses, and S-corp/LLC sellers where the double-tax concern is muted. The closely related statutory and reverse triangular merger structures are the dominant forms for acquiring public companies.

See also

  • Asset purchase — A deal structure in which the buyer acquires specific assets (and assumes specific liabilities) of the target, rather than buying its equity. Generally favoured by buyers for liability and tax reasons.
  • Deal structure — How an acquisition is legally and economically assembled — chiefly the choice between an asset purchase and a stock purchase, and the tax, liability and consent consequences that flow from it.
  • Reverse triangular merger — A merger in which the target survives, having absorbed a subsidiary of the buyer. The most common public-company acquisition structure because it preserves target contracts.
  • Section 338(h)(10) election — A joint U.S. tax election that treats the stock acquisition of a domestic corporation (typically an S-corp or subsidiary) as a deemed asset purchase for tax purposes, giving the buyer a basis step-up.
  • QSBS in M&A — Qualified Small Business Stock — Section 1202 — provides a federal capital-gains exclusion of up to $10M (or 10x basis) on the sale of qualifying C-corp stock held more than five years.
  • Rollover equity — Existing equity that the seller (often the founder or management team) retains in the post-close business rather than cashing out at closing. Standard in PE-backed deals to keep operators incentivised.

External resources

Practitioner guides from Main Street Wealth, the M&A advisory firm that sponsors M&Apedia (how this works):

References & further reading

  1. Investopedia — "Stock Purchase Agreement"
  2. Corporate Finance Institute — "Asset Purchase vs Stock Purchase"
  3. Wall Street Prep — "Asset Purchase vs. Stock Purchase"

Last reviewed by Sukhrobjon Ismoilov on 2026-06-17. See the M&Apedia editorial policy for how articles are written, sourced and updated.

Category: Deal structures