Spin-Offs and Carve-Outs

A conglomerate that owns two unrelated businesses often trades for less than the two businesses would be worth separately — investors struggle to value a mixed bag, and management attention gets split. Splitting the company in two is a recognized fix, and it comes in two structurally different flavors.

A spin-off distributes shares of the subsidiary directly to existing shareholders, pro rata, for free. If you own 100 shares of ParentCo and it spins off SubCo at a ratio of one SubCo share for every four ParentCo shares, you wake up owning 100 ParentCo shares (now valued lower, having lost the subsidiary) plus 25 new SubCo shares. No cash changes hands and no new investor enters — ownership of the combined pie is unchanged, only its shape.

A carve-out (or equity carve-out) instead sells a minority stake in the subsidiary to the public through an IPO-like process, raising cash for the parent while the parent typically retains majority control. Unlike a spin-off, new outside shareholders now own part of the subsidiary directly, and the parent gets a cash check rather than simply distributing existing value.

$$V_{\text{ParentCo, post}} = V_{\text{ParentCo, pre}} - V_{\text{SubCo}}$$

holds for a pure spin-off: the parent's value falls by exactly the value of what it gave away, because nothing new was created or destroyed, only redistributed.

A worked example

ParentCo trades at $80 and is worth $16bn total (200m shares). It spins off SubCo, distributing one SubCo share per four ParentCo shares held. SubCo is independently valued at $4bn across its 50m new shares, or $80 a share. Post spin-off, ParentCo should be worth $16 - 4 = 12$, i.e. $12bn, or $60 a share (200m shares, unchanged count). A shareholder with 4 ParentCo shares ($320 pre-spin) ends up with 4 ParentCo shares at $60 ($240) plus 1 SubCo share at $80 ($80) — $320 total, unchanged.