Jones Act

The law requiring goods shipped between U.S. ports to move on American-built, -crewed, -flagged vessels.

Also known as: Merchant Marine Act of 1920, Cabotage Law

What it is

The Jones Act requires that cargo transported between U.S. ports travel on vessels built, owned, flagged, and crewed by Americans. It protects the domestic maritime industry. Waivers are occasionally granted in emergencies.

What it does

The law guarantees demand for U.S. shipbuilders and domestic carriers, especially in coastal, offshore-wind, and Puerto Rico trades. Waiver debates and offshore-wind buildout are catalysts. Investors watch policy and vessel-supply dynamics.

The evidence

Offshore-wind projects have driven demand for Jones Act-compliant vessels, benefiting U.S. shipbuilders and specialized vessel operators.

Best for

U.S. shipbuilders and carriers: HII, MATX (Matson), KEX (Kirby).

Pairs well with

buy-american, appropriations, ndaa

Use cautiously with

Waivers and limited vessel supply complicate the thesis; assuming the Act guarantees smooth capacity ignores fleet shortages.

Cautions

Repeal proposals surface periodically, adding policy risk to the protected franchise.