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Marketing or advertising agency companies in the Belfast area

319 marketing or advertising agency companies have a registered office in the Belfast area (BT postcodes), and 90 of them were formed in 2025 or 2026. In their latest accounts, the typical one held £19,898 in cash and owed £17,580 at year end.

Companies House register, 1 September 2026, and accounts filed in the last twelve months. Compared with the official category “Advertising agencies” (SIC 73110). Covers companies with a registered office in BT postcodes, including Belfast, Derry, Londonderry, Lisburn.

The numbers

Marketing or advertising agency companies in the Belfast area (BT postcodes) compared with the same category across the UK. Typical figures are medians.
MeasureBelfastUK
Registered companies31933,083
Formed in 2025 or 202690 (28%)33%
Being struck off or in liquidation33 (10%)9.2%
Typical cash at year end£19,89833 accounts£17,802
Typical amount owed at year end£17,580154 accounts£14,687
Typical number of employees1161 accounts1

What this means if you’re starting one

You can start without much equipment

The typical marketing or advertising agency company in the Belfast area (BT postcodes) carries £5,973 of equipment and other fixed assets after depreciation, lower than 94% of UK industries.

Most of the cost of entry is time and running costs rather than kit, so a small test is cheap.

Most of your competition will be other newcomers

28% of the 319 marketing or advertising agency companies in the Belfast area (BT postcodes) were formed in 2025–26, against 19% of all companies in the Belfast area (BT postcodes). Nationally, that share of new companies is higher than 92% of UK industries.

New rivals are arriving faster than in most trades, so your customers already have fresh options. Being new is not a difference on its own.

the Belfast area (BT postcodes) has fewer of these businesses than most places

Marketing or advertising agency companies are 0.36% of companies registered in the Belfast area (BT postcodes), against 0.61% UK-wide (0.6× the national share).

That could be a gap or a sign of weak demand. The register cannot tell which.

Planning a business like this in Belfast?

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What these figures can’t tell you

Companies are counted where their registered office is, which may be an accountant or a home address rather than a shop. Sole traders and partnerships are not on the register, and electronically filed accounts cover roughly 60–75% of accounts filed each year. The figures describe companies that exist; they cannot prove demand for your idea or predict whether it will work. How the figures are built.

Marketing or advertising agency in other places

Other businesses in Belfast

All business benchmarks in Belfast