UK SIC 2007 · 30300
Manufacture of air and spacecraft and related machinery (SIC code 30300)
UK aerospace firms file here. The code covers airframe manufacturers, engine builders, avionics, satellites and the component suppliers that feed them. The group is small, but each customer is worth a lot. Most sit around Bristol (Filton), Derby (Rolls-Royce), and the Scottish suppliers near Lossiemouth.
Division 30: Manufacture of other transport equipment
Everything that moves except cars and lorries. Air and spacecraft, 30300, is the largest code, followed by the catch-all 30990 and pleasure boat building at 30120. Shipbuilding and rolling stock sit below the threshold in company terms, which is what you would expect of industries with a handful of very large employers rather than many small ones.
Related SIC codes
Who prospects SIC 30300 companies
Aerospace is the part of this division with the most active supplier market: precision machining, composites, certification and quality consultancy, and specialist recruitment. Boat building is a different world with its own buyers of marine hardware, resins and rigging. The two rarely overlap, so treat 30300 and 30120 as separate markets rather than one division. Aerospace clusters visibly around Bristol and the south west, and boat building around the south coast.
Lead generation for wholesalers & suppliers →How to read SIC 30300
SIC 30300 is a five-digit code, and the digits are not arbitrary. The first two, 30, are the division, manufacture of other transport equipment. Add the third and you have group 303; the fourth narrows it to a class, and the fifth to the subclass, which is the level Companies House actually asks a company to pick. The whole division sits under section C, manufacturing, the broadest tier there is. Reading a code left to right therefore goes from a whole sector down to one activity.
A company chooses its own codes when it incorporates and can change them on any confirmation statement. It may list up to four, and Companies House does not check whether they are right. That is why 30300 is worth reading as a claim the company made about itself rather than as a verified fact, and why the first-position and any-position counts above differ.
Measured on the August 2026 register, the busiest registered-office post towns for 30300 are Cambridge (244), London (169), Bristol (25), Birmingham (13) and Glasgow (13). Those are registered-office locations, which is where the paperwork sits rather than necessarily where the work happens, so treat them as where to start looking rather than as a service area.
Using SIC 30300 as a filter
1,042 companies is 0.02 per cent of the 5,190,464 active companies on the UK register, and ranks 30300 most used of the 3 codes we track in division 30. That is the pool before any filter. Whether it is a big market for you depends on what you sell, but it is the number every other filter on this page cuts down from.
Almost everybody who uses 30300 means it: 891 of 1,042 companies put it first, leaving only 151 carrying it as a secondary code. That makes it an unusually clean filter. You can match on the code alone and trust that the companies you get really are in this line of work.
The population is concentrated: the five busiest post towns hold 45 per cent of it, and Cambridge alone accounts for 23 per cent. If you sell nationally, those five towns are most of the market. If you sell locally and you are not in one of them, expect a much smaller pool and widen the radius early.
In practice the code on its own is rarely the whole filter. Pair 30300 with an incorporation date to catch companies in their first months, when they are still choosing suppliers, or with a filing deadline to reach them while the year end is on their mind. A worked example for this code: 30300, registered office in Cambridge, incorporated in the last ninety days, which turns a 1,042 company pool into a list you can write to in an afternoon. Add the poor-website filter if what you sell is a website, or a recent change of officer if you sell to whoever just took the job. Every company you pull carries the Companies House record, the director's name, a verified website and a verified email, and the ones we cannot complete are not charged.
Where SIC 30300 clusters in the UK
ACTIVE COMPANIES BY REGISTERED-OFFICE POST TOWN · COMPANIES HOUSE REGISTER, AUGUST 2026
SIC 30300 companies, as leads
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About SIC 30300
Where do UK aerospace SIC 30300 firms cluster?
Four areas do most of it. Bristol, around Airbus at Filton and its supply chain. Derby, around Rolls-Royce and its supply chain. Belfast, around Spirit AeroSystems. Then the engine clusters in Lancashire and Yorkshire. About 60% of UK aerospace ltds sit in those four.
Are drone manufacturers filed under SIC 30300?
Yes, when the drone is a heavier-than-air vehicle. Smaller consumer drone makers sometimes file 26701 instead, the code for optical and photographic instruments.
Find UK SIC 30300 companies
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