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FTSE AIM UK 50
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Top FTSE AIM UK 50 Companies by Market Cap and Stocks in 2025

This is the list of the largest public listed companies in the FTSE AIM UK 50 index ranked by market capitalization, together with links to their reference stock, sector and industry.

FTSE AIM UK 50 Chart & Analysis

Top FTSE AIM UK 50 Companies Ranking by Market Cap as of July 1, 2025

Ranking Company Stock Market Cap (USD) Country Sector Industry
31 Polar Capital Holdings plc POLR wb_incandescent $627.1 M United Kingdom UK Financials UK Asset Management
32 Advanced Medical Solutions Group plc AMS wb_incandescent $613.3 M United Kingdom UK Healthcare UK Medical Instruments & Supplies
33 Silence Therapeutics plc SLN wb_incandescent $588.4 M

(Nov. 1, 2021)

 United Kingdom UK Healthcare UK Biotechnology
34 FW Thorpe plc TFW wb_incandescent $529.0 M United Kingdom UK Industrials UK Electrical Equipment & Parts
35 ASOS plc ASC wb_incandescent $500.4 M United Kingdom UK Consumer Discretionary UK Internet Retail
36 Numis Corporation plc NUM wb_incandescent $465.4 M

(July 1, 2023)

 United Kingdom UK Financials UK Capital Markets
37 RWS Holdings plc RWS wb_incandescent $456.5 M United Kingdom UK Industrials UK Consulting Services
38 Alliance Pharma plc APH wb_incandescent $413.8 M

(Jan. 1, 2025)

 United Kingdom UK Healthcare UK Drug Manufacturers—Specialty & Generic
39 Central Asia Metals plc CAML wb_incandescent $390.8 M United Kingdom UK Basic Materials UK Copper
40 Next Fifteen Communications Group plc NFC wb_incandescent $341.9 M United Kingdom UK Communication Services UK Advertising Agencies
41 Impax Asset Management Group plc IPX wb_incandescent $337.4 M United Kingdom UK Financials UK Asset Management
42 dotdigital Group plc DOTD wb_incandescent $313.9 M United Kingdom UK Technology UK Software—Application
43 Midwich Group plc MIDW wb_incandescent $309.4 M United Kingdom UK Technology UK Electronics & Computer Distribution
44 Ceres Power Holdings plc CWR wb_incandescent $277.6 M United Kingdom UK Industrials UK Electrical Equipment & Parts
45 Knights Group Holdings plc KGH wb_incandescent $236.0 M United Kingdom UK Industrials UK Specialty Business Services
46 Gooch & Housego plc GHH wb_incandescent $227.4 M United Kingdom UK Technology UK Electronic Components
47 Frontier Developments plc FDEV wb_incandescent $175.7 M United Kingdom UK Communication Services UK Electronic Gaming & Multimedia
48 IQE plc IQE wb_incandescent $134.1 M United Kingdom UK Technology UK Semiconductor Equipment & Materials
49 Watkin Jones plc WJG wb_incandescent $99.3 M United Kingdom UK Consumer Discretionary UK Residential Construction
50 iomart Group plc IOM wb_incandescent $46.0 M United Kingdom UK Technology UK Software—Infrastructure
51 Scapa Group plc SCPA wb_incandescent United Kingdom UK Basic Materials UK Specialty Chemicals

Top FTSE AIM UK 50 Companies Ranking by Market Cap as of July 1, 2025

31. Polar Capital Holdings plc

Company Profile: Polar Capital Holdings plc
Market Cap (USD): $627.1 M
Stock: POLR wb_incandescent
Country: United Kingdom
Sector: UK Financials
Industry: UK Asset Management

32. Advanced Medical Solutions Group plc

Company Profile: Advanced Medical Solutions Group plc
Market Cap (USD): $613.3 M
Stock: AMS wb_incandescent
Country: United Kingdom
Sector: UK Healthcare
Industry: UK Medical Instruments & Supplies

33. Silence Therapeutics plc

Company Profile: Silence Therapeutics plc
Market Cap (USD): $588.4 M (Nov. 1, 2021)
Stock: SLN wb_incandescent
Country: United Kingdom
Sector: UK Healthcare
Industry: UK Biotechnology

34. FW Thorpe plc

Company Profile: FW Thorpe plc
Market Cap (USD): $529.0 M
Stock: TFW wb_incandescent
Country: United Kingdom
Sector: UK Industrials
Industry: UK Electrical Equipment & Parts

35. ASOS plc

Company Profile: ASOS plc
Market Cap (USD): $500.4 M
Stock: ASC wb_incandescent
Country: United Kingdom
Sector: UK Consumer Discretionary
Industry: UK Internet Retail

36. Numis Corporation plc

Company Profile: Numis Corporation plc
Market Cap (USD): $465.4 M (July 1, 2023)
Stock: NUM wb_incandescent
Country: United Kingdom
Sector: UK Financials
Industry: UK Capital Markets

37. RWS Holdings plc

Company Profile: RWS Holdings plc
Market Cap (USD): $456.5 M
Stock: RWS wb_incandescent
Country: United Kingdom
Sector: UK Industrials
Industry: UK Consulting Services

38. Alliance Pharma plc

Company Profile: Alliance Pharma plc
Market Cap (USD): $413.8 M (Jan. 1, 2025)
Stock: APH wb_incandescent
Country: United Kingdom
Sector: UK Healthcare
Industry: UK Drug Manufacturers—Specialty & Generic

39. Central Asia Metals plc

Company Profile: Central Asia Metals plc
Market Cap (USD): $390.8 M
Stock: CAML wb_incandescent
Country: United Kingdom
Sector: UK Basic Materials
Industry: UK Copper

40. Next Fifteen Communications Group plc

Company Profile: Next Fifteen Communications Group plc
Market Cap (USD): $341.9 M
Stock: NFC wb_incandescent
Country: United Kingdom
Sector: UK Communication Services
Industry: UK Advertising Agencies

41. Impax Asset Management Group plc

Company Profile: Impax Asset Management Group plc
Market Cap (USD): $337.4 M
Stock: IPX wb_incandescent
Country: United Kingdom
Sector: UK Financials
Industry: UK Asset Management

42. dotdigital Group plc

Company Profile: dotdigital Group plc
Market Cap (USD): $313.9 M
Stock: DOTD wb_incandescent
Country: United Kingdom
Sector: UK Technology
Industry: UK Software—Application

43. Midwich Group plc

Company Profile: Midwich Group plc
Market Cap (USD): $309.4 M
Stock: MIDW wb_incandescent
Country: United Kingdom
Sector: UK Technology
Industry: UK Electronics & Computer Distribution

44. Ceres Power Holdings plc

Company Profile: Ceres Power Holdings plc
Market Cap (USD): $277.6 M
Stock: CWR wb_incandescent
Country: United Kingdom
Sector: UK Industrials
Industry: UK Electrical Equipment & Parts

45. Knights Group Holdings plc

Company Profile: Knights Group Holdings plc
Market Cap (USD): $236.0 M
Stock: KGH wb_incandescent
Country: United Kingdom
Sector: UK Industrials
Industry: UK Specialty Business Services

46. Gooch & Housego plc

Company Profile: Gooch & Housego plc
Market Cap (USD): $227.4 M
Stock: GHH wb_incandescent
Country: United Kingdom
Sector: UK Technology
Industry: UK Electronic Components

47. Frontier Developments plc

Company Profile: Frontier Developments plc
Market Cap (USD): $175.7 M
Stock: FDEV wb_incandescent
Country: United Kingdom
Sector: UK Communication Services
Industry: UK Electronic Gaming & Multimedia

48. IQE plc

Company Profile: IQE plc
Market Cap (USD): $134.1 M
Stock: IQE wb_incandescent
Country: United Kingdom
Sector: UK Technology
Industry: UK Semiconductor Equipment & Materials

49. Watkin Jones plc

Company Profile: Watkin Jones plc
Market Cap (USD): $99.3 M
Stock: WJG wb_incandescent
Country: United Kingdom
Sector: UK Consumer Discretionary
Industry: UK Residential Construction

50. iomart Group plc

Company Profile: iomart Group plc
Market Cap (USD): $46.0 M
Stock: IOM wb_incandescent
Country: United Kingdom
Sector: UK Technology
Industry: UK Software—Infrastructure

51. Scapa Group plc

Company Profile: Scapa Group plc
Stock: SCPA wb_incandescent
Country: United Kingdom
Sector: UK Basic Materials
Industry: UK Specialty Chemicals

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