ALNYLAM UK LIMITED

🌳Matureactive
08871372 · ltd · incorporated 2014-01-31
Investment thesis
Well-run mature business — low negotiation leverage; premium likely.
Why interesting: Textbook target; clean filings, stable trading.
Why risky: No pressure on seller; any deal likely at full price.
Opportunity decay
hardening · 12-months
Already tight — no obvious softening catalysts on the horizon.
  • · Thesis: well-run, low negotiation leverage
🔒Estimated value
—
Upgrade to see
Turnover
—
not disclosed
Net worth
—
book net assets
Opportunity
77/100
Strong
🔔
Follow this company (free)
Email alerts on filings, charges, director changes, gazette notices. No account needed.

Unsubscribe any time from any email. GDPR-respectful.

🔒Generate AI memo →🔒Outreach pack →🔒Corporate story →📑 Reports →Sign in to watch
What this business does
Primary activity: Research and experimental development on biotechnology
Sector: Professional, scientific & technical
Investor take
Pursue
Strong opportunity: active trading company with strong profile and bankable structure.

Opportunity 77/100 (strong), bankability 75/100. Share purchase looks the cleaner deal structure. Most likely exit: share sale to pe / searcher (65/100).

Data confidence

Overall: low (54/100)

Sparse data coverage. Treat AI-generated outputs as preliminary. Manual diligence essential.

Company profile
address, 1 SIC codes, incorporation date
100
Financials
No iXBRL financials extracted
0
Lenders & charges
Confirmed no charges registered
85
Directors & officers
18 officers (4 active, 18 linked, 14 with DOB)
86
Ownership & PSC
1 active PSC(s) of 1 total, 1 with control declared
90
Director network
Network not yet resolved
30
Filing history
74 filings on record
85
Gazette notices
No matching gazette notices (standard for active companies)
60
Opportunity Score
77/100Strong
PassWatchWorth a lookStrongExceptional 

Solid opportunity signal. Worth a dedicated memo and management meeting.

Business quality
70
Active, clean filings, stable charge profile.
Acquirability
70
Strong succession / seller-readiness signals.
Risk profile
82
Few red flags.
Signal strength
90
Good data coverage for analysis.

Recent activity

Last 30 days
0
filings
Last 90 days
1
filing
  • • 1 address
Last 180 days
6
filings
  • • 3 officers
  • • 2 address
  • • 1 confirmation-statement
Counts from Companies House filing history.
Corporate timeline (52 events)Click to expand
  1. 2026-05-01
    📍
    change-registered-office-address-company-with-date-old-address-new-address
    address · AD01
  2. 2026-02-12
    📄
    change-person-director-company-with-change-date
    officers · CH01
  3. 2026-02-12
    📄
    change-person-director-company-with-change-date
    officers · CH01
  4. 2026-02-12
    📍
    change-sail-address-company-with-old-address-new-address
    address · AD02
  5. 2026-01-14
    📄
    change-person-director-company-with-change-date
    officers · CH01
  6. 2025-09-29
    📄
    accounts-with-accounts-type-full
    accounts · AA
  7. 2024-10-10
    📄
    accounts-with-accounts-type-full
    accounts · AA
  8. 2023-10-09
    📄
    accounts-with-accounts-type-full
    accounts · AA
  9. 2023-06-22
    📄
    appoint-person-director-company-with-name-date
    officers · AP01
  10. 2023-06-22
    📄
    termination-director-company-with-name-termination-date
    officers · TM01
  11. 2023-06-06
    ➕
    PAGNANO, Carlos Arnaldo Dal Secco appointed
    director
  12. 2023-06-06
    ➖
    JONES, David Ronald resigned
    director
  13. 2022-10-21
    📄
    accounts-with-accounts-type-full
    accounts · AA
  14. 2022-08-16
    📄
    change-person-director-company-with-change-date
    officers · CH01
  15. 2021-09-28
    📄
    appoint-person-director-company-with-name-date
    officers · AP01
  16. 2021-09-28
    📄
    termination-director-company-with-name-termination-date
    officers · TM01
  17. 2021-09-13
    ➕
    WITKOS, Katarzyna Maria appointed
    director
  18. 2021-09-13
    ➖
    GRECO, Arianna resigned
    director
  19. 2021-09-10
    📄
    change-person-director-company-with-change-date
    officers · CH01
  20. 2021-09-01
    📄
    accounts-with-accounts-type-full
    accounts · AA
  21. 2021-05-11
    📄
    change-person-director-company-with-change-date
    officers · CH01
  22. 2021-03-26
    📄
    second-filing-withdrawal-of-a-person-with-significant-control-statement
    persons-with-significant-control · RP04PSC09
  23. 2021-03-05
    📄
    notification-of-a-person-with-significant-control
    persons-with-significant-control · PSC02
  24. 2020-04-01
    ➕
    GRECO, Arianna appointed
    director
  25. 2020-03-31
    ➖
    HEGGIE, Theresa Marie resigned
    director
  26. 2019-08-13
    ➕
    POULTON, Jeffrey Vernon appointed
    director
  27. 2019-08-12
    ➖
    SONI, Manmeet Singh resigned
    director
  28. 2019-05-27
    ➕
    JONES, David Ronald appointed
    director
  29. 2019-05-27
    ➕
    SONI, Manmeet Singh appointed
    director
  30. 2019-05-27
    ➖
    VAISHNAW, Akshay Krishnadas resigned
    director
  31. 2019-05-02
    ➖
    BOURSIER, Jean-Yves Philippe resigned
    director
  32. 2017-10-09
    ➖
    DULAC, Emmanuel resigned
    director
  33. 2017-10-09
    ➕
    HEGGIE, Theresa Marie appointed
    director
  34. 2017-06-16
    ➕
    GRECO, Arianna appointed
    secretary
  35. 2017-06-16
    ➕
    BOURSIER, Jean-Yves Philippe appointed
    director
  36. 2017-06-16
    ➖
    DELENA, Mary Beth resigned
    director
  37. 2017-06-16
    ➕
    DULAC, Emmanuel appointed
    director
  38. 2017-06-16
    ➖
    MASON, Michael Paul resigned
    director
  39. 2017-03-09
    ➖
    TAYLOR WESSING SECRETARIES LIMITED resigned
    corporate-secretary
  40. 2014-12-31
    ➖
    REID, Laurence Edward resigned
    director
  41. 2014-01-31
    🏢
    Company incorporated
    As ALNYLAM UK LIMITED
  42. 2014-01-31
    ➕
    TAYLOR WESSING SECRETARIES LIMITED appointed
    corporate-secretary
  43. 2014-01-31
    ➕
    BURSBY, Richard Michael appointed
    director
  44. 2014-01-31
    ➖
    BURSBY, Richard Michael resigned
    director
  45. 2014-01-31
    ➕
    DELENA, Mary Beth appointed
    director
  46. 2014-01-31
    ➕
    MASON, Michael Paul appointed
    director
  47. 2014-01-31
    ➕
    REID, Laurence Edward appointed
    director
  48. 2014-01-31
    ➕
    VAISHNAW, Akshay Krishnadas appointed
    director
  49. 2014-01-31
    ➕
    HUNTSMOOR LIMITED appointed
    corporate-director
  50. 2014-01-31
    ➖
    HUNTSMOOR LIMITED resigned
    corporate-director
Showing most recent 50 of 52 events

Owner dependency

58/100
Moderate — manageable with handover

Some founder dependency, but not acute. A structured handover period should cover most risk.

FACTORS
  • +Senior director age: Director aged approximately 59 — approaching natural succession window.

Succession & seller-readiness

40/100
Moderate signal

Some succession indicators present. Worth watching; approach if sector/strategy fits.

SIGNALS
  • secondaryFounder aged 58+: Senior director is approximately 59. Early succession window.

Red flags

1 low
Multiple registered office changes
low

Multiple address changes in a short period can indicate operational instability or admin disorder.

Group structure

Alnylam Pharmaceuticals Inc is the ultimate parent — holding 75%+ shares. This company sits inside their group.

🏛️
Alnylam Pharmaceuticals Inc
Corporate parent · holds 75-100% shares · board control
ultimate parent
⬇
ALNYLAM UK LIMITED
This company · 08871372

Parent relationships inferred from Persons with Significant Control filings. Full subsidiary tree requires reverse-lookup (coming).

Shareholders & ownership

1 active beneficial owner · dominant holder ≥75%
NameSharesVoting rightsNature of controlNotified
Alnylam Pharmaceuticals Inc
Corporate entity
75–100%
75–100%board control75-100% shares · 75-100% voting · board control31/01/2017

From Companies House Persons with Significant Control filings. Share ranges are banded per the public PSC regime.

Similar companies

Active · Professional services · SL postcode area
CompanyEst. valueTurnoverNet worthStaffAgeOppDirector
ALB HOMECARE LTD→
15091670 · est 2023 · no financials extracted
————2y——
ALBARAKA LIMITED→
03876468 · est 1999 · no financials extracted
————26y——
ALDISS GEOLOGICAL CONSULTING LTD→
12719718 · est 2020 · no financials extracted
————5y——
ALEXANDRA ACCOUNTING LIMITED→
10309326 · est 2016 · no financials extracted
————9y——
ALLERGAN HOLDINGS LIMITED→
02303553 · est 1988 · no financials extracted
————37y——
ALLSAFE ENGINEERING LIMITED→
11395775 · est 2018 · no financials extracted
————7y——
ALLTYPE HIRE LTD→
16036193 · est 2024 · no financials extracted
————1y——
ALMAS CONSULTING LTD→
07552449 · est 2011 · no financials extracted
————15y——
ALOIS TECHNOLOGIES LIMITED→
10621417 · est 2017 · no financials extracted
————9y——
ALPACA ALLIANCE CONSULTING LTD→
13708987 · est 2021 · no financials extracted
————4y——
ALPHA CONSTRUCTION (PVT) LTD→
08729861 · est 2013 · no financials extracted
————12y——
ALPHA CONTROLS LIMITED→
03745706 · est 1999 · no financials extracted
————27y——
Peers ranked by estimated value, then turnover, then opportunity score.See all →
🔒Tailored diligence questions

6 specific questions generated from this company's actual signals — liquidity, leverage, director age, charge count, red flags, age-of-company.

Available from the Pro tier upwards.

See pricing →
🔒Advanced scoring suite

Exit-route ranking, improvement thesis, quiet-distress detector, covenant-pressure proxy, extraction monitor, approaching triggers, ownership drift, local cluster, value trap, debt capacity, archetype classification — 48+ scoring modules.

Available from the Pro tier upwards.

See pricing →

Company details

Statusactive
Typeltd
Incorporated2014-01-31
Jurisdictionengland-wales
Primary SIC72110 — Research and experimental development on biotechnology

Registered office

Point
27 Market Street
Maidenhead
SL6 8AA
United Kingdom

Filing status

Accounts
Next due: 2026-09-30
Last made up to: 2024-12-31
Confirmation statement
Next due: 2027-02-14
Last: 2026-01-31

Officers (4 active · 14 resigned)

GRECO, Arianna→
secretary · appointed 2017-06-16
View their other companies + combined net worth →
Active
PAGNANO, Carlos Arnaldo Dal Secco→
director · ~47y · appointed 2023-06-06
View their other companies + combined net worth →
Active
POULTON, Jeffrey Vernon→
director · ~59y · appointed 2019-08-13
View their other companies + combined net worth →
Active
WITKOS, Katarzyna Maria→
director · ~54y · appointed 2021-09-13
View their other companies + combined net worth →
Active
TAYLOR WESSING SECRETARIES LIMITED→
corporate-secretary · appointed 2014-01-31 · resigned 2017-03-09
Resigned
BOURSIER, Jean-Yves Philippe→
director · ~67y · appointed 2017-06-16 · resigned 2019-05-02
Resigned
BURSBY, Richard Michael→
director · ~59y · appointed 2014-01-31 · resigned 2014-01-31
Resigned
DELENA, Mary Beth→
director · ~59y · appointed 2014-01-31 · resigned 2017-06-16
Resigned
DULAC, Emmanuel→
director · ~57y · appointed 2017-06-16 · resigned 2017-10-09
Resigned
GRECO, Arianna→
director · ~54y · appointed 2020-04-01 · resigned 2021-09-13
Resigned
HEGGIE, Theresa Marie→
director · ~66y · appointed 2017-10-09 · resigned 2020-03-31
Resigned
JONES, David Ronald→
director · ~68y · appointed 2019-05-27 · resigned 2023-06-06
Resigned
MASON, Michael Paul→
director · ~52y · appointed 2014-01-31 · resigned 2017-06-16
Resigned
REID, Laurence Edward→
director · ~63y · appointed 2014-01-31 · resigned 2014-12-31
Resigned
SONI, Manmeet Singh→
director · ~49y · appointed 2019-05-27 · resigned 2019-08-12
Resigned
VAISHNAW, Akshay Krishnadas→
director · ~64y · appointed 2014-01-31 · resigned 2019-05-27
Resigned
HUNTSMOOR LIMITED→
corporate-director · appointed 2014-01-31 · resigned 2014-01-31
Resigned
HUNTSMOOR NOMINEES LIMITED→
corporate-director · appointed 2014-01-31 · resigned 2014-01-31
Resigned

Click a director name to see their full track record across all companies.

Recent filings (74 total)

change-registered-office-address-company-with-date-old-address-new-address
address · AD01
2026-05-01
confirmation-statement-with-no-updates
confirmation-statement · CS01
2026-02-12
change-person-director-company-with-change-date
officers · CH01
2026-02-12
change-person-director-company-with-change-date
officers · CH01
2026-02-12
change-sail-address-company-with-old-address-new-address
address · AD02
2026-02-12
change-person-director-company-with-change-date
officers · CH01
2026-01-14
accounts-with-accounts-type-full
accounts · AA
2025-09-29
confirmation-statement-with-no-updates
confirmation-statement · CS01
2025-02-11
accounts-with-accounts-type-full
accounts · AA
2024-10-10
confirmation-statement-with-no-updates
confirmation-statement · CS01
2024-02-14
accounts-with-accounts-type-full
accounts · AA
2023-10-09
appoint-person-director-company-with-name-date
officers · AP01
2023-06-22
termination-director-company-with-name-termination-date
officers · TM01
2023-06-22
confirmation-statement-with-no-updates
confirmation-statement · CS01
2023-02-16
accounts-with-accounts-type-full
accounts · AA
2022-10-21