ALNYLAM UK LIMITED
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Cash
—
Latest balance sheet
Net assets
—
Equity attributable
Employees
121
-0.8% lowest in 3 filed years
Profit before tax
£7m
+95.1% vs 2024
Net assets
3-year trend · vs Health Care median
Accounts
3-year trend · Δ = latest vs prior filed period · latest reflected 2025-12-31
| Metric | Trend | 2023-12-31 | 2024-12-31 | 2025-12-31 | Δ vs prior |
|---|---|---|---|---|---|
| Turnover | £75,751,413 | £75,169,645 | £84,596,528 | +12.5% | |
| Operating profit | £2,863,519 | £3,147,121 | £6,499,045 | +106.5% | |
| Profit before tax | £106,257,062 | £3,577,299 | £6,977,861 | +95.1% | |
| Net profit | £107,202,366 | £2,914,426 | £7,474,305 | +156.5% | |
| Cash | £7,257,446 | £9,268,598 | — | — | |
| Total assets less current liabilities | £43,597,229 | £46,476,453 | — | — | |
| Net assets | £43,514,109 | £46,428,535 | — | — | |
| Equity | £43,514,109 | £46,428,535 | — | — | |
| Average employees | 122 | 122 | 121 | -0.8% | |
| Wages | £24,041,547 | £27,963,104 | £20,984,003 | -25% | |
| Directors' remuneration | — | — | — | — |
Values shown as filed in the company's annual accounts. — indicates the figure wasn't present under that line item in that period. The Δ column is the change from the prior filed period as a percentage of |prior|; lines a company doesn't report show —. About these numbers
Ratios
Computed from the line items above — sparklines read oldest → newest
| Ratio | Trend | 2023-12-31 | 2024-12-31 | 2025-12-31 |
|---|---|---|---|---|
| Operating margin | 3.8% | 4.2% | 7.7% | |
| Net margin | 141.5% | 3.9% | 8.8% | |
| Return on capital employed | 6.6% | 6.8% | — | |
| Gearing (liabilities / total assets) | 13.0% | 8.2% | — | |
| Current ratio | 3.63x | 2.42x | — |
Margins divide P&L lines by turnover. Gearing is liabilities over total assets. Current ratio is current assets over creditors falling due within one year. Interest cover is operating profit over absolute finance costs. Sector-distribution context coming next.
Audit & accounting basis
- Accounting basis
- FRS 102
- Reporting scope
- Standalone (parent only)
- Auditor
- PricewaterhouseCoopers LLP
- Audit opinion
- Unqualified (clean)
- Going concern
- Affirmed
“The directors have assessed the Company's ability to continue as a going concern and have a reasonable expectation that the Company has adequate resources to continue in operational existence for at least twelve months from the date of signing these financial statements.”
Group structure
- ALNYLAM UK LIMITED · parent
- Alnylam Switzerland GmbH 100%
- Alnylam France SAS 100%
- Alnylam Germany GmbH 100%
- Alnylam Italy Srl 100%
- Alnylam Sweden AB 100%
- Alnylam Pharmaceuticals Spain SL 100%
- Alnylam Canada ULC 100%
- Alnylam Netherlands BV 100%
- Alnylam Japan K.K. 100%
- Alnylam Austria GmbH 100%
- ALNYPT Unipessoal LDA 100%
- Alnylam Belgium SPRL 100%
- Alnylam Taiwan Co Ltd 100%
- Alnylam Brazil Farmaceutica LTDA 99%
- Alnylam Australia Pty 100%
Significant events
- “On 24 April 2025 the Company liquidated Alnylam Argentina S.R.L. The disposal in the year relates to this liquidation.”
- “On 1 May 2026, the Company changed its registered address from Braywick Gate, Braywick Road, Maidenhead, SL6 1DA, United Kingdom to Point 27 Market Street, Maidenhead, SL6 8AA.”
Auditor, going-concern and subsidiary information is drawn from the narrative of the latest annual accounts. About these numbers
People
4 active · 14 resigned
| Name | Role | Appointed | Born | Nationality |
|---|---|---|---|---|
| GRECO, Arianna | Secretary | 2017-06-16 | — | — |
| PAGNANO, Carlos Arnaldo Dal Secco | Director | 2023-06-06 | Jun 1979 | Brazilian |
| POULTON, Jeffrey Vernon | Director | 2019-08-13 | Nov 1967 | American |
| WITKOS, Katarzyna Maria | Director | 2021-09-13 | May 1972 | Swiss |
Show 14 resigned officers
| Name | Role | Appointed | Resigned |
|---|---|---|---|
| TAYLOR WESSING SECRETARIES LIMITED | Corporate Secretary | 2014-01-31 | 2017-03-09 |
| BOURSIER, Jean-Yves Philippe | Director | 2017-06-16 | 2019-05-02 |
| BURSBY, Richard Michael | Director | 2014-01-31 | 2014-01-31 |
| DELENA, Mary Beth | Director | 2014-01-31 | 2017-06-16 |
| DULAC, Emmanuel | Director | 2017-06-16 | 2017-10-09 |
| GRECO, Arianna | Director | 2020-04-01 | 2021-09-13 |
| HEGGIE, Theresa Marie | Director | 2017-10-09 | 2020-03-31 |
| JONES, David Ronald | Director | 2019-05-27 | 2023-06-06 |
| MASON, Michael Paul | Director | 2014-01-31 | 2017-06-16 |
| REID, Laurence Edward | Director | 2014-01-31 | 2014-12-31 |
| SONI, Manmeet Singh | Director | 2019-05-27 | 2019-08-12 |
| VAISHNAW, Akshay Krishnadas | Director | 2014-01-31 | 2019-05-27 |
| HUNTSMOOR LIMITED | Corporate Director | 2014-01-31 | 2014-01-31 |
| HUNTSMOOR NOMINEES LIMITED | Corporate Director | 2014-01-31 | 2014-01-31 |
Ownership
Persons with significant control
| Name | Kind | Nature of control | Notified | Status |
|---|---|---|---|---|
| Alnylam Pharmaceuticals Inc | Corporate entity | Shares 75–100%, Voting 75–100%, Appoints directors | 2017-01-31 | Active |
Filing timeline
Last 20 of 75 total filings
| Date | Type | Category | Description | |
|---|---|---|---|---|
| 2026-09-30 | AA | accounts | Accounts with accounts type full | |
| 2026-05-01 | AD01 | address | Change registered office address company with date old address new address | |
| 2026-02-12 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2026-02-12 | CH01 | officers | Change person director company with change date | |
| 2026-02-12 | CH01 | officers | Change person director company with change date | |
| 2026-02-12 | AD02 | address | Change sail address company with old address new address | |
| 2026-01-14 | CH01 | officers | Change person director company with change date | |
| 2025-09-29 | AA | accounts | Accounts with accounts type full | |
| 2025-02-11 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2024-10-10 | AA | accounts | Accounts with accounts type full | |
| 2024-02-14 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2023-10-09 | AA | accounts | Accounts with accounts type full | |
| 2023-06-22 | AP01 | officers | Appoint person director company with name date | |
| 2023-06-22 | TM01 | officers | Termination director company with name termination date | |
| 2023-02-16 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2022-10-21 | AA | accounts | Accounts with accounts type full | |
| 2022-08-16 | CH01 | officers | Change person director company with change date | |
| 2022-02-02 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2021-09-28 | AP01 | officers | Appoint person director company with name date | |
| 2021-09-28 | TM01 | officers | Termination director company with name termination date |
Public-record activity
Raw counts from Companies House — last 12–24 months
- Filings
- 7
- Capital events
- 0
- Officers appointed
- 0
- Officers resigned
- 0
last 12 months
last 24 months
last 12 months
last 12 months
Direct counts from the register. No score, no rating — see the Filing timeline for the underlying events.