DIAMOND LIGHT SOURCE LIMITED
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Cash
£31m
+28.5% highest in 3 filed years
Net assets
£344m
+18.4% highest in 3 filed years
Employees
886
+2.5% highest in 3 filed years
Profit before tax
£53m
+35.2% highest in 3 filed years
Net assets
3-year trend · vs Industrials median
Accounts
3-year trend · Δ = latest vs prior filed period · latest reflected 2026-03-31
| Metric | Trend | 2024-03-31 | 2025-03-31 | 2026-03-31 | Δ vs prior |
|---|---|---|---|---|---|
| Turnover | £120,457,319 | £164,128,679 | £180,332,520 | +9.9% | |
| Operating profit | -£11,962,167 | £39,411,038 | £53,638,018 | +36.1% | |
| Profit before tax | -£12,036,286 | £39,527,209 | £53,456,289 | +35.2% | |
| Net profit | -£12,036,286 | £39,527,209 | £53,456,289 | +35.2% | |
| Cash | £22,762,238 | £24,371,961 | £31,307,625 | +28.5% | |
| Total assets less current liabilities | £300,481,336 | £338,313,901 | — | — | |
| Net assets | £250,760,588 | £290,287,797 | £343,744,086 | +18.4% | |
| Equity | £250,760,588 | £290,287,797 | £343,744,086 | +18.4% | |
| Average employees | 824 | 864 | 886 | +2.5% | |
| Wages | £42,605,050 | £45,237,008 | £47,563,168 | +5.1% | |
| Directors' remuneration | £240,173 | £331,694 | £350,083 | +5.5% |
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 | 2024-03-31 | 2025-03-31 | 2026-03-31 |
|---|---|---|---|---|
| Operating margin | -9.9% | 24.0% | 29.7% | |
| Net margin | -10.0% | 24.1% | 29.6% | |
| Return on capital employed | -4.0% | 11.6% | — | |
| Gearing (liabilities / total assets) | 23.6% | 22.8% | 21.9% | |
| Current ratio | 1.32x | 1.22x | 1.18x | |
| Interest cover | -10.89x | 33.66x | 39.74x |
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.
Name history
Renamed 1 time since incorporation
- DIAMOND LIGHT SOURCE LIMITED 2002-03-26 → present
- CODENOTE LIMITED 2002-02-18 → 2002-03-26
Audit & accounting basis
- Accounting basis
- IFRS
- Reporting scope
- Standalone (parent only)
- Auditor
- Grant Thornton UK LLP
- Audit opinion
- Unqualified (clean)
- Going concern
- Affirmed
“Management prepares a budget, mid-year forecast and 10-year plan annually, this is consistent with the business model of the Company, that it is reliant on ongoing funding from its shareholders to be a going concern. The shareholders are parties to a Joint Venture Agreement, to which Diamond is itself a party, and have approved an Operating Budget for 2026/27 in accordance with that agreement. In addition, STFC (part of UKRI) as the principal shareholder has given assurance to the Directors expressing their continuing support for Diamond, for at least 12 months from the accounts being signed, which is subject to the financial allocation of funding from UKRI. Accordingly, the Directors are confident that Diamond is a going concern and therefore the financial statements have been prepared on that basis.”
Significant events
- “The Company in November 2025 sold the non-controlling interest of 10% in Quantum Detectors Ltd replacing the ordinary share investment with fixed term loan notes due to a financial restructure.”
Auditor, going-concern and subsidiary information is drawn from the narrative of the latest annual accounts. About these numbers
People
9 active · 39 resigned
| Name | Role | Appointed | Born | Nationality |
|---|---|---|---|---|
| HIRD, Sean Michael, Dr | Secretary | 2024-12-31 | — | — |
| BORYSIEWICZ, Leszek Krzysztof, Professor Sir | Director | 2024-12-07 | Apr 1951 | British |
| BOTTON, Gianluigi Andrea, Dr | Director | 2023-10-12 | Oct 1963 | Canadian,Italian |
| ECCLESTON, Roger Soulsby, Professor | Director | 2025-04-01 | May 1965 | British |
| FITZPATRICK, Michael Edward, Professor | Director | 2016-10-11 | Jul 1970 | British |
| FOREMAN, Morag Helen, Dr | Director | 2022-03-29 | Apr 1979 | British |
| GRANT, Victoria Louise | Director | 2024-06-28 | Apr 1984 | British |
| OYSTON, Petra Claire Farquhar, Dr | Director | 2025-10-01 | Feb 1966 | British |
| WARD, Andrea | Director | 2019-04-23 | Aug 1973 | British |
Show 39 resigned officers
| Name | Role | Appointed | Resigned |
|---|---|---|---|
| COMFORT, John | Secretary | 2002-03-27 | 2013-12-11 |
| GREEN, Christopher James, Dr | Secretary | 2021-03-12 | 2021-10-11 |
| GREGORY, Linda | Secretary | 2022-03-29 | 2024-12-31 |
| RICHARDS, Andrew Peter | Secretary | 2014-03-06 | 2021-03-12 |
| STEWART, John Gillespie | Secretary | 2002-02-26 | 2002-03-27 |
| SDG SECRETARIES LIMITED | Corporate Nominee Secretary | 2002-02-18 | 2002-02-26 |
| AKERMAN, Andrew Christopher | Director | 2009-10-01 | 2014-12-31 |
| BOWSHER, Brian Robert, Dr | Director | 2016-11-01 | 2018-03-31 |
| BROERS, Alec Nigel, Sir | Director | 2008-09-01 | 2014-07-31 |
| BURNETT, Keith, Professor | Director | 2007-06-01 | 2008-08-31 |
| COLSON, Deborah Jill, Doctor | Director | 2007-04-16 | 2007-11-19 |
| COOKSEY, David James Scott, Sir | Director | 2002-03-27 | 2008-08-31 |
| CURSON, Anna | Director | 2021-02-01 | 2022-02-17 |
| DAVIES, Graham James, Professor | Director | 2003-10-01 | 2007-06-01 |
| DAVIES, Philip Leon Marshall | Director | 2007-06-01 | 2023-12-31 |
| GIBSON, Ian Paul, Dr | Director | 2002-03-27 | 2002-11-30 |
| HARRISON, Andrew, Professor | Director | 2014-01-01 | 2022-10-31 |
| HENDERSON, Richard, Dr | Director | 2002-03-27 | 2006-09-06 |
| JEFFREYS, Simon John Lewis | Director | 2010-11-01 | 2015-11-30 |
| LIVETT, Timothy James | Director | 2015-12-01 | 2019-01-31 |
| MATERLIK, Gerhard, Professor | Director | 2002-02-26 | 2013-08-31 |
| MORGAN, Michael James | Director | 2002-03-27 | 2006-09-06 |
| MOULDING, Nigel Philip | Director | 2002-12-02 | 2009-10-01 |
| NAISMITH, James Henderson, Professor | Director | 2007-03-06 | 2016-06-01 |
| PARTRIDGE, Alan, Dr | Director | 2024-01-01 | 2025-03-31 |
| RUFFLES, Philip Charles | Director | 2002-03-27 | 2007-06-01 |
| RYAN, Anthony John, Professor | Director | 2008-09-01 | 2016-06-01 |
| SCHAFER, Alan John, Dr | Director | 2007-11-19 | 2010-10-29 |
| SKENE, Barbara Irene, Dr | Director | 2006-09-06 | 2007-04-16 |
| SMITH, Adrian Frederick Melhuish, Professor | Director | 2014-08-01 | 2024-12-07 |
| THOMSON, Mark Andrew, Professor | Director | 2018-04-01 | 2023-12-31 |
| TIRARD, Jane Helen Mary | Director | 2015-01-05 | 2019-01-31 |
| TURNER, Charles Michael Robertson, Professor | Director | 2019-02-01 | 2021-01-31 |
| WADE, Richard, Dr | Director | 2007-06-01 | 2012-03-01 |
| WILLIAMS, Robert Hughes | Director | 2002-03-27 | 2003-09-30 |
| WILSON, Keith Sanderson, Professor | Director | 2016-10-16 | 2025-09-30 |
| WOMERSLEY, William John, Professor | Director | 2012-04-04 | 2016-10-31 |
| WOOD, John Vivian, Professor | Director | 2002-03-27 | 2007-06-01 |
| SDG REGISTRARS LIMITED | Corporate Nominee Director | 2002-02-18 | 2002-02-26 |
Ownership
Persons with significant control
Filing timeline
Last 20 of 283 total filings
| Date | Type | Category | Description | |
|---|---|---|---|---|
| 2026-07-25 | AA | accounts | Accounts with accounts type full | |
| 2026-06-18 | TM01 | officers | Termination director company with name termination date | |
| 2026-05-08 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2026-05-08 | CH01 | officers | Change person director company with change date | |
| 2026-05-08 | CH01 | officers | Change person director company with change date | |
| 2026-05-07 | CH01 | officers | Change person director company with change date | |
| 2026-05-07 | CH01 | officers | Change person director company with change date | |
| 2025-11-04 | AP01 | officers | Appoint person director company with name date | |
| 2025-10-06 | TM01 | officers | Termination director company with name termination date | |
| 2025-07-30 | AA | accounts | Accounts with accounts type full | |
| 2025-05-12 | CS01 | confirmation-statement | Confirmation statement with no updates | |
| 2025-04-10 | AP01 | officers | Appoint person director company with name date | |
| 2025-04-01 | TM01 | officers | Termination director company with name termination date | |
| 2025-01-08 | AP03 | officers | Appoint person secretary company with name date | |
| 2024-12-31 | TM02 | officers | Termination secretary company with name termination date | |
| 2024-12-17 | AP01 | officers | Appoint person director company with name date | |
| 2024-12-09 | TM01 | officers | Termination director company with name termination date | |
| 2024-08-01 | AA | accounts | Accounts with accounts type full | |
| 2024-07-05 | AP01 | officers | Appoint person director company with name date | |
| 2024-07-05 | SH20 | capital | Legacy |
Public-record activity
Raw counts from Companies House — last 12–24 months
- Filings
- 9
- Capital events
- 0
- Officers appointed
- 1
- Officers resigned
- 1
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.