Pay vs Performance Disclosure - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pay Versus Performance
The disclosure included in this section is prescribed by SEC rules and does not necessarily align with how we or the Committee view the link between our performance and named executive officer pay. For further information regarding our compensation philosophy and how we seek to align executive compensation with the Company’s performance, refer to the foregoing provisions of this “Executive Compensation” section.
Required Tabular Disclosure of Pay Versus Performance
In accordance with rules adopted by the SEC pursuant to the Dodd-Frank Act, we provide the following disclosure regarding executive compensation for our principal executive officer (“PEO”) and
non-PEO
named executive officers (“Non-PEO
NEOs”) and our performance for the fiscal years listed below. The amounts set forth below under the headings “Compensation Actually Paid to PEO” and “Average Compensation Actually Paid to non-PEO
NEOs” have been calculated in a manner consistent with Item 402(v) of Regulation S-K.
Use of “Compensation Actually Paid” is required by the SEC’s rules and, as a result of the calculation methodology required by the SEC, such amounts differ from compensation actually received by the individuals and the compensation decisions described in the “Compensation Discussion and Analysis” section above. Pay Versus Performance
Fiscal Year |
Summary Compensation Table Total for First PEO 1 |
Compensation Actually Paid to First PEO 2 |
Summary Compensation Table Total for Second PEO 1 |
Compensation Actually Paid to Second PEO 2 |
Average Summary Compensation Table Total for non-PEONEOs 1 |
Average Compensation Actually Paid to non-PEONEOs 2 |
Value of Initial Fixed $100 Investment Based on |
Net Income (Loss) ($M) 4 |
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SLN Total Shareholder Return 3 |
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| 2025 | $ | 2,246,863 | $ | (1,741,202 | ) | $ | 1,274,041 | $ | 1,273,584 | $ | 1,066,413 | $ | 707,806 | $ | 39.87 | $ | (88.61 | ) | ||||||||||||||
| 2024 | $ | 3,693,970 | $ | (3,803,950 | ) | $ | 0 | $ | 0 | $ | 1,438,125 | $ | (375,513 | ) | $ | 28.80 | $ | (45.31 | ) | |||||||||||||
| 2023 | $ | 9,099,969 | $ | 9,739,078 | $ | 0 | $ | 0 | $ | 2,019,064 | $ | 2,113,127 | $ | 72.71 | $ | (54.23 | ) | |||||||||||||||
| (1) | Mr. Tooman was our “First PEO” for each year presented in this table; Iain Ross was appointed as our Interim Principal Executive Officer in December 2025, and accordingly he is the “Second PEO” for purposes of this table. The individuals comprising the Non-PEO NEOs for 2024 and 2023 are our other named executive officers: Ms. Hellums and Dr. Romano. |
| (2) | The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by our named executive officers. These amounts reflect the amounts in the Total column of the Summary Compensation Table above with certain adjustments made in accordance with Item 402(v) of Regulation S-K as follows: |
Fiscal Year |
Executives |
Total from Summary Compensation Table |
Grant Date Value of New Awards |
Year End Value of Unvested Awards |
Change in Value of Unvested Awards Granted in Prior Fiscal Years |
Change in Value of Vested Awards Granted in Prior Fiscal Years |
Fair Value of Vested Awards Granted and Vested in Current Fiscal Year |
Fair Value at End of Prior Fiscal Year of Awards That Failed to Meet Vesting Conditions |
Total Equity Award Adjustments |
Compensation Actually Paid |
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| 2025 | PEO: Iain Ross | $ | 1,274,041 | $ | (1,257,000 | ) | $ | 1,261,745 | $ | (13,799 | ) | $ | (19,222 | ) | $ | 27,820 | $ | 0 | $ | 1,256,543 | $ | 1,273,584 | ||||||||||||||||
| PEO: Craig Tooman | $ | 2,246,863 | $ | (1,528,263 | ) | $ | 0 | $ | (568,049 | ) | $ | (846,813 | ) | $ | 0 | $ | (1,044,940 | ) | $ | (2,459,802 | ) | $ | (1,741,202 | ) | ||||||||||||||
Non-PEO NEOs |
$ | 1,066,413 | $ | (561,613 | ) | $ | 421,414 | $ | (118,913 | ) | $ | (99,493 | ) | $ | 0 | $ | 0 | $ | 203,007 | $ | 707,806 | |||||||||||||||||
| 2024 | PEO: Craig Tooman | $ | 3,693,970 | $ | (2,689,796 | ) | $ | 707,858 | $ | (5,792,293 | ) | $ | 276,312 | $ | 0 | $ | 0 | $ | (4,808,124 | ) | $ | (3,803,950 | ) | |||||||||||||||
Non-PEO NEOs |
$ | 1,438,125 | $ | (793,475 | ) | $ | 208,814 | $ | (1,320,708 | ) | $ | 91,731 | $ | 0 | $ | 0 | $ | (1,020,163 | ) | $ | (375,513 | ) | ||||||||||||||||
| 2023 | PEO: Craig Tooman | $ | 9,099,969 | $ | (7,636,244 | ) | $ | 7,433,279 | $ | 857,133 | $ | (745,252 | ) | $ | 730,193 | $ | 0 | $ | 8,275,353 | $ | 9,739,078 | |||||||||||||||||
Non-PEO NEOs |
$ | 2,019,064 | $ | (1,328,132 | ) | $ | 1,587,922 | $ | 96,082 | $ | (211,788 | ) | $ | 93,039 | $ | (143,060 | ) | $ | 1,422,195 | $ | 2,113,127 | |||||||||||||||||
| (3) | For the relevant fiscal year, “SLN Total Shareholder Return” represents the cumulative total shareholder return (“TSR”) of our ADSs (each representing three ordinary shares). The comparison assumes $100 was invested for the period starting December 31, 2022, through the end of the listed year in our ADSs. Historical stock performance is not necessarily indicative of future stock performance. |
| (4) | The dollar amounts reported represent the amount of net income reflected in our audited financial statements for the applicable year. |
Non-PEO
NEOs for 2024 and 2023 are our other named executive officers: Ms. Hellums and Dr. Romano.
| (2) | The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by our named executive officers. These amounts reflect the amounts in the Total column of the Summary Compensation Table above with certain adjustments made in accordance with Item 402(v) of Regulation S-K as follows: |
Fiscal Year |
Executives |
Total from Summary Compensation Table |
Grant Date Value of New Awards |
Year End Value of Unvested Awards |
Change in Value of Unvested Awards Granted in Prior Fiscal Years |
Change in Value of Vested Awards Granted in Prior Fiscal Years |
Fair Value of Vested Awards Granted and Vested in Current Fiscal Year |
Fair Value at End of Prior Fiscal Year of Awards That Failed to Meet Vesting Conditions |
Total Equity Award Adjustments |
Compensation Actually Paid |
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| 2025 | PEO: Iain Ross | $ | 1,274,041 | $ | (1,257,000 | ) | $ | 1,261,745 | $ | (13,799 | ) | $ | (19,222 | ) | $ | 27,820 | $ | 0 | $ | 1,256,543 | $ | 1,273,584 | ||||||||||||||||
| PEO: Craig Tooman | $ | 2,246,863 | $ | (1,528,263 | ) | $ | 0 | $ | (568,049 | ) | $ | (846,813 | ) | $ | 0 | $ | (1,044,940 | ) | $ | (2,459,802 | ) | $ | (1,741,202 | ) | ||||||||||||||
Non-PEO NEOs |
$ | 1,066,413 | $ | (561,613 | ) | $ | 421,414 | $ | (118,913 | ) | $ | (99,493 | ) | $ | 0 | $ | 0 | $ | 203,007 | $ | 707,806 | |||||||||||||||||
| 2024 | PEO: Craig Tooman | $ | 3,693,970 | $ | (2,689,796 | ) | $ | 707,858 | $ | (5,792,293 | ) | $ | 276,312 | $ | 0 | $ | 0 | $ | (4,808,124 | ) | $ | (3,803,950 | ) | |||||||||||||||
Non-PEO NEOs |
$ | 1,438,125 | $ | (793,475 | ) | $ | 208,814 | $ | (1,320,708 | ) | $ | 91,731 | $ | 0 | $ | 0 | $ | (1,020,163 | ) | $ | (375,513 | ) | ||||||||||||||||
| 2023 | PEO: Craig Tooman | $ | 9,099,969 | $ | (7,636,244 | ) | $ | 7,433,279 | $ | 857,133 | $ | (745,252 | ) | $ | 730,193 | $ | 0 | $ | 8,275,353 | $ | 9,739,078 | |||||||||||||||||
Non-PEO NEOs |
$ | 2,019,064 | $ | (1,328,132 | ) | $ | 1,587,922 | $ | 96,082 | $ | (211,788 | ) | $ | 93,039 | $ | (143,060 | ) | $ | 1,422,195 | $ | 2,113,127 | |||||||||||||||||
| (2) | The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by our named executive officers. These amounts reflect the amounts in the Total column of the Summary Compensation Table above with certain adjustments made in accordance with Item 402(v) of Regulation S-K as follows: |
Fiscal Year |
Executives |
Total from Summary Compensation Table |
Grant Date Value of New Awards |
Year End Value of Unvested Awards |
Change in Value of Unvested Awards Granted in Prior Fiscal Years |
Change in Value of Vested Awards Granted in Prior Fiscal Years |
Fair Value of Vested Awards Granted and Vested in Current Fiscal Year |
Fair Value at End of Prior Fiscal Year of Awards That Failed to Meet Vesting Conditions |
Total Equity Award Adjustments |
Compensation Actually Paid |
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| 2025 | PEO: Iain Ross | $ | 1,274,041 | $ | (1,257,000 | ) | $ | 1,261,745 | $ | (13,799 | ) | $ | (19,222 | ) | $ | 27,820 | $ | 0 | $ | 1,256,543 | $ | 1,273,584 | ||||||||||||||||
| PEO: Craig Tooman | $ | 2,246,863 | $ | (1,528,263 | ) | $ | 0 | $ | (568,049 | ) | $ | (846,813 | ) | $ | 0 | $ | (1,044,940 | ) | $ | (2,459,802 | ) | $ | (1,741,202 | ) | ||||||||||||||
Non-PEO NEOs |
$ | 1,066,413 | $ | (561,613 | ) | $ | 421,414 | $ | (118,913 | ) | $ | (99,493 | ) | $ | 0 | $ | 0 | $ | 203,007 | $ | 707,806 | |||||||||||||||||
| 2024 | PEO: Craig Tooman | $ | 3,693,970 | $ | (2,689,796 | ) | $ | 707,858 | $ | (5,792,293 | ) | $ | 276,312 | $ | 0 | $ | 0 | $ | (4,808,124 | ) | $ | (3,803,950 | ) | |||||||||||||||
Non-PEO NEOs |
$ | 1,438,125 | $ | (793,475 | ) | $ | 208,814 | $ | (1,320,708 | ) | $ | 91,731 | $ | 0 | $ | 0 | $ | (1,020,163 | ) | $ | (375,513 | ) | ||||||||||||||||
| 2023 | PEO: Craig Tooman | $ | 9,099,969 | $ | (7,636,244 | ) | $ | 7,433,279 | $ | 857,133 | $ | (745,252 | ) | $ | 730,193 | $ | 0 | $ | 8,275,353 | $ | 9,739,078 | |||||||||||||||||
Non-PEO NEOs |
$ | 2,019,064 | $ | (1,328,132 | ) | $ | 1,587,922 | $ | 96,082 | $ | (211,788 | ) | $ | 93,039 | $ | (143,060 | ) | $ | 1,422,195 | $ | 2,113,127 | |||||||||||||||||
Relationship Between PEO and
Non-PEO
NEO Compensation Actually Paid and TSR The following chart sets forth the relationship between Compensation Actually Paid to our PEOs and the average Compensation Actually Paid to our
Non-PEO
NEOs on the one hand, and our cumulative TSR over the three most recently completed fiscal years on the other hand. 
Relationship Between PEO and
Non-PEO
NEO Compensation Actually Paid and Net Income The following chart sets forth the relationship between Compensation Actually Paid to our PEOs and the average of Compensation Actually Paid to our
Non-PEO
NEOs on the one hand, and our Net Income during the three most recently completed fiscal years on the other. 
Relationship Between PEO and
Non-PEO
NEO Compensation Actually Paid and TSR The following chart sets forth the relationship between Compensation Actually Paid to our PEOs and the average Compensation Actually Paid to our
Non-PEO
NEOs on the one hand, and our cumulative TSR over the three most recently completed fiscal years on the other hand.