# EDGAR Filing Document

**Accession Number:** 0001479615
**File Stem:** 0000950170-23-010120
**Filing Date:** 2023-3
**Character Count:** 14744
**Document Hash:** 68493b44282d03ccd143a8a34a286719
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000950170-23-010120.hdr.sgml**: 20230328

**ACCESSION NUMBER**: 0000950170-23-010120

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 4

**CONFORMED PERIOD OF REPORT**: 20230328

**FILED AS OF DATE**: 20230328

**DATE AS OF CHANGE**: 20230328

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Silence Therapeutics plc
- **CENTRAL INDEX KEY:** 0001479615
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** X0

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39487
- **FILM NUMBER:** 23766218

**BUSINESS ADDRESS:**
- **STREET 1:** 72 HAMMERSMITH ROAD
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** W14 8TH
- **BUSINESS PHONE:** 44-0-20-3457 6900

**MAIL ADDRESS:**
- **STREET 1:** 72 HAMMERSMITH ROAD
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** W14 8TH

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**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 6-K**

**REPORT OF FOREIGN PRIVATE ISSUER**

**PURSUANT TO RULE 13a-16 OR 15d-16**

**UNDER THE SECURITIES EXCHANGE ACT OF 1934**

**For the Month of March 2023**

**Commission File Number: 001-39487**

**Silence Therapeutics plc**

(Exact Name of Registrant as Specified in Its Charter)

**72 Hammersmith Road**

**London W14 8TH**

**United Kingdom** 

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  Form 40-F 

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): 

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): 

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Filed as Exhibits 99.1 and 99.2 to this Report on Form 6-K are two press releases of Silence Therapeutics plc, dated March 28, 2023.

**EXHIBIT INDEX**

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| | |
|:---|:---|
| **Exhibit<br>No.** | **Description** |
| 99.1  | Press release, dated March 28, 2023, "[<u>Silence Therapeutics Appoints Dr. Steven Romano as Incoming Chief Medical Officer and Head of Research and Development</u>](sln-ex99_1.htm)" |
| 99.2 | Press release, dated March 28, 2023, "[<u>Silence Therapeutics to Buyback siRNA Complement Assets</u>](sln-ex99_2.htm)" |

---

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**SIGNATURE**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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| | | |
|:---|:---|:---|
| Silence Therapeutics plc | Silence Therapeutics plc | Silence Therapeutics plc |
| By: | /s/ Craig Tooman | /s/ Craig Tooman |
|  | Name: | Craig Tooman |
|  | Title: | President and Chief Executive Officer |

---

Date: March 28, 2023

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## Ex-99

![img248120592_0.jpg](img248120592_0.jpg)

**Exhibit 99.1**

**Silence Therapeutics Appoints Dr. Steven Romano as Incoming Chief Medical Officer and Head of Research and Development** 

-Dr. Romano will succeed Dr. Giles Campion, CMO and Head of R&D, following his retirement by year-end

28 March 2023

LONDON, Silence Therapeutics plc, Nasdaq: SLN ("Silence" or "the Company"), an experienced and innovative biotechnology company committed to transforming people's lives by silencing diseases through precision engineered medicines, today announced the appointment of Steven Romano, MD, as incoming Chief Medical Officer and Head of Research and Development. Dr. Romano will join Silence on April 1, 2023, and work alongside Giles Campion, MD, current CMO and Head of R&D at Silence, to ensure an efficient and smooth transition for Dr. Campion's retirement by year-end.

Dr. Romano has served as non-executive director of the Silence Board since July 2019 following the Company's siRNA collaboration with Mallinckrodt plc for complement-mediated diseases. Since then, Dr. Romano has played a key role overseeing the company's complement portfolio. In a press release issued this morning, Silence announced that it was buying back two of its siRNA assets from Mallinckrodt.

"Giles has been instrumental in leading our R&D efforts to get Silence to where it is today – a clinical stage company advancing multiple programs – and we are grateful for his continued dedication to the company," said Craig Tooman, President and CEO of Silence. "We are very pleased to welcome Steven Romano to our executive team in this crucial role as we enter the next chapter of innovation and growth at Silence. His extensive experience overseeing research and development, regulatory and medical affairs make him the ideal leader to advance our clinical activities and pursue new opportunities to maximize our mRNAi GOLD™ platform technology."

"Being a member of the Silence Board since July 2019, I've developed a deep understanding and appreciation for the company's siRNA platform technology to address a broad range of genetic diseases," said Steven Romano, MD. "I'm honored to assume the leadership of Silence's R&D organization and look forward to building on this strong momentum to help bring transformative medicines to people around the world."

Dr. Romano is also a board-certified psychiatrist with more than 25 years of experience in the pharmaceutical industry, including 16 years at Pfizer. Most recently, he served as executive vice president and chief scientific officer at Mallinckrodt and was responsible for research and development, medical affairs, health economics and outcomes research, safety, pharmacovigilance and regulatory affairs functions. At Pfizer, Dr. Romano served in a series of senior roles, including Senior Vice President, Head, Global Medicines Development, Global Innovative Pharmaceuticals Business. Before Pfizer, he spent four years at Eli Lilly performing clinical research. Dr. Romano received his bachelor's degree in biology from Washington University in St. Louis and his medical degree from the University of Missouri-Columbia. He completed his residency and fellowship at New York Hospital-Cornell Medical Center, where he then served on the medical school faculty for six years.

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![img248120592_0.jpg](img248120592_0.jpg)

**Enquiries:**

---

| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp;**Silence Therapeutics plc**<br>Gem Hopkins, VP, Head of IR and Corporate Communications<br>ir@silence-therapeutics.com<br>| &nbsp;&nbsp;Tel: +1 (646) 637-3208<br>|

---

**About Silence Therapeutics**

Silence Therapeutics is developing a new generation of medicines by harnessing the body's natural mechanism of RNA interference, or RNAi, to inhibit the expression of specific target genes thought to play a role in the pathology of diseases with significant unmet need. Silence's proprietary mRNAi GOLD™ platform can be used to create siRNAs (short interfering RNAs) that precisely target and silence disease-associated genes in the liver, which represents a substantial opportunity. Silence's wholly owned product candidates include SLN360 designed to address the high and prevalent unmet medical need in reducing cardiovascular risk in people born with high levels of lipoprotein(a) and SLN124 designed to address rare hematological diseases. Silence also maintains ongoing research and development collaborations with AstraZeneca, Mallinckrodt Pharmaceuticals and Hansoh Pharma, among others. For more information, please visit https://www.silence-therapeutics.com/.

**Forward-Looking Statements**

Certain statements made in this announcement are forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995 and other securities laws, including with respect to the Company's clinical and commercial prospects, regulatory approvals of the Company's product candidates, potential partnerships or collaborations or payments under new and existing collaborations, the initiation or completion of the Company's clinical trials and the anticipated timing or outcomes of data reports from the Company's clinical trials. These forward-looking statements are not historical facts but rather are based on the Company's current assumptions, beliefs, expectations, estimates and projections about its industry. Words such as 'anticipates,' 'expects,' 'intends,' 'plans,' 'believes,' 'seeks,' 'estimates,' and similar expressions are intended to identify forward-looking statements. These statements are not guarantees of future performance and are subject to known and unknown risks, uncertainties, and other factors, some of which are beyond the Company's control, are difficult to predict, and could cause actual results to differ materially from those expressed or forecasted in the forward-looking statements, including those risks identified in the Company's most recent Admission Document and its Annual Report on Form 20-F filed with the U.S. Securities and Exchange Commission (the "SEC") on March 15, 2023. The Company cautions security holders and prospective security holders not to place undue reliance on these forward-looking statements, which reflect the view of the Company only as of the date of this announcement. The forward-looking statements made in this announcement relate only to events as of the date on which the statements are made. The Company will not undertake any obligation to release publicly any revisions or updates to these forward-looking statements to reflect events, circumstances, or unanticipated events occurring after the date of this announcement except as required by law or by any appropriate regulatory authority.

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## Ex-99

**Exhibit 99.2**

**Silence Therapeutics to Buyback siRNA Complement Assets** 

Deal gives Silence exclusive worldwide rights to two siRNA complement assets

28 March 2023

LONDON, Silence Therapeutics plc, Nasdaq: SLN ("Silence" or "the Company"), an experienced and innovative biotechnology company committed to transforming people's lives by silencing diseases through precision engineered medicines, today announced it will be acquiring back exclusive worldwide rights to two siRNA drug targets under the collaboration agreement with Mallinckrodt Pharmaceuticals for complement-mediated diseases. Under the terms of the agreement, Silence will not make any upfront payment to get the two assets back and Mallinckrodt is eligible to receive future success-based milestones and low single digit royalties on net sales if the projects advance.

"We want to thank Mallinckrodt for their excellent partnership over the last 3 and a half years," said Craig Tooman, President and CEO of Silence. "We are very excited for the opportunity to now have two wholly owned complement assets to add to our portfolio. We continue to see substantial potential for our mRNAi GOLD™ platform across multiple therapeutic areas and look forward to generating more clinical data this year in cardiovascular and hematological diseases."

Silence entered into a collaboration agreement with Mallinckrodt in July 2019 to develop and commercialize three siRNA drug targets designed to silence the complement cascade in complement-mediated disorders. Under the new agreement, Silence will gain rights back to two undisclosed preclinical complement targets. SLN501, the C3 targeting program will remain under the collaboration agreement.

**Enquiries:**

---

| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp;**Silence Therapeutics plc**<br>Gem Hopkins, VP, Head of IR and Corporate Communications<br>ir@silence-therapeutics.com<br>| &nbsp;&nbsp;Tel: +1 (646) 637-3208<br>|

---

**About Silence Therapeutics**

Silence Therapeutics is developing a new generation of medicines by harnessing the body's natural mechanism of RNA interference, or RNAi, to inhibit the expression of specific target genes thought to play a role in the pathology of diseases with significant unmet need. Silence's proprietary mRNAi GOLD™ platform can be used to create siRNAs (short interfering RNAs) that precisely target and silence disease-associated genes in the liver, which represents a substantial opportunity. Silence's wholly owned product candidates include SLN360 designed to address the high and prevalent unmet medical need in reducing cardiovascular risk in people born with high

------

levels of lipoprotein(a) and SLN124 designed to address rare hematological diseases. Silence also maintains ongoing research and development collaborations with AstraZeneca, Mallinckrodt Pharmaceuticals and Hansoh Pharma, among others. For more information, please visit https://www.silence-therapeutics.com/.

**Forward-Looking Statements**

Certain statements made in this announcement are forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995 and other securities laws, including with respect to the Company's clinical and commercial prospects, regulatory approvals of the Company's product candidates, potential partnerships or collaborations or payments under new and existing collaborations, the initiation or completion of the Company's clinical trials and the anticipated timing or outcomes of data reports from the Company's clinical trials. These forward-looking statements are not historical facts but rather are based on the Company's current assumptions, beliefs, expectations, estimates and projections about its industry. Words such as 'anticipates,' 'expects,' 'intends,' 'plans,' 'believes,' 'seeks,' 'estimates,' and similar expressions are intended to identify forward-looking statements. These statements are not guarantees of future performance and are subject to known and unknown risks, uncertainties, and other factors, some of which are beyond the Company's control, are difficult to predict, and could cause actual results to differ materially from those expressed or forecasted in the forward-looking statements, including those risks identified in the Company's most recent Admission Document and its Annual Report on Form 20-F filed with the U.S. Securities and Exchange Commission (the "SEC") on March 15, 2023. The Company cautions security holders and prospective security holders not to place undue reliance on these forward-looking statements, which reflect the view of the Company only as of the date of this announcement. The forward-looking statements made in this announcement relate only to events as of the date on which the statements are made. The Company will not undertake any obligation to release publicly any revisions or updates to these forward-looking statements to reflect events, circumstances, or unanticipated events occurring after the date of this announcement except as required by law or by any appropriate regulatory authority.

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