# EDGAR Filing Document

**Accession Number:** 0001816590
**File Stem:** 0001104659-25-078711
**Filing Date:** 2025-8
**Character Count:** 12696
**Document Hash:** 3a8271b5520101b6872cad084104af79
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-078711.hdr.sgml**: 20250814

**ACCESSION NUMBER**: 0001104659-25-078711

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13G

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250814

**DATE AS OF CHANGE**: 20250814

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** COMPASS Pathways plc
- **CENTRAL INDEX KEY:** 0001816590
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** X0
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-92194
- **FILM NUMBER:** 251220240

**BUSINESS ADDRESS:**
- **STREET 1:** 3RD FLOOR, 1 ASHLEY ROAD
- **STREET 2:** ALTRINCHAM
- **CITY:** CHESIRE
- **STATE:** X0
- **ZIP:** WA14 2DT
- **BUSINESS PHONE:** 1-716-676-6461

**MAIL ADDRESS:**
- **STREET 1:** 3RD FLOOR, 1 ASHLEY ROAD
- **STREET 2:** ALTRINCHAM
- **CITY:** CHESIRE
- **STATE:** X0
- **ZIP:** WA14 2DT

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Compass Rx Ltd.
- **DATE OF NAME CHANGE:** 20200701
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Nantahala Capital Management, LLC
- **CENTRAL INDEX KEY:** 0001472322

**ORGANIZATION NAME:**
- **EIN:** 201151760
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G

**BUSINESS ADDRESS:**
- **STREET 1:** 130 MAIN ST.
- **STREET 2:** 2ND FLOOR
- **CITY:** NEW CANAAN
- **STATE:** CT
- **ZIP:** 06840
- **BUSINESS PHONE:** 203-404-1172

**MAIL ADDRESS:**
- **STREET 1:** 130 MAIN ST.
- **STREET 2:** 2ND FLOOR
- **CITY:** NEW CANAAN
- **STATE:** CT
- **ZIP:** 06840

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**Issuer:** COMPASS Pathways plc

**Title of Class of Securities:** American Depositary Shares, each representing one ordinary share, par value of GBP 0.008 per share

**CUSIP Number:** 20451W101

**Date of Event Which Requires Filing of this Statement:** 06/30/2025

**Check the appropriate box to designate the rule pursuant to which this Schedule is filed:**

- [x] Rule 13d-1(b)

- [ ] Rule 13d-1(c)

- [ ] Rule 13d-1(d)

---

| 1. | Names of Reporting Persons<br>Nantahala Capital Management, LLC | Names of Reporting Persons<br>Nantahala Capital Management, LLC |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>MA | Citizenship or Place of Organization<br>MA |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>5934315.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>5934315.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>5934315.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>5934315.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>6.23% | Percent of Class Represented by Amount in Row (9)<br>6.23% |
| 12. | Type of Reporting Person (See Instructions)<br>IA | Type of Reporting Person (See Instructions)<br>IA |

---

| 1. | Names of Reporting Persons<br>Wilmot B. Harkey | Names of Reporting Persons<br>Wilmot B. Harkey |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>X1 | Citizenship or Place of Organization<br>X1 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>5934315.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>5934315.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>5934315.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>5934315.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>6.23% | Percent of Class Represented by Amount in Row (9)<br>6.23% |
| 12. | Type of Reporting Person (See Instructions)<br>HC | Type of Reporting Person (See Instructions)<br>HC |

---

| 1. | Names of Reporting Persons<br>Daniel Mack | Names of Reporting Persons<br>Daniel Mack |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>X1 | Citizenship or Place of Organization<br>X1 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>5934315.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>5934315.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>5934315.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>5934315.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>6.23% | Percent of Class Represented by Amount in Row (9)<br>6.23% |
| 12. | Type of Reporting Person (See Instructions)<br>HC | Type of Reporting Person (See Instructions)<br>HC |

---

**Item 1(a). Name of Issuer:**
COMPASS Pathways plc

**Item 1(b). Address of Issuer's Principal Executive Offices:**
33 Broadwick Street London, UNITED KINGDOM, W1F 0DQ

**Item 2(a). Name of Person Filing:**
(1) Nantahala Capital Management, LLC ("Nantahala")
(2) Wilmot B. Harkey
(3) Daniel Mack (together the "Reporting Persons")

**Item 2(b). Address of Principal Business Office:**
130 Main St.  2nd Floor, New Canaan, Connecticut 06840

**Item 2(c). Citizenship:**
(1) Nantahala is a Massachusetts limited liability company.
(2) Each of Messrs. Harkey and Mack is a citizen of the United States of America.

**Item 2(d). Title of Class of Securities:**
American Depositary Shares, each representing one ordinary share, par value of GBP 0.008 per share

**Item 2(e). CUSIP Number:**
20451W101

**Item 3. If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:**

(a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e) [x] An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f) [ ] An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g) [x] A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h) [ ] A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i) [ ] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j) [ ] A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), if filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:

(k) [ ] Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

**Item 4. Ownership:**

**(a) Amount beneficially owned:**

As of June 30, 2025, Nantahala may be deemed to be the beneficial owner of 5,934,315 Shares held by funds and separately managed accounts under its control, and as the managing members of Nantahala, each of Messrs. Harkey and Mack may be deemed to be a beneficial owner of those Shares. The 5,934,315 Shares includes 1,754,385 Shares which may be acquired by the Reporting Persons within sixty days through the exercise of warrants.

**(b) Percent of class:**

As of June 30, 2025, each of the Reporting Persons may be deemed to be the beneficial owner of the following percentage of the total number of Shares outstanding:
(1) Nantahala Capital Management, LLC ("Nantahala") : 6.23%
(2) Wilmot B. Harkey: 6.23%
(3) Daniel Mack: 6.23%

**(c) Number of shares as to which the person has:**

**(i) Sole power to vote or to direct the vote:**

(1) Nantahala Capital Management, LLC ("Nantahala") :  0 Shares.
(2) Wilmot B. Harkey:  0 Shares.
(3) Daniel Mack: 0 Shares.

**(ii) Shared power to vote or to direct the vote:**

(1) Nantahala Capital Management, LLC ("Nantahala") :  5,934,315 Shares.
(2) Wilmot B. Harkey:  5,934,315 Shares.
(3) Daniel Mack: 5,934,315 Shares.

**(iii) Sole power to dispose or to direct the disposition of:**

(1) Nantahala Capital Management, LLC ("Nantahala") :  0 Shares.
(2) Wilmot B. Harkey:  0 Shares.
(3) Daniel Mack: 0 Shares.

**(iv) Shared power to dispose or to direct the disposition of:**

(1) Nantahala Capital Management, LLC ("Nantahala") :  5,934,315 Shares.
(2) Wilmot B. Harkey:  5,934,315 Shares.
(3) Daniel Mack: 5,934,315 Shares.

**Item 5. Ownership of Five Percent or Less of a Class.**

[x] If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following.

**Item 6. Ownership of More than 5 Percent on Behalf of Another Person.**

Not Applicable

**Item 7. Identification and Classification of the Subsidiary**

Each of Messrs. Harkey and Mack is filing this Schedule 13G as a control person in respect of shares beneficially owned by Nantahala, an investment adviser as described in ss. 240.13d-1(b)(1)(ii)(E).  See Item 4(a).

**Item 8. Identification and Classification of Members of the Group**

Not Applicable

**Item 9. Notice of Dissolution of Group**

Not Applicable

**Item 10. Certification:**

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Nantahala Capital Management, LLC**

**Date:** 08/13/2025

**By:** /s/ Taki Vasilakis

**Name & Title:** Taki Vasilakis / Chief Compliance Officer

**Wilmot B. Harkey**

**Date:** 08/13/2025

**By:** /s/ Wilmot B. Harkey

**Name & Title:** Wilmot B. Harkey

**Daniel Mack**

**Date:** 08/13/2025

**By:** /s/ Daniel Mack

**Name & Title:** Daniel Mack