# EDGAR Filing Document

**Accession Number:** 0001823138
**File Stem:** 0001315863-25-000607
**Filing Date:** 2025-8
**Character Count:** 14017
**Document Hash:** e43898ad4b15a7e5dfb8582a57cb581a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001315863-25-000607.hdr.sgml**: 20250813

**ACCESSION NUMBER**: 0001315863-25-000607

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13G/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250813

**DATE AS OF CHANGE**: 20250813

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Adaptimmune Therapeutics PLC
- **CENTRAL INDEX KEY:** 0001621227
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** X0
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-88833
- **FILM NUMBER:** 251213235

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 60 JUBILEE AVENUE
- **STREET 2:** MILTON PARK
- **CITY:** ABINGDON, OXFORDSHIRE
- **PROVINCE COUNTRY:** X0
- **BUSINESS PHONE:** 44 1235 430000

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 60 JUBILEE AVENUE
- **STREET 2:** MILTON PARK
- **CITY:** ABINGDON, OXFORDSHIRE
- **PROVINCE COUNTRY:** X0

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Adaptimmune Ltd
- **DATE OF NAME CHANGE:** 20141001
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Two Seas Capital LP
- **CENTRAL INDEX KEY:** 0001823138

**ORGANIZATION NAME:**
- **EIN:** 843799363
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

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

**BUSINESS ADDRESS:**
- **STREET 1:** 32 ELM PLACE, 3RD FLOOR
- **CITY:** RYE
- **STATE:** NY
- **ZIP:** 10580
- **BUSINESS PHONE:** 917.536.6028

**MAIL ADDRESS:**
- **STREET 1:** 32 ELM PLACE, 3RD FLOOR
- **CITY:** RYE
- **STATE:** NY
- **ZIP:** 10580

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Kairos Capital Management LP
- **DATE OF NAME CHANGE:** 20200831

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

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**(Amendment No. 2)**

**Issuer:** Adaptimmune Therapeutics PLC

**Title of Class of Securities:** Ordinary Shares, par value GBP 0.001 per share

**CUSIP Number:** 00653A107

**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>Two Seas Capital LP | Names of Reporting Persons<br>Two Seas Capital LP |
|:---|:---|:---|:---|
| 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>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>135484206 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>135484206 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>135484206 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>135484206 |
| 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>8.5% | Percent of Class Represented by Amount in Row (9)<br>8.5% |
| 12. | Type of Reporting Person (See Instructions)<br>IA, PN | Type of Reporting Person (See Instructions)<br>IA, PN |

---

| 1. | Names of Reporting Persons<br>Two Seas Capital GP LLC | Names of Reporting Persons<br>Two Seas Capital GP 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>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>135484206 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>135484206 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>135484206 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>135484206 |
| 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>8.5% | Percent of Class Represented by Amount in Row (9)<br>8.5% |
| 12. | Type of Reporting Person (See Instructions)<br>OO, HC | Type of Reporting Person (See Instructions)<br>OO, HC |

---

| 1. | Names of Reporting Persons<br>Sina Toussi | Names of Reporting Persons<br>Sina Toussi |
|:---|:---|:---|:---|
| 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>135484206 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>135484206 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>135484206 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>135484206 |
| 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>8.5% | Percent of Class Represented by Amount in Row (9)<br>8.5% |
| 12. | Type of Reporting Person (See Instructions)<br>IN, HC | Type of Reporting Person (See Instructions)<br>IN, HC |

---

**Item 1(a). Name of Issuer:**
Adaptimmune Therapeutics PLC

**Item 1(b). Address of Issuer's Principal Executive Offices:**
60 Jubilee Avenue, Milton Park, Abingdon, Oxfordshire, United Kingdom, OX14 4RX

**Item 2(a). Name of Person Filing:**
The Statement is filed on behalf of each of the following persons (collectively, the "Reporting Persons")

(i)	Two Seas Capital LP ("TSC");
(ii)	Two Seas Capital GP LLC ("TSC GP"); and
(iii)	Sina Toussi.

This statement relates to Ordinary Shares, par value GBP 0.001 per share (the "Shares"), held by Two Seas Global (Master) Fund LP (the "Global Fund"). The principal business of TSC is providing investment advice as a registered investment adviser and serving as investment manager to the Global Fund. As such, TSC has been granted investment discretion over portfolio investments, including the Shares, held by or for the account of the Global Fund, including the Global Fund's voting and discretionary decisions. TSC GP serves as general partner of TSC. Sina Toussi serves as the chief investment officer of TSC and managing member of TSC GP.

**Item 2(b). Address of Principal Business Office:**
The address of the principal business office of each of the Reporting Persons is 32 Elm Place - 3rd Floor, Rye, New York 10580.

**Item 2(c). Citizenship:**
(i)	Two Seas Capital LP is a Delaware limited partnership;
(ii)	Two Seas Capital GP LLC is a Delaware limited liability company; and 
(iii)	Sina Toussi is a United States citizen.

**Item 2(d). Title of Class of Securities:**
Ordinary Shares, par value GBP 0.001 per share

**Item 2(e). CUSIP Number:**
00653A107

**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:**

Amount beneficially owned as of June 30, 2025:
TSC - 135,484,206 Shares, represented by 22,580,701 American Depositary Shares
TSC GP - 135,484,206 Shares, represented by 22,580,701 American Depositary Shares
Sina Toussi - 135,484,206 Shares, represented by 22,580,701 American Depositary Shares

**(b) Percent of class:**

Percent of class as of June 30, 2025:
TSC - 8.5%
TSC GP - 8.5%
Sina Toussi - 8.5%
The Shares reported for Item 4 total 135,484,206 Shares, represented by 22,580,701 American Depositary Shares, held by the Global Fund. TSC may be deemed to have sole power to vote and sole power to dispose of the Shares held by the Global Fund, through its capacity as investment adviser of the Global Fund. TSC GP may be deemed to have sole power to vote and sole power to dispose of the Shares held by the Global Fund, through its capacity as general partner of TSC. Sina Toussi may be deemed to have sole power to vote and sole power to dispose of the Shares owned by the Global Fund, through his capacity as Managing Member of TSC GP.
The percentages reported for Item 4(b) are calculated based on a total of 1,590,309,546 Shares outstanding on June 30, 2025, as disclosed in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on August 13, 2025.

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

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

As of June 30, 2025, the Reporting Persons had sole power to vote or to direct the vote of 135,484,206 Shares.

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

As of June 30, 2025, the Reporting Persons had shared power to vote or to direct the vote of 0 Shares.

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

As of June 30, 2025, the Reporting Persons had sole power to dispose or to direct the disposition of 135,484,206 Shares.

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

As of June 30, 2025, the Reporting Persons had shared power to dispose or to direct the disposition of 0 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.**

See disclosure in Item 4, which is incorporated by reference herein.

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

See disclosure in Item 2, which is incorporated by reference herein.

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

Not Applicable

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

—

**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.

**Two Seas Capital LP**

**Date:** 08/13/2025

**By:** /s/ Sina Toussi

**Name & Title:** Sina Toussi / Managing Member of Two Seas Capital GP LLC, its General Partner

**Two Seas Capital GP LLC**

**Date:** 08/13/2025

**By:** /s/ Sina Toussi

**Name & Title:** Sina Toussi / Managing Member

**Sina Toussi**

**Date:** 08/13/2025

**By:** /s/ Sina Toussi

**Name & Title:** Sina Toussi / Self