# EDGAR Filing Document

**Accession Number:** 0001131399
**File Stem:** 0001193125-26-016042
**Filing Date:** 2026-1
**Character Count:** 28315
**Document Hash:** 9b8a7e31a7f8a119738dc56b528ef1d3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-016042.hdr.sgml**: 20260120

**ACCESSION NUMBER**: 0001193125-26-016042

**CONFORMED SUBMISSION TYPE**: SC TO-C

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260120

**DATE AS OF CHANGE**: 20260120

**GROUP MEMBERS**: GLAXOSMITHKLINE LLC

**GROUP MEMBERS**: REDROSE ACQUISITION CO.

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** RAPT Therapeutics, Inc.
- **CENTRAL INDEX KEY:** 0001673772
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 473313701
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SC TO-C
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-91191
- **FILM NUMBER:** 26541274

**BUSINESS ADDRESS:**
- **STREET 1:** 561 ECCLES AVENUE
- **CITY:** SOUTH SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94080
- **BUSINESS PHONE:** (650) 489-9000

**MAIL ADDRESS:**
- **STREET 1:** 561 ECCLES AVENUE
- **CITY:** SOUTH SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94080

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FLX Bio, Inc.
- **DATE OF NAME CHANGE:** 20160504
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** GSK plc
- **CENTRAL INDEX KEY:** 0001131399
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** X0

**FILING VALUES:**
- **FORM TYPE:** SC TO-C

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 79 NEW OXFORD STREET
- **CITY:** LONDON
- **PROVINCE COUNTRY:** X0
- **ZIP:** WC1A 1DG
- **BUSINESS PHONE:** 44 20 8047 5000

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 79 NEW OXFORD STREET
- **CITY:** LONDON
- **PROVINCE COUNTRY:** X0
- **ZIP:** WC1A 1DG

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GSK PLC
- **DATE OF NAME CHANGE:** 20220516

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GLAXOSMITHKLINE PLC
- **DATE OF NAME CHANGE:** 20010105

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**SCHEDULE TO** 

**Tender Offer Statement Under Section 14(d)(1) or 13(e)(1)** 

**of the Securities Exchange Act of 1934** 

**RAPT THERAPEUTICS, INC.** 

(Name of Subject Company)

**REDROSE ACQUISITION CO.,** 

**GLAXOSMITHKLINE LLC** 

**and** 

**GSK PLC** 

(Name of Filing Persons (Offerors))

**Common Stock, par value $0.0001 per share** 

(Title of Class of Securities)

**75382E208** 

(CUSIP Number of Class of Securities)

**David Rea** 

**GlaxoSmithKline LLC** 

**1250 South Collegeville Road** 

**Collegeville, PA 19426** 

**+1 215-219-7521** 

(Name, Address and Telephone Number of Person Authorized

to Receive Notices and Communications on Behalf of Filing Persons)

Copy to:

**George Karafotias** 

**Beth Troy** 

**Allen Overy Shearman Sterling US LLP** 

**599 Lexington Avenue** 

**New York, NY 10022** 

**Telephone: +1 (212) 848-4000** 

**Calculation of Filing Fee** 

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| **Transaction Valuation** | **Amount of Filing Fee** |
|  N/A | N/A |

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☐ Check the box if any part of the fee is offset as provided by Rule 0-11(a)(2) and identify the filing with which the offsetting fee was previously paid. Identify the previous filing by registration statement number, or the Form or Schedule and date of its filing.

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| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Amount Previously Paid: N/A | Filing Party: N/A |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Form or Registration No.: N/A | Date Filed: N/A |

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☒ Check the box if the filing relates solely to preliminary communications made before the commencement of a
tender offer.

Check the appropriate boxes below to designate any transactions to which the statement relates:

☒ third-party tender offer subject to Rule 14d-1.

☐ issuer tender offer subject to Rule 13e-4.

☐ going-private transaction subject to Rule 13e-3.

☐ amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results of the tender offer: ☐

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**SCHEDULE TO** 

The pre-commencement communication filed under cover of this Tender Offer Statement on Schedule TO are being filed by GSK plc, a public limited company organized under the laws of England and Wales ("<u>GSK plc</u>"), pursuant to General Instruction D to Schedule TO relate to a planned cash tender offer for all of the issued and outstanding shares of common stock, par value $0.0001 per share (the "<u>Shares</u>"), of RAPT Therapeutics, Inc., a Delaware corporation (the "<u>Company</u>"), pursuant to an Agreement and Plan of Merger, dated as of January 19, 2026, by and among GlaxoSmithKline LLC, a Delaware limited liability company and a wholly-owned subsidiary of GSK plc ("<u>Parent</u>"), Redrose Acquisition Co., a Delaware corporation and a wholly-owned subsidiary of Parent ("<u>Purchaser</u>"), the Company, and solely for purposes of Section 8.11 therein, GSK plc, a public limited company organized under the laws of England and Wales.

**Additional Information** 

The tender offer for the Shares referenced in this announcement has not yet commenced. This announcement is for informational purposes only and is neither an offer to purchase nor a solicitation of an offer to sell Shares or any other securities, nor is it a substitute for the tender offer materials that GSK plc, Parent and Purchaser will file or cause to be filed with the Securities and Exchange Commission (the "<u>SEC</u>") upon the commencement of the tender offer. At the time the tender offer is commenced, GSK plc, Parent and Purchaser will file or cause to be filed with the SEC a tender offer statement on Schedule TO (the "<u>Tender Offer Statement</u>"), and the Company will file with the SEC a solicitation/recommendation statement on Schedule 14D-9 (the "<u>Solicitation/Recommendation Statement</u>"), in each case, with respect to the tender offer. **THE TENDER OFFER STATEMENT (INCLUDING AN OFFER TO PURCHASE, A RELATED LETTER OF TRANSMITTAL AND CERTAIN OTHER TENDER OFFER DOCUMENTS), AND THE SOLICITATION/RECOMMENDATION STATEMENT WILL CONTAIN IMPORTANT INFORMATION. STOCKHOLDERS OF THE COMPANY ARE URGED TO READ THESE DOCUMENTS CAREFULLY WHEN THEY BECOME AVAILABLE (AS EACH MAY BE AMENDED OR SUPPLEMENTED FROM TIME TO TIME) BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION THAT HOLDERS OF SHARES SHOULD CONSIDER BEFORE MAKING ANY DECISION WITH RESPECT TO THE TENDER OFFER.** The tender offer for Shares will be made only pursuant to the Offer to Purchase, the Letter of Transmittal and related documents filed as a part of the Tender Offer Statement. The Tender Offer Statement (including the Offer to Purchase, the related Letter of Transmittal and certain other tender offer documents), as well as the Solicitation/Recommendation Statement, will be made available to all holders of Shares at no expense to them. The Tender Offer Statement and the Solicitation/Recommendation Statement will be made available for free at the SEC's website at www.sec.gov. Copies of the documents filed by GSK plc, Parent and Purchaser with the SEC will also be available free of charge on GSK plc's website at https://www.gsk.com/en-gb/investors or by contacting GSK plc's investor relations department at gsk.investor.relations@gsk.com. Copies of the documents filed by the Company with the SEC will also be available free of charge on the Company's investor relations website at https://investors.rapt.com/investor-relations. In addition, stockholders of the Company may obtain free copies of the tender offer materials by contacting the information agent for the tender offer that will be named in the Tender Offer Statement.

**Forward-looking Statements** 

GSK plc cautions investors that any forward-looking statements or projections made by GSK plc, including those made in this announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Such factors include, but are not limited to, those described in the "Risk Factors" section in GSK plc's Annual Report on Form 20-F for the year ended December 31,

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2024. The pre-commencement communication filed under cover of this Tender Offer Statement on Schedule TO include forward-looking statements related to the Company, ozureprubart and the acquisition of the Company by GSK plc, Parent and Purchaser that are subject to risks, uncertainties and other factors. All statements other than statements of historical fact are statements that could be deemed forward-looking statements, including all statements regarding the intent, belief or current expectation of the Company and members of its senior management team and can typically be identified by words such as "believe," "expect," "estimate," "predict," "target," "potential," "likely," "continue," "ongoing," "could," "should," "intend," "may," "might," "plan," "seek," "anticipate," "project" and similar expressions, as well as variations or negatives of these words. Forward-looking statements include, without limitation, statements regarding the business combination, similar transactions, prospective performance, future plans, events, expectations, performance, objectives and opportunities and the outlook for the Company's business; the commercial success of the Company's products; the anticipated timing of clinical data and regulatory filings or approvals relating to products; the possibility of favourable or unfavourable results from clinical trials; the anticipated benefits of the acquisition; filings and approvals relating to the transaction; the expected timing of the completion of the transaction; the parties' ability to complete the transaction; and the accuracy of any assumptions underlying any of the foregoing. Investors are cautioned that any such forward-looking statements are not guarantees of future performance and involve risks and uncertainties and are cautioned not to place undue reliance on these forward-looking statements. Actual results may differ materially from those currently anticipated due to a number of risks and uncertainties. Risks and uncertainties that could cause the actual results to differ from expectations contemplated by forward-looking statements include: uncertainties as to the timing of the tender offer and completion of the merger; the possibility that various closing conditions for the transaction may not be satisfied or waived, including that the Company stockholders may not tender into the offer a majority of the Shares outstanding at the time of the expiration of the offer or that required regulatory approvals may not be obtained or are obtained subject to conditions that are not anticipated; the occurrence of any event, change or other circumstance that could give rise to the termination of the agreement and plan of merger; the failure to realize anticipated benefits of the proposed acquisition when expected or at all; potential adverse reactions or changes to business relationships resulting from the proposed acquisition, including the effect of the announcement, pendency or consummation of the acquisition on the ability of the Company to retain and hire key personnel or maintain key vendor, supplier or partner relationships; risks that the proposed acquisition disrupts the current plans and operations of the Company; transaction costs; risks associated with potential litigation or regulatory actions related to the transaction; and other risks and uncertainties described from time to time in documents filed with the SEC by the Company, including current reports on Form 8-K, quarterly reports on Form 10-Q and annual reports on Form 10-K, as well as the Solicitation/Recommendation Statement to be filed by the Company, or in GSK plc's Annual Report on Form 20-F for the year ended December 31, 2024 filed with the SEC by GSK plc, as well as the Tender Offer Statement to be filed by GSK plc, Parent and Purchaser. All forward-looking statements are based on information currently available to GSK plc and the Company neither GSK plc nor the Company assumes any obligation to update any forward-looking statements.

**\*\*\*** 

**Item 12.** **Exhibits.** <br>

[(a)(5)(a)](d40908dex99a5a.htm) [Joint Press Release, dated January 20, 2026](d40908dex99a5a.htm)

## Ex-99.(A)(5)(A)

**Exhibit 99.(a)(5)(a)** 

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| **Stock-exchange announcement**<br> For media and investors only | ![LOGO](g40908g0116075916452.jpg) |

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Issued: 20 January 2026, London UK

GSK enters agreement to acquire RAPT Therapeutics

• Acquisition includes ozureprubart, a potentially best-in-class anti-IgE antibody, in development for prophylactic protection against food allergens

• Ozureprubart offers potential to protect against food allergy reactions with less frequent dosing compared to existing standard-of-care therapy

• Food allergies are increasing with significant unmet need and serious health risks

• Acquisition adds to Respiratory, Immunology & Inflammation pipeline

GSK plc (LSE/NYSE: GSK) today announced that it has entered a definitive agreement to acquire RAPT Therapeutics ("RAPT") (NASDAQ: RAPT), a California-based, clinical-stage biopharmaceutical company dedicated to developing novel therapies for patients living with inflammatory and immunologic diseases. The acquisition includes ozureprubart, a long-acting anti-immunoglobulin E (IgE) monoclonal antibody, currently in phase IIb clinical development for prophylactic protection against food allergens.

IgE is a clinically validated target and is the only approved systemic therapy shown to protect patients from a harmful allergic and inflammatory immune response. Around 94% of severe food allergies are caused by IgE-mediated reactions.<sup>1</sup>

Current anti-IgE treatment for food allergy involves injections every 2 to 4 weeks, which can be a significant burden, particularly since most patients are children. Ozureprubart's clinical profile offers the potential for less frequent dosing of every 12 weeks, supporting improved compliance and patient outcomes; as well as providing a new option to approximately 25% of patients currently ineligible for existing therapy. Ozureprubart complements GSK's extensive commercial footprint and prescriber base in allergy.

Data from the phase IIb trial (prestIgE) assessing use of ozureprubart as monotherapy is expected in 2027, with phase III trials to be focused on both at-risk adult and paediatric populations. In the US, over 17 million people are diagnosed with food allergies, with more than 1.3 million people suffering severe reactions.<sup>2,3,4</sup> This results in more than 3 million patient visits each year to hospital and emergency care.<sup>5</sup>

**Tony Wood, Chief Scientific Officer, GSK said:** "The addition of ozureprubart brings another promising new, potential best-in-class treatment to GSK's pipeline. Food allergies cause severe health impacts to patients with existing treatment requiring injections as frequently as every 2 weeks. Ozureprubart offers the opportunity to bring sustained protection to patients with dosing every 12 weeks, and is consistent with our approach to acquire assets that address validated targets and where there is clear unmet medical need."

**Brian Wong, President & Chief Executive Officer, RAPT Therapeutics, said**: "We are excited to enter into this agreement with GSK, which offers an attractive path forward for our programs, particularly the opportunity we envision for ozureprubart in food allergy. This transaction has the potential to provide access to the global development and commercialisation capabilities, resources and infrastructure that GSK has to offer and ultimately bring added value to our pipeline, patients and stockholders."

**Financial considerations** 

Under the terms of the agreement, GSK will pay RAPT Therapeutics shareholders $58.00 per share at closing for an estimated aggregate equity value of $2.2 billion. Net of cash acquired, GSK's estimated upfront investment is $1.9 billion.

 <br> Press release 1

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| **Stock-exchange announcement**<br> For media and investors only | ![LOGO](g40908g0116075916452.jpg) |

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The transaction gives GSK the global rights to the ozureprubart programme, excluding mainland China, Macau, Taiwan and Hong Kong. GSK will also be responsible for success-based milestone and royalty payments for ozureprubart owed to RAPT's partner, Shanghai Jeyou Pharmaceutical Co., Ltd.

Under the terms of the agreement, GSK's subsidiary is obligated to commence a tender offer to acquire all outstanding shares of RAPT common stock for $58.00 per share in cash within 10 business days of signing. The transaction is subject to customary closing conditions, including the tender of a majority of RAPT's outstanding shares of common stock in the tender offer and expiration or termination of the applicable waiting period under the under the Hart-Scott-Rodino Act in the US. Promptly following the closing of the tender offer, GSK will acquire any shares of RAPT that are not tendered in the tender offer through a second-step merger under Delaware law at the tender offer price. GSK will account for the transaction as a business combination.

The transaction is expected to close in the first quarter of 2026.

**Advisors** 

Evercore is acting as exclusive financial advisor and A&O Shearman is serving as legal counsel to GSK in connection with the transaction. J.P. Morgan Securities LLC is acting as exclusive financial advisor and Cooley LLP is serving as legal counsel to RAPT Therapeutics.

**Additional information** 

This press announcement is for informational purposes only and is neither an offer to purchase nor a solicitation of an offer or a recommendation to sell securities, nor is it a substitute for the tender offer materials that GSK, GlaxoSmithKline LLC ("GSK LLC") and its wholly-owned subsidiary, Redrose Acquisition Co. will file with the Securities and Exchange Commission (the "SEC"). The tender offer for the outstanding shares of RAPT Therapeutics common stock described in this press announcement has not commenced. At the time the tender offer is commenced, GSK, GSK LLC and Redrose Acquisition Co. will file, or will cause to be filed, a Schedule TO Tender Offer Statement with the SEC, and, thereafter, RAPT Therapeutics will file a Schedule 14D-9 Solicitation/Recommendation Statement with the SEC, in each case with respect to the tender offer. **The Schedule TO Tender Offer Statement (including an offer to purchase, a related letter of transmittal and other offer documents) and the Schedule 14D-9 Solicitation/Recommendation Statement will contain important information that should be read carefully before any decision is made with respect to the tender offer**. Those materials (once they become available) will be made available to RAPT Therapeutics stockholders at no expense to them by the information agent for the tender offer, which will be announced. In addition, those materials and all other documents filed by or caused to be filed by RAPT Therapeutics or GSK with the SEC will be available at no charge on the SEC's website at <u>www.sec.gov</u>. In addition to the Schedule 14D-9 Solicitation/Recommendation Statement and Schedule TO Offer Statement (once each becomes available), RAPT Therapeutics and GSK file or furnish, as applicable, annual, quarterly and current reports and other information with the SEC. You may read and copy any reports or other information filed by RAPT Therapeutics at the SEC public reference room at 100 F Street, N.E., Washington, D.C. 20549. Please call the SEC at 1-800-0330 for further information on the public reference room. RAPT Therapeutics and GSK filings with the SEC are also available to the public from commercial document-retrieval services and at the SEC's website at <u>www.sec.gov</u>.

**About food allergies** 

In the US, over 17 million people are diagnosed with food allergies, with more than 1.3 million people suffering severe reactions.<sup>2,3,4</sup> Notably, 65% of severe food allergy patients are children and adolescents.<sup>1</sup> This results in more than 3 million patient visits each year to hospital and emergency care.<sup>5</sup> Disease burden is amplified by the frequency and complexity of allergic reactions, which can escalate to anaphylaxis, emergency care and impact a patient's wellbeing and participation in social activities. Collectively, food allergies cost US families an estimated $33 billion in 2024, underscoring the need for more effective and durable therapies.<sup>5</sup>

**About RAPT Therapeutics** 

RAPT Therapeutics is a clinical-stage immunology-based biopharmaceutical company focused on discovering, developing and commercializing novel therapies for patients living with inflammatory and immunologic diseases.

 <br> Press release 2

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| **Stock-exchange announcement**<br> For media and investors only | ![LOGO](g40908g0116075916452.jpg) |

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Utilizing deep and proprietary expertise in immunology, RAPT develops novel molecules that are designed to modulate the critical immune responses underlying these diseases.

**About GSK** 

GSK is a global biopharma company with a purpose to unite science, technology, and talent to get ahead of disease together. Find out more at <u>www.gsk.com</u>.

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| | | | |
|:---|:---|:---|:---|
|  **GSK enquiries** |  |  |  |
|  Media: | Tim Foley | +44 (0) 20 8047 5502 | (London) |
|  | Sarah Clements | +44 (0) 20 8047 5502 | (London) |
|  | Kathleen Quinn | +1 202 603 5003 | (Washington DC) |
|  | Lyndsay Meyer | +1 202 302 4595 | (Washington DC) |
|  Investor Relations: | Constantin Fest | +44 (0) 7831 826525 | (London) |
|  | James Dodwell | +44 (0) 20 8047 2406 | (London) |
|  | Mick Readey | +44 (0) 7990 339653 | (London) |
|  | Steph Mountifield | +44 (0) 7796 707505 | (London) |
|  | Sam Piper | +44 (0) 7824 525779 | (London) |
|  | Jeff McLaughlin | +1 215 751 7002 | (Philadelphia) |
|  | Frannie DeFranco | +1 215 751 3126 | (Philadelphia) |

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**RAPT Therapeutics enquiries** 

Sylvia Wheeler (swheeler@wheelhouselsa.com)

Aljanae Reynolds (areynolds@wheelhouselsa.com)

**Cautionary statement regarding forward-looking statements** 

GSK cautions investors that any forward-looking statements or projections made by GSK, including those made in this announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Such factors include, but are not limited to, those described in the "Risk Factors" section in GSK's Annual Report on Form 20-F for the year ended December 31, 2024. This communication includes forward-looking statements related to RAPT Therapeutics, ozureprubart and the acquisition of RAPT Therapeutics by GSK that are subject to risks, uncertainties and other factors. All statements other than statements of historical fact are statements that could be deemed forward-looking statements, including all statements regarding the intent, belief or current expectation of RAPT Therapeutics and members of its senior management team and can typically be identified by words such as "believe," "expect," "estimate," "predict," "target," "potential," "likely," "continue," "ongoing," "could," "should," "intend," "may," "might," "plan," "seek," "anticipate," "project" and similar expressions, as well as variations or negatives of these words. Forward-looking statements include, without limitation, statements regarding the business combination, similar transactions, prospective performance, future plans, events, expectations, performance, objectives and opportunities and the outlook for RAPT Therapeutics' business; the commercial success of RAPT Therapeutics' products; the anticipated timing of clinical data and regulatory filings or approvals relating to products; the possibility of favourable or unfavourable results from clinical trials; the anticipated benefits of the acquisition; filings and approvals relating to the transaction; the expected timing of the completion of the transaction; the parties' ability to complete the transaction; and the accuracy of any assumptions underlying any of the foregoing. Investors are cautioned that any such forward-looking statements are not guarantees of future performance and involve risks and uncertainties and are cautioned not to place undue reliance on these forward-looking statements. Actual results may differ materially from those currently anticipated due to a number of risks and uncertainties. Risks and uncertainties that could cause the actual results to differ from expectations contemplated by forward-looking statements include: uncertainties as to the timing of the tender offer and completion of the merger; the possibility that various closing conditions for the transaction may not be satisfied or waived, including that RAPT Therapeutics stockholders may not tender into the offer a majority of the shares of common stock outstanding at the time of the expiration of the offer or that required regulatory approvals may not be obtained or are obtained subject to conditions that are not anticipated; the occurrence of any event, change or other circumstance that could give rise to the termination of the merger agreement; the failure to realize anticipated benefits of the proposed acquisition when expected or at all; potential adverse reactions or changes to business relationships resulting from the proposed acquisition, including the effect of the announcement, pendency or consummation of the acquisition on the ability of RAPT Therapeutics to retain and hire key personnel or maintain key vendor, supplier or partner relationships; risks that the proposed acquisition disrupts the current plans and operations of RAPT Therapeutics; transaction costs; risks associated with potential litigation or regulatory actions related to the transaction; and other risks and uncertainties described from time to time in documents filed with the SEC by RAPT Therapeutics, including current reports on Form 8-K, quarterly reports on Form 10-Q and annual reports on Form 10-K, as well as the Schedule 14D-9 to be filed by RAPT Therapeutics, or in GSK's Annual Report on Form 20-F for the year ended December 31, 2024 filed with the SEC by GSK, as well as the Schedule TO to be filed by GSK. All forward- looking statements are based on information currently available to GSK and RAPT Therapeutics, and neither GSK nor RAPT Therapeutics assumes any obligation to update any forward-looking statements.

**Registered in England & Wales:** 

No. 3888792

**Registered Office:** 

79 New Oxford Street

London

WC1A 1DG

**References** 

1 GSK Epi assessment based on MarketScan and Optum claims database

 <br> Press release 3

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| **Stock-exchange announcement**<br> For media and investors only | ![LOGO](g40908g0116075916452.jpg) |

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2 Warren CM, Aktas ON, Manalo LJ, Bartell TR, Gupta RS. The epidemiology of multifood allergy in the United States: a population-based study. Ann Allergy Asthma Immunol. 2023;130(5):637-648.e5.

3 US Census Bureau. Age and Sex, American Community Survey, ACS 1-Year Estimates Subject Tables, Table S0101, 2022. Accessed 9 January, 2026. <u>https://data.census.gov/table/ACSST1Y2022.S0101</u>.

4 MarketScan's overall prevalence, and Optum's age-stratified (<18; 18+) and overall prevalence. Severe FA defined as patients with ER/inpatient visit or under specialist care.

5 FARE Food Allergy Facts and Statistics for the US (April 2024).

 <br> Press release 4