# EDGAR Filing Document

**Accession Number:** 0001730430
**File Stem:** 0001104659-25-071413
**Filing Date:** 2025-7
**Character Count:** 21933
**Document Hash:** 69950e402bac9d3649f253185ee9453f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-071413.hdr.sgml**: 20250729

**ACCESSION NUMBER**: 0001104659-25-071413

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 14

**CONFORMED PERIOD OF REPORT**: 20250729

**ITEM INFORMATION**: Results of Operations and Financial Condition

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20250729

**DATE AS OF CHANGE**: 20250729

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Kiniksa Pharmaceuticals International, plc
- **CENTRAL INDEX KEY:** 0001730430
- **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:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38492
- **FILM NUMBER:** 251157562

**BUSINESS ADDRESS:**
- **STREET 1:** 23 OLD BOND STREET, FLOOR 3
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** WIS 4PZ
- **BUSINESS PHONE:** 7814319100

**MAIL ADDRESS:**
- **STREET 1:** 23 OLD BOND STREET, FLOOR 3
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** WIS 4PZ

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Kiniksa Pharmaceuticals, Ltd.
- **DATE OF NAME CHANGE:** 20180205

?xml version='1.0' encoding='ASCII'?

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934**

Date of Report (Date of earliest event reported): **July 29, 2025**

**Kiniksa Pharmaceuticals International, plc**

(Exact name of Registrant as Specified in Its Charter)

---

| | | |
|:---|:---|:---|
| **England and Wales** | **001-730430** | **98-1795578** |
| (State or other jurisdiction of<br> incorporation or organization) | (Commission<br> File Number) | (I.R.S. Employer <br> Identification No.) |

---

**23 Old Bond Street, Floor 3**

**London, W1S 4PZ**

**England, United Kingdom**

(Address of principal executive offices, including zip code)

**(781) 431-9100**

(Registrant's telephone number, including area code)

**N/A**

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions

◻ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

◻ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

◻ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

◻ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading <br> Symbol(s)** | **Name of each exchange on which<br> registered** |
| Class A Ordinary Shares, $0.000273235 nominal value | KNSA | The Nasdaq Stock Market LLC |
|  |  | (Nasdaq Global Select Market) |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ◻

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

**Item 2.02. Results of Operations and Financial Condition.**

On July 29, 2025, Kiniksa Pharmaceuticals International, plc issued a press release announcing financial results for the quarter ended June 30, 2025. A copy of the press release is furnished with this Current Report on Form 8-K as Exhibit 99.1.

**Item 9.01. Financial Statements and Exhibits.**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) Exhibits

---

| | |
|:---|:---|
| **Exhibit<br> No.** | **Description** |
| [99.1](tm2521890d1_ex99-1.htm) | [Earnings Press Release issued by Kiniksa Pharmaceuticals International, plc, dated July 29, 2025](tm2521890d1_ex99-1.htm) |
| 104 | Cover Page Interactive Data File (embedded within the inline XBRL document) |

---

**SIGNATURES**

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 hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | KINIKSA PHARMACEUTICALS INTERNATIONAL, PLC | KINIKSA PHARMACEUTICALS INTERNATIONAL, PLC |
| Date: July 29, 2025 | By: | /s/ Madelyn Zeylikman |
|  |  | Madelyn Zeylikman |
|  |  | Senior Vice President, General Counsel and Secretary |

---

## Exhibit 99.1

**Exhibit 99.1**

![](tm2521890d1_ex99-1img01.jpg)

**Kiniksa Pharmaceuticals Reports Second Quarter 2025 Financial Results and Recent Portfolio Execution**

*– ARCALYST<sup>®</sup> (rilonacept) Q2 2025 net product revenue of $156.8 million, representing 52% year-over-year growth –*

*– ARCALYST 2025 expected net product revenue increased to $625 - $640 million –*

*– KPL-387 Phase 2/3 clinical trial in recurrent pericarditis initiated; Phase 2 data expected in 2H 2026 –*

*– Cash balance increased by $39.4 million in Q2 2025 to $307.8 million –*

*– Conference call and webcast scheduled for 8:30 am ET today –*

**London** **– July 29, 2025** – <u>Kiniksa Pharmaceuticals International, plc</u> (Nasdaq: KNSA) (Kiniksa), a biopharmaceutical company developing and commercializing novel therapies for diseases with unmet need, with a focus on cardiovascular indications, today reported second quarter 2025 financial results and recent portfolio execution.

"Our robust commercial performance in the second quarter was driven by expanding ARCALYST penetration across the recurrent pericarditis population, supported by growth among both new and repeat prescribers. For 2025, we've raised our ARCALYST net sales guidance to between $625 and $640 million from between $590 and $605 million. This represents 52% year-over-year growth at the midpoint, highlighting the ongoing strength of the ARCALYST commercialization more than four years after launch," said Sanj K. Patel, Chairman and Chief Executive Officer of Kiniksa. "In addition, we are excited that the Phase 2 dose-focusing portion of the pivotal Phase 2/3 clinical trial of KPL-387 in recurrent pericarditis is now recruiting. We expect data from this part of the study in the second half of 2026 and potential market entry in the 2028/2029 timeframe."

**<u>Portfolio Execution</u>**

**ARCALYST (IL-1α and IL-1β cytokine trap)**

&nbsp;&nbsp;&nbsp;&nbsp;· ARCALYST net product revenue was $156.8 million for the second quarter of
2025. &nbsp;&nbsp;&nbsp;&nbsp;· Since launch, more than 3,475 prescribers have written ARCALYST prescriptions
for recurrent pericarditis.

&nbsp;&nbsp;&nbsp;&nbsp;· As of the end of the second quarter of 2025, average total duration of ARCALYST
therapy in recurrent pericarditis was approximately 30 months.

&nbsp;&nbsp;&nbsp;&nbsp;· As of the end of the second quarter of 2025, approximately 15% of the target
14,000 multiple-recurrence patients were actively on ARCALYST treatment.

**KPL-387 (monoclonal antibody IL-1 receptor antagonist)**

&nbsp;&nbsp;&nbsp;&nbsp;· Kiniksa is recruiting patients in the dose-focusing portion of the Phase
2/3 clinical trial of KPL-387 in recurrent pericarditis. The company expects data from this portion of the trial in the second half of
2026. Subsequently, Kiniksa plans to initiate the pivotal portion of the trial.

**KPL-1161 (Fc-modified monoclonal antibody IL-1 receptor antagonist)**

&nbsp;&nbsp;&nbsp;&nbsp;· Kiniksa is conducting Investigational New Drug (IND)-enabling development
activities with a target profile of quarterly subcutaneous (SC) dosing.

**<u>Financial Results</u>**

&nbsp;&nbsp;&nbsp;&nbsp;· Total revenue for the second quarter of 2025 was $156.8 million, compared
to $108.6 million for the second quarter of 2024.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Kiniksa did not record any license and collaboration revenue for the second quarter of 2025, compared to $5.2 million for the second
quarter of 2024.

&nbsp;&nbsp;&nbsp;&nbsp;· Total operating expenses for the second quarter of 2025 were $136.6 million,
compared to $108.7 million for the second quarter of 2024.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Total operating expenses for the second quarter of 2025 included $52.4 million in collaboration expenses, which were driven by ARCALYST
collaboration profitability, compared to $30.0 million for the second quarter of 2024.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Total operating expenses for the second quarter of 2025 included $8.9 million in non-cash, share-based compensation expense, compared
to $7.4 million for the second quarter of 2024.

&nbsp;&nbsp;&nbsp;&nbsp;· Net income for the second quarter of 2025 was $17.8 million, compared to
a net loss of $3.9 million for the second quarter of 2024.

&nbsp;&nbsp;&nbsp;&nbsp;· As of June 30, 2025, Kiniksa had $307.8 million of cash, cash equivalents,
and short-term investments and no debt.

**<u>Financial Guidance</u>**

&nbsp;&nbsp;&nbsp;&nbsp;· Kiniksa expects 2025 ARCALYST net product revenue of between $625 million
and $640 million, compared to prior guidance of between $590 million and $605 million.

&nbsp;&nbsp;&nbsp;&nbsp;· Kiniksa expects its current operating plan to remain cash flow positive on
an annual basis.

**<u>Conference Call Information</u>**

&nbsp;&nbsp;&nbsp;&nbsp;· Kiniksa will host a conference call and webcast
at 8:30 a.m. Eastern Time on Tuesday, July 29, 2025, to discuss second
quarter 2025 financial results and recent portfolio execution.

&nbsp;&nbsp;&nbsp;&nbsp;· Individuals
 interested in participating in the call via telephone may register <u>here</u>. Upon registration,
 all telephone participants will receive a confirmation email detailing how to join the conference
 call, including the dial-in number along with a unique passcode and registrant ID that can
 be used to access the call. To access the webcast, please visit the Investors and Media section
 of Kiniksa's website. A replay of the event will also be available on Kiniksa's
 website within approximately 48 hours after the event.

**About Kiniksa**

Kiniksa is a biopharmaceutical company dedicated to improving the lives of patients suffering from debilitating diseases by discovering, acquiring, developing, and commercializing novel therapies for diseases with unmet need, with a focus on cardiovascular indications. Kiniksa's portfolio of assets is based on strong biologic rationale or validated mechanisms and offers the potential for differentiation. For more information, please visit <u>www.kiniksa.com</u>.

**About ARCALYST**

ARCALYST is a weekly, subcutaneously injected recombinant dimeric fusion protein that blocks interleukin-1 alpha (IL-1α) and interleukin-1 beta (IL-1β) signaling. ARCALYST was discovered by Regeneron Pharmaceuticals, Inc. (Regeneron) and is approved by the U.S. Food and Drug Administration (FDA) for recurrent pericarditis, cryopyrin-associated periodic syndromes (CAPS), including Familial Cold Autoinflammatory Syndrome and Muckle-Wells Syndrome, and deficiency of IL-1 receptor antagonist (DIRA). The FDA granted Breakthrough Therapy designation to ARCALYST for the treatment of recurrent pericarditis in 2019 and Orphan Drug exclusivity to ARCALYST in 2021 for the treatment of recurrent pericarditis and reduction in risk of recurrence in adults and pediatric patients 12 years and older. The European Commission granted Orphan Drug Designation to ARCALYST for the treatment of idiopathic pericarditis in 2021.

**IMPORTANT SAFETY INFORMATION ABOUT ARCALYST**

&nbsp;&nbsp;&nbsp;&nbsp;· ARCALYST may affect your immune system and can lower
the ability of your immune system to fight infections. Serious infections, including life-threatening infections and death, have happened
in patients taking ARCALYST. If you have any signs of an infection, call your doctor right away. Treatment with ARCALYST should be stopped
if you get a serious infection. You should not begin treatment with ARCALYST if you have an infection or have infections that keep coming
back (chronic infection).

&nbsp;&nbsp;&nbsp;&nbsp;· While taking ARCALYST, do not take other medicines
that block interleukin-1, such as Kineret<sup>®</sup> (anakinra), or medicines that block tumor necrosis factor, such as Enbrel<sup>®</sup>
(etanercept), Humira<sup>®</sup> (adalimumab), or Remicade<sup>®</sup> (infliximab), as this may increase your risk of getting
a serious infection.

&nbsp;&nbsp;&nbsp;&nbsp;· Talk with your doctor about your vaccine history.
Ask your doctor whether you should receive any vaccines before you begin treatment with ARCALYST.

&nbsp;&nbsp;&nbsp;&nbsp;· Medicines that affect the immune system may increase
the risk of getting cancer.

&nbsp;&nbsp;&nbsp;&nbsp;· Stop taking ARCALYST and call your doctor or get
emergency care right away if you have any symptoms of an allergic reaction.

&nbsp;&nbsp;&nbsp;&nbsp;· Your doctor will do blood tests to check for changes
in your blood cholesterol and triglycerides.

&nbsp;&nbsp;&nbsp;&nbsp;· Common side effects include injection-site reactions
(which may include pain, redness, swelling, itching, bruising, lumps, inflammation, skin rash, blisters, warmth, and bleeding at the injection
site), upper respiratory tract infections, joint and muscle aches, rash, ear infection, sore throat, and runny nose.

**For more information about ARCALYST, talk to your doctor and see the <u>Product Information</u>.**

**About KPL-387**

KPL-387 is an independently developed, investigational, fully human immunoglobulin G2 (IgG2) monoclonal antibody that binds human interleukin-1 receptor 1 (IL-1R1), inhibiting the signaling of the cytokines IL-1α and IL-1β. Kiniksa believes KPL-387 could expand the treatment options for recurrent pericarditis patients by enabling dosing with a single monthly SC injection in a liquid formulation.

**About KPL-1161**

KPL-1161 is an independently developed, investigational, Fc-modified IgG2 monoclonal antibody that binds IL-1R1, inhibiting the signaling of the cytokines IL-1α and IL-1β, with a target profile of quarterly SC dosing. Kiniksa is currently engaging in IND-enabling development activities for KPL-1161.

**Forward-Looking Statements**

This press release contains forward-looking statements. In some cases, you can identify forward looking statements by terms such as "may," "will," "should," "expect," "plan," "anticipate," "could," "intend," "target," "project," "contemplate," "believe," "estimate," "predict," "potential" or "continue" or the negative of these terms or other similar expressions, although not all forward-looking statements contain these identifying words. All statements contained in this press release that do not relate to matters of historical fact should be considered forward-looking statements, including without limitation, statements regarding: our expectation that ARCALYST 2025 net product revenue will increase to between $625 million and $640 million; our expectation to have data from the Phase 2 dose-focusing portion of our clinical trial of KPL-387 in recurrent pericarditis in the second half of 2026, and our plan to initiate the pivotal portion of the trial thereafter; our expectation to have potential market entry of KPL-387 in 2028 or 2029; our expectation that our current operating plan will remain cash flow positive on an annual basis; our target profile of monthly dosing via a single subcutaneous injection in a liquid formulation for KPL-387; our target profile of quarterly dosing for KPL-1161; our beliefs about the mechanisms of our assets and potential impact of their approach; and our belief that our portfolio of assets offers the potential for differentiation.

These forward-looking statements are based on management's current expectations. These statements are neither promises nor guarantees, but involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements, including without limitation, the following: delays or difficulty in enrollment of patients in, and activation or continuation of sites for, our clinical trials; delays or difficulty in completing our clinical trials as originally designed; potential for changes between final data and any preliminary, interim, top-line or other data from clinical trials; our inability to replicate results from our earlier clinical trials or studies; impact of additional data from us or other companies, including the potential for our data to produce negative, inconclusive or commercially uncompetitive results; potential undesirable side effects caused by our products and product candidates; our inability to demonstrate safety and efficacy to the satisfaction of applicable regulatory authorities; potential for applicable regulatory authorities to not accept our filings, delay or deny approval of any of our product candidates or require additional data or trials to support approval; our reliance on third parties as the sole source of supply of the drug substance and drug product used in our products and product candidates; raw material, important ancillary product and drug substance and/or drug product shortages; our reliance on third parties to conduct research, clinical trials, and/or certain regulatory activities for our product candidates; complications in coordinating requirements, regulations and guidelines of regulatory authorities across jurisdictions for our clinical trials; business development activities and their impact on our financial performance and strategy; changes in our operating plan, business development strategy or funding requirements; existing or new competition; current and future healthcare reforms, including those affecting the delivery of or payment for healthcare products and services; and the impact of global economic policy, including any uncertainty in national and international markets.

These and other important factors discussed in our filings with the U.S. Securities and Exchange Commission, including under the caption "Risk Factors" contained therein, could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. Any such forward-looking statements represent management's estimates as of the date of this press release. Except as required by law, we disclaim any intention or obligation to update or revise any forward-looking statements. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release.

ARCALYST<sup>®</sup> is a registered trademark of Regeneron Pharmaceuticals, Inc.

***Every Second Counts! <sup>®</sup>***

**Kiniksa Investor & Media Contact**

Jonathan Kirshenbaum

(781) 829-3949

jkirshenbaum@kiniksa.com

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| |
|:---|
| **KINIKSA PHARMACEUTICALS INTERNATIONAL, PLC** |
| **CONSOLIDATED STATEMENTS OF OPERATIONS** |
| **(In thousands, except share and per share amounts)** |
| **(Unaudited)** |

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| | | | | |
|:---|:---|:---|:---|:---|
|  | **Three Months Ended** | **Three Months Ended** | **Six Months Ended** | **Six Months Ended** |
|  | **June 30,** | **June 30,** | **June 30,** | **June 30,** |
|  | **2025** | **2024** | **2025** | **2024** |
| Revenue: |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Product revenue, net | $156797 | $103394 | $294582 | $182279 |
| &nbsp;&nbsp;&nbsp;License and collaboration revenue |  | 5237 |  | 6210 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total revenue | 156797 | 108631 | 294582 | 188489 |
| Operating expenses: |  |  |  |  |
| &nbsp;&nbsp;&nbsp;Cost of goods sold | 18603 | 12322 | 36471 | 22905 |
| &nbsp;&nbsp;&nbsp;Collaboration expenses | 52418 | 30014 | 96208 | 50815 |
| &nbsp;&nbsp;&nbsp;Research and development | 18753 | 24017 | 38078 | 50351 |
| &nbsp;&nbsp;&nbsp;Selling, general and administrative | 46863 | 42395 | 90393 | 81077 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total operating expenses | 136637 | 108748 | 261150 | 205148 |
| Income (loss) from operations | 20160 | (117) | 33432 | (16659) |
| Other income | 2717 | 2421 | 5010 | 4687 |
| Income (loss) before income taxes | 22877 | 2304 | 38442 | (11972) |
| Provision for income taxes | (5045) | (6212) | (12071) | (9640) |
| Net income (loss) | $17832 | $(3908) | $26371 | $(21612) |
| Net income (loss) per share attributable to ordinary shareholders—basic | $0.24 | $(0.06) | $0.36 | $(0.31) |
| Net income (loss) per share attributable to ordinary shareholders—diluted | $0.23 | $(0.06) | $0.34 | $(0.31) |
| Weighted average ordinary shares outstanding—basic | 73438530 | 71004640 | 73041920 | 70818831 |
| Weighted average ordinary shares outstanding—diluted | 77942082 | 71004640 | 76984393 | 70818831 |

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| |
|:---|
| **KINIKSA PHARMACEUTICALS INTERNATIONAL, PLC** |
| **SELECTED CONSOLIDATED BALANCE SHEET DATA** |
| **(In thousands)** |
| **(Unaudited)** |

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| | | |
|:---|:---|:---|
|  | **As of** | **As of** |
|  | **June 30,**<br>**2025** | **December 31,**<br>**2024** |
| Cash, cash equivalents, and short-term investments | $307782 | $243627 |
| Working capital | 302484 | 231178 |
| Total assets | 661150 | 580553 |
| Accumulated deficit | (494772) | (521143) |
| Total shareholders' equity | 495007 | 438436 |

---