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Form 8-K

sec.gov

8-K — Spyre Therapeutics, Inc.

Accession: 0001628280-26-024831

Filed: 2026-04-13

Period: 2026-04-13

CIK: 0001636282

SIC: 2834 (PHARMACEUTICAL PREPARATIONS)

Item: Regulation FD Disclosure

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — syre-20260413.htm (Primary)

EX-99.1 (exhibit991-8xkdatarelease.htm)

EX-99.2 (exhibit992set2.htm)

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8-K

8-K (Primary)

Filename: syre-20260413.htm · Sequence: 1

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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): April 13, 2026

_______________________________________________________

SPYRE THERAPEUTICS, INC.

(Exact name of Registrant as Specified in Its Charter)

_______________________________________________________

Delaware 001-37722 46-4312787

(State or Other Jurisdiction

of Incorporation) (Commission File Number) (IRS Employer

Identification No.)

221 Crescent Street

Building 23

Suite 105

Waltham, MA

02453

(Address of Principal Executive Offices)   (Zip Code)

Registrant’s Telephone Number, Including Area Code: 617 651-5940

Not Applicable

(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:

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

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

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

o 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

Symbol(s) Name of each exchange on which registered

Common Stock, $0.0001 Par Value Per Share

SYRE

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 o

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. o

Item 7.01 Regulation FD Disclosure.

SPY001 SKYLINE Part A Induction Topline Results

On April 13, 2026, Spyre Therapeutics, Inc. (“Spyre” or the “Company”) issued a press release announcing positive initial 12-week induction topline data from Part A of the Phase 2 SKYLINE trial of SPY001 for the treatment of moderate-to-severely active ulcerative colitis (“UC”). The Company will host a conference call and webcast today, Monday, April 13, 2026 at 8:00 a.m., Eastern Time, to discuss the topline data from Part A of the Phase 2 SKYLINE trial of SPY001.

A copy of the press release and data presentation that will be referenced on the call are attached hereto as Exhibit 99.1 and Exhibit 99.2, respectively. The information in this Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1 and Exhibit 99.2 attached hereto, is intended to be furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or under the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 8.01 Other Events.

On April 13, 2026, the Company announced positive initial 12-week induction topline data from Part A of the Phase 2 SKYLINE trial of SPY001 for the treatment of moderate-to-severely active UC. Additionally, the Company announced that recruitment for Part A of the SKYLINE Trial is now closed and enrollment is open for Part B, which includes three monotherapy cohorts (SPY001, SPY002, and SPY003) and three combination cohorts (SPY120, SPY130, and SPY230) into which participants may be randomized versus a shared placebo. Proof-of-concept induction data for the remaining cohorts of Part A are now expected mid-2026 (SPY002) and Q3 2026 (SPY003). Part B induction data (all cohorts) remain on track for 2027.

SPY001 SKYLINE Part A Induction Topline Results

Initial 12-week findings from SKYLINE Part A demonstrated that SPY001 met or exceeded all key objectives.

Efficacy: SPY001 achieved the primary endpoint, demonstrating a statistically significant reduction in the Robarts Histopathology Index (“RHI”) score of 9.2 points (p<0.0001). Rates of key secondary endpoints of clinical remission and endoscopic improvement were clinically meaningful.

Endpoint

Week 12 Result

Change in RHI from baseline

Primary endpoint

-9.2

(p<0.0001)

Clinical remission rate

40%

Endoscopic improvement rate

51%

Change in Modified Mayo Score

-3.7

Safety: SPY001 was well tolerated with a safety profile consistent with the α4β7 class. There were six subjects with treatment-emergent adverse events during the induction treatment period, with one serious adverse

event (“SAE”), deemed not drug-related. The most common adverse event (“AE”) (occurring in ≥ 2 patients) was back pain (n=2).

SPY001 (n=43)

Subjects with any AE (n, %)

6 (14%)

Severe (Grade ≥ 3) AE

1 (2%)*

Drug-related AE

0

AE leading to study discontinuation

0

SAE

1 (2%)*

Drug-related SAE

0

AEs of special interest

0

Death

0

*Chest pain in a 68-year-old male with history of coronary artery disease and angina on nitroglycerin prn, type 2 diabetes mellitus, hypertension, and hypercholesterolemia who presented with chest pain and was ruled out for a myocardial infarction

Forward-Looking Statements

Certain statements in this Current Report on Form 8-K, other than purely historical information, may constitute “forward-looking statements” within the meaning of the federal securities laws, including for purposes of the safe harbor provisions under the United States Private Securities Litigation Reform Act of 1995. These statements include, but are not limited to, statements regarding: the Company’s ongoing and future clinical development activities, including Spyre’s plans for and timing of cohort initiation and data readouts for the ongoing SKYLINE trial and ongoing SKYWAY trial and enrollment of clinical trials; the inclusion of each rational combination in Part B of the SKYLINE Phase 2 platform trial; and Spyre’s business plans, milestones, strategy and goals. The words “opportunity,” “potential,” “milestones,” “pipeline,” “strategy,” “anticipate,” “believe,” “could,” “estimate,” “expect,” “may,” “might,” “plan,” “possible,” “predict,” “should,” “will,” “would,” and similar expressions (including the negatives of these terms) may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond the Company’s control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to, uncertainties and risks arising from regulatory feedback, including potential disagreement by regulatory authorities with the Company’s interpretation of data and the Company’s clinical trials for its product candidates; the potential for interim data not being delivered within expected time frames or final data not being consistent with or different than the interim data reported for our programs; the potential impact of Trump Administration policies and changes in law on our business; and those uncertainties and factors described in Spyre's most recent Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission (“SEC”), as well as discussions of potential risks, uncertainties, and other important factors included in the Company’s other filings it makes with the SEC from time to time. Should one or more of these risks or uncertainties materialize, or should any of the Company’s assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. Nothing in this Current Report on Form 8-K should be regarded as a representation by any person that the forward-looking statements set forth therein will be achieved or that any of the contemplated results of such forward-looking statements will be achieved. You should not place undue reliance on forward-looking statements in this Current Report on Form 8-K, which speak only as of the date they are made and are qualified in their entirety by reference to the cautionary statements herein. The Company does not undertake or accept any duty to make any updates or revisions to any forward-looking statements. This Current Report on Form 8-K does not purport to summarize all of the conditions, risks and other attributes of an investment in the Company.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit Number

Description

99.1

Press release issued by Spyre Therapeutics, Inc. regarding Data, dated April 13, 2026.

99.2

Spyre Therapeutics, Inc. Data Presentation, dated April 13, 2026.

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.

SPYRE THERAPEUTICS, INC.

Date:

April 13, 2026

By:

/s/ Cameron Turtle

Cameron Turtle

Chief Executive Officer

EX-99.1

EX-99.1

Filename: exhibit991-8xkdatarelease.htm · Sequence: 2

Document

Exhibit 99.1

Spyre Announces Potential Best-in-Class SPY001 Part A Induction Results from SKYLINE Trial in Moderate-to-Severe Ulcerative Colitis Patients

SPY001 met its primary endpoint with a statistically significant reduction of 9.2 points (p<0.0001) from baseline at Week 12 in Robart’s Histopathology Index (RHI) score

Secondary endpoints included clinical remission by modified Mayo Score of 40% and endoscopic improvement of 51%

SPY001 was well tolerated with a safety profile consistent with the α4β7 class

Recruitment for SKYLINE Part A closed, now enrolling Part B monotherapy and combination cohorts

Management will host a conference call today at 8:00 a.m. ET

WALTHAM, Mass., April 13, 2026 (GLOBE NEWSWIRE) – Spyre Therapeutics, Inc. (NASDAQ: SYRE), a clinical-stage biotechnology company pioneering long-acting antibodies and antibody combinations to redefine the standard of care for inflammatory bowel disease (IBD) and rheumatic diseases, today announced positive 12-week induction data from Part A of the Phase 2 SKYLINE trial of SPY001, a potential best-in-class anti-α4β7 being investigated for the treatment of moderate-to-severely active ulcerative colitis (UC).

“SPY001 was designed to improve upon vedolizumab’s proven activity in IBD by matching its epitope and potency while increasing target coverage through an extended half-life and greater induction dosing. Our data today support the hypothesis that this approach could lead to a best-in-class anti-α4β7 product across safety, efficacy, and convenience,” said Deanna Nguyen, M.D., SVP of Clinical Development and SKYLINE study lead. “Beyond SPY001’s potential as a monotherapy, we continue to believe that its gut-selective mechanism makes it an ideal backbone for combination therapy alongside our cytokine-targeting investigational antibodies SPY002 (anti-TL1A) or SPY003 (anti-IL23). We have begun enrolling these combinations globally and look forward to unveiling proof-of-concept data next year.”

Additionally, Spyre announced today that recruitment for Part A of SKYLINE is now closed and enrollment is open for Part B, which includes three monotherapy cohorts (SPY001, SPY002, and SPY003) and three combination cohorts (SPY120, SPY130, and SPY230) into which participants may be randomized versus a shared placebo. Proof-of-concept induction data for the remaining cohorts of Part A are now expected mid-2026 (SPY002) and Q3 2026 (SPY003). Part B induction data (all cohorts) remain on track for 2027.

1

“On behalf of the Spyre team, I’d like to thank the patients and investigators whose partnership has made this progress possible as we advance the study with the goal of delivering paradigm-changing combinations for IBD patients,” said Sheldon Sloan, M.D. MBE, Chief Medical Officer of Spyre Therapeutics. “Thanks to our team’s outstanding execution, we enrolled Part A with exceptional speed and now transition to Part B. We expect heightened investigator enthusiasm given these promising results for SPY001, a low placebo allocation for the remainder of the trial, and a unique opportunity to evaluate perhaps the three most promising combinations in development.”

SPY001 SKYLINE Part A Induction Topline Results

SKYLINE is a two-part induction and maintenance platform trial of SPY001, SPY002, SPY003, as well as pairwise combinations thereof (six investigational agents total) in patients with moderately to severely active ulcerative colitis. Part A is an open-label assessment of the safety and efficacy of a single dose level of each investigational monotherapy, and Part B is a randomized and placebo-controlled assessment of the safety and efficacy of investigational monotherapies (two dose levels) and combinations.

SPY001 is an extended half-life investigational antibody targeting α4β7, an integrin central to immune cell trafficking to the gut. Initial 12-week findings from SKYLINE Part A demonstrated that SPY001 met or exceeded all key objectives.

Efficacy: SPY001 achieved the primary endpoint, demonstrating a statistically significant reduction in the RHI score of 9.2 points (p<0.0001). Rates of key secondary endpoints of clinical remission and endoscopic improvement were clinically meaningful and support SPY001’s potential best-in-class profile.

Endpoint

Week 12 Result

Change in RHI from baseline

Primary endpoint

-9.2

(p<0.0001)

Clinical remission rate

40%

Endoscopic improvement rate

51%

Change in Modified Mayo Score

-3.7

Safety: SPY001 was well tolerated with a safety profile consistent with the α4β7 class. There were six subjects with treatment-emergent adverse events (TEAEs) during the induction treatment period, with one serious adverse event (SAE), deemed not drug-related. The most common AE (occurring in ≥ 2 patients) was back pain (n=2).

2

SPY001 (n=43)

Subjects with any AE (n, %)

6 (14%)

Severe (Grade ≥ 3) AE

1 (2%)*

Drug-related AE

0

AE leading to study discontinuation

0

SAE

1 (2%)*

Drug-related SAE

0

AEs of special interest

0

Death

0

*Chest pain in a 68-year-old male with history of coronary artery disease and angina on nitroglycerin prn, type 2 diabetes mellitus, hypertension, and hypercholesterolemia who presented with chest pain and ruled out for a myocardial infarction

Webcast Details

Spyre Therapeutics’ webcast of the SPY001 Phase 2 SKYLINE Part A data will begin today at 8:00 a.m. ET. The webcast can be accessed via this link or the Investors section of the Company’s website at https://ir.spyre.com/news-events/events. A replay of the webcast will be available following the call.

About Spyre Therapeutics

Spyre Therapeutics is a clinical-stage biotechnology company pioneering long-acting antibodies and antibody combinations to redefine the standard of care for inflammatory bowel disease (“IBD”) and rheumatic diseases. Spyre's pipeline includes investigational extended half-life antibodies targeting α4β7, TL1A, and IL-23.

For more information, visit Spyre's website at www.spyre.com.

Forward-Looking Statements

Certain statements in this press release, other than purely historical information, may constitute "forward-looking statements" within the meaning of the federal securities laws, including for purposes of the safe harbor provisions under the United States Private Securities Litigation Reform Act of 1995. These statements include, but are not limited to, statements regarding: Spyre’s ability to achieve the expected benefits or opportunities with respect to its product candidates, including their potential commercialization; Spyre’s ongoing and future clinical development activities, including Spyre’s plans for and timing of cohort initiation and data readouts for the ongoing SKYLINE trial and ongoing SKYWAY trial and enrollment of clinical trials; the inclusion of each rational combination in Part B of the SKYLINE Phase 2 platform trial; expectations regarding investigator enthusiasm and placebo allocation; the potential for SPY001 to be an ideal backbone for combination therapy; the potential therapeutic benefits of Spyre’s product candidates as monotherapies or in combinations, including potency, convenience, durability, and dosing profile, and their extended half-life;

3

potential growth opportunities; and Spyre’s business plans, milestones, strategy and goals. The words "opportunity," "potential," "milestones," "pipeline," "strategy," "anticipate," "believe," "could," "estimate," "expect," "may," "might," "plan," "possible," "predict," "should," "will," "would," and similar expressions (including the negatives of these terms) may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. These forward-looking statements are based on current expectations and beliefs and involve a number of risks and uncertainties, many of which are beyond Spyre’s control, and other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to, uncertainties and risks arising from regulatory feedback, including potential disagreement by regulatory authorities with the Company’s interpretation of data and the Company’s clinical trials for its product candidates; the potential for interim data not being delivered within expected time frames or final data not being consistent with or different than the interim data reported for our programs; the potential impact of Trump Administration policies and changes in law on our business; and those uncertainties and factors described in Spyre's most recent Annual Report on Form 10-K, as supplemented and updated by subsequent Quarterly Reports on Form 10-Q and any other filings that Spyre has made or may make with the SEC from time to time. You should not place undue reliance on forward-looking statements in this press release, which speak only as of the date they are made and are qualified in their entirety by reference to the cautionary statements herein. Spyre does not undertake or accept any duty to make any updates or revisions to any forward-looking statements.

For Investors:

Eric McIntyre, Spyre Therapeutics

SVP of Finance and Investor Relations

Eric.mcintyre@spyre.com

For Media:

Josie Butler, 1AB

josie@1abmedia.com

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Apr. 13, 2026

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Indicate if registrant meets the emerging growth company criteria.

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-Name Exchange Act

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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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No definition available.

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- Definition

Two-character EDGAR code representing the state or country of incorporation.

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No definition available.

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The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

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The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

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Local phone number for entity.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

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-Number 240

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

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Title of a 12(b) registered security.

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Name of the Exchange on which a security is registered.

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-Number 240

-Section 12

-Subsection d1-1

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

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Trading symbol of an instrument as listed on an exchange.

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- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

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