# EDGAR Filing Document

**Accession Number:** 0001636282
**File Stem:** 0001193125-26-009894
**Filing Date:** 2026-1
**Character Count:** 51148
**Document Hash:** 4dc98f43aafee0a500550f02068bbb89
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-009894.hdr.sgml**: 20260112

**ACCESSION NUMBER**: 0001193125-26-009894

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 53

**CONFORMED PERIOD OF REPORT**: 20260112

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260112

**DATE AS OF CHANGE**: 20260112

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Spyre Therapeutics, Inc.
- **CENTRAL INDEX KEY:** 0001636282
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 464312787
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-37722
- **FILM NUMBER:** 26524890

**BUSINESS ADDRESS:**
- **STREET 1:** 221 CRESCENT STREET
- **STREET 2:** BUILDING 23, SUITE 105
- **CITY:** WALTHAM
- **STATE:** MA
- **ZIP:** 02453
- **BUSINESS PHONE:** 6176515940

**MAIL ADDRESS:**
- **STREET 1:** 221 CRESCENT STREET
- **STREET 2:** BUILDING 23, SUITE 105
- **CITY:** WALTHAM
- **STATE:** MA
- **ZIP:** 02453

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Aeglea BioTherapeutics, Inc.
- **DATE OF NAME CHANGE:** 20150311

?xml version='1.0' encoding='ASCII'? 8-K

### 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): January 12, 2026

## SPYRE THERAPEUTICS, INC.

#### (Exact name of Registrant as Specified in Its Charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-37722** | **46-4312787** |
| **(State or Other Jurisdiction**<br> **of Incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer**<br> **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:

☐ 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<br>on which registered** |
| Common Stock, $0.0001 Par Value Per Share | SYRE | The Nasdaq Stock Market LLC<br> (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. ☐

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---

| | |
|:---|:---|
| **Item 7.01** | **Regulation FD Disclosure.**  |

---

On January 12, 2026, Spyre Therapeutics, Inc. (the "Company") issued a press release (the "Press Release") and posted an updated corporate presentation (the "Corporate Presentation") on its website. The Press Release and the Corporate Presentation include, without limitation, updates on the Company's ongoing clinical trials and the appointment of Kate Tansey Chevlen as Chief Commercial Officer. Copies of the Press Release and Corporate Presentation are attached as Exhibit 99.1 and Exhibit 99.2, respectively, to this Current Report on Form 8-K and are incorporated herein by reference.

The information in this Item 7.01 of this Current Report on Form 8-K, including Exhibits 99.1 and 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 9.01** | **Financial Statements and Exhibits.**  |

---

(d) Exhibits

---

| | |
|:---|:---|
| Exhibit<br>Number | Description |
| 99.1 | [Press Release of the Company, dated January 12, 2026](d28401dex991.htm) |
| 99.2 | [Corporate Presentation (January 2026)](d28401dex992.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

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#### 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: January 12, 2026 | By: | /s/ Cameron Turtle |
|  |  | Cameron Turtle |
|  |  | Chief Executive Officer |

---

## Exhibit 99.1

**Exhibit 99.1**![LOGO](g28401g0109152426648.jpg)

**Spyre Therapeutics Poised for Transformational 2026 With Six Expected Proof-of-** 

**Concept Readouts Beginning in Q2** 

*"6 in '26" expected proof-of-concept (POC) readouts across SKYLINE and SKYWAY trials* 

*SKYLINE platform trial in ulcerative colitis (UC) recruiting faster than expected with* 

*SPY001 enrollment complete ahead of schedule; Part A readouts accelerated, now* 

*expected to start in Q2* 

*SKYWAY basket trial enrollment on track across rheumatoid arthritis (RA), psoriatic* 

*arthritis (PsA), and axial spondyloarthritis (axSpA); All readouts expected in 4Q 2026* 

*Kate Tansey Chevlen appointed Chief Commercial Officer (CCO)* 

*Strong balance sheet with pro forma cash, cash equivalents, and marketable securities* 

*balance of $783M as of September 30, 2025\*, anticipated to provide cash runway into* 

*the second half of 2028* 

WALTHAM, Mass., January 12, 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 highlighted its 2026 priorities including six expected POC readouts (three from the SKYLINE platform trial in UC and three from the SKYWAY basket trial in RA, PsA, and axSpA). The Company also expanded its leadership team with the appointment of Kate Tansey Chevlen as CCO. Ms. Tansey Chevlen is a seasoned biopharma commercial leader with nearly two decades of experience driving strategy, execution, and growth across U.S. and global markets at Amgen.

"Our six expected readouts this year have the potential to identify products, delivered as monotherapies or as combinations, that meaningfully improve upon the standard-of-care for patients suffering from IBD and rheumatic diseases," said Cameron Turtle, DPhil, CEO of Spyre. "As we plan to initiate late-stage development in 2027, we are excited to welcome Kate as our new CCO. Kate's experience securing access and driving product uptake will be invaluable as we shape our Phase 3 strategy to unlock the full value of our pipeline."

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**Updated topline guidance for SKYLINE and SKYWAY trials** 

SKYLINE (NCT07012395) is a Phase 2 platform trial of SPY001 (anti-α4ß7), SPY002 (anti-TL1A), SPY003 (anti-IL-23), and pairwise combinations thereof (six investigational long-acting agents in total) in patients with moderately to severely active ulcerative colitis. The trial consists of two parts: Part A is an open-label assessment of the safety and preliminary efficacy of monotherapies and Part B is a randomized and placebo-controlled assessment of the safety and efficacy of monotherapies and combinations. Enrollment in Part A has exceeded expectations with SPY001 enrollment completed ahead of schedule. Readouts for Part A are now expected to begin in Q2.

SKYWAY (NCT07148414) is a Phase 2 basket trial of SPY072 (anti-TL1A) in patients with moderate to severely active RA, PsA, or axSpA. Enrollment is on track, and all indications are expected to readout in 4Q 2026.

---

| | | | |
|:---|:---|:---|:---|
| **Trial** | **Arm** | **Status** | **Anticipated milestones** |
| **SKYLINE**<br> Platform study | SPY001 UC Part A | Enrollment complete | Readouts beginning<br> **Q2** |
| **SKYLINE**<br> Platform study | SPY002 UC Part A | Enrolling | Readouts beginning<br> **Q2** |
| **SKYLINE**<br> Platform study | SPY003 UC Part A | Enrolling | Readouts beginning<br> **Q2** |
| **SKYWAY**<br> Basket study | SPY072 RA | Enrolling | All readouts<br> **4Q 2026** |
| **SKYWAY**<br> Basket study | SPY072 PsA | Enrolling | All readouts<br> **4Q 2026** |
| **SKYWAY**<br> Basket study | SPY072 axSpA | Enrolling | All readouts<br> **4Q 2026** |

---

**Appointment of Chief Commercial Officer** 

Ms. Tansey Chevlen joins Spyre from Amgen where she most recently held the position of VP, Global Marketing Head for Immunology and Inflammation. During her time at Amgen, she has held senior leadership roles across marketing, sales, and market access, and has played a pivotal role in multiple successful product launches. Ms. Tansey Chevlen has been instrumental in shaping as well as implementing go-to-market

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and patient access strategies, and partnering closely with cross-functional teams to translate scientific innovation into meaningful commercial impact. Ms. Tansey Chevlen holds a BA in Politics from Brandeis University and an MBA from the Johnson Graduate School of Management at Cornell University.

"Spyre has one of the most compelling portfolios and development strategies in the autoimmune market, with multiple opportunities to deliver breakthrough medicines for patients in markets currently totaling more than $60B of annual revenue," said Ms. Tansey Chevlen. "I am thrilled to join Spyre at this critical juncture as we deliver proof-of-concept data and prepare to execute pivotal trials and commercialize highly differentiated products."

*\* Pro forma cash includes cash, cash equivalents, and marketable securities as of September 30, 2025 of $486.2 million plus $296.5 million in net proceeds from the October 2025 underwritten public offering of common stock.* 

**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 α4ß7, TL1A, and IL-23.

For more information, please visit http://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 the expected timing and results of the ongoing SKYWAY Phase 2 basket trial and SKYLINE Phase 2 platform trial, including timing and number of data readouts expected to be delivered; the potential therapeutic benefits of Spyre's product candidates as monotherapies or in combinations and their extended half-life; estimated market sizes

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and potential growth opportunities; expectations of cash runway extending into the second half of 2028; 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, 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

SVP of Finance and Investor Relations

Spyre Therapeutics

Eric.mcintyre@spyre.com

**For Media:**

Josie Butler, 1AB

josie@1abmedia.com

## Exhibit 99.2

![](g28401ex99_2p1g1.jpg)

Exhibit 99.2 CORPORATE OVERVIEW January 2026

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![](g28401ex99_2p2g1.jpg)

Disclosures The information contained in this presentation has been prepared by Spyre Therapeutics, Inc. and its affiliates ("Spyre" or the "Company") and contains information pertaining to the business and operations of the Company. The information contained in this presentation: (a) is provided as at the date hereof, is subject to change without notice, and is based on publicly available information, internally developed data as well as third party information from other sources; (b) does not purport to contain all the information that may be necessary or desirable to fully and accurately evaluate an investment in the Company; (c) is not to be considered as a recommendation by the Company that any person make an investment in the Company; (d) is for information purposes only and shall not constitute an offer to buy, sell, issue or subscribe for, or the solicitation of an offer to buy, sell or issue, or subscribe for any securities of the Company in any jurisdiction in which such offer, solicitation or sale would be unlawful. Where any opinion or belief is expressed in this presentation, it is based on certain assumptions and limitations and is an expression of present opinion or belief only. This presentation should not be construed as legal, financial or tax advice to any individual, as each individual's circumstances are different. This document is for informational purposes only and should not be considered a solicitation or recommendation to purchase, sell or hold a security. Forward-Looking Information Certain information set forth in this presentation contains "forward-looking statements" within the meaning of applicable United States securities legislation. Except for statements of historical fact, certain information contained herein constitutes forward- looking statements which include but are not limited to statements regarding: our business strategy, including our ability to develop best-in-class and first-in-class therapeutics for inflammatory bowel disease (IBD), rheumatoid arthritis (RA), psoriatic arthritis (PsA), axial spondyloarthritis (axSpA) and other immune-mediated diseases that meaningfully improve both efficacy and convenience compared to today's standard of care; our ability to achieve the expected benefits or opportunities with respect to our product candidates, including their potential commercialization; the potential consistency of the SPY001, SPY002, SPY072 and SPY003 Phase 1 trial final data readouts with previously disclosed data for our programs; the efficacy, safety profile, dosing regime, convenience, commercial viability and tolerability of SPY001, SPY002, SPY072 and SPY003, including combinations thereof; Spyre's ongoing and future clinical development activities, including the plans for and timing of cohort initiation and data readouts for the ongoing SKYWAY Phase 2 basket trial and SKYLINE Phase 2 platform trial, enrollment of clinical trials and number of data readouts expected to be delivered in 2026 and 2027; our ability to provide anticipated readouts ahead of any disclosed bispecific approaches against our targets; the induction and maintenance dosing regimen for SPY001 and our other product candidates and combinations thereof, including the potential for a Q3M-Q6M dosing profile; the potential therapeutic benefits of our product candidates as monotherapies or in combinations and their extended half-life, including the expected duration of half-life in comparison to competitor products; potential alignment with regulatory authorities and anticipated regulatory submissions; expected timing for regulatory feedback; estimated market sizes and potential growth opportunities; the length of time that the Company believes its existing cash resources will fund its operations, including expectations of cash runway extending into the second half of 2028; and management's assessment of future plans and operations which are based on current internal expectations, estimates, projections, assumptions and beliefs, which may prove to be incorrect. Forward-looking statements can often be identified by the use of words such as "may", "will", "could", "would", "anticipate", 'believe", expect", "intend", "potential", "estimate", "scheduled", "plans", "", "forecasts", "goals" and similar expressions or the negatives thereof. Forward-looking statements are neither historical facts nor assurances of future performance. Forward-looking statements are based on a number of factors and assumptions made by management and considered reasonable at the time such information is provided, and forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause the actual results, performance or achievements to be materially different from those expressed or implied by the forward-looking statements, including uncertainties and risks arising from regulatory feedback, including potential disagreement by regulatory authorities with our clinical trial design, interpretation of data and our ongoing or clinical trials for our product candidates, including our plans for and timing of cohort initiation for combination therapy arms for the ongoing SKYLINE Phase 2 platform trial across different jurisdictions; the unpredictable relationship between preclinical study results and clinical study results; the potential for interim data not being delivered within expected time frames or final clinical data not being consistent with or different than the previously disclosed data for our programs; the expected or potential impact of macroeconomic conditions, including inflationary pressures, rising interest rates, general economic slowdown or a recession, changes in tariff/trade and monetary policy, volatile market conditions, financial institution instability, as well as geopolitical instability, including the ongoing military conflicts between Ukraine and Russia, conflicts in the Middle East, and geopolitical tensions between the United States and other countries, including China and Venezuela, on our operations; the implementation of changes in law, tariffs, sanctions, export or import controls, and other government measures that could impact our business operations, including restricting international trade by the United States, China or other countries and the BIOSECURE Act; the impacts of adverse events or disappointing results in clinical trials of third parties, including our competitors developing product candidates that target similar mechanisms of action and/or indications as our product candidates; and those uncertainties and factors described under the heading "Risk Factors," "Risk Factor Summary" and "Note about Forward-Looking Statements" in the Company's most recent Annual Report on Form 10-K, as supplemented and updated by subsequent Quarterly Reports on Form 10-Q and Current Reports on Form 8-K that the Company has filed or will file with the SEC, as well as discussions of potential risks, uncertainties, and other filings by the Company from time to time, as well as risk factors associated with companies that operate in the biopharma industry, including those associated with the uncertainties of drug development. All of the forward-looking statements made in this presentation are qualified by these cautionary statements and other cautionary statements or other factors contained herein. Although management believes that the expectations conveyed by forward-looking statements herein are reasonable based on information available on the date such forward-looking statements are made, there can be no assurance that forward looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. The Company undertakes no obligation to update forward-looking statements if circumstances or management's estimates or opinions should change except as required by applicable securities laws. The forward-looking statements contained herein are presented for the purposes of assisting readers in understanding the Company's plan, objectives and goals and may not be appropriate for other purposes. The reader is cautioned not to place undue reliance on forward-looking statements Industry Information This presentation also contains or references certain industry data that is based upon information from independent industry publications, market research, and surveys and other publicly available sources. Although the Company believes these sources to be generally reliable, such information is subject to interpretation and cannot be verified with complete certainty due to limits on the availability and reliability of data, the voluntary nature of the data gathering process and other inherent limitations and uncertainties. The Company has not independently verified any of the data from third party sources referred to in this presentation and accordingly, the Company makes no representation or warranty as to the origin, validity, accuracy, completeness, currency or reliability of the information in this presentation.© 2026 Spyre Therapeutics, Inc. 2 All rights reserved.

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![](g28401ex99_2p3g1.jpg)

Spyre is pioneering long-acting antibodies and combinations to redefine standard of care in IBD and rheumatic diseases Inflammatory bowel disease Rheumatic disease Potential Enable potential Potential best-in-class paradigm changing first-in-class & best-in class monotherapies combinations anti-TL1A α4β7 α4β7 + TL1A SPY001 SPY120 RA TL1A TL1A α4β7 + IL-23 SPY002 SPY130 SPY072 PsA axSpA IL-23 TL1A + IL-23 SPY003 SPY230 Target 2-4 doses per year Target 2-4 doses per year After loading doses After loading doses© 2026 Spyre Therapeutics, Inc. 3 All rights reserved.

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![](g28401ex99_2p4g1.jpg)

Two innovative trials provide six expected Ph2 readouts in '26 Trial Readout Anticipated Milestones α4β7 Readouts beginning expected POC SPY001 Ph2 POC in UC readouts TL1A SPY002 Ph2 POC in UC 6 Q2 IL-23 SPY003 Ph2 POC in UC in TL1A SPY072 Ph2 POC in RA TL1A SPY072 Ph2 POC in PsA Q4 TL1A SPY072 Ph2 POC in axSpA '26© 2026 Spyre Therapeutics, Inc. 4 POC=proof of concept; UC=ulcerative colitis; RA=rheumatoid arthritis; PsA=psoriatic arthritis; axSpA=axial spondyloarthritis All rights reserved.

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![](g28401ex99_2p5g1.jpg)

Advancing a robust I&I pipeline with exceptional financial strength Trial Indication Program Target Phase 1 Phase 2 Phase 3 Anticipated Milestones α4β7 UC SPY001 2026: Ph2 open-label POC Beginning in Q2 TL1A SPY002 2027: Ph2 pbo-controlled data IL-23 SPY003 α4β7 + TL1A SPY120 2027: Ph2 pbo-controlled data SPY130 α4β7 + IL-23 SPY230 TL1A + IL-23 RA PsA SPY072 Q4 2026: Ph2 POC TL1A axSpA 1 $783 million pro forma cash as of September 30, 2025 , with expected runway into 2H 2028 1© 2026 Spyre Therapeutics, Inc. Milestones expected as of the date of this presentation. Reflects cash, cash equivalents, & marketable securities as of 9/30/25 of $486.2 million plus $296.5 million in net proceeds from 5 All rights reserved. the October 2025 underwritten public offering of common stock; UC=ulcerative colitis; RA=rheumatoid arthritis; PsA=psoriatic arthritis; axSpA=axial spondyloarthritis; POC=proof of concept

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![](g28401ex99_2p6g1.jpg)

Next-generation antibodies designed to match or exceed the potency of first-generation molecules SPY001 (α4β7) potency SPY002 (TL1A) potency SPY003 (IL-23) potency 60 SPY001 SPY002 SPY003 100 50 100 80 Vedolizumab Tulisokibart Risankizumab 40 60 α4β7 TL1A IL-23 30 40 50 20 20 10 0 0 0 0.001 0.01 0.1 1 10 100 0.001 0.01 0.1 1 10 100 0.01 0.1 1 10 mAb Concentration (nM) mAb Concentration (nM) mAb Concentration (nM) Potential for comparable efficacy at similar or lower doses© 2026 Spyre Therapeutics, Inc. Data on file. Potency refers to in vitro potency: SPY001 assay reports inhibition of cells expressing a4b7 binding to MAdCAM-1. SPY002 assay reports inhibition of TL1A-induced apoptosis 6 All rights reserved. in TF-1 cells. SPY003 assay reports inhibition of cellular STAT3 signaling. Vedolizumab, tulisokibart, and risankizumab are synthesized comparator antibodies. %Inhibition Inhibition % % Inhibition

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![](g28401ex99_2p7g1.jpg)

Engineered to be long-acting via YTE modification YTE modification YTE-modified mAbs are returned to circulation for continued activity Antibodies are subject to YTE modification increases internal FcRn binding promotes recycling of degradation when internalized binding to FcRn, avoiding degradation mAbs to circulation YTE YTE FcRn© 2026 Spyre Therapeutics, Inc. 7 mAb=monoclonal antibody; FcRn=neonatal Fc receptor All rights reserved.

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![](g28401ex99_2p8g1.jpg)

Demonstrated half-life extension for potential quarterly or twice-annual dosing SPY001 human PK simulation SPY002 human PK simulation SPY003 human PK simulation SPY001 SPY003 SPY002 Vedolizumab Risankizumab Afimkibart Target Profiles 2-4 2-4 2-4 Doses per year Doses per year Doses per year After loading doses SPY001 PK simulation based on PK data as of 03/19/2025 cutoff; SPY002 PK simulation based on PK data from 5/31/2025 cutoff; SPY003 PK simulation based on PK data from© 2026 Spyre Therapeutics, Inc. 8 9/15/2025 cutoff. Vedolizumab, Afimkibart, and Risankizumab simulations based on published data (Rosario, M, et. al. (2015); Danese, Silvio, et al. (2024) Thakre, Neha et. al. (2024); no All rights reserved. head-to-head clinical trials have been conducted. Concept image of drug delivery device shown for illustrative purposes only.

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![](g28401ex99_2p9g1.jpg)

Potential paradigm-changing combination therapies in IBD Inflammatory bowel disease Rational combinations targeting diverse disease drivers TL1A SPY120 α4β7 IL-23 SPY130 α4β7 IL-23 IBD SPY230 TL1A Target 2-4 doses per year© 2026 Spyre Therapeutics, Inc. 9 Potential Q3M-Q6M maintenance dosing interval based on PK modeling. Concept image of drug delivery device shown for illustrative purposes only. All rights reserved.

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![](g28401ex99_2p10g1.jpg)

Potential first-in-class & best-in-class anti-TL1A in rheumatic diseases Rheumatic diseases Distinct anti-TL1A targeting quarterly or twice-annual dosing Rheumatoid arthritis Psoriatic arthritis RA Target 2-4 doses per year axSpA Axial spondyloarthritis SPY072 PsA© 2026 Spyre Therapeutics, Inc. 10 Potential Q3M-Q6M maintenance dosing interval based on PK modeling. All rights reserved.

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![](g28401ex99_2p11g1.jpg)

Spyre is uniquely positioned to enable superior product profiles in IBD and rheumatic diseases Inflammatory bowel disease Rheumatic disease Advancing potential best-in-class monotherapies Advancing potential first-in-class & best-in-class anti-TL1A Enabling potential paradigm changing combinations 80 80 1 1 $30B global market $30B global market 60 60 40 40 SPY120 • SPY130 • SPY230 Target profiles axSpA SPY072 PsA RA Target profile SPY001 • SPY002 • SPY003 20 20 IBD (UC and CD) Target profiles 2 Today's SOC 2 Today's SOC 0 1 2 3 4 5 6 0 1 2 3 4 5 6 Maintenance dosing interval (months) Maintenance dosing interval (months) Positioning of Spyre programs is illustrative and based on Phase 1 results and illustrates what we believe we can potentially achieve. Placebo-adjusted clinical remission data are derived© 2026 Spyre Therapeutics, Inc. 11 from different clinical trials conducted at different times, with differences in trial design and patient populations. As a result, cross-trial comparisons cannot be made, and no head-to-head All rights reserved. 1 2 clinical trials have been conducted. Evaluate Pharma 2028 Global Sales Forecast; Barclays Immunology Deep Dive (2023); Oral and SC administered advanced therapies. Pbo-adjusted clinical remission (%) Pbo-adjusted ACR50/ASAS40 (%)

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![](g28401ex99_2p12g1.jpg)

Ph2 trials ongoing in IBD and rheumatic diseases Ph2 platform trial evaluating SPY001, SPY002, SPY003 Ph2 basket trial evaluating SPY072 in rheumatoid and pairwise combinations in ulcerative colitis arthritis, psoriatic arthritis, and axial spondyloarthritis SPY072 high SPY001 RA UC SPY072 low SPY002 Placebo SPY003 SPY072 SPY120 PsA Placebo SPY130 SPY230 SPY072 axSpA Placebo Placebo Q2'26 4Q'26 6 1 1 3 READOUTS BEGINNING\* EXPECTED READOUTS INTERVENTIONS INDICATION INTERVENTION INDICATIONS© 2026 Spyre Therapeutics, Inc. 12 \*Part A open-label monotherapy readouts beginning in Q2 2026. All rights reserved. Combos Monos

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![](g28401ex99_2p13g1.jpg)

Inflammatory bowel disease

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![](g28401ex99_2p14g1.jpg)

Substantial unmet need remains for the millions of individuals living with IBD 1 • ~2.4M individuals in the U.S. are diagnosed with IBD (~1.3M UC and ~1.0M CD) • Substantial unmet need remains due to: – Minority remission rates and lack of durability with existing therapies – Side effects and safety concerns associated with certain treatments – Poor adherence to frequent and/or inconvenient dosing regimens UC placebo-adjusted clinical remission rates by MOA (Induction) 100 80 60 40 20 0 Anti-TNF Anti-integrin Anti-IL-12/23 / Anti-IL-23 S1P inhibitor JAK inhibitor© 2026 Spyre Therapeutics, Inc. 1 14 Lewis, James D., et al. Gastroenterology (2023). Estimate includes patients identified with indeterminate IBD. Clinical remission rates from product labels. All rights reserved.

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JNJ's VEGA study demonstrated the power of combination therapy to break the efficacy ceiling in IBD VEGA combination study • Ulcerative colitis ~Additive absolute W12 mMS clinical remission rates Δ+22% 47% 22% 25% 24% 25% Anti-TNF Anti-IL-23 Combination (Golimumab) (Guselkumab)© 2026 Spyre Therapeutics, Inc. 15 Feagan, B. G. et al. Lancet Gastroenterol. Hepatol. 8, 307–320 (2023). mMS=modified mayo score All rights reserved.

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Replacing anti-TNF with anti-α4β7 or anti-TL1A may yield combinations with improved safety and efficacy anti-α4β7 was superior to anti-TNF in H2H UC study anti-TL1A exceeds anti-TNF on cross-trial comparison TNF TNF Absolute clinical remission – week 52 (VARSITY) Pbo-adjusted clinical remission - induction α4β7 TL1A 40 40 Δ +8% 31 Δ +14% 30 30 27 25 23 20 20 20 11 10 10 0 0 adalimumab vedolizumab golimumab afimkibart tulisokibart duvakitug Established α4β7 long-term safety profile and gut-restrictive MOA TL1A safety is encouraging to date© 2026 Spyre Therapeutics, Inc. Product labels, Sands BE. et al. N Engl J Med. 2019; Roivant corporate presentation January 2023; Sands, Bruce E., et al. New England Journal of Medicine 391.12 (2024); Teva 16 All rights reserved. corporate presentation February 2025.

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Spyre MOAs address the diverse pathophysiology of IBD by targeting distinct pathways Blockade of α4β7 prevents circulating immune cells Neutralization of TL1A suppresses inflammation and Neutralization of IL-23 inhibits cascade of various from entering inflamed gut tissues reduces fibrosis by inhibiting fibroblast activation proinflammatory cytokines anti-IL-23 anti-α4β7 anti-TL1A© 2026 Spyre Therapeutics, Inc. 17 Created with BioRender.com; Neurath, Markus F. Nature Reviews Gastroenterology & Hepatology 14.5 (2017): 269-278; Solitano, Virginia, et al. Med (2024). All rights reserved.

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Combination therapy results in additive-to-superior efficacy in mouse TNBS colitis model α4β7 + TL1A α4β7 + IL-23 TL1A + IL-23 12 12 12 10 10 10 8 8 8 6 6 6 \*\*\* \*\* \* \*\*\*\* \*\*\* \* \*\*\*\* 4 \*\*\*\* 4 4 \* \*\* \*\*\*\* \*\*\*\* \*\*\*\* \*\*\*\* \*\*\*\* \*\*\* \*\*\*\* 2 \*\*\*\* 2 2 \*\*\*\* \*\*\*\* \* \*\*\*\* 0 0 0 -1 0 1 2 3 4 5 6 -1 0 1 2 3 4 5 6 -1 0 1 2 3 4 5 6 Days Days Days Healthy anti-β7 (25 mg/kg) Healthy anti-TL1A (25 mg/kg) Healthy anti-β7 (25 mg/kg) Vehicle Control anti-TL1A (25 mg/kg) Vehicle control anti-IL-23 (1 mg/kg) Vehicle anti-IL-23 (25 mg/kg) anti-β7 + anti-TL1A anti-β7 + anti-IL-23 anti-TL1A + anti-IL-23 (25 mg/kg, 25 mg/kg) (25 mg/kg, 1 mg/kg) (25 mg/kg, 25 mg/kg)© 2026 Spyre Therapeutics, Inc. Data on file. Preclinical models utilized surrogate antibodies. \*P<0.05, \*\*P<0.01, \*\*\*P<0.001, \*\*\*\*P<0.0001 vs. vehicle (2-way ANOVA with Dunnett's correction). N=8 per group. 18 All rights reserved. TNBS=trinitrobenzene sulfonic acid. DAI score Disease improvement

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SKYLINE: Phase 2 platform study evaluating three monotherapies and three combinations in UC Part A: Open-label monotherapy evaluation (N=~100) KEY ENDPOINTS OBJECTIVES UC mMS 5-9 INDUCTION MAINTENANCE P Monotherapy POC Change in RHI at W12 SPY001 (α4β7) Sequential S activation SPY002 (TL1A) Clinical remission at W12 after Ph1 SPY003 (IL-23) S Endoscopic improvement at W12 W12 W48 S Change in mMS at W12 P Part B: PBO-controlled factorial combination evaluation (N=~550) INDUCTION MAINTENANCE UC mMS 5-9 SPY001 (α4β7) ~50:50 naïve:experienced P Monotherapy dose optimization Clinical remission at W12 SPY002 (TL1A) α4β7 and IL-23 failures capped S Combination POC Endoscopic improvement at W12 SPY003 (IL-23) S Contribution of components Clinical response at W12 Seamless SPY120 (α4β7+TL1A) enrollment S after Part A Histological improvement at W12 SPY130 (α4β7+IL-23) S HEMI at W12 SPY230 (TL1A+IL-23) Placebo S Clinical remission at W48 W48 W12 P© 2026 Spyre Therapeutics, Inc. mMS=modified mayo score; RHI=Robarts Histopathology Index; HEMI=Histo-Endoscopic Mucosal Improvement; P=primary endpoint; S=secondary endpoint 19 All rights reserved. Initiation of each cohort subject to regulatory clearance.

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Comparison to other trials highlights advantage of designing a portfolio from the ground up w/ unified dosing 1 TARGET-CD ARM INDUCTION MAINTENANCE (THROUGH W24) ARM INDUCTION MAINTENANCE (THROUGH W24) SPY001 Mono 1 SPY002 Mono 2 SPY003 Mono 3 SPY120 Combo 1 SPY130 Combo 2 SPY230 PBO ü Unified dosing intervals and formats enables blinded trial × Mix of IV, SC, and OBI routes of administration; open label trial ü Two IV induction doses, Q3M-Q6M SC chronic dosing × Combos default to highest dosing frequency (Q2W or Q4W) ü Clear approach to advance coformulation for Ph3 × Unclear strategy to single product combination for Ph3 1© 2026 Spyre Therapeutics, Inc. Pending regulator feedback; Inferred dosing regimen based on Clinicaltrials.gov posting and dosing regimens of individual agents in commercial or prior monotherapy clinical trial settings. 20 All rights reserved. OBI=on body injector

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Best-in-class monotherapies provide foundation for paradigm-changing combinations for IBD Potential for best-in-indication positioning (UC example) Target product profiles 60 Monos: Comparable-to-better efficacy vs. standard of care Combos: Meaningfully improved efficacy vs. standard of care 40 Favorable safety profile Combo Target Profile No black box warning 20 Standard of care Mono Target Profile 1 IBD advanced Tx 2-4 doses per year 0 1 2 3 4 5 6 Black-box warnings Maintenance dosing interval (months) No black-box warning Positioning of Spyre programs is illustrative and based on Phase 1 results and illustrates what we believe we can potentially achieve. Placebo-adjusted clinical remission data are derived© 2026 Spyre Therapeutics, Inc. 21 from different clinical trials conducted at different times, with differences in trial design and patient populations. As a result, cross-trial comparisons cannot be made, and no head-to-head All rights reserved. 1 clinical trials have been conducted. Oral and SC administered products Pbo-adjusted clinical remission (%)

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Rheumatic diseases© 2026 Spyre Therapeutics, Inc. 22 All rights reserved.

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Substantial unmet need remains for the millions of individuals living with RA, PsA, and axSpA 1 2 2 • >3M individuals in the U.S. diagnosed with RA (>1.5M), PsA (~1M), and axSpA (~1M) • Substantial unmet need remains due to: – Minority remission rates, inability to control multiple aspects of disease, and lack of durability with existing therapies – Limited MOAs to cycle through following incomplete responses – Poor adherence to frequent and/or inconvenient dosing regimens 3 Placebo-adjusted efficacy rates by MOA (W24) 100 80 60 40 20 0 RA (ACR50) PsA (ACR50) axSpA (ASAS40) 1 2© 2026 Spyre Therapeutics, Inc. Hunter, Theresa M., et al. Rheumatol Int (2017); Ogdie, Alexis, et al. Rheumatol Ther (2021); Danve, Abhijeet, and Atul Deodhar. Clinical rheumatology 38.3 (2019). Efficacy rates by 23 3 4 All rights reserved. MOA from product labels. Note: Week 24 data when available, otherwise data is Week 12 or 16; Includes IL-12/23 and IL-23 TNF JAK IL-6 CD80/86 CD20 TNF JAK IL-17 4 IL-23 TNF JAK IL-17

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TL1A has been implicated in several inflammatory and fibrotic diseases, with strong rationale in rheumatic diseases TL1A exacerbates inflammation and fibrosis Target rheumatic diseases share mechanistic pathways with IBD, where POC is established Fibroblasts 1 POC studies T 1 \| T 17 \| T 9 NK \| T 2 \| ILCs H H H H FLS \| osteoclasts Ulcerative colitis (UC) ü • Crohn's disease (CD)ü • • Rheumatoid arthritis (RA) • • Psoriatic arthritis (PsA) • Axial spondyloarthritis (axSpA) • Psoriasis (PsO) • Hidradenitis suppurativa (HS) • • Primary biliary cholangitis (PBC) • • Pulmonary sarcoidosis • Interstitial lung disease (SSc-ILD) • Metabolic steatohepatitis (MASH) • Atopic dermatitis (AD) • Asthmaû • 1 Figure created with BioRender.com. Logos indicate active clinical POC studies.© 2026 Spyre Therapeutics, Inc. 24 Hisamoto, T. et al. Int. J. Mol. Sci. 24, 1813 (2023); Herro, R. et al. J. Immunol. 205(9), 2414-2422 (2020); Ma, C. et al. Int. Immunopharm. 137, 112360 (2024); Richard, A. et al. JLB 3(98), All rights reserved. 333-345 (2015); Song, Y. et al. Arthritis Research & Therapy 22, 106 (2020); Xu, W. et al. Frontiers in Immunology 13, 891328 (2022). Increasing overlap with clinically validated biology

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TL1A is upregulated in RA, PsA, and axSpA relative to healthy controls Rheumatoid arthritis Psoriatic arthritis Axial spondyloarthritis 200 800 8000 ✱ ✱ ✱ ✱ ✱ ✱ ✱ ✱ ✱ ✱ ✱ 150 6000 600 100 4000 400 2000 50 200 0 0 -2000 0 -50 Healthy Rheumatoid Healthy axSpA Healthy PsA PsA Control arthritis Control Control Uninvolved Lesion Source Whole blood Skin biopsy Whole blood Sequencing Microarray Bulk RNA seq Microarray Sample size N=192 RA, 30 HC N=9 per cohort N=52 axSpA, 20 HC Spyre analysis of RA-MAP, Li, Sifang, et al. BMC Musculoskeletal Disorders 25.1 (2024), and Johnsson, Hanna, et al. Arthritis Research & Therapy.© 2026 Spyre Therapeutics, Inc. 25 \*\* P≤0.01, \*\*\* P ≤0.001, \*\*\*\* P ≤0.0001. Unpaired tailed t-test used for RA and axSpA analysis, One-way ANOVA used in PsA. All rights reserved. RA=rheumatoid arthritis; PsA=psoriatic arthritis; axSpA=axial spondyloarthritis; HC=healthy controls. TNFSF15 Counts TNFSF15 Counts TNFSF15 Counts

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Spyre anti-TL1A antibody meets or exceeds the efficacy of etanercept (anti-TNF) in rat models of arthritis Superior efficacy in semi-preventative model Comparable efficacy in therapeutic model Collagen Treatment period Collagen Treatment period 8 8 Healthy Healthy Vehicle Vehicle Isotype control Isotype control 6 6 anti-TNF anti-TNF anti-TL1A anti-TL1A 4 4 \* \* 2 2 \* \* \* 0 0 5 10 15 20 25 5 10 15 20 25 Day Day© 2026 Spyre Therapeutics, Inc. 26 \* P< 0.0001 vs. isotype control; 2-way ANOVA using Dunnett's correction for multiple comparisons. Data on file. All rights reserved. Arthritis score Disease improvement Arthritis score Disease improvement

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Robust anti-TL1A activity further replicated in mouse models of arthritis Anti-TL1A prevents disease and bone erosion Comparable efficacy to anti-TNF 6 4 \*\*\*\* \*\*\*\* 2 Healthy Diseased Diseased Diseased \*\*\*\* 0 Control Control anti-TL1A anti-TNF Healthy Disease anti-TL1A anti-TNF control control© 2026 Spyre Therapeutics, Inc. 27 Data on file. \*\*\*\* P ≤0.0001 All rights reserved. Histopathology Score

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Additionally, anti-TL1A treatment led to comparable improvements in psoriatic skin lesions in mouse IMQ model Anti-TL1A reduces skin lesions Comparable efficacy to anti-IL-23 and anti-TNF 6 4 10 Healthy control Disease control 2 \*\*\*\* \*\*\*\* \*\*\*\* 8 anti-TL1A anti-IL-23 \*\*\*\* 0 anti-TNF 6 Healthy control Disease control 4 2 0 0 1 2 3 4 5 6 7 Days Potential for robust skin clearance in PsA anti-TL1A anti-IL-23 anti-TNF© 2026 Spyre Therapeutics, Inc. 28 Data on file. \*\*\*\* P ≤0.0001 All rights reserved. Healthy control Disease control anti-TL1A anti-IL-23 anti-TNF PASI Scores (0-12) Histopathology Score

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SKYWAY: Phase 2 basket study evaluating SPY072 (anti- TL1A) in RA, PsA, and axSpA Sub-study A: SPY072 in moderate-to-severely active rheumatoid arthritis (RA) KEY ENDPOINTS DOUBLE-BLIND OPEN-LABEL FOLLOW UP KEY INCLUSION SPY072 Dose A Swollen joint count ≥ 4 P Change in DAS28-CRP at W12 RA 1:1:1 S Tender joint count ≥ 4 Proportion ACR20 at W12 N=120 SPY072 Dose B RF+, ACPA+, or bony erosions E ACR50/70 at W12 Placebo IR to cs/b/tsDMARDs W12 W36 P Sub-study B: SPY072 in moderate-to-severely active psoriatic arthritis (PsA) SPY072 Dose A Tender joint count ≥ 3/68 P Proportion ACR20 at W16 PsA 2:1 S Swollen joint count ≥ 3/66 Change in DAPSA at W16 Placebo N=90 Active PsO lesion or history E ACR50/70 at W16 W16 W40 IR to NSAIDs or cs/b/tsDMARDs P Sub-study C: SPY072 in moderate-to-severely active axial spondyloarthritis (axSpA) Radiographic / non-radiographic P Change in ASDAS at W16 SPY072 Dose A axSpA 2:1 S BASDAI ≥ 4 & back pain ≥ 4 Proportion ASAS40 at W16 N=75 Placebo IR to NSAIDs or b/tsDMARDs W40 W16 P© 2026 Spyre Therapeutics, Inc. RF=rheumatoid factor; ACPA= Anti-citrullinated protein antibodies; cs/b/tsDMARD=conventional synthetic, biologic, or targeted synthetic disease modifying antirheumatic drugs; 29 All rights reserved. BASDAI=Bath Ankylosing Spondylitis Disease Activity Index; P=primary endpoint; S=secondary endpoint; E=exploratory endpoint. IR=inadequate response

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SPY072 is a potential first-in-class & best-in-class therapy for rheumatic diseases with quarterly or twice-annual dosing Potential for best-in-indication positioning (RA example) SPY072 target product profile 60 First-in-class anti-TL1A Comparable-to-better efficacy 40 Favorable safety profile No black box warning SPY072 Target Profile 20 Standard of care 1 RA advanced Tx 2-4 doses per year 0 1 2 3 4 5 6 Black-box warning Maintenance dosing interval (months) No black-box warning Positioning of Spyre programs is illustrative and based on Phase 1 interim results. Placebo-adjusted clinical data are derived from different clinical trials conducted at different times, with© 2026 Spyre Therapeutics, Inc. 1 30 differences in trial design and patient populations. As a result, cross-trial comparisons cannot be made, and no head-to-head clinical trials have been conducted. Oral and SC administered All rights reserved. products. Pbo-adjusted ACR50

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Catalysts & capitalization

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Capitalized to deliver one of the industry's most compelling catalyst maps Trial 2026 2027 q SPY001 α4β7 Ph2 UC induction POC q SPY001 α4β7 Ph2 UC maintenance data Readouts beginning TL1A TL1A q SPY002 Ph2 UC induction POC q SPY002 Ph2 UC maintenance data Q2 q SPY003 IL-23 Ph2 UC induction POC q SPY003 IL-23 Ph2 UC maintenance data Part A (Open-label) α4β7 + TL1A q SPY120 Ph2 UC induction POC α4β7 + IL-23 q SPY130 Ph2 UC induction POC TL1A + IL-23 q SPY230 Ph2 UC induction POC q Initiate enrollment of Part B cohorts α4β7 q SPY001 Ph2 UC induction POC TL1A q SPY002 Ph2 UC induction POC IL-23 Part B (Pbo-controlled)q SPY003 Ph2 UC induction POC TL1A TL1A q SPY072 Ph2 W12 POC in RA q SPY072 Ph2 maintenance data in RA All readouts expected TL1A TL1A q SPY072 Ph2 W16 POC in PsA q SPY072 Ph2 maintenance data in PsA Q4 TL1A TL1A q SPY072 Ph2 W16 POC in axSpA q SPY072 Ph2 maintenance data axSpA 1 $783 million pro forma cash as of September 30, 2025 , with expected runway into 2H 2028 1© 2026 Spyre Therapeutics, Inc. Milestones expected as of the date of this presentation. Reflects cash, cash equivalents, & marketable securities as of 9/30/25 of $486.2 million plus $296.5 million in net proceeds from 32 All rights reserved. the October 2025 underwritten public offering of common stock

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Cash and shares outstanding 1 $783M pro forma cash as of September 30, 2025 Number of shares (M) Expected runway into 2H 2028 Common stock Shares outstanding 77.6 13.8 • Series A preferred stock Common stock equivalents • Series B preferred stock 0.7 Common stock and Total outstanding 92.1 2 common stock equivalents 1 Reflects cash, cash equivalents, & marketable securities as of 9/30/25 of $486.2 million plus $296.5 million in net proceeds from the October 2025 underwritten public offering of© 2026 Spyre Therapeutics, Inc. 2 33 common stock; Shares outstanding on a pro forma and as-converted basis as of 9/30/25, inclusive of the October 2025 financing, which (i) gives effect to the full conversion of the All rights reserved. Company's preferred stock, and (ii) disregards beneficial ownership limitations that may limit the ability of certain holders of preferred stock to convert into common stock.

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THANK YOU Engineering for new heights in the treatment of IBD and beyond

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2026 Part A readout: Comparable safety and efficacy as in- class comparators Primary endpoint Secondary endpoints ΔRHI from baseline (W14-16) Absolute % clinical remission (W6-14) Absolute % endoscopic improvement (W6-14) α4β7 Vedolizumab Adalimumab Obefazimod TL1A 50 0 IL-23 40 -2 30 -4 20 -6 10 0 -8© 2026 Spyre Therapeutics, Inc. Source: Vedolizumab (VARSITY, GEMINI I), adalimumab (VARSITY), obefazimod (Ph2b – 50 mg), tulisokibart (ARTEMIS-UC), afimkibart (TUSCANY-2), risankizumab (INSPIRE), 35 All rights reserved. guselkumab (QUASAR), mirikizumab (LUCENT 1); Duvakitug not shown given outlier placebo response rate. Vedo (W6) Vedolizumab (W14) Tulisokibart Afimkibart 450 mg Risankizumab Guselkumab Mirikizumab Vedolizumab Tulisokibart Afimkibart 450 mg Risankizumab Guselkumab Mirikizumab

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2026 RA readout: Aiming for ΔDAS28-CRP and ACRs comparable-to-better than SOC analogs Primary endpoint Secondary & exploratory endpoints 1 2 Placebo-adjusted ΔDAS28-CRP (W12-26) Placebo-adjusted % (W12-26) 0.0 100 80 -0.5 60 -1.0 ~30% 40 ~20% ~10% -1.5 20 ΔDAS28-CRP -2.0 0 ACR20 ACR50 ACR70 1 2© 2026 Spyre Therapeutics, Inc. Notes: Results from studies in mixed populations or weighted average of naïve and inadequate response (IR) trial results. Average ACR values from pivotal studies of approved products 36 All rights reserved. within each class. Data on file. TNF Humira TNF Simponi JAK Rinvoq JAK Xeljanz IL-6 Kevzara TNF JAK IL-6 CD80/86 TNF JAK IL-6 CD80/86 TNF JAK IL-6 CD80/86

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2026 PsA readout: Aiming for ACRs and PASI comparable-to- better than SOC analogs Primary endpoint Secondary & exploratory endpoints Placebo-adjusted % (W12-24) Placebo-adjusted % (W12-24) 100 80 Upside 60 Min. ~30% ~20% 40 ~15% 20 0 ACR20 ACR50 ACR70 PASI75© 2026 Spyre Therapeutics, Inc. 37 Average ACR and PASI values from pivotal studies of approved products within each class. IL-23 includes IL-12/23. Data on file. All rights reserved. TNF JAK IL-17 IL-23 TNF JAK IL-17 IL-23 TNF JAK IL-17 IL-23 TNF JAK IL-17 IL-23

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2026 axSpA readout: Aiming for ΔASDAS and ASAS comparable-to-better than SOC analogs Primary endpoint Secondary & exploratory endpoints 1 2 Placebo-adjusted ΔASDAS (W12-16) Placebo-adjusted % (W12-16) 0.0 100 80 -0.4 60 ~25% ~25% 40 -0.8 20 -1.2 0 ΔASDAS ASAS20 ASAS40© 2026 Spyre Therapeutics, Inc. 1 2 38 Results from studies in mixed populations Average ASAS values from pivotal studies of approved products within each class. Data on file. All rights reserved. JAK Rinvoq JAK Xeljanz IL-17 Cosentyx IL-17 Bimzelx TNF JAK IL-17 TNF JAK IL-17