Q32 Bio Reports Second Quarter 2025 Financial Results and Provides Corporate Update

-- Dosing of patients in Part A open-label extension (OLE) and Part B of SIGNAL-AA ongoing; SIGNAL-AA Part B topline data readout on-track for 1H'26 -- -- Strengthened leadership team with appointment of Adrien Sipos, M.D., Ph.D., an immunologist and seasoned Immunology and Inflammation (I&I) drug developer, as Interim Chief Medical Officer -- -- Cash and cash equivalents of $54.8 million as of June 30, 2025, which is now expected to provide financial runway into 2027 -- , /PRNewswire/ -- Q32 Bio Inc. (Nasdaq: QTTB) ("Q32 Bio"), a clinical stage biotechnology company focused on developing innovative therapies for alopecia areata (AA) and other autoimmune and inflammatory diseases, today reported financial results for the quarter ended June 30, 2025, and provided recent corporate updates. "This quarter, we continued to execute across our bempikibart development program with patient dosing underway and enrollment on-track in both the Part A OLE and Part B portions of the Phase 2a SIGNAL-AA trial," said Jodie Morrison, Chief Executive Officer of Q32 Bio. "We strengthened our leadership team with the addition of Adrien Sipos, M.D., Ph.D., as Interim Chief Medical Officer, whose immunology and inflammation drug development expertise will be invaluable as we advance bempikibart through key stages of development. We remain ever-focused on advancing bempikibart for patients with alopecia areata and are on track to deliver topline data from Part B in the first half of next year while extending our cash runway into 2027." Second Quarter 2025 and Recent Business Highlights Dosing of patients in Part B of the SIGNAL-AA Phase 2a clinical trial is ongoing, with topline data readout on-track for the first half of 2026. Part B of the SIGNAL-AA Phase 2a clinical trial is an open-label clinical trial evaluating bempikibart, a fully human anti-IL-7Rα antibody designed to re-regulate adaptive immune function by blocking IL-7 and TSLP signaling, in patients with severe or very severe AA. The ongoing trial will dose approximately 20 evaluable patients with severe or very severe AA with bempikibart for 36 weeks, with follow-up out to 52 weeks. Dosing includes an initial loading regimen of 200mg of bempikibart dosed weekly over four weeks, followed by a maintenance dose of 200mg every-other-week over a 32-week period for a total dosing period of 36 weeks. Efficacy will be evaluated on the basis of mean percentage change from baseline in Severity of Alopecia Tool (SALT) scores as well as the proportion of subjects achieving various relative and absolute SALT improvements at week 36, with follow-up through week 52. The trial is intended to support advancement into pivotal trials upon completion, pending review of the results. Q32 Bio expects to report topline results in the first half of 2026. Dosing of patients in Part A OLE of the SIGNAL-AA Phase 2a clinical trial is ongoing. Based on the continued emergence of bempikibart data suggesting a remittive effect and durable responses in long-term follow-up from SIGNAL-AA Part A, as well as re-consent rates and strong patient demand for continued dosing, Q32 Bio initiated an OLE for eligible patients that completed Part A to enable longer-term follow-up of patients. Patient dosing is ongoing. Appointed Adrien Sipos, M.D., Ph.D., as Interim Chief Medical Officer. Dr. Sipos is an immunologist and seasoned Immunology and Inflammation (I&I) drug developer, with over 25 years of clinical development and medical affairs leadership experience. Fast Track designation (FTD) granted to bempikibart for the treatment of AA. Fast Track is a process designed to facilitate the development and expedite the review of new drugs to treat serious diseases and fill an unmet medical need with the purpose of getting important new drugs to patients earlier. Filling an unmet medical need is defined as providing a therapy where either none exists or providing a therapy which may be potentially better than available therapies. A drug that receives FTD may be eligible for more frequent meetings and communications with the FDA to discuss development plans and ensure the collection of appropriate data needed to support approval and for a rolling review of an application for marketing approval. Drugs receiving FTD may also be eligible for Accelerated Approval and Priority Review if relevant criteria are met. Financial Results Cash and cash equivalents were $54.8 million as of June 30, 2025. Q32 Bio believes its cash and cash equivalents are sufficient to fund operations into 2027, through the SIGNAL-AA OLE and topline results of the SIGNAL-AA Part B trial evaluating bempikibart in patients with AA expected in the first half of 2026. Research and development expenses were $5.2 million for the three months ended June 30, 2025, compared to $13.4 million for the three months ended June 30, 2024. The decrease in expense of $8.2 million was primarily due to lower bempikibart development costs including clinical and manufacturing spend, as well as lower direct research and development expenses related to ADX-097 and lower personnel-related costs due to the discontinuation of the ADX-097 Phase 2 clinical trial and restructuring announced in February 2025 as compared to the prior year. General and administrative expenses were $4.0 million for the three months ended June 30, 2025, compared to $4.5 million for the three months ended June 30, 2024. The decrease in expense of $0.5 million was primarily due to lower personnel-related costs as a result of reduced headcount associated with the restructuring in February 2025 as well as lower legal costs as compared to the prior year. Net loss was $9.5 million, or $0.78 basic and diluted net loss per share, for the three months ended June 30, 2025, compared to net loss of $17.0 million, or $1.42 basic and diluted net loss per share, for the three months ended June 30, 2024. About Q32 Bio Q32 Bio is a clinical stage biotechnology company whose science targets potent regulators of the adaptive immune system to re-balance immunity and is focused on developing innovative therapies for alopecia areata and other autoimmune and inflammatory diseases. About 700,000 people in the United States live with alopecia areata1, a disease which has a life-altering impact on patients and limited current treatment options. Q32 Bio is advancing bempikibart (ADX-914), a fully human anti-IL-7Rα antibody that re-regulates adaptive immune function, for the treatment of alopecia areata in an ongoing Phase 2 program. The IL-7 and TSLP pathways have been genetically and biologically implicated in driving several T cell-mediated pathological processes in numerous autoimmune diseases. For more information, visit www.Q32Bio.com. 1National Alopecia Areata Foundation Availability of Other Information About Q32 Bio Investors and others should note that Q32 Bio communicates with its investors and the public using its website www.Q32Bio.com, including, but not limited to, Q32 Bio's disclosures, investor presentations and FAQs, Securities and Exchange Commission (the "SEC") filings, press releases, public conference call transcripts and webcast transcripts, as well as on X (formerly Twitter) and LinkedIn. The information that Q32 Bio posts on its website or on X or LinkedIn could be deemed to be material information. As a result, Q32 Bio encourages investors, the media and others interested to review the information that it posts there on a regular basis. The contents of Q32 Bio's website or social media shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended. Forward-Looking Statements This communication contains forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, as amended, and other federal securities laws. Any statements contained herein which do not describe historical facts are forward-looking statements, including, among others, Q32 Bio's beliefs, observations, expectations and assumptions regarding the plan, purpose and timing of Part B of the SIGNAL-AA Phase 2a clinical trial and the anticipated timing of its data, the safety, tolerability, clinical activity, durability, potential efficacy and potential benefits of bempikibart, the potential benefits conferred by FTD for bempikibart, the expectations surrounding leadership appointment, and Q32 Bio's beliefs, expectations and assumptions regarding the future of its business, future plans and strategies, including statements regarding the sufficiency of its cash and cash equivalents to provide financial runway through clinical milestones and into 2027; which involve risks and uncertainties that could cause actual results to differ materially from those discussed in such forward-looking statements. Forward-looking statements are based on management's current beliefs and assumptions, which are subject to risks and uncertainties and are not guarantees of future performance. Such risks and uncertainties include, among others, the risk that additional data, or the results of ongoing data analyses, may not support Q32 Bio's current beliefs and expectations for bempikibart, including with respect to the durability of clinical responses, the risk that ongoing and future clinical studies, including Part B of the SIGNAL-AA Phase 2a clinical trial, may not be completed by the first half of 2026 or at all, might be more costly than expected or might not yield anticipated results, that FTD by the FDA may not actually lead to a faster development or regulatory review or approval process, that Q32 Bio may use its capital resources sooner than currently anticipated and such other risks and uncertainties identified in Q32 Bio's periodic, current and other filings with the SEC, including its Quarterly Report on Form 10-Q for the quarter ended March 31, 2025 and any subsequent filings with the SEC, which are available at the SEC's website at www.sec.gov. Any such risks and uncertainties could materially and adversely affect Q32 Bio's results of operations and its cash flows, which would, in turn, have a significant and adverse impact on Q32 Bio's stock price. Q32 Bio cautions you not to place undue reliance on any forward-looking statements, which speak only as of the date they are made. Q32 Bio disclaims any obligation to publicly update or revise any such statements to reflect any change in expectations or in events, conditions or circumstances on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in the forward-looking statements. Contacts:Investors: Brendan BurnsArgot Partners212.600.1902[email protected] Media: David RosenArgot Partners646.461.6387[email protected] Q32 BIO INC. CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except share and per share amounts) (Unaudited) Three Months Ended June 30, Six Months Ended June 30, 2025 2024 2025 2024 Operating expenses: Research and development $ 5,161 $ 13,411 $ 12,286 $ 23,252 General and administrative 4,010 4,508 9,114 9,510 Total operating expenses 9,171 17,919 21,400 32,762 Loss from operations (9,171) (17,919) (21,400) (32,762) Change in fair value of convertible notes — — — 15,890 Other income (expense), net (318) 2,390 880 2,548 Total other income (expense), net (318) 2,390 880 18,438 Loss before provision for income taxes and loss from equity method investment (9,489) (15,529) (20,520) (14,324) Provision for income taxes — — — — Loss from equity method investment — (1,449) — (1,625) Net loss $ (9,489) $ (16,978) $ (20,520) $ (15,949) Net loss per share—basic $ (0.78) $ (1.42) $ (1.68) $ (2.46) Net loss per share—diluted $ (0.78) $ (1.42) $ (1.68) $ (4.44) Weighted-average common shares—basic 12,197,615 11,964,224 12,197,615 6,479,752 Weighted-average common shares—diluted 12,197,615 11,964,224 12,197,615 7,149,202 Q32 BIO INC. CONDENSED CONSOLIDATED BALANCE SHEETS (in thousands) (Unaudited) June 30,2025 December 31,2024 Assets Cash and cash equivalents $ 54,832 $ 77,965 Equity investment — 2,600 Right-of-use asset, operating leases 5,416 5,722 Restricted cash and restricted cash equivalents 647 647 Other assets 5,222 5,398 Total assets $ 66,117 $ 92,332 Liabilities and stockholders' equity (deficit) Accounts payable, accrued expenses and other current liabilities $ 5,306 $ 10,468 CVR liability — 2,900 Lease liability, net of current portion 5,296 5,636 Venture debt 12,750 12,653 Other noncurrent liabilities 55,000 55,000 Stockholders' equity (deficit) (12,235) 5,675 Total liabilities and stockholders' equity (deficit) $ 66,117 $ 92,332 SOURCE Q32 Bio WANT YOUR COMPANY'S NEWS FEATURED ON PRNEWSWIRE.COM? 440k+ Newsrooms & Influencers 9k+ Digital Media Outlets 270k+ Journalists Opted In

Q32 Bio Reports Second Quarter 2025 Financial Results and Provides Corporate Update

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