Tango Therapeutics Reports Third Quarter 2024 Financial Results and Provides Business Highlights Form 8 K

Tango Therapeutics Reports Third Quarter 2024 Financial Results

and Provides Business Highlights

- Positive TNG462 clinical activity across multiple tumor types in the phase 1/2 clinical trial, program moving into full development with multiple combination studies -

- Clinical collaboration established with Revolution Medicines to evaluate TNG462 in combination with RAS(ON) multi- and G12D-selective inhibitors -

- Next-generation brain-penetrant MTA-cooperative PRMT5 inhibitor, TNG456, planned to enter the clinic in 1H 2025 -

- Strong cash position of $293 million as of September 30, 2024,

with cash runway into 3Q 2026 to prioritize resourcing of TNG462 and TNG456 clinical trials -

BOSTON, Mass. - November 6, 2024 - Tango Therapeutics, Inc. (NASDAQ: TNGX), a clinical-stage biotechnology company committed to discovering and delivering the next generation of precision cancer medicines, reported its financial results for the third quarter ended September 30, 2024, and provided business highlights.

"We have made great progress with our PRMT5 development program, including positive data from the TNG462 phase 1/2 clinical trial that showcase the best-in-class potential of TNG462 in multiple tumor types, including pancreatic and non-small cell lung cancers (NSCLC). Based on these early data, we are advancing TNG462 into trials with multiple targeted and standard of care combinations, including two RAS(ON) tri-complex inhibitors from Revolution Medicines. Given that nearly all MTAP-deleted pancreatic cancer has a co-occurring RAS mutation, we believe this could be a powerful approach to changing the treatment landscape for this challenging cancer," said Barbara Weber, M.D., President and Chief Executive Officer of Tango Therapeutics. "As part of the expanded capabilities needed to rapidly move TNG462 development forward, Dr. Maeve Waldron-Lynch, M.D. is joining Tango as Senior Vice President, Head of Clinical Development. Dr. Waldron-Lynch has extensive late-stage oncology clinical development and regulatory experience and will be invaluable as we prepare to advance TNG462 to registration."

In a separate issued earlier today, Tango Therapeutics provided an update on its ongoing PRMT5 clinical development program:

Business Highlights

Clinical collaboration with Revolution Medicines

TNG260, a first-in-class, highly selective CoREST complex inhibitor

Upcoming Milestones

Additional Business and Pipeline Highlights

Leadership Update

Maeve Waldron-Lynch, M.D. will join Tango as Senior Vice President, Head of Clinical Development later this month. In this role, Dr. Waldron-Lynch will lead clinical development functions under Adam Crystal, M.D., Ph.D., President of Research and Development at Tango. Dr. Waldron-Lynch most recently served as VP and Global Clinical Program Head at MorphoSys, where she oversaw the clinical program for tafasitamab. Prior to MorphoSys, she was a Clinical Development Medical Director at Novartis. Dr. Waldron-Lynch also has served as Senior Clinical Director, Oncology at Roche, and as Associate Director of Medical Science, Oncology at Mundipharma. Dr. Waldron-Lynch graduated from the University College Cork School of

Medicine and served as a Specialty Registrar Medical Oncology at the Royal College of Physicians of Ireland, and a Clinical Fellow in Medical Oncology at the Yale University School of Medicine.

Financial Results

As of September 30, 2024, the Company held $293.3 million in cash, cash equivalents and marketable securities, which the Company expects to be sufficient to fund operations into the third quarter of 2026, including for additional planned TNG462 and TNG456 clinical trials.

Collaboration revenue was $11.6 million for the three months ended September 30, 2024, compared to $10.7 million for the same period in 2023, and $25.9 million for the nine months ended September 30, 2024 compared to $26.1 million for the same period in 2023. Collaboration revenue increased due to changes to estimated costs expected to be incurred under the collaboration during the three months ended September 30, 2024.

License revenue was $0 and $12.1 million for the three and nine months ended September 30, 2024, respectively, compared to $0 and $5.0 million for the three and nine months ended September 30, 2023, respectively. The year-to-date increase is primarily due to licensing a drug discovery program to Gilead for $12.0 million during the second quarter of 2024 as compared to Gilead licensing a program for $5.0 million during the second quarter of 2023.

Research and development expenses were $33.3 million for the three months ended September 30, 2024, compared to $27.1 million for the same period in 2023, and $110.0 million for the nine months ended September 30, 2024 compared to $83.9 million for the same period in 2023. The change is due to increased spend related to the advancement of TNG462, preclinical programs and personnel-related costs to support our research and development activities.

General and administrative expenses were $11.2 million for the three months ended September 30, 2024, compared to $9.2 million for the same period in 2023, and $32.7 million for the nine months ended September 30, 2024 compared to $26.4 million for the same period in 2023. The change was primarily due to increases in personnel-related costs.

Net loss for the three months ended September 30, 2024 was $29.2 million, or $0.27 per share, compared to a net loss of $22.3 million, or $0.23 per share, in the same period in 2023. Net loss for the nine months ended September 30, 2024 was $92.6 million, or $0.85 per share, compared to a net loss of $71.0 million, or $0.78 per share, in the same period in 2023.

About Tango Therapeutics

Tango Therapeutics is a clinical-stage biotechnology company dedicated to discovering novel drug targets and delivering the next generation of precision medicine for the treatment of cancer. Using an approach that starts and ends with patients, Tango leverages the genetic principle of synthetic lethality to discover and develop therapies that take aim at critical targets in cancer. For more information, please visit www.tangotx.com.

Forward-Looking Statements

Certain statements in this press release may be considered forward-looking statements. Forward-looking statements generally relate to future events, Tango's future operating performance and goals, the anticipated benefits of therapies and combination therapies (that include a Tango pipeline product), as well as the expectations, beliefs and development objectives for Tango's product pipeline and clinical trials. In some cases, you can identify forward-looking statements by terminology such as "may", "should", "expect", "intend", "will", "goal", "estimate", "anticipate", "believe", "predict", "designed," "potential" or "continue", or the negatives of these terms or variations of them or similar terminology. For example, implicit or explicit statements concerning the following include or constitute forward-looking statements: the Company is advancing TNG462 into clinical trials as a monotherapy and with multiple targeted and standard of care combinations, including two RAS(ON) tri-complex inhibitors from Revolution Medicines, Inc.; the Company believes the combination of TNG462 with RAS(ON) inhibitors could be a powerful approach to changing the treatment landscape for pancreatic cancer; potential combination strategies for PRMT5 inhibitors; the Company's view that TNG462 has the potential to be a best-in-class MTA-cooperative PRMT5 inhibitor in multiple tumor types, including pancreatic and non-small cell lung cancers; the Company is moving TNG462 into full development; the Company expects cash runway into the third quarter of 2026; the Company expects to share another clinical update on TNG462 in 2025; the Company's planned and ongoing clinical trials, including the anticipated timing for enrollment and the timing to report results and updates of such trials; the Company's understanding of the central nervous system exposure required to provide meaningful efficacy in glioblastoma and brain metastases; the Company's plans to enroll patients in a planned Phase 1/2 clinical trial for TNG456 in the first half of 2025; the Company continues to advance TNG260 for cancers with STK11 loss-of-function mutations, with the phase 1/2 clinical trial ongoing; Tango is committed to discovering and delivering the next generation of precision cancer medicines; Dr. Weber's statements in this press release; and the expected timing of: (i) development candidate declaration for certain targets; (ii) initiating IND-enabling studies; (iii) filing INDs; (iv) clinical trial

initiation, dose escalation and dose expansion (including for combination studies) and (v) disclosing initial, interim, additional and final clinical trial results (including for combination studies); and the expected benefits of the Company's development candidates and other product candidates. Such forward-looking statements are subject to risks, uncertainties, and other factors which could cause actual results to differ materially from those expressed or implied by such forward-looking statements. These forward-looking statements are based upon estimates and assumptions that, while considered reasonable by Tango and its management, are inherently uncertain. New risks and uncertainties may emerge from time to time, and it is not possible to predict all risks and uncertainties. Factors that may cause actual results to differ materially from current expectations include, but are not limited to: the benefits of product candidates seen in preclinical tests and analyses may not be evident when tested in later preclinical studies or in clinical trials or when used in broader patient populations (if approved for commercial sale); Tango has limited experience conducting clinical trials (and will rely on a third party to operate its clinical trials) and may not be able to commence its clinical trials (including opening clinical trial sites, dosing the first patient, and continued enrollment and dosing of an adequate number of clinical trial participants) when expected, may not be able to continue dosing, initiate dose escalation and/or dose expansion on anticipated timelines, and may not generate or report clinical trial results (including final, initial or additional safety, efficacy data and proof-of-mechanism and proof-of-concept) in the anticipated timeframe (or at all); future clinical trial data releases may differ materially from initial or interim data from our current and future clinical trials; Tango's pipeline products may not be safe and/or effective in humans; Tango has a limited operating history and has not generated any revenue to date from product sales, and may never become profitable; other companies may be able to identify and develop product candidates more quickly than the Company and commercially introduce the product prior to the Company; the Company's proprietary discovery platform is novel and may not identify any synthetic lethal targets for future development; the Company may not be able to identify development candidates on the schedule it anticipates due to technical, financial or other reasons; the Company may not be able to file INDs for development candidates on time, or at all, due to technical or financial reasons or otherwise; the Company may utilize cash resources more quickly than anticipated; Tango will need to raise capital in the future and if we are unable to raise capital when needed or on attractive terms, we would be forced to delay, scale back or discontinue some of our development programs or future commercialization efforts (which may delay filing of INDs, dosing patients, initiation of dose expansion, reporting clinical trial results and filing new drug applications); Tango's approach to the discovery and development of product candidates is novel and unproven, which makes it difficult to predict the time, cost of development, and likelihood of successfully developing any products; the Company may be unable to advance our preclinical development programs into and through the clinic for safety or efficacy reasons or commercialize our product candidates or

we may experience significant delays in doing so as a result of factors beyond Tango's control; the Company may not be able to realize the benefits of orphan drug or Fast Track designation (and such designations may not advance any anticipated approval timelines); the expected benefits of our product candidates in patients as single agents and/or in combination may not be realized; the Company may experience delays or difficulties in the initiation, enrollment, or dosing of patients in clinical trials or the announcement of clinical trial results, Tango may not identify or discover additional product candidates or may expend limited resources to pursue a particular product candidate or indication and fail to capitalize on product candidates or indications that may be more profitable or for which there is a greater likelihood of success; the Company's product candidates may cause adverse or other undesirable side effects (or may not show requisite efficacy) that could, among other things, delay or prevent regulatory approval; our dependence on one or a limited number third parties for conducting clinical trials and producing drug substance and drug product (including drug substance, which is currently sole sourced); government regulation may negatively impact the Company's business, including the potential approval of the BIOSECURE Act; and our ability to obtain and maintain patent and other intellectual property protection for our technology and product candidates or the scope of intellectual property protection obtained is not sufficiently broad. Additional information concerning risks, uncertainties and assumptions can be found in Tango's filings with the Securities and Exchange Commission (SEC), including the risk factors referenced in Tango's Annual Report on Form 10-K for the fiscal year ended December 31, 2023, as supplemented and/or modified by its most recent Quarterly Report on Form 10-Q. 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. Tango specifically disclaims any duty to update these forward-looking statements.

Investor Contact:

Sam Martin/Andrew Vulis
Argot Partners
[email protected]

Media Contact:

Amanda Brown Galgay
SVP, Corporate Communications, Tango Therapeutics
[email protected]

Consolidated Statements of Operations

(In thousands, except share and per share data)

Consolidated Balance Sheets

(In thousands)