STTK Shattuck Labs Inc

Shattuck Labs, Inc. (Shattuck) (Nasdaq: STTK), a clinical-stage biotechnology company pioneering the development of bifunctional fusion proteins as a new class of biologic medicine for the treatment of patients with cancer and autoimmune disease, today announced its addition to the Russell 2000® and Russell 3000® Indexes at the conclusion of the 2024 Russell U.S. Indexes annual reconstitution. Shattuck’s addition will be effective today when the U.S. equity markets open.

“We are pleased to be included in the Russell Indexes, which is reflective of the continued progress that we’ve made in 2024, including the rapid advancement of SL-172154 in HR-MDS and TP53m AML,” said Andrew R. Neill, Chief Financial Officer of Shattuck. “We are advancing SL-172154 as quickly as possible across these indications, which we believe will offer the fastest potential path to approval, and we look forward to providing additional updates from our ongoing clinical trials in the future.”

The annual Russell U.S. Indexes reconstitution captures the 4,000 largest U.S. stocks as of Tuesday, April 30th, ranking them by total market capitalization. Membership in the U.S. all-cap Russell 3000® Index, which remains in place for one year, means automatic inclusion in the large-cap Russell 1000® Index or small-cap Russell 2000® Index, as well as the appropriate growth and value style indexes. FTSE Russell determines membership for its Russell indexes primarily by objective, market-capitalization rankings, and style attributes. Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for active investment strategies. For more information on the Russell 3000® Index, the Russell 2000® Index, and the Russell indexes reconstitution, please refer to the “Russell Reconstitution” section on the FTSE Russell website.

About Shattuck Labs, Inc. Shattuck Labs, Inc. (Nasdaq: STTK) is a clinical-stage biotechnology company pioneering the development of bi-functional fusion proteins as a new class of biologic medicine for the treatment of patients with cancer and autoimmune disease. Compounds derived from Shattuck’s proprietary ARC® platform are designed to simultaneously inhibit checkpoint molecules and activate costimulatory molecules with a single therapeutic. The company’s lead SL-172154 (SIRPα-Fc-CD40L) program, which is designed to block the CD47 immune checkpoint and simultaneously agonize the CD40 pathway, is being evaluated in multiple Phase 1 trials. Shattuck has offices in both Austin, Texas and Durham, North Carolina. For more information, please visit: www.ShattuckLabs.com.

About FTSE Russell: FTSE Russell is a leading global provider of benchmarking, analytics, and data solutions for investors, giving them a precise view of the market relevant to their investment process. A comprehensive range of reliable and accurate indexes provides investors worldwide with the tools they require to measure and benchmark markets across asset classes, styles, or strategies.

FTSE Russell index expertise and products are used extensively by institutional and retail investors globally. For over 30 years, leading asset owners, asset managers, ETF providers and investment banks have chosen FTSE Russell indexes to benchmark their investment performance and create ETFs, structured products, and index-based derivatives.

FTSE Russell is focused on applying the highest industry standards in index design and governance, employing transparent rules-based methodology informed by independent committees of leading market participants. FTSE Russell fully embraces the IOSCO Principles, and its Statement of Compliance has received independent assurance. Index innovation is driven by client needs and customer partnerships, allowing FTSE Russell to continually enhance the breadth, depth and reach of its offering.

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For more information, visit https://www.lseg.com/en/ftse-russell.

Forward-Looking Statements Certain statements in this press release may constitute “forward-looking statements” within the meaning of the federal securities laws, including, but not limited to, statements regarding: future presentations of clinical data; clinical development timing, plans and strategies for SL-172154; timing of anticipated clinical data and clinical trials; future plans for Shattuck’s pipeline; and Shattuck’s strategies. Words such as “anticipate,” “may,” “might,” “will,” “objective,” “intend,” “should,” “could,” “can,” “would,” “expect,” “believe,” “design,” “estimate,” “predict,” “potential,” “develop,” “plan” or the negative of these terms, and similar expressions, or statements regarding intent, belief, or current expectations, are forward-looking statements. While the company believes these forward-looking statements are reasonable, undue reliance should not be placed on any such forward-looking statements, which are based on information available to the company on the date of this release. These forward-looking statements are based upon current estimates and assumptions and are subject to various risks and uncertainties (including, without limitation, those set forth in Shattuck’s filings with the U.S. Securities and Exchange Commission (SEC)), many of which are beyond the company’s control and subject to change. Actual results could be materially different. Risks and uncertainties which could cause such outcomes to change include: global macroeconomic conditions and related volatility; expectations regarding the initiation, progress, and expected results of Shattuck’s preclinical studies, clinical trials and research and development programs; the potential failure of a clinical trial to provide sufficient results to merit further development; expectations regarding the timing, completion and outcome of the company’s clinical trials; the unpredictable relationship between preclinical study results and clinical study results; the timing or likelihood of regulatory filings and approvals; liquidity and capital resources and other risks and uncertainties identified in Shattuck’s Annual Report on Form 10-K for the year ended December 31, 2023 and subsequent disclosure documents filed with the SEC. Shattuck claims the protection of the Safe Harbor contained in the Private Securities Litigation Reform Act of 1995 for forward-looking statements. Shattuck expressly disclaims any obligation to update or alter any statements whether as a result of new information, future events or otherwise, except as required by law.

The Company intends to use the investor relations portion of its website as a means of disclosing material non-public information and for complying with disclosure obligations under Regulation FD.

Investor & Media Contact: Conor Richardson Vice President of Investor Relations Shattuck Labs, Inc. InvestorRelations@shattucklabs.com