Health Catalyst Strengthens Its Board with the Appointment of Tami Reller (Form 8-K)

Health Catalyst Strengthens Its Board with the Appointment of Tami Reller

Reller Joins Health Catalyst as it Enters Its Next Phase of Growth

SALT LAKE CITY, Utah - September 14, 2026 - Health Catalyst, Inc. ("Health Catalyst", Nasdaq: HCAT), a healthcare intelligence company designed to accelerate measurable improvement for health systems, today announced that Tami Reller has been appointed to its board of directors (Board), effective October 1, 2026. Reller will serve as audit chair and as a member of its compensation committee, also effective October 1, 2026.

Reller's appointment follows the naming of Simeon Kohl as Chief Executive Officer and President, effective September 14, 2026. Under Kohl's leadership, Health Catalyst will continue advancing its highest-conviction technologies, positioning Health Catalyst as an AI-forward healthcare intelligence company built on 18 years of results and $2.8 billion in validated outcomes. Its technology, paired with leading healthcare expertise, helps solve health systems' hardest problems across cost, clinical, and consumer performance.

"How we build this board reflects where we believe Health Catalyst is headed," said Justin Spencer, Chairman of the Board of Health Catalyst. "Reller has guided public companies through periods of growth, has deep financial expertise, and has spent years operating where healthcare and technology meet, including on the healthcare delivery side. As the company continues to execute a focused strategy and invest in what's ahead, we're energized about this next chapter. Reller brings exactly the experience we need now."

Reller previously served in various leadership roles at Duly Health and Care, leading one of the largest independent physician groups in the U.S., including President from 2021 to 2022, CEO from 2022 to 2023 and executive chair from 2023 to 2024. Reller has spent decades at the intersection of healthcare and technology, with leadership experience in finance, growth, operations, marketing and consumer experience. She previously worked as a senior executive at Microsoft and held multiple leadership roles at various subsidiaries of UnitedHealth Group, including executive vice president and chief marketing and experience officer of UnitedHealthcare and chief growth officer, chief financial officer, and chief marketing officer of Optum.

Reller also brings extensive public-company board experience, having served as a member of the board of directors of SPS Commerce, Inc. (Nasdaq: SPSC) since 2016, including as a member of the audit committee, governance and nominating committee and five years as board chair, and between 2014 and 2022 served as a member of the board of directors of Avalara Inc. until its acquisition (formerly Nasdaq: AVLR), including service as a member of Avalara's audit committee and compensation committee. She has also served on non-profit boards, including the Seattle Children's Hospital Foundation, where she also served as Treasurer, and Fairview Health Services, a Minnesota-based nonprofit health system.

"I've spent my career on both sides of the technology and healthcare equation, including time on the healthcare delivery side, and I know what it takes to make technology truly deliver for a health system," said Reller. "Health Catalyst has the data, the proven results, and the focus - and from where I've sat on the health system side, I believe this is the moment for that experience to have great impact. That's why I wanted to join, and I'm eager to help the company deliver that impact."

About Health Catalyst

Health Catalyst, Inc. (Nasdaq: HCAT) is a healthcare intelligence company designed to accelerate measurable improvement for health systems across cost, clinical, and consumer performance. Backed by deep domain expertise, proprietary AI-driven technology, and $2.8 billion in documented outcomes, Health Catalyst helps health systems move from data to confident, measurable action.