LinkedIn Top Companies 2024: The 15 best midsize employers to grow your career in the U.S.

In the world of work, the limelight often falls on major corporations and fast-growing startups. But there’s an important group nestled in between that makes up a significant portion of the U.S. economy: midsize companies. With a unique blend of entrepreneurial spirit and established infrastructure, midsize firms offer a compelling alternative for many job seekers .

That’s why we’re unveiling our inaugural list of Top Midsize Companies in the U.S., featuring employers with 250 to 5,000 workers. This new ranking is a complement to our annual flagship Top Companies list, which features large companies like J.P. Morgan and Amazon, and uses the same data-backed methodology that looks at long-term career success, including factors like promotion rates, skill development and more. You can read more about how we compile the list at the bottom of the article.

More than just a ranking, you’ll find actionable insights on the roles, skills and functions in demand at each company. See one that sparks your interest? Take a look at their current job openings and connect with employees you may know, or use the new “I’m Interested ” button to stand out to recruiters at the company. You can check out recommended open roles at all 15 companies here .?

Here are this year’s 15 Top Midsize Companies in the U.S.?

You can check out our annual list of large Top Companies here.

1. Citrin Cooperman

Headquarters: New York City | Most notable skills: Tax Accounting, Auditing, Bookkeeping | Most common job titles: Tax Accountant, Audit Supervisor, Tax Director | Largest job functions: Accounting, Entrepreneurship, Business Development | Flexible work availability: 91.5% hybrid | What they do: Citrin Cooperman is a professional services firm providing tax, advisory and business consulting to its primarily midsize clients.??

See more about Citrin Cooperman | See jobs | See people you may know

2. Marcum LLP

Headquarters: New York City | Most notable skills: Tax Accounting, Tax Law, Investor Relations | Most common job titles: Tax Accountant, Audit Associate, Accounting Associate | Largest job functions: Accounting, Entrepreneurship, Information Technology | Flex work availability: 29.9% hybrid | What they do: Marcum is an accounting and advisory firm offering tax, assurance and accounting services to clientele ranging?from publicly traded companies to high net worth individuals.??

See more about life at Marcum | See jobs | See people you may know

3. Alnylam Pharmaceuticals

Headquarters: Cambridge, Mass. | Most notable skills: Gastroenterology, Pharmaceutical Manufacturing, Neurology | Most common job titles: Account Executive, Quality Assurance Manager, Associate Director | Largest job functions: Research, Operations, Business Development | Flex work availability: 47% hybrid | What they do: Alnylam Pharmaceuticals is a biotechnology company that leverages and develops RNA interference (RNAi) therapeutics to treat rare diseases. The company produced the first RNAi therapeutic to be approved by the FDA.?

See more about life at Alnylam | See jobs | See people you may know

4. Replimune

Headquarters: Woburn, Mass. | Most notable skills: Oncology, Pharmaceutical Manufacturing, Physiology | Most common job titles: Medical Science Liaison, Manufacturing Associate, Medical Director | Largest job functions: Research, Operations, Quality Assurance | What they do: Replimune is a clinical-stage biotechnology company focused on developing immunotherapies to treat a variety of cancers through the selective targeting of tumor cells.?

See more about life at Replimune | See jobs | See people you may know

5. Advocates for Human Potential (AHP)

Headquarters: Sudbury, Mass. | Most notable skills: Social Services, Property Management, Public Policy | Most common job titles: Outreach Manager, Program Manager, Senior Program Associate | Largest job functions: Administrative, Program and Project Management, Research | What they do: Advocates for Human Potential is a consulting firm that works with government and commercial organizations in areas ranging from mental health to veteran support.? ? ?

See more about life at AHP | See jobs | See people you may know

6. PKF O'Connor Davies

Headquarters: New York City | Most notable skills: Tax Accounting, Auditing, Bookkeeping | Most common job titles: Audit Associate, Audit Supervisor, Tax Accountant | Largest job functions: Accounting, Entrepreneurship, Administrative | Flex work availability: 64.7% hybrid | What they do: PKF O’Connor Davies is an accounting and advisory firm supporting domestic and international clients with a wide range of professional services including auditing, tax planning and financial advisory.?

See more about life at PKF O’Connor Davies | See jobs | See people you may know

7. Arcus Biosciences

Headquarters: Hayward, Calif. | Most notable skills: Oncology, Pathology, Pharmaceutical Manufacturing | Most common job titles: Senior Scientist, Research Associate, Principal Investigator | Largest job functions: Research, Operations, Healthcare Services | What they do: Arcus Biosciences is a biopharmaceutical company specializing in the development of combination therapies for cancer patients.?

See more about life at Arcus Biosciences | See jobs | See people you may know

8. Reinsurance Group of America (RGA)

Headquarters: Chesterfield, Mo. | Most notable skills: Capital Markets, Compensation and Benefits, Competitive Strategies | Most common job titles: Actuary, Software Engineer, Business Analyst | Largest job functions: Finance, Information Technology, Business Development | Flex work availability: 42.9% hybrid | What they do: Reinsurance Group of America is a global provider of life and health reinsurance solutions, helping insurance companies mitigate their financial exposure through risk management services.

See more about life at RGA | See jobs | See people you may know

9. Agilysys

Headquarters: Alpharetta, Ga. | Most notable skills: Enterprise Software, Software Testing, Computer Networking | Most common job titles: Software Engineer, Account Executive, Implementation Specialist | Largest job functions: Information Technology, Engineering, Sales | What they do: Agilysys is a software developer for the hospitality industry, helping hotels, casinos and food service venues optimize operations, drive revenue growth and enhance guest experiences.?

See more about Agilysys | See jobs | See people you may know

10. Plante Moran

Headquarters: Southfield, Mich. | Most notable skills: Tax Accounting, Tax Law, Auditing | Most common job titles: Audit Associate, Tax Accountant, Tax Specialist | Largest job functions: Accounting, Entrepreneurship, Consulting | Flex work availability: 43.1% hybrid | What they do: Plante Moran is a professional services firm specializing in audit, tax, consulting and wealth management support for its clients.?

See more about life at Plante Moran | See jobs | See people you may know

11. Blueprint Medicines

Headquarters: Cambridge, Mass. | Most notable skills: Oncology, Neurology, Pharmaceutical Manufacturing | Most common job titles: Area Business Manager, Senior Scientist, Associate Director | Largest job functions: Research, Business Development, Sales | Flex work availability: 90.9% hybrid | What they do: Blueprint Medicines is a biopharmaceutical company that develops precision therapies to treat patients in two core areas: allergy/inflammation and oncology/hematology.?

See more about life at Blueprint Medicines | See jobs | See people you may know

12. Lockwood

Lockwood is the parent company of Random 42 Scientific Communication and others.?

Headquarters: Stamford, Conn. | Most notable skills: Medical Writing, Consumer Services, Product Marketing | Most common job titles: Director of Biology, Project Manager, Director of Account Management | Largest job functions: Research, Program and Project Management, Sales | What they do: Lockwood is an advertising company working primarily in healthcare, providing services to clients across areas like pharmaceutics, biotech and medical devices.?

See more about life at Lockwood | See jobs | See people you may know

13. Standish Management

Headquarters: Boston, Mass. | Most notable skills: Tax Accounting, Investor Relations, Auditing | Most common job titles: Fund Controller, Engagement Manager | Largest job functions: Accounting, Business Development, Finance | Flex work availability: 87.2% hybrid | What they do: Standish Management is a fund administration company offering consulting, administration and technology services for managers and partners of buy-out, venture capital and funds-of-funds firms.?

See more about Standish Management | See jobs | See people you may know

14. Insulet Corporation

Headquarters: Acton, Mass. | Most notable skills: Manufacturing, Engineering, Consumer Services | Most common job titles: Clinical Services Manager, Territory Manager, Inside Sales Specialist | Largest job functions: Engineering, Sales, Healthcare Services | What they do: Insulet Corporation is a medical device company that develops wearable insulin-management systems for patients with diabetes.??

See more about life at Insulet | See jobs | See people you may know

15. AlixPartners

Headquarters: New York City | Most notable skills: Management Consulting, Financial Analysis | Most common job titles: Senior Vice President, Managing Director, Administrative Associate | Largest job functions: Business Development, Information Technology, Finance | What they do: AlixPartners is a business consulting firm that supports clients in various industries, specializing in the corporate turnaround space.?

See more about life at AlixPartners | See jobs | See people you may know

You can check out the Top Midsize Companies in Brazil , France , Germany , India , Spain and the UK .

Methodology

Our methodology uses LinkedIn data to rank companies based on eight pillars that have been shown to lead to career progression: ability to advance; skills growth; company stability; external opportunity; company affinity; gender diversity; educational background and employee presence in the country. Ability to advance tracks employee promotions within a company and when they move to a new company, based on standardized job titles. Skills growth looks at how employees across the company are gaining skills while employed at the company, using standardized LinkedIn skills. Company stability tracks attrition over the past year, as well as the percentage of employees that stay at the company at least three years. External opportunity looks at Recruiter outreach across employees at the company, signaling demand for workers coming from these companies. Company affinity, which seeks to measure how supportive a company’s culture is, looks at connection volume on LinkedIn among employees, controlled for company size. Gender diversity measures gender parity within a company and its subsidiaries. Educational background examines the variety of educational attainment among employees, from no degree up to Ph.D. levels, reflecting a commitment to recruiting a wide range of professionals. Finally, employee presence in the country looks at the company’s number of employees in the country relative to other companies, as a means of capturing companies that provide a diverse work environment and more opportunities for career advancement and networking.?

To be eligible, companies must be headquartered in the country on whose list they appear, have less than 5,000 global employees and at least 250 in the country as of Dec. 31, 2023.?Attrition can be no higher than 10% over the methodology time period, based on LinkedIn data. Similarly, organizations that have had layoffs of 10% or more of their workforce based on corporate announcements or public, reliable sources between Jan. 1, 2023 and the list launch, are not eligible. These decisions are made by the LinkedIn News team based on company statements and/or reputable news outlets. Only parent companies rank on the list; majority-owned subsidiaries and data about those subsidiaries are incorporated into the parent company score. The methodology time frame is Jan. 1, 2023 through Dec. 31, 2023. This analysis represents the world seen through the lens of LinkedIn data, drawn from the anonymized and aggregated profile information of LinkedIn's members around the world.

We exclude all staffing and recruiting firms, educational institutions and government agencies. We also exclude LinkedIn, its parent company Microsoft and Microsoft subsidiaries.

About company insights

Company insights were sourced from LinkedIn Talent Insights and include the parent company and majority-owned subsidiaries. Data reflects aggregated public member data from active LinkedIn profiles in the relevant country and includes employee profiles associated with the parent company and majority-owned subsidiaries on LinkedIn. We exclude members who identify as interns or contractors. All insights reflect a 12-month time period looking back from January 2024. Skills data was derived from measuring the most frequent unique skills among a company’s employees, relative to other companies. Most common job titles represent the occupations most common within each company. Largest job function measures the function area most prevalent within each company. Flexible work availability measures jobs flagged as “remote” or “hybrid” by the company or containing similar keywords.

Reported and proofread by: Ashley (Peterson) Botarelli Juliette Faraut Sarah McGrath

Methodology and insights by: Nadine Fares