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Artisan Mid Cap Fund Tops Benchmark in Q3 as Investor Letter Details Stock Drivers

Managers credit health-care winners as the main driver of performance.

Overview

  • In Q3 2025, ARTMX and APDMX returned 8.80% and APHMX 8.83%, outperforming the Russell Midcap Growth Index’s 2.78% gain.
  • Top contributors included Argenx, Insmed, and Lattice Semiconductor, with Argenx’s VYVGART gaining from a new self-administered subcutaneous formulation and Insmed advancing on FDA approval of Brinsupri for non-cystic fibrosis bronchiectasis.
  • Lattice was cited for progress despite an industrial and auto inventory overhang, with management expecting destocking to finish by early 2026 and highlighting growth in AI data centers and robotics.
  • Detractors included Wingstop, Spotify, and Atlassian, as Wingstop shares fell with broader restaurant weakness despite a beat, while management pointed to smart kitchen technology cutting wait times about 40% and a 2026 loyalty program to drive engagement.
  • Portfolio moves featured new positions in ServiceTitan, Woodward, and Teledyne, plus additions to RBC Bearings, Reddit, and Veracyte, with RBC supported by a strong backlog, next-gen aircraft production ramps, and successful integration of its VACCO acquisition.