GRAIL INC Dominates Paul Isaac's Portfolio

Arbiter Partners' Paul Isaac maintains a heavily concentrated portfolio as of December 31, 2025, with GRAIL INC leading at 47.7% allocation.

By AI Generated.Mar 2, 2026, 5:36 PM
GRAIL INC Dominates Paul Isaac's Portfolio

Top Holdings by Value

Paul Isaac's portfolio at the end of 2025 shows a clear preference for specific companies. GRAIL INC (GRAL) stands out as the largest holding, accounting for 47.7% of the portfolio with a value of $88.6 million. This is followed by COREBRIDGE FINANCIAL INC (CRBG) at 4.38% and SHINHAN FINANCIAL GROUP-ADR (SHG) at 3.99%, both in the Financial Services sector. Other significant positions include STEREOTAXIS INC (STXS) at 3.57%, SONIDA SENIOR LIVING INC (SNDA) at 3.18%, CBL & ASSOCIATES PROPERTIES (CBL) at 2.39%, and OSISKO DEVELOPMENT CORP (ODV) at 1.76%.

High Sector Concentration

The portfolio demonstrates a notable concentration in the Healthcare sector, primarily driven by GRAIL INC's massive allocation. Healthcare represents approximately 51.6% of the total portfolio value, combining GRAIL INC's 47.7% and STEREOTAXIS INC's 3.57%, along with contributions from SONIDA SENIOR LIVING INC (3.18%) and other smaller holdings. This represents a significant tilt towards companies operating in the life sciences and healthcare technology space.

Recent Changes in Holdings

Several holdings show significant changes from the previous period, indicating active management. COREBRIDGE FINANCIAL INC (CRBG) saw its share count increase by 43.15%, suggesting a strategic addition or reinforcement of this position. Similarly, CBL & ASSOCIATES PROPERTIES (CBL) experienced a substantial 24.52% increase in shares, pointing to a potential conviction in the real estate sector, specifically in this REIT. Conversely, SONIDA SENIOR LIVING INC (SNDA) saw a sharp decline of 16.46% in its share count, reflecting a reduction in exposure. OSISKO DEVELOPMENT CORP (ODV) also showed a massive increase of 175.84% in shares, highlighting a significant new investment in the basic materials sector.

Investment Strategy Focus

The investment strategy appears to favor concentrated positions, particularly in the Healthcare sector through GRAIL INC and STEREOTAXIS INC. The inclusion of companies from Financial Services (COREBRIDGE, SHINHAN, NAVIENT), Real Estate (CBL), and Basic Materials (OSISKO, TFPM) suggests diversification across different growth areas, though the portfolio remains heavily weighted towards Healthcare. The active management, evidenced by the significant changes in share counts for several holdings, indicates a dynamic approach focused on capitalizing on specific opportunities, as reflected in the changes in portfolio percentages for these companies.

GRAIL INC Dominates Paul Isaac's Portfolio | InsiderSet