If you're considering a core bond holding for your portfolio, the Vanguard Total Bond Market Index Institutional Fund (VBTIX) is a strong contender worth a closer look. Launched in 1995 and managed by Joshua Barrickman since 2013, VBTIX offers broad exposure to the U.S. investment-grade bond market and has grown to more than $43 billion in assets. 

Over the past five years, it delivered an annualized return of -0.94%, but has shown moderate volatility, with a five-year standard deviation of 6.26%—notably lower than the category average of 12%, making it a relatively stable option. With an ultra-low expense ratio of just 0.04% and no sales load, the fund is significantly cheaper than most of its peers, though it does require a high $5 million minimum investment. 

VBTIX's beta of 1 suggests it tracks the bond market closely, while its slightly negative alpha (-0.04) reflects challenges in beating the benchmark on a risk-adjusted basis. 

Finsum: For large institutions or high-net-worth investors seeking cost-efficient, diversified bond exposure with low volatility, VBTIX could be a foundational piece of a fixed-income strategy.