Yeah Baby! 'SHAG' ETF Draws Millions of Assets to Short-Term Bonds

The SHAG ETF, a US short-term aggregate bond fund, has grown from $5 million to $80 million in assets over two years, thanks to its catchy ticker and rising interest rates. It tracks a Bloomberg Barclays Index and holds 425 investment-grade bonds with durations under five years to manage interest rate risk. The fund's bonds are mostly US-based, with a significant portion in corporates and US government bonds. Despite trailing the Bloomberg Barclays US AG index, SHAG offers a competitive yield and has an expense ratio of 12 basis points. It is rated positively in the Bloomberg Intelligence Traffic Light system.

What percentage of the ETF's holdings are rated triple A or single A?

What is the expense ratio of the Shag ETF, and what does it indicate?