MBBA vs SMBS

MBBACiShares Mortgage-Backed Securities Active ETF

SMBSASchwab Mortgage-Backed Securities ETF

In short

MBBA Active management aimed at the plumbing of the mortgage market: iShares gives a manager room to pick agency MBS instead of mirroring the Bloomberg U.S. MBS Index, and charges less than the typical fund in this corner to do it.

SMBS —No data

Stated mandate

MBBA The Fund seeks to maximize total return while generating income and applying prudent investment management.

SMBS —No data

Why people hold it

• MBBA Runs at 0.25% a year, under the 0.35% typical of MBS funds in its group. Active mandates usually charge up from the index, not down toward it.
• The mandate: maximize total return while generating income. The Bloomberg U.S. MBS Index is the yardstick, not a leash the manager has to hug bond for bond.
• Spread across roughly 500 US mortgage bonds in a plain 1940 Act open-end fund. No K-1, no derivative wrapper, no offshore structure to decode.
• Fund inception dates to 1998, meaning this mortgage playbook was running long before most of the ETFs it now sits beside existed.

SMBS —No data

Worth knowing

• MBBA Cheap for active, still pricier than the index route: MBB, VMBS and SPMB all sit at a few basis points. Here you are paying for a manager's calls.
• Because it is active, there is no tracking record to audit, and only a short window of risk history exists. Less to measure than a long-running tracker.
• Smaller and more lightly traded than the index heavyweights in the MBS category, which is where limit orders earn their keep.

SMBS —No data

Full MBBA profile⁠

Full SMBS profile⁠