How SBLOC providers differ: what to compare.

• i
  Rate basis and spread. Every SBLOC quotes a rate built from two parts — a reference rate that moves with the market, and a fixed margin the provider adds on top. The margin is usually tiered, stepping down as the borrowed balance rises, so a headline number quoted at one loan size may not be the rate you pay at another. Compare the benchmark, the spread over it, and the tier schedule together; only the combination tells you the effective cost. For how the reference-rate-plus-spread structure works in detail, see how pricing works.
• ii
  Minimums and eligible assets. Providers set a minimum facility or account size that gates who can borrow, and each draws its own boundary around eligible collateral — which markets, which security types, and which holdings it will lend against at all. A position one provider accepts, another may exclude entirely. Establish both the entry threshold and the eligibility of your actual holdings before comparing anything else; the general shape of these thresholds is set out in the SBLOC minimum requirements.
• iii
  Advance rate. The advance rate — the cash a provider will lend per dollar of collateral — is not a single figure but a function of what you pledge. Broad, liquid, low-volatility holdings are advanced toward the upper end; concentrated, thinly traded, or volatile positions toward the lower end, and some are declined. Illustratively, loan-to-value across this instrument sits within a 20% to 65% band, calibrated to the position rather than published as a rate card. Ask for the advance rate on each holding, and specifically how a concentrated single-stock position is treated.
• iv
  Maintenance and call terms. This dimension often matters more than price. It governs how much cushion sits between the loan and the value of the collateral, what happens when a decline erodes that cushion, how much notice you are given, and whether a shortfall is met by posting cash or by the provider selling pledged securities at its discretion. Two facilities at an identical rate can behave very differently in a falling market. Compare the call trigger, the notice period, and the resolution mechanics side by side.
• v
  Draw and repayment flexibility. Some facilities are revolving lines you can draw and repay at will, holding an undrawn reserve at no interest; others behave more like fixed-term loans with set drawdown and repayment schedules. Look for whether repayment is flexible or fixed, whether prepayment carries a penalty, whether an unused portion attracts a fee, and whether the line can be renewed or must be refinanced at term. Flexibility has a cost and a value; weigh both against how you intend to use the facility.
• vi
  Custody and account movement. Where the pledged securities are held shapes your control and your counterparty exposure. Some providers lend only against assets already custodied with them and require you to move the account; others take a pledge over securities held elsewhere, leaving custody with your existing institution. Establish whether a transfer is required, who holds the securities while they are pledged, and how the arrangement is insulated from the lender’s own credit.
• vii
  Purpose restrictions. Some SBLOC facilities carry a non-purpose restriction — the proceeds may be used for anything except buying or carrying more securities — while others offer a purpose or securities-buying option that permits it, typically under different regulatory and margin treatment. If you intend to redeploy the proceeds into markets, confirm which option a provider offers before assuming the facility can be used that way.

Run the same six-line checklist against every provider and the field becomes genuinely comparable. One caveat sits underneath the whole exercise: standard SBLOC providers are built for diversified, freely traded holdings, and their eligibility rules, advance rates, and call terms reflect that. For concentrated, restricted, insider, or cross-border positions that standard providers advance thinly or decline outright, the bespoke institutional route applies — negotiated advance rates, an optional non-recourse profile, and terms calibrated to the specific position rather than a standard grid. That is the discipline set out in securities-backed lending.