Series 57 common mistakes
Series 57 · Understand the traps and how to avoid them.
Marks a sale 'long' because a customer or affiliate account holds the shares, or because the shares were purchased but not yet delivered, even though the shares are borrowed, pledged, or subject to a lien.
Candidates memorize the three Reg SHO marks (long, short, short exempt) as labels attached to order types instead of applying the underlying ownership test, so any presence of shares in the firm's books gets treated as 'long.'
What to do instead
Apply a two-part test before every mark: (1) does the selling account own the security outright, and (2) is it free of any restriction such as a borrow, loan, or lien? A bona fide purchase made for delivery against the sale can support 'long'; a purchase that depends on borrowed shares cannot. Drill with cash, margin, pledged, and locate-backed positions.
Invokes the bona fide market-making exception to skip a locate on every sale coming out of a proprietary account, including hedging, riskless principal, and position liquidation trades.
Rule 203(b)(2)(i) is read as a blanket proprietary-trader exception because the words 'market maker' appear in it, and candidates never ask whether the desk actually satisfies the bona fide market-making standard in that security.
What to do instead
Before relying on the exception, define the activity: is the desk continuously quoting both sides and bearing market risk in that security? If not, obtain a locate. Remember the exception never cures Rule 204 close-out failures and does not override Rule 201. Write the test out in one sentence and apply it to each fact pattern.
Treats a security's appearance on the threshold list as a one-time flag, and closes out a fail casually or one settlement day late.
The threshold-list criteria and the close-out clock are studied as two separate facts, so candidates cannot connect them into a timeline, and they default to the old T+2 assumption.
What to do instead
Reconstruct the timeline in order: fails of 10,000+ shares for five consecutive settlement days puts the stock on the threshold list; then close out the fail no later than the settlement date (currently T+1) and pre-borrow before any further short sale until the fail is closed. Rehearse with a date table rather than memorizing numbers in isolation.
Answers a trade-through question by describing best execution (or answers a best-execution question by citing Rule 611), and assumes Rule 611 protects manual quotes and depth beyond the top of book.
Both concepts sit in the same study block and both sound like 'getting a good price,' so the candidate collapses them into one idea instead of asking which rule the fact pattern actually triggers.
What to do instead
Keep two one-line tests: Rule 611 asks 'am I trading through a displayed, automated top-of-book quotation without an exception?' Best execution asks 'did I use reasonable diligence to get the best terms for this order, weighing price, speed, size, and likelihood of execution?' Classify the question first, then answer only that rule.
Trades for the firm's own account ahead of an unexecuted customer order in the same security on the same side, reasoning that the rule only bars stepping ahead at a better price or only covers limit orders sitting in the book.
The candidate reduces FINRA Rule 5320 to 'don't front-run limit orders,' missing that the prohibition keys on the firm having knowledge of a customer order in the same security and side, subject only to narrow exceptions.
What to do instead
Check the elements mechanically: customer order, same security, same side, order still executable, firm trading ahead. Then ask whether a listed exception applies (for example an ISO, no knowledge, or customer consent) and require documentation. Note the exception in the answer rather than assuming it.
Assumes pre-trade financial risk controls are required only for sponsored or direct market access customers, so the desk's own automated proprietary order flow goes out with no price, quantity, or credit checks.
Market access is mentally filed under 'customer connectivity,' and candidates never connect Rule 15c3-5 to the firm's own electronic trading, even though the rule governs all market access.
What to do instead
Memorize the control set and its scope: pre-set credit/capital thresholds, orders that do not comply with regulatory requirements, erroneous order prevention (price and quantity parameters), and duplicate order prevention, plus the CEO-equivalent certification and at least annual review. State explicitly that the rule applies to every order path, including proprietary flow.
Applies a single percentage band to every stock and every time of day, and assumes a limit-state pause means the stock is closed until the next session.
The LULD plan's moving parts (price tiers, time-of-day doubling, limit state versus straddle state, five-minute pause, reopening auction) are flattened into one memorized percentage because the candidate never builds the grid.
What to do instead
Build the band table explicitly: price tier by tier, the percentage above and below the reference price, and the doubling that applies in the last 25 minutes of regular trading. Then add the mechanics: limit state triggers a five-minute pause, the primary listing exchange reopens with an auction, and the stock is tradable again after reopening.
Designates an order as an ISO after the fact, or routes through a protected quotation while marking only the order as ISO and not the resulting executions.
The candidate treats the ISO as a label that excuses any trade-through, rather than as a status that must be correct at routing time and carried through to each execution.
What to do instead
Walk the ISO fact pattern end to end: the order is genuinely not displayed, it routes to execute against the displayed quotation of another market center, it is marked ISO when routed, and every resulting execution is marked ISO. If any leg is missing, treat the trade as a Rule 611 trade-through rather than an exception.
Assumes the short sale price test is triggered by any 10% decline, lasts only for the remainder of that day, and that the market maker exception permits every short sale in a restricted security.
Rule 201's trigger, duration, permitted price, and exceptions are memorized as separate bullet points, so the candidate cannot apply them to an order arriving at a specific bid.
What to do instead
State the chain: trigger is a 10% intraday decline from the prior closing price; the restriction runs for the rest of that day and the following day; short sales are permitted only at a price above the current national best bid (or at any price if the best bid is zero) unless an exception applies; the bona fide market-making exception is narrow. Then check the bid at the moment of the order.
Concludes that a market maker may decline to execute an incoming order because the order is larger than the displayed quotation, or that the quotation is firm for unlimited size.
The word 'firm' is read as 'always' rather than 'firm for the displayed price and size, and at least a normal unit of trading,' so the candidate cannot separate firm-quote obligations from price improvement and exception handling.
What to do instead
Restate the obligation precisely: a displayed quotation is firm for the price and displayed size for orders presented to the member, with a minimum normal unit of trading (100 shares for NMS stocks). Price improvement is permitted and does not breach the obligation. Then test the fact pattern against size first, price second.