Series 57 — Securities Trader Qualification Examination Cheat Sheet
Last revised: September 28, 2026
Cheat sheet: FINRA Series 57 reference for securities trading rules, order handling, Reg NMS, Reg SHO, reporting, settlement, and conduct.
Use the tables for a quick pre-exam check. Expand a topic’s notes for explanations, examples, and additional distinctions.
Scope and study context
High-yield exam pattern: expect scenario questions where the correct answer turns on capacity, order type, market center, quote protection, short-sale status, reporting duty, or prohibited trading conduct.
If the question asks…
First identify…
Then apply…
Can the trader execute?
Held vs not held, agency vs principal, customer vs proprietary
Best execution, customer priority, Reg NMS, firm procedures
Execution time, facility, modifiers, cancel/correct process
Trade reporting rules plus books and records
Scan the tables first. Identify weak areas quickly.
Turn each trap into a rule. The exam often tests small distinctions, not broad definitions.
Practice immediately after review. Use original practice questions and topic drills while the concepts are fresh.
Review explanations, not just scores. For Series 57, a missed question usually means you misread order status, capacity, timing, price protection, or reporting responsibility.
Item
Review Point
Provider
FINRA
Official title
Series 57 — Securities Trader Qualification Examination
Official code
Series 57
Core focus
Trading activities, order handling, market rules, trade reporting, books/records, settlement, and prohibited conduct
Candidate mindset
Think like a registered trader who must handle orders correctly, avoid manipulation, report trades accurately, and follow market-structure rules
Best study method
Combine rule review with independent companion practice, original practice questions, topic drills, and detailed explanations
Trader workflow
flowchart TD
A[Receive order or trading instruction] --> B[Identify security, account, capacity, session]
B --> C{Customer order?}
C -->|Yes| D[Apply best execution, priority, limit display, confirmations]
C -->|No / proprietary| E[Check information barriers, restricted lists, capital/risk limits]
D --> F{Long, short, or short exempt?}
E --> F
F -->|Short| G[Locate, mark short, check Reg SHO Rule 201]
F -->|Long / not short| H[Check NBBO, protected quotes, order terms]
G --> H
H --> I{Execution route}
I -->|Exchange / ATS / market maker| J[Execute or route under order instructions]
I -->|ISO / special handling| K[Confirm exception conditions and records]
J --> L[Trade report, CAT/order event, books and records]
K --> L
L --> M[Clearance, settlement, corrections, supervisory review]
Market structure quick map
Item
Exam-use meaning
Traps
NMS stock
Exchange-listed equity security subject to Regulation NMS
Do not confuse with OTC equity securities that are not exchange-listed
OTC trade in an NMS stock
Trade executed otherwise than on an exchange, usually reported through a FINRA trade reporting facility
Execution venue and reporting venue are different concepts
OTC equity security
Equity security not listed on a national securities exchange
Generally reported through ORF, not an NMS-stock TRF
Exchange
National securities exchange with rules, order book, members, and protected quotations when conditions are met
Not every displayed interest is a protected quotation
ATS / ECN
Broker-dealer trading system matching buyers and sellers under regulatory conditions
May affect routing, access, and order handling; not the same as a national securities exchange
Market maker
Dealer that stands ready to buy/sell for its own account by quoting
Principal capacity; firm quote and anti-backing-away rules matter
Agency trade
Broker acts for customer and earns commission
Customer priority and best execution are central
Principal trade
Dealer buys/sells for its own account and charges markup/markdown
Fair pricing and disclosure issues arise
Riskless principal
Dealer receives customer order, offsets in market, then fills customer
Still requires accurate capacity, reporting, confirmation, and fair pricing treatment
Sponsored/direct market access
Customer or trader accesses market using broker-dealer market participant ID
SEC market access controls remain the broker-dealer’s responsibility
Notes and examples
Core Market Structure Vocabulary
Term
Cheat Sheet
Broker-dealer
Firm that may act as agent, principal, or riskless principal depending on the transaction
Agent
Executes on behalf of a customer and earns commission/fee
Principal
Trades from or into the firm’s own account, usually with markup/markdown considerations
Riskless principal
Firm receives a customer order, executes offsetting principal trade, then fills the customer order; still requires correct reporting and disclosure treatment
Market maker
Dealer that stands ready to buy/sell a security for its own account, subject to quote and conduct rules
Exchange
Registered marketplace where listed securities trade under exchange rules
ATS/ECN
Alternative venue that may display or execute orders electronically
OTC equity
Equity security not listed on a national securities exchange; reporting and quotation rules differ from listed/NMS securities
NMS stock
Equity security covered by Regulation NMS, generally exchange-listed securities
NBBO
National best bid and offer; important but not the only best-execution factor
Protected quotation
Automated, accessible top-of-book quotation protected under Reg NMS trade-through rules
Trade-through
Execution at an inferior price while a protected better-priced quotation is available, unless an exception applies
Locked market
Bid equals offer
Crossed market
Bid is higher than offer
Halt/pause
Trading may be stopped or paused; orders and executions must follow venue and regulatory requirements
Order types and time-in-force
Order
Core rule
Exam trap
Market order
Execute promptly at best available price
Execution certainty, not price certainty
Limit order
Buy at or below limit; sell at or above limit
Price protection creates execution risk
Marketable limit
Limit order immediately executable against current market
Can still cap price slippage
Stop order
Becomes market order once stop price is elected
Stop price is not guaranteed execution price
Stop-limit order
Becomes limit order once stop price is elected
May not execute after election
Buy stop
Usually entered above current market
Often used to cover shorts or enter breakout
Sell stop
Usually entered below current market
Often used to protect long position
Not-held order
Broker has time and price discretion
Does not permit discretion over security, side, or quantity unless separately authorized
Held order
Broker expected to seek prompt execution under terms
Delay can create best-execution and priority issues
IOC
Immediate-or-cancel: execute available quantity, cancel rest
Partial execution allowed
FOK
Fill-or-kill: execute entire order immediately or cancel
No partial execution
AON
All-or-none: execute full size or not at all
Not necessarily immediate
Day
Expires at end of trading day/session as defined
Watch extended-hours instructions
GTC / open
Remains open until canceled or expired under firm/venue rules
Must be monitored for corporate actions and changes
ISO status is not a blanket exemption from best execution or accurate marking
Reserve / iceberg
Displays part of total size
Displayed vs hidden size affects priority and quote obligations
Pegged order
Price tied to NBBO, midpoint, or other reference
Sub-penny, locking/crossing, and repricing rules matter
Notes and examples
Common order wording traps
Phrase in question
Usually means
Do not confuse with
“Stopped order”
Customer is guaranteed a price by broker/dealer
Stop order
“Short exempt”
Short sale order exempt from Rule 201 price test
Exempt from locate requirement
“Held”
Prompt handling expected
Discretionary trading authority
“Not held”
Time/price discretion
Permission to change security, side, or quantity
“At the market”
Market-priced execution
Guaranteed NBBO execution
“Away market”
Another venue has relevant interest
Permission to ignore protected quotes
Order Type Cheat Sheet
Order Type
What It Means
Exam Trap
Market order
Buy or sell immediately at best available price
Guarantees execution priority, not execution price
Limit order
Buy at or below limit; sell at or above limit
Guarantees price limit, not execution
Buy limit
Buy no higher than stated price
Entered below current market when seeking a lower price
Sell limit
Sell no lower than stated price
Entered above current market when seeking a higher price
Stop order
Becomes a market order when stop price is triggered
Trigger price is not guaranteed execution price
Stop-limit order
Becomes a limit order when triggered
May not execute if market moves through the limit
Buy stop
Typically placed above market to cover shorts or enter on breakout
Triggered when price rises to stop
Sell stop
Typically placed below market to protect long position or enter on breakdown
Triggered when price falls to stop
Day order
Valid for current trading day unless executed/canceled
Do not assume it carries forward
GTC
Remains active until executed or canceled, subject to firm/venue rules
Corporate actions and firm policies may require adjustment/review
IOC
Immediate-or-cancel; execute available quantity immediately, cancel rest
Partial execution allowed unless combined with other restriction
FOK
Fill-or-kill; execute entire order immediately or cancel
No partial execution
AON
All-or-none; execute full size or not at all
Not necessarily immediate unless paired with immediate instruction
Not held
Trader has price/time discretion
Not unlimited discretion; must still use reasonable judgment and follow instructions
Held
Broker expected to seek immediate execution under order terms
Less discretion than not held
Discretionary order
Broker has discretion over price/time/quantity/action, depending on authority granted
Requires proper authorization and handling
Odd lot
Less than round lot size
May receive different display/protection treatment than round lots
Mixed lot
Round lot plus odd-lot portion
Know how display/execution may differ by venue
Best execution, customer priority, and trading ahead
Rule / concept
What to know
Exam application
FINRA best execution
Use reasonable diligence to determine best market for the security and execute so customer price is as favorable as possible under prevailing conditions
Best price is important but not the only factor; consider size, speed, liquidity, volatility, accessibility, and order terms
Regular and rigorous review
Firms must review execution quality of venues and routing arrangements
Payment for order flow does not excuse poor execution
Customer priority
Customer orders generally receive protection ahead of firm proprietary trading
Watch scenarios where firm trades for itself while holding an executable customer order
FINRA Rule 5320 / Manning
Prohibits trading ahead of customer orders in a way that disadvantages the customer
Common exceptions include no-knowledge units, certain institutional/large order consent, riskless principal treatment, and valid ISO-related handling
FINRA Rule 5270
Prohibits trading ahead of customer block transactions when the firm has material non-public market information about the block
Applies to proprietary and related-account trading; focus on knowledge of imminent block activity
FINRA Rule 5280
Restricts trading ahead of research reports
Advance knowledge of research can be material and non-public
Limit order protection
A customer limit order can restrict firm proprietary trading at the same or better price
Do not confuse with Reg NMS trade-through protection
Information barriers
Separate trading units may rely on no-knowledge controls only if barriers are effective and documented
“The firm knew” and “the trading unit knew” can be different if controls are valid
Regulation NMS rapid reference
Regulation NMS item
Practical meaning
High-yield distinction
NBBO
National best bid and offer across relevant protected quotations
NBBO is not every quote in every system
Protected quotation
Automated, displayed quotation at the best price from a protected market center for an NMS stock
Hidden orders and many odd-lot interests are not treated the same as protected round-lot quotes
Rule 611: Order Protection Rule
Prevents trade-throughs of protected quotations unless an exception applies
Allows execution while sender routes to better protected quotes
Sender must meet ISO obligations; receiver must properly treat ISO marking
Self-help exception
Trading center may bypass a venue experiencing problems after proper steps
Not a casual “slow market” excuse
Flickering quote exception
Addresses rapidly changing quotations
Must fit rule conditions; not general permission to ignore NBBO
Stopped order exception
Customer receives a guaranteed price meeting rule conditions
Not the same as a stop order
Benchmark / VWAP exception
Certain benchmark-priced trades may be excepted
Still requires correct reporting and documentation
Rule 610
Access to quotations; locked/crossed market restrictions
Do not intentionally display quotes that lock or cross protected quotes unless an exception applies
Rule 612
Minimum pricing increments for NMS stocks
Sub-penny pricing restrictions are separate from tick-size economics
Rule 605
Execution quality public reporting
Venue quality review input
Rule 606
Order routing disclosures
Payment for order flow and routing conflicts are disclosure and supervision issues
Notes and examples
Trade-through examples
NBBO
Proposed execution
Issue
20.10 bid / 20.12 offer
Buy at 20.13
Trade-through unless exception; protected 20.12 offer is better
20.10 bid / 20.12 offer
Sell at 20.09
Trade-through unless exception; protected 20.10 bid is better
20.10 bid / 20.12 offer
Buy ISO at 20.13
Potentially permitted if ISO conditions and routing obligations are satisfied
20.10 bid / 20.12 offer
Buy at 20.12
At protected offer; no trade-through on price
Regulation NMS Cheat Sheet
Rule / Concept
What It Tests
Rule 611 Order Protection Rule
Prevents trade-throughs of protected quotations unless an exception applies
Protected quotation
Automated, accessible best bid or offer from a protected market center
Trade-through
Execution at inferior price while protected better price is available
Intermarket sweep order
ISO may execute while simultaneously routing to better protected quotations, if requirements are met
Rule 612 Sub-penny Rule
Limits quoting/pricing increments for NMS stocks; know the basic penny/sub-penny distinction
Rule 610 Access
Addresses fair access and access fees to quotations
Locked/crossed markets
Market participants generally must avoid intentionally locking or crossing protected quotations
Self-help
Market center may bypass another market center experiencing problems if conditions are met
LULD / volatility controls
Limit Up-Limit Down and trading pauses are designed to prevent executions outside permitted bands
Reg NMS Decision Rules
Question
If Yes
If No
Is the security an NMS stock?
Reg NMS may apply
Look to other applicable OTC/FINRA/venue rules
Is there a better protected quote?
Trade-through issue possible
Rule 611 issue less likely
Is the better quote automated and accessible?
More likely protected
May not be protected
Is an exception present?
Execution may be permitted
Trade-through likely problematic
Was the order marked/routed as ISO?
Sender/receiver obligations matter
Normal routing/protection analysis applies
Reg NMS Traps
A better price is not always a protected quotation.
Protected quotations generally refer to top-of-book automated quotes, not every order in the book.
An ISO is not a magic label; the routing party must satisfy ISO responsibilities.
A trade can be poor execution even if it avoids a technical trade-through.
Sub-penny rules affect quoting and order entry; permitted executions may have special exceptions.
Regulation SHO short-sale workflow
Step
Required analysis
Exam trap
1. Determine position
Is the seller long, short, or deemed to own?
A trader cannot mark long merely because the firm expects to buy later
2. Mark order
Mark sell order long, short, or short exempt as applicable
Short exempt relates to price-test restrictions, not general short-sale exemption
3. Locate
Before accepting/effecting most short sales, broker-dealer must have reasonable grounds to believe the security can be borrowed for delivery
Locate is generally pre-trade; close-out is post-fail
4. Check Rule 201
If price test restriction is triggered, short sales in covered securities generally must be priced above the current national best bid unless exempt
Trigger is based on a significant decline from prior close; restriction continues for the required period
5. Monitor fails
Fails to deliver require close-out under Reg SHO timing and process rules
Market-maker status does not automatically eliminate close-out obligations
6. Document
Retain locate, marking, execution, and exception records
Good outcome does not cure missing documentation
Notes and examples
Long vs short sale marking
Seller status
Proper marking tendency
Notes
Owns shares and broker reasonably expects delivery by settlement
Long
Ownership plus deliverability matters
Does not own shares
Short
Locate generally required before execution
Owns convertible or exchangeable security but has not completed steps for delivery
Depends on rule conditions
Do not assume convertible ownership equals deliverable common stock
Long in one account, short in another
Depends on aggregation and account rules
Independent trading unit treatment requires conditions
Short sale during Rule 201 restriction with valid exception
Short exempt
Must be properly marked and supported
Short Sale Decision Path
flowchart TD
A[Proposed sell order] --> B{Does seller own or is seller deemed to own the security?}
B -- Yes --> C{Reasonable expectation of delivery by settlement?}
C -- Yes --> D[Mark long]
C -- No --> E[Mark short]
B -- No --> E[Mark short]
E --> F{Locate required or exception available?}
F -- Locate obtained / exception applies --> G{Rule 201 price test triggered?}
F -- No locate --> H[Do not effect short sale]
G -- Yes --> I[Apply short sale price restriction unless short exempt]
G -- No --> J[May execute subject to other rules]
I --> K[Monitor fails and close-out obligations]
J --> K
Reg SHO Core Concepts
Rule / Concept
Cheat Sheet
Long sale marking
Seller must own or be deemed to own the security and reasonably expect delivery by settlement
Short sale marking
Required when seller does not own or cannot reasonably deliver by settlement
Short exempt marking
Used only when a valid exception from the short sale price test applies
Locate requirement
Before effecting a short sale, broker-dealer generally must have reasonable grounds to believe the security can be borrowed for delivery
Easy-to-borrow list
Can support locate if reasonable, current, and properly maintained
Hard-to-borrow
Heightened attention; do not assume shares are available
Bona fide market making
Certain exceptions may apply, but only for genuine market-making activity
Rule 201 circuit breaker
Short sale price restriction may apply after a significant intraday decline in an NMS stock
Close-out requirement
Fails to deliver must be closed out under required timing rules
Threshold securities
Persistent fails can trigger additional scrutiny and consequences
Reg SHO Traps
Trap
Correction
“The customer says they are long, so mark long automatically.”
The order can be marked long only if ownership/deemed ownership and delivery expectation requirements are met.
“Short exempt means no locate is needed.”
Short exempt generally relates to price-test restrictions, not the locate requirement.
“A locate guarantees delivery.”
A locate is a reasonable belief before execution; delivery/fail issues can still arise.
“Market makers are exempt from all short sale rules.”
Exceptions are limited and tied to bona fide market-making activity.
“Rule 201 bans all short sales.”
It restricts execution price for covered short sales when triggered; exceptions may apply.
“Fails are only back-office issues.”
Fails can create trading restrictions and regulatory issues.
Limit orders, quote display, and firm quote duties
Topic
Rule logic
Scenario clue
Customer limit order display
Display eligible customer limit orders that improve the quote or add size at the best price unless an exception applies
Customer buy limit above current bid; customer sell limit below current offer
Display exceptions
Common categories include customer instruction not to display, block/institutional handling, certain all-or-none or odd-lot treatment, and immediately executable orders
Exceptions require conditions; do not assume “large” always means exempt
Firm quote rule
Market maker must be prepared to trade at its published quote up to displayed size, subject to valid exceptions
Refusing after quoting can be “backing away”
Locked market
Bid equals offer
Generally avoid displaying a quote that locks a protected quote
Crossed market
Bid higher than offer
Stronger warning sign; check venue and Reg NMS exceptions
Research downgrade known internally before publication; trader sells firm inventory
Trading ahead of research / MNPI concern
Late or inaccurate trade report discovered
Submit proper correction/cancel/as-of process and preserve records
Final review checklist
Before exam day, be able to answer quickly:
Which market center or reporting facility applies?
Is the security an NMS stock, OTC equity, debt instrument, option, or security future?
Is the order held, not held, market, limit, stop, stop-limit, IOC, FOK, AON, or ISO?
Is the trade agency, principal, or riskless principal?
Is a customer order being disadvantaged by proprietary trading?
Is there a protected quote that would be traded through?
Is the order long, short, or short exempt, and was a locate required?
Does Rule 201 restrict short-sale execution price?
Does the fact pattern involve MNPI, research, offering activity, or a customer block?
Is the trade report separate from CAT/order-event reporting?
Are books, records, timestamps, corrections, and supervisory evidence preserved?
Series 57 — Securities Trader Qualification Examination Cheat Sheet
This independent quick review is for candidates preparing for FINRA’s Series 57 — Securities Trader Qualification Examination using the official exam code Series 57. It is designed for fast review before moving into topic drills, mock exams, and detailed explanations.
Use it to reinforce the rules and decision points that tend to drive exam questions: order handling, market structure, short sales, trade reporting, best execution, prohibited trading conduct, and settlement/recordkeeping basics.
MasteryExamPrep is independent and is not affiliated with FINRA. Always use current FINRA materials and rule text as your primary reference.
Assuming execution, confirmation, clearing, and settlement are the same event
Prohibited conduct
Spot spoofing, layering, wash trades, marking the close, front-running, rumor trading, and manipulation
Focusing only on customer harm instead of market integrity
Order Handling Decision Checklist
When a question gives an order scenario, ask in this order:
Whose order is it? Customer, proprietary, institutional, market maker, or another broker-dealer?
What capacity is the firm using? Agency, principal, or riskless principal?
What are the order instructions? Market, limit, stop, not held, IOC, FOK, AON, short sale, discretionary?
Is the order marketable? Can it execute against current bid/offer?
Is a better protected quotation available? Reg NMS trade-through analysis may apply.
Is a customer order being held? Check trading-ahead and limit-order-protection issues.
Is it a short sale? Check order marking, locate, price test, and close-out implications.
Where did it execute? Determines trade reporting responsibility and facility.
What must be recorded/reported? Time, price, size, capacity, modifiers, and order lifecycle details.
Is there suspicious conduct? Look for manipulation, front-running, collusion, or false quoting.
Best Execution: High-Yield Rules
Best execution is not a single-price rule. A firm must use reasonable diligence to obtain a favorable execution under prevailing market conditions.
Factor
What to Remember
Price
Important, but not the only factor
Speed
Especially relevant for marketable orders and fast-moving securities
Likelihood of execution
A displayed price may be less useful if size/access is limited
Size
Large orders may require special handling
Market depth
More than the top quote can matter
Volatility
Execution strategy may change in fast markets
Accessibility
A better quote that cannot realistically be accessed may not produce best execution
Cost
Fees/rebates may be considered, but cannot justify poor execution by themselves
Customer instructions
Specific instructions can limit the firm’s discretion
Regular review
Firms must review execution quality, not just handle each order in isolation
Notes and examples
Best Execution Traps
Trap: “The NBBO was met, so best execution is automatically satisfied.” Correction: NBBO is important, but best execution also considers speed, size, likelihood, market conditions, and order instructions.
Trap: “Payment for order flow is prohibited in all cases.” Correction: The issue is not simply whether payment exists; the firm must still meet disclosure and best-execution obligations.
Trap: “A not-held order eliminates all obligations.” Correction: Not-held gives discretion, but the trader must still act consistently with instructions and reasonable market judgment.
Trap: “Best execution applies only to retail orders.” Correction: Customer order handling and execution quality remain core concepts across order types, with facts and instructions mattering.
Customer Limit Orders and Trading Ahead
Customer Limit Order Display
A customer limit order that improves a firm’s quote or adds size at the quoted price may need to be displayed unless an exception applies. The exam may test whether the firm must display, route, execute, or otherwise protect the order.
Situation
Review Point
Customer buy limit better than current bid
May improve displayed bid
Customer sell limit better than current offer
May improve displayed offer
Customer limit at current quote but adding size
May need to be reflected in displayed size
Customer requests no display
Potential exception if properly handled
Not-held or special-handling order
Check facts carefully; display treatment may differ
Institutional/large-size context
Exceptions may apply, but do not assume automatically
Notes and examples
Trading Ahead / Customer Order Protection
A firm generally cannot trade for its own account at a price that would satisfy a held customer order without properly executing or protecting the customer order.
Concept
Exam Meaning
Trading ahead
Firm prioritizes its own account over a customer order it is holding
Customer protection
Customer should receive execution when firm trades at a price that would satisfy the customer’s order, unless an exception applies
No-knowledge exception
May apply when separate trading units do not know of the customer order and information barriers are proper
Large/institutional exceptions
May apply under specific conditions; do not assume unless facts support it
Riskless principal
Still must be handled and reported properly; does not erase customer protection duties
Quotes, Market Makers, and Firm Quote Duties
Concept
Review Point
Bid
Price at which a market participant is willing to buy
Offer/ask
Price at which a market participant is willing to sell
Spread
Difference between offer and bid
Size
Number of shares associated with quote
Firm quote
Market maker may be obligated to execute at its displayed quote up to displayed size, subject to rules/exceptions
Backing away
Failing to honor a firm quote without valid reason
Quote update
Quotes must be updated or withdrawn when no longer valid
Two-sided quoting
Market makers may have obligations to maintain continuous two-sided quotes depending on venue/security
Stub quote
Quote far away from market; can raise regulatory concerns if not compliant
Locked/crossed quote
Can signal market-data, routing, or compliance issue