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Trading glossary
Trade Blotter vs Trade Book: Glossary for Broker and Desk Teams
A trade blotter is an itemised record of trades in the order they are executed. For US broker-dealers, SEC Rule 17a-3(a)(1) requires "Blotters (or other records of original entry)". A trade book usually shows the positions built from those trades, and a ledger holds the accounting entries. Firms use these terms differently, so check your procedures.
In brief
What is a trade blotter?
Three records sit between an order and the final accounts. Here is what the trade blotter, the trade book and the ledger each hold, when they change and who relies on them.
Key takeaways
- SEC Rule 17a-3(a)(1) requires the US broker-dealers it covers to keep blotters, or other records of original entry, with an itemised daily record of purchases and sales of securities, receipts and deliveries of securities, cash receipts and disbursements, and other debits and credits.
- SEC Rule 17a-4(a) requires those blotters and ledgers to be kept for at least six years, the first two in an easily accessible place. FINRA Rule 4511(b) sets six years for FINRA records with no other specified period.
- A trade book shows open positions and exposure. Neither SEC Rule 17a-3 nor FINRA Rule 4511 defines the term, so firms set its meaning in their own procedures.
- The ledger records balances and postings, so it usually updates after the blotter and the book.
- Definitions and duties depend on the firm's registration and jurisdiction. Check your own regulator and internal policy.
Trade blotter, trade book and ledger compared
People in broker and desk teams often use the trade blotter, the trade book and the ledger as if they were one record. They are not. Each has a different job, a different update rhythm and a different set of users. Keeping them apart makes it easier to trace a trade from the order to the final account.
The table sets out the three terms as working definitions. Only the blotter description follows rule text, from SEC Rule 17a-3(a)(1). The trade book and ledger rows describe common practice, so check them against your firm's procedures.
| Record | What it holds | When it is updated | Who relies on it |
|---|---|---|---|
| Trade blotter | An itemised daily record of purchases and sales, receipts and deliveries of securities, cash receipts and disbursements, and other debits and credits | As each trade is executed and recorded, in time order | Operations and compliance teams |
| Trade book | Open positions and exposure built from trades, by desk, account or instrument | Through the trading day as fills and positions change | Traders, desk heads and risk managers |
| Trading ledger | Accounting entries and balances, including cash, commissions and customer accounts | After trades are booked and posted, often in batches or at period close | Finance, operations and auditors |
The blotter description follows SEC Rule 17a-3(a)(1). The other cells are industry conventions, not rule text. Check your firm's procedures and the rules that apply to it.
What SEC Rule 17a-3 says about the trade blotter
In the US, SEC Rule 17a-3 applies to exchange members and registered broker-dealers. Paragraph (a)(1) requires "Blotters (or other records of original entry)" containing an itemised daily record of all purchases and sales of securities, all receipts and deliveries of securities, all receipts and disbursements of cash and all other debits and credits. The regulatory blotter is therefore wider than a list of trades.
The same paragraph says what each purchase or sale entry must show. In summary:
- Account: "the account for which each such purchase or sale was effected".
- Securities: "the name and amount of securities".
- Price: "the unit and aggregate purchase or sale price, if any".
- Trade date: the trade date of each purchase or sale.
- Other party: the name or other designation of the person the securities were bought or received from, or sold or delivered to.
Security-based swaps carry extra fields under the same paragraph, such as the date and time of execution and the unique transaction identifier. Paragraph (a)(2) then requires ledgers reflecting all assets and liabilities, income and expense and capital accounts, and paragraph (a)(3) requires ledger accounts itemising each customer account. Read the current rule text on eCFR and confirm the fields with your compliance function before you design a process.
How long these records are kept
For the blotter itself, SEC Rule 17a-4(a) sets the period. Records made under Rule 17a-3(a)(1) through (3), which include blotters and ledgers, must be kept for not less than six years, the first two years in an easily accessible place. Other record types carry different periods.
FINRA Rule 4511 sets the general duty for FINRA members. Members must make and preserve the books and records that FINRA rules, the Exchange Act and the applicable Exchange Act rules require. Where no period is specified under those rules, paragraph (b) requires at least six years for those FINRA records. Retention is a compliance decision for the firm, so use this section to understand the terms rather than to set a policy.
Worked example: from two fills to a trade book position
This is an illustrative example, not a recommendation. A desk buys 500 units of an instrument in two fills: 300 units at 50.10 and 200 units at 50.12. The example uses round numbers and ignores fees, so it shows the record flow rather than a real trade.
The blotter keeps the two fills as separate itemised entries, each with its time, price and quantity. The trade book shows one long position of 500 units. The average price is (300 x 50.10 + 200 x 50.12) / 500 = 25,054 / 500 = 50.108, so the book carries an average cost of 50.108 per unit before fees.
The ledger then records the cash effect, which is 500 x 50.108 = 25,054 in the account currency, before commissions and posting rules. The exact entries depend on the firm's accounting system. The example shows why one order can leave three different records behind.
Where each record sits in the order-to-ledger flow
An order is sent, filled and then recorded. In many firm processes the fill creates a blotter entry first. The position in the trade book changes next, and the ledger posts the accounting effect later. The diagram on this page shows that sequence as a flow with one stage per record.
The order types that generate these fills change the timing and the price, so check them before you read the blotter. For the limit side of that picture, see what is a limit order. For the order-handling side of a platform, see order management, and for the wider terminal context see what is a trading terminal.
How RTX5 product pages relate to these records
RTX5's order management and trading ledger pages describe capabilities that are in development. Neither page should be read as a released trade blotter feature. This page explains the three terms in general, and it does not describe any RTX5 output.
Before you rely on any RTX5 function for record-keeping, check the product-availability record. It lists the status of each product and client, and it is the reference for what is live.
Risk disclosure
- Terminology differs between firms. Confirm which record your procedures call the blotter, the book and the ledger, and use the same names across systems.
- The US points on this page summarise SEC Rules 17a-3 and 17a-4 and FINRA Rule 4511 as read on 9 November 2026. Rules change, and other jurisdictions set their own record-keeping rules, which this page does not summarise.
- Record-keeping is a compliance obligation for the regulated firm. This page is educational and is not legal or compliance advice.
- A blotter entry records that a trade was booked. It does not, by itself, confirm settlement or the counterparty's record. Reconciliation with those records is a separate step.
- The worked example uses illustrative numbers. It is not a recommendation to trade or to hold any position, and trading can lose money.
RTX5 status
RTX5 is Orrnn's trading terminal and broker-technology product. Its Windows desktop client is in preview, and the web and mobile clients are planned. A Google Play listing for Android is published, but the mobile client has no approved release record yet; check the product-availability record and release notes before relying on any RTX5 feature. RTX5 is not a broker and does not hold client money, and this page does not describe a trade blotter feature.
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Primary references
Sources were checked on 9 November 2026. They explain market rules and concepts; they do not certify RTX5 or provide individual financial advice.
FINRA Rule 4511: Books and records requirementsParagraph (a) requires members to make and preserve books and records as required under FINRA rules, the Exchange Act and applicable Exchange Act rules. Paragraph (b) sets at least six years for FINRA records where no period is specified. Page checked 9 November 2026.17 CFR 240.17a-3: Records to be made by certain exchange members, brokers and dealers (govinfo, CFR 2025 edition)Paragraph (a)(1) requires "Blotters (or other records of original entry)" and lists the fields each purchase or sale entry must show. Paragraphs (a)(2) and (a)(3) cover ledgers and customer ledger accounts. Checked 9 November 2026.17 CFR 240.17a-4: Records to be preserved (govinfo, CFR 2025 edition)Paragraph (a) requires records made under Rule 17a-3(a)(1) through (3) to be preserved for not less than six years, the first two years in an easily accessible place. Checked 9 November 2026.RTX5 product availabilityRTX5 status record. Use it to check which RTX5 products and clients are live before relying on any feature.
Questions readers ask
What is a trade blotter?
A trade blotter is an itemised record of trades in the order they are executed. For US broker-dealers, SEC Rule 17a-3(a)(1) treats blotters as records of original entry and requires each purchase or sale to show the account, the securities, the price, the trade date and the other party. Other firms and jurisdictions may use the term differently, so confirm it with compliance.
What is a trade book?
A trade book is an operating view of a desk's positions and exposure, built from the trades recorded during the day. Traders and risk managers use it to see what is open and at what average price. Neither SEC Rule 17a-3 nor FINRA Rule 4511 defines the term, so firms set its meaning in their own procedures. It does not replace the blotter or the ledger.
Is a trading ledger the same as a trade blotter?
No. A blotter lists trades in the order they were executed. A ledger records accounting entries and balances, such as cash, commissions and customer accounts. The two records serve different purposes and are kept apart, so reconciling them is a separate control that firms set in their own procedures.
How long must a broker-dealer keep a trade blotter?
In the US, SEC Rule 17a-4(a) requires records made under Rule 17a-3(a)(1) through (3), which include blotters and ledgers, to be kept for not less than six years, the first two years in an easily accessible place. FINRA Rule 4511(b) sets six years for FINRA records with no other specified period. Confirm the periods that apply to your firm with its compliance function.
Does RTX5 have a trade blotter feature?
This page does not claim one. RTX5 is Orrnn's trading terminal and broker-technology product. Its Windows desktop client is in preview, and the web and mobile clients are planned. A Google Play listing for Android is published, but the mobile client has no approved release record yet. Check the product-availability record for the current status of any order or ledger function before you rely on it.
Keep learning
What is a trading terminal?What a trading terminal does, and where order and account records sit within it.Order managementRTX5's order-management page, which is in development. Read it for status, not as a released feature.Trading ledgerRTX5's trading-ledger page, which is in development. It describes planned funds records.What is a limit order?How a limit order sets a maximum buy or minimum sell price, and how fills are recorded.What is trading?The basics of trading instruments, orders and risk, including the trading hub.