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CFA Level II Exam · Guidance for Standard II: Integrity of Capital Markets

Standard II(B): Market Manipulation Explained for CFA Level II

Updated 7 October 2026 · Fact-checked

Standard II(B) says members and candidates must not engage in practices that distort prices or artificially inflate trading volume with intent to mislead market participants. Test each case for two things: a distorting act (false information or manipulative trades) and intent to mislead. Legitimate strategies without that intent do not violate it.

Understand Standard II(B): Market Manipulation

Standard II(B) protects the integrity of capital markets. Prices and volumes are signals. Investors use them to decide what to buy and sell. If someone fakes those signals, other participants make decisions on false information.

The Standard has one key idea: intent to mislead. A trade or a statement that moves prices is not a violation by itself. It becomes manipulation when the purpose is to distort prices or volume, or to give a false impression of market activity.

The Handbook describes two broad groups. Information-based manipulation means spreading false or misleading information to move prices. Examples: rumors started to push a stock up or down, or false statements about a company. Transaction-based manipulation means trading that distorts price or volume. Examples: placing trades to create an artificial price, or trading to create the appearance of activity that does not reflect real supply and demand.

The Standard does not ban large trades, short selling, or strategies that affect prices as a side effect. A block purchase that lifts a price because demand rises is normal. The line is crossed when the aim is to mislead. Also, a member can breach this Standard by acting through others, so do not assume that using a third party gives protection.

On the exam, you will read a vignette describing a person's actions and be asked whether a violation occurred and why. Focus on what was done, what the purpose appears to be, and whether others would be misled.

Key formulas to remember

Core test for a violation
Violation = distorting act (false information or manipulative transaction) + intent to mislead market participants
Both parts must be present. A price effect alone is not enough.
Information-based manipulation
Spreading false or misleading information to influence prices or volume
Includes rumors designed to move a price.
Transaction-based manipulation
Trades that distort the price or artificially inflate trading volume, or create a false impression of activity
Judged by purpose, not by the size of the trade.
Legitimate activity
Trades or strategies with a valid economic purpose and no intent to mislead are permitted
Large trades, hedging and genuine analysis can move prices without violating the Standard.

How to solve Standard II(B): Market Manipulation questions

Use the same sequence for any Standard II(B) item. Work from the vignette facts, not from your opinion of the person.

  1. 1Identify the action: is it a statement or information release, or is it a trade or order?
  2. 2Decide the category: information-based (false or misleading information) or transaction-based (trades that distort price or volume).
  3. 3Look for intent: does the vignette show a purpose to mislead, such as moving the price to benefit a position or creating false activity?
  4. 4Check for a legitimate purpose: is there a real economic reason such as hedging, rebalancing, a client mandate or genuine analysis?
  5. 5Check whether the information is accurate and supported. Honest, well-founded opinions are different from rumors.
  6. 6Decide: violation if distorting act plus intent to mislead; no violation if the activity is legitimate.
  7. 7If asked for the action to take, pick the option that stops the conduct, avoids misleading the market and follows the Code and Standards.

Quickest way: Two-question screen

When to use it: Use when time is short and the options are three short statements about whether a violation occurred.

  1. Ask: was the aim to mislead others about price, volume or value?
  2. If yes, and there is a false rumor or a distorting trade, choose violation.
  3. If the aim is a real economic goal (hedge, client order, honest research), choose no violation.
  4. Eliminate options that call a violation based only on trade size or price movement.

Common mistakes in Standard II(B): Market Manipulation

  • Treating any trade that moves the price as manipulation

    Candidates focus on the outcome rather than the purpose.

    Fix: Look for intent to mislead. Price impact from genuine demand is normal market behavior.

  • Thinking only trading can be manipulation

    The word market makes people think of orders only.

    Fix: Remember information-based manipulation: false rumors and misleading statements also violate II(B).

  • Calling honest analysis a violation because it moved the price

    Candidates confuse accurate, well-supported research with spreading rumors.

    Fix: Check whether the information is accurate and has a reasonable basis. Accurate research is not manipulation.

  • Confusing II(B) with II(A) Material Nonpublic Information

    Both sit under Integrity of Capital Markets and both involve information.

    Fix: II(A) is about acting or causing others to act on material nonpublic information. II(B) is about distorting prices or volume to mislead.

  • Assuming using a third party avoids responsibility

    Candidates think the member did not personally trade or publish.

    Fix: Arranging for others to spread rumors or place distorting trades still breaches the Standard.

Worked examples

Example 1

Vignette: Analyst Rao holds a large long position in a thinly traded small-cap stock. He posts unverified claims on social media that the company is about to win a major contract, which he has no evidence for. The price rises 9% over two days, and he sells part of his holding. Questions: (1) Which category of manipulation is this? (2) Did Rao violate Standard II(B)? (3) What is the key fact supporting your answer?

Show the solution
  1. Action: Rao released claims, not trades, to move the price. So the category is information-based manipulation.
  2. Content: the claims are unverified and he has no evidence, so the information is false or misleading.
  3. Intent: he holds a long position, spread the claims, then sold into the rise. This shows purpose to benefit from a distorted price.
  4. Both parts of the test are met: a distorting act and intent to mislead.

Answer: (1) Information-based manipulation. (2) Yes, Rao violated Standard II(B). (3) He spread unverified claims to lift the price of a stock he held and then sold into the rise, showing intent to mislead.

Example 2

Vignette: Portfolio manager Lim manages a pension mandate. To rebalance, she must buy a large block of a mid-cap stock over three days. The purchases push the price up 3%. She places orders at normal market prices based on the mandate and does not publicize anything. A colleague says the trades manipulated the market. Questions: (1) Did Lim violate Standard II(B)? (2) Why does the price rise not decide the answer?

Show the solution
  1. Action: Lim is placing trades, so the question is whether they are transaction-based manipulation.
  2. Purpose: the trades follow a client mandate to rebalance. This is a real economic reason.
  3. Intent: no sign she aims to create a false price or false volume, and she spreads no information.
  4. Effect: the 3% rise comes from genuine demand. A price effect alone does not prove manipulation.

Answer: (1) No, Lim did not violate Standard II(B). Her trades have a legitimate purpose and no intent to mislead. (2) Price impact from genuine demand is not manipulation; the Standard turns on intent to distort or mislead.

Exam tips

  • In every II(B) item, find the words that show purpose, such as to boost, to create the appearance of, or to profit from. Those signal intent.
  • Sort each case into information-based or transaction-based before reading the options.
  • Be careful with options that say a violation occurred only because the price moved or the trade was large. These are usually wrong.
  • If the vignette shows a real client or hedging reason and no false information, expect no violation.
  • When the question asks what the member should do, choose the answer that stops the misleading conduct and does not rely on a third party to do it.

Standard II(B): Market Manipulation in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Standard II(B): Market Manipulation: frequently asked questions

What is the difference between information-based and transaction-based manipulation?

Information-based manipulation spreads false or misleading information to move prices, such as a baseless rumor. Transaction-based manipulation uses trades that distort price or volume, or create a false impression of activity. Both breach Standard II(B) when done with intent to mislead.

Is a trade that moves the market price always manipulation?

No. Large trades often move prices because of genuine supply and demand. The Standard is breached when the purpose is to distort prices or volume or to mislead others.

How is market manipulation different from a legitimate trading strategy?

A legitimate strategy has a real economic purpose, such as hedging, rebalancing or acting on honest research. Manipulation involves an intent to mislead market participants. The test is purpose, not the price effect.

How does Standard II(B) differ from Standard II(A)?

II(A) concerns material nonpublic information and not acting or causing others to act on it. II(B) concerns practices that distort prices or trading volume to mislead. One is about misuse of information, the other about misleading the market.