Market manipulation techniques

Market manipulation techniques fall into six families: order-book manipulation, corners and squeezes, information-based schemes, issuer and structural fraud, benchmark and cross-market rigging, and crypto-native schemes. Each family is defined by what the manipulator controls — the order flow, the supply, the story, the share register, the reference price, or the protocol.

Every page explains the mechanic with a worked example, cites the statute it breaks, shows how surveillance catches it, and reports the penalties actually imposed — computed from this site's own enforcement records rather than quoted from elsewhere.

How often does a record carry a penalty?

Share of records in this library with a recorded civil penalty, by family. A record without one may be a filing whose outcome is not tracked; families with fewer than five records are left out.

Order-book manipulation

Order-book manipulation is any scheme in which the orders and trades themselves are the instrument of deception, with nothing ever said about the underlying asset.

Banging the close 3 actions

Banging the close is trading heavily during the short window used to calculate a settlement price, in order to move that settlement in favour of a much larger position that references it.
Hijacked-account ramping 4 actions

Hijacked-account ramping is using other people's brokerage accounts, accessed without their consent, to place buy orders that raise the price of a stock the perpetrator already holds, then selling into that price.
Layering 24 actions

Layering is placing multiple orders at several consecutive price levels with no intention of trading them, building an apparent wall of depth that pushes the price toward a genuine order on the other side.
Marking the close 27 actions

Marking the close is trading in the final minutes of a session specifically to move the closing price, which is the price that sets portfolio valuations, margin calls, index levels and derivative settlements.
Marking the open

Marking the open is trading into a market's opening auction or first minutes to move the official opening price, which is thinner and cheaper to influence than the close but still feeds benchmarks and guarantees.
Matched orders 166 actions

Matched orders are prearranged trades between parties acting in concert, entered so that they execute against each other at a price agreed away from the market rather than discovered in it.
Momentum ignition 1 action

Momentum ignition is entering a burst of aggressive orders designed to trigger other participants' momentum strategies, creating a price move the initiator then trades against.
Painting the tape 2 actions

Painting the tape is executing a series of transactions to create a misleading appearance of activity or of a price trend on the public trade record, in order to draw other participants in.
Price manipulation 312 actions

Price manipulation is trading intended to create an artificial price — one that does not reflect genuine supply and demand — and it is the general charge a regulator brings when the conduct does not fit a more specific named technique.
Quote stuffing

Quote stuffing is flooding a trading venue with order messages in order to slow down the processing of market data, so that competing participants act on prices that are already stale.
Spoofing 108 actions

Spoofing is placing orders a trader intends to cancel before execution, to create a false impression of supply or demand and move the price toward a smaller genuine order on the other side.
Wash trading 106 actions

Wash trading is buying and selling the same asset with no change in beneficial ownership and no market risk, so that a trade prints publicly and creates a false impression of activity or price.

Corners and squeezes

Corners and squeezes are schemes that control the supply of an asset so that participants who are obliged to buy — to close a short or make delivery — must do so at prices the controller sets.

Box squeeze

A box squeeze is holding both a long position and the lendable supply of a security, so that recalling the borrow forces short sellers to buy back at a moment and a price the holder chooses.
Cornering 3 actions

Cornering is acquiring control of the deliverable supply of an asset while holding a large long derivative position in it, so that short sellers cannot obtain the asset and must settle on the cornerer's terms.
Delivery squeeze

A delivery squeeze is controlling the certified stocks, warrants or logistics needed to satisfy a futures contract, so that short sellers cannot deliver even where the commodity exists elsewhere.
Engineered short squeeze 2 actions

An engineered short squeeze is deliberately acquiring the tradable supply of a security and withdrawing it from the lending market, so that short sellers who must cover cannot find stock and are forced to buy at the engineer's price.
Float locking 1 action

Float locking is removing shares from the freely tradable supply — through lock-ups, nominee holdings, or coordinated refusal to sell or lend — so that ordinary buying moves the price far more than the company's size would suggest.

Information-based manipulation

Information-based manipulation moves a price by changing what people believe about an asset, using false or misleading statements, undisclosed paid promotion, or fabricated documents.

Analyst manipulation 6 actions

Analyst manipulation is publishing research that does not reflect the analyst's genuine view, because the rating serves an investment banking relationship or a trading position rather than the client reading it.
Boiler rooms 68 actions

A boiler room is a high-pressure sales operation that sells securities to investors using scripted misrepresentations, converting a block of stock the operator holds into cash one call at a time.
Chat group pumps 7 actions

A chat group pump is a coordinated buying campaign organised inside a messaging group, where organisers accumulate before announcing a target and sell into the buying their announcement produces.
EDGAR filing fraud 10 actions

EDGAR filing fraud is submitting a false document through the SEC's official filing system, exploiting the authority of the system of record to move a share price before the issuer can correct it.
Fake press releases 21 actions

A fake press release is a fabricated corporate announcement issued through a wire service or a lookalike site, designed to move a share price for the few minutes before the company can deny it.
False rumours 15 actions

Spreading false rumours is seeding an untrue claim about a company into channels traders read, in order to move the price and trade against the reaction before the claim can be checked.
Misleading issuer disclosure 214 actions

Misleading issuer disclosure is a listed company, or the people running it, giving the market false, incomplete or late information about its finances, business or prospects, so that the share price rests on a picture the company knew, or should have known, was wrong.
Newsletter scalping 13 actions

Newsletter scalping is recommending a security publicly while secretly selling it into the demand the recommendation creates, so that subscribers acting on the advice become the publisher's exit.
Paid stock promotion 68 actions

Paid stock promotion is publicising a security in exchange for compensation, which is lawful only if the fact of payment, the payer and the amount are fully disclosed under Securities Act Section 17(b).
Pump and dump 139 actions

A pump and dump is a scheme in which shares are accumulated cheaply, promoted with misleading claims to drive the price up, and then sold into the demand the promotion created, leaving later buyers with the loss.
Rigged binary options execution 8 actions

Rigged binary options execution is a platform operator programming, or ordering staff to alter, the trading software so a customer's "trade" settles as a loss regardless of the real market price, because the transaction was never sent to any market at all.
Sham tender offers 15 actions

A sham tender offer is a takeover bid announced or filed by someone with no intention or means of completing it, or by a bidder who does not exist, in order to move the target's share price and trade against the move.
Short and distort 3 actions

Short and distort is taking a short position and then publishing false or materially misleading negative claims about the issuer, in order to drive the price down and cover cheaply.
Social media ramps 27 actions

A social media ramp is a coordinated posting campaign designed to drive attention and buying into a thinly traded security, so that the organisers can sell into the demand their posts created.

Issuer and structural schemes

Issuer and structural schemes manipulate the supply of shares and the corporate vehicle itself — creating shells, hiding control, and issuing stock in ways designed to be sold into a market that has been prepared for it.

Custodianship shell hijacking

Custodianship shell hijacking uses a state-court receivership process to seize control of an abandoned but still-quoted public company, then issues stock in it to the person who obtained the appointment.
Dilution death spirals

Dilution through a death spiral is a convertible instrument that converts into stock at a discount to the prevailing market price, so each conversion dilutes holders and pushes the price lower, entitling the holder to still more shares.
Free riding and parking 18 actions

Free riding and parking covers placing securities in a nominee's name while keeping the real economic interest, in order to disguise ownership, evade position limits or defeat resale restrictions.
Reverse merger schemes 25 actions

A reverse merger scheme uses the lawful mechanism of merging a private business into a public shell to obtain a listing without scrutiny, in order to distribute stock into a market prepared for it.
Shell factories 9 actions

A shell factory manufactures public companies with no real business, complete with nominee shareholders and a share quotation, for sale to promoters who need a listed vehicle to distribute stock through.
Undisclosed control blocks 93 actions

An undisclosed control block is a controlling shareholding held through nominees and offshore entities so that no individual holding crosses a reporting threshold, leaving the market with a false picture of who controls the company.
Unregistered distributions 157 actions

An unregistered distribution is selling securities to the public without registration or a valid exemption, which Securities Act Section 5 prohibits regardless of whether anyone was deceived or harmed.

Benchmark and cross-market manipulation

Benchmark and cross-market manipulation moves one price in order to profit somewhere else — distorting a reference rate, a settlement window or a cash market to change the value of positions that settle against it.

Benchmark submission rigging 34 actions

Benchmark submission rigging is skewing the figures a panel member reports into a reference rate calculation, so that the published benchmark moves in favour of positions that settle against it.
Cash versus derivatives schemes 3 actions

A cash versus derivatives scheme establishes a large derivative position and then trades the smaller underlying market at a deliberate loss, in order to move the reference price the derivative settles against.
ETF and NAV abuse

ETF and NAV abuse exploits a fund's valuation of illiquid or stale-priced holdings, creating or redeeming shares at a ratio that transfers value from the investors who remain in the fund.
FX fixing 9 actions

FX fixing manipulation is trading during the short window used to calculate a daily currency benchmark, using advance knowledge of client orders that must be executed at that fix.
Mismarking 16 actions

Mismarking is deliberately recording the value of positions or portfolio assets away from what they are worth, to hide losses, inflate a fund's reported performance or raise pay and fees, without any trade in the open market.
Options expiry pinning

Options expiry pinning is trading to hold a share price at or across an option strike at expiry, exploiting the fact that a few cents of movement decides whether large positions pay out or expire worthless.
Rule 105 offering shorts 85 actions

Rule 105 offering shorts are short sales of a stock in the restricted period before a follow-on offering is priced, followed by a purchase of that stock in the offering, which Regulation M Rule 105 prohibits whatever the trader intended.
Settlement price manipulation 5 actions

Settlement price manipulation is trading to move an official settlement price, because that price determines margin, portfolio marks and the payoff on contracts many times larger than the trading itself.

Crypto-native manipulation

Crypto-native manipulation exploits features that exist only in blockchain markets — public pending transactions, automated pricing formulas, protocol-controlled liquidity, and venues that report their own volume.

Exchange wash trading 2 actions

Exchange wash trading is a trading venue reporting volume that did not genuinely occur, or permitting others to generate it, in order to appear more liquid and rank higher than it is.
Insider listing trading 1 action

Insider listing trading is buying a token ahead of an exchange's confidential decision to list it, exploiting the sharp price rise that a major listing announcement reliably produces.
Market maker loan arrangements

A market maker loan arrangement lends token inventory to a market maker on terms tied to price or listing outcomes, creating an incentive to generate activity rather than to quote neutrally.
Oracle manipulation 1 action

Oracle manipulation moves the price source a smart contract reads, usually a shallow liquidity pool, so that a protocol values collateral wrongly and can be drained within a single transaction.
Paid crypto market making 8 actions

Paid crypto market making is a token issuer hiring a self-described market maker whose actual service is to trade the token with itself or with confederates, manufacturing volume and price support instead of quoting genuine two-sided markets.
Perpetual market spoofing

Perpetual market spoofing is placing orders on a crypto derivatives venue with no intention of trading them, on infrastructure that frequently keeps no order audit trail and may sit outside any regulator's reach.
Rug pulls 1 action

A rug pull is a crypto scheme in which the operators withdraw the liquidity backing a token, or mint unlimited new supply, leaving holders with an asset that cannot be sold at any price.
Sandwich attacks and MEV

A sandwich attack places one transaction immediately before a victim's pending swap and another immediately after it, moving the pool price so that the victim trades at a worse rate and the attacker keeps the difference.

Related but distinct

Insider trading, churning, front running, Ponzi schemes and naked short selling are frequently called market manipulation and are not, because none of them works by falsifying the price signal.

Churning 14 actions

Churning is excessive trading in a customer's account driven by the broker's commissions rather than the customer's objectives, which defrauds one identifiable person and leaves the market price untouched.
Front running 61 actions

Front running is trading ahead of a customer order to capture the price improvement that order will produce, which breaches a duty owed to that customer rather than falsifying any public price.
Hack to trade 14 actions

Hack to trade is obtaining unpublished, market-moving information by breaking into a computer system, such as a newswire, filing agent or law firm, and trading on it before release; it exploits a true signal and injects no false one into the price.
Insider trading 851 actions

Insider trading is dealing in securities on material non-public information in breach of a duty of trust or confidence, which exploits a true signal others cannot see rather than injecting a false one into the price.
Ponzi schemes 474 actions

A Ponzi scheme pays returns to earlier investors from later investors' money rather than from genuine profits, which is investment fraud with no market involvement and no price to manipulate.
The naked short selling debate 35 actions

Naked short selling is selling short without having borrowed the security or arranged to borrow it, which is restricted by Regulation SHO and whose real-world scale and price impact remain genuinely contested.