Ask-Side Hit
When an option trade executes at the ask price, it indicates that the buyer initiated the trade rather than waiting for the market to come to them. For call options, an ask-side hit is a bullish signal — someone was willing to pay full price for immediate exposure. For put options, an ask-side hit is bearish, suggesting urgency on the downside. In WHF's flow feed, ask-side hits on sweeps are among the most actionable signals because they reflect conviction, not passivity.
Accumulation
The phase where institutional investors gradually build a large position in a stock, often over days or weeks to avoid moving the price against themselves. Accumulation is frequently visible in dark pool data as repeated prints at similar price levels — the institution is methodically buying supply without triggering a breakout. When dark pool accumulation coincides with rising open interest on call options, it can signal that an institution is building toward a catalyst.
At-The-Money (ATM)
Options with a strike price equal to, or very near, the current trading price of the underlying stock. ATM options have the highest time value (extrinsic value) relative to their price and respond most directly to movement in the stock. They are also where the most speculative activity tends to cluster — and where large institutional flow at-the-money can signal that a directional move is expected soon.
Bid-Side Hit
When an option trade executes at the bid price, the seller initiated the transaction — someone was willing to accept a lower price for immediate execution. For calls, a bid-side hit is bearish (someone is selling calls, potentially unwinding a bullish position). For puts, it is bullish. Bid-side fills are more ambiguous than ask-side hits and often represent hedging or position unwinds rather than fresh directional conviction.
Block Trade
A large privately negotiated securities transaction, typically 10,000 or more shares in equities or $200,000 or more in bonds, executed away from the open market to minimize price impact. Block trades are reported to FINRA and appear on the consolidated tape, but they are negotiated bilaterally — buyer and seller agree on price and size before the trade hits the record. WHF flags block trades above $500K notional as meaningful institutional footprints.
Breakeven
The stock price at which an options position neither profits nor loses money at expiration. For a call, breakeven equals the strike price plus the premium paid. For a put, it is the strike price minus the premium. Breakeven is a useful reference point when evaluating whether an options position requires a large or realistic move to be profitable — deep OTM options with short expiries often require unrealistic breakevens, which is why near-term ATM sweeps on large premium carry more weight.
Call Option
A contract giving the holder the right, but not the obligation, to buy 100 shares of the underlying stock at a specific strike price before the expiration date. Calls profit when the stock price rises above the strike plus the premium paid. Institutional call buying — especially large sweeps on the ask side — is one of the primary signals WHF monitors as evidence of bullish smart money positioning.
Confluence
When multiple independent data signals align on the same ticker within a short time window, producing a higher-conviction setup than any single signal alone. For example: a golden sweep in call options, followed by a large dark pool print at the same price level, followed by an insider buy filed on Form 4 — all in the same week. WHF's scoring system weights these multi-signal setups heavily because coincidence across independent data streams is statistically unlikely when institutions are positioning ahead of a move.
Congressional Trade
A stock transaction by a member of the U.S. Congress, disclosed under the STOCK Act within 45 days of execution. Members of Congress sit on committees that receive advance briefings on policy, regulation, and economic conditions — giving them potential informational advantages over the public. WHF parses these disclosures daily and flags cluster activity (multiple members trading the same stock) as elevated-conviction signals.
Cluster Buying
When multiple corporate insiders or institutional participants buy the same stock within a short time window — typically days or weeks. A single insider buy can reflect personal financial planning; cluster buying by three or more officers and directors is a much stronger signal that insiders collectively believe the stock is undervalued or that a near-term catalyst is approaching. WHF monitors Form 4 filings in real time to surface cluster buy patterns as they emerge.
Dark Pool
A private exchange where institutional investors execute large block trades away from the public order books of exchanges like NYSE and NASDAQ. Dark pools exist to minimize market impact — if a hedge fund bought 5 million shares of a stock on a lit exchange, the order book would move the price against them before they finished filling. Roughly 40% of all U.S. equity volume flows through dark pools daily. Trades are reported to regulators after execution and appear on the consolidated tape, making them visible to platforms like WHF.
Dark Pool Print
A reported trade from a dark pool venue that appears on the consolidated tape after execution. Large prints — typically those above $500K in notional value — are the ones WHF tracks, as they suggest institutional conviction rather than routine rebalancing. A single large print at a key technical level (support, 52-week high, pre-earnings) is a meaningful data point. Multiple prints at similar levels over several sessions are a strong accumulation or distribution signal depending on context.
Delta
The rate of change in an option's price relative to a $1 move in the underlying stock. A delta of 0.50 means the option gains or loses $0.50 for every $1 the stock moves. Deep ITM options approach a delta of 1.0 (moving nearly dollar-for-dollar with the stock); deep OTM options have deltas near 0. Delta is also used as a rough proxy for the probability that an option will expire in-the-money — a 0.30 delta option has approximately a 30% chance of expiring ITM.
Distribution
The phase where institutions gradually sell (distribute) a large position, often at or near resistance levels. Distribution can appear in dark pool data as large prints at price levels that have historically acted as ceilings — the institution is selling into strength to minimize price impact. When dark pool distribution prints coincide with unusual put activity or heavy call selling, it can indicate that smart money is exiting ahead of a reversal.
Expiration
The date on which an options contract becomes void and can no longer be exercised. U.S. equity options typically expire on the third Friday of each month for monthly contracts, though weekly and daily expirations have grown in popularity. Options lose time value (theta) as expiry approaches — a phenomenon that accelerates in the final days. When institutions buy short-dated options (1-2 weeks out), it signals urgency rather than a long-term thesis, which is exactly the kind of conviction WHF flags.
Exercise
The act of using an options contract to buy (call) or sell (put) the underlying stock at the strike price. Most retail options traders rarely exercise; they sell the contract before expiration to capture the remaining time value. However, when large institutions exercise early — particularly ITM calls — it can signal they want actual share ownership rather than just options exposure, often a longer-term bullish sign.
FINRA
The Financial Industry Regulatory Authority, the self-regulatory organization that oversees U.S. broker-dealers and monitors dark pool reporting. FINRA requires alternative trading systems (ATS) — the regulatory category that includes dark pools — to report trade data, which is then disseminated on the consolidated tape. FINRA also publishes weekly dark pool volume reports by ATS and ticker, which are a key raw data source for platforms that track institutional off-exchange activity.
Form 4
An SEC filing required when corporate insiders — directors, officers, and shareholders owning more than 10% of a class of stock — buy or sell shares of their company. Form 4 must be filed within 2 business days of the transaction. It is the primary source for insider trading data in the U.S. and is parsed by WHF daily. Open-market purchases (not grants or option exercises) by insiders are the most informative transaction type, as insiders are voluntarily spending their own cash on the company's stock.
Flow
Short for "order flow" — the aggregate stream of buy and sell orders entering the market for a given stock or options contract. Reading flow means analyzing the balance of aggression between buyers and sellers. In options markets, flow analysis focuses on whether large trades are hitting bids (seller-initiated) or lifting offers (buyer-initiated), and whether the volume and premium are unusual relative to historical norms. Flow is the core data set that WHF's alert system is built around.
Gamma
The rate of change of delta — it measures how much an option's delta will change as the underlying stock moves $1. High gamma options (typically ATM, short-dated contracts) can see their delta change dramatically with even modest stock moves, creating outsized profit-and-loss swings. Gamma risk is also relevant at the market level: when dealers are short gamma (as they often are around large options expirations), they must buy stock as it rises and sell as it falls, amplifying market moves.
Golden Sweep
A call sweep order executed on the ask side with unusually large premium — one of the strongest bullish signals tracked in options flow. The term "golden" refers to the combination of three characteristics: it is a sweep (urgent, multi-exchange fill), it hits the ask (buyer initiated), and the premium is significantly above normal for that ticker and timeframe. WHF surfaces golden sweeps as high-priority alerts because they consistently represent institutional players making aggressive directional bets, not hedges.
Greeks
The collective term for delta, gamma, theta, and vega — the variables that measure how sensitive an option's price is to different market factors. Delta measures stock price sensitivity, gamma measures the rate of delta change, theta measures time decay, and vega measures implied volatility sensitivity. Understanding the Greeks is essential for evaluating whether an unusual options trade represents a directional bet, a volatility play, or a hedge against an existing position.
Hedge
A trade designed to offset risk in another position, not to profit directionally. A portfolio manager who owns 10 million shares of a stock might buy puts as insurance against a drawdown — not because they are bearish, but because they want downside protection. This is important context when evaluating unusual options activity: not all large put purchases are bearish directional bets. WHF helps contextualize flow by looking for additional confirming signals before treating any single trade as a directional thesis.
Implied Volatility (IV)
The market's forward-looking forecast of how much a stock will move, expressed as an annualized percentage and derived mathematically from current option prices. When options are expensive, IV is high; when options are cheap, IV is low. IV spikes before earnings announcements, binary events, or when institutions are aggressively buying options. Tracking IV relative to its historical range (IV rank and IV percentile) helps distinguish between genuinely unusual options activity and routine pre-event hedging.
In-The-Money (ITM)
Call options are in-the-money when the strike price is below the current stock price — they already have intrinsic value. Put options are ITM when the strike is above the current price. ITM options are more expensive than OTM options because they contain real intrinsic value, not just time value. Large ITM call sweeps are particularly significant because the buyer is paying a high premium for immediate economic exposure to the stock — it is not a lottery ticket; it is a high-conviction directional bet.
Insider Buy
An open-market purchase of company stock by a director, officer, or 10%+ shareholder, reported on SEC Form 4. Academic research consistently shows that insider purchases are more informative than insider sales — executives sell stock for many reasons (diversification, taxes, liquidity), but they buy with their own cash only when they believe the stock is going higher. WHF tracks Form 4 filings in real time and cross-references insider buys with options and dark pool activity on the same ticker.
LEAPS
Long-Term Equity Anticipation Securities — options contracts with expiration dates more than one year in the future, available on most major equities and ETFs. LEAPS purchased by institutions indicate a longer-term thesis rather than a short-term catalyst play. Large LEAPS call buying, especially in large notional size, is a strong signal that an institution has high conviction over a multi-month timeframe. Because LEAPS have extended duration, they are less vulnerable to short-term theta decay and require less precision on timing.
Lit Exchange
A public stock exchange — NYSE, NASDAQ, CBOE, and others — where the order book is fully visible in real time, meaning all bids and asks are displayed before a trade executes. Lit exchanges provide price discovery but expose institutional orders to front-running and market impact. The alternative — dark pools — exists specifically because large institutions need a way to trade without telegraphing their intentions on the lit tape. Understanding the distinction between lit and dark trading helps contextualize where institutional prints originate.
Market Maker
A financial firm that provides liquidity to the market by continuously quoting both bid and ask prices, profiting from the spread between them. In options markets, market makers are the counterparty to most retail and institutional options trades — when someone buys a call sweep, the market maker is typically the seller. This is important: market makers hedge their exposure by buying or selling the underlying stock (delta hedging), which means large options flow can directly drive stock price movements as market makers adjust their hedges.
Max Pain
The strike price at which the largest number of options contracts — both calls and puts combined — would expire worthless, theoretically causing maximum financial pain to option holders. The theory behind max pain is that market makers and large institutions, who are net short options, benefit when price gravitates toward the max pain strike near expiration. While max pain is not a reliable trading signal on its own, it is a useful reference for understanding where price might be "pinned" as large expirations approach, particularly in index ETFs and mega-cap names.
NBBO — National Best Bid and Offer
The best available bid and ask prices aggregated across all registered U.S. exchanges at any given moment. All broker-dealers are required to execute client orders at prices at least as favorable as the NBBO. Dark pool trades are compared against the NBBO at the time of execution to ensure they do not violate price improvement rules. For institutional flow analysts, the NBBO provides the baseline reference for evaluating whether a dark pool print occurred at a discount (accumulation) or premium (distribution) to the prevailing market price.
Notional Value
The total dollar value of a position. For options contracts, notional value equals the number of contracts multiplied by 100 (shares per contract) multiplied by the premium. For dark pool prints, it equals shares multiplied by the trade price. Notional value is the single most important filter for separating meaningful institutional activity from routine retail trading. WHF's default filter for dark pool prints is $500K notional — below that threshold, the signal-to-noise ratio drops sharply. A $5M+ notional print on a mid-cap stock is nearly always institutional.
Open Interest
The total number of outstanding options contracts for a given strike and expiration that have not yet been closed, exercised, or expired. Open interest increases when a new contract is opened and decreases when a contract is closed or expires. Rising open interest alongside rising volume at a specific strike suggests new positions are being established — not just existing positions changing hands. WHF watches for unusual spikes in open interest at specific strikes as evidence that institutional players are building new directional positions.
Options Chain
The complete listing of all available options for a stock, organized by expiration date and then by strike price, showing both calls and puts with their respective bids, asks, volumes, open interest, and Greek values. Reading an options chain fluently is foundational to flow analysis — it provides the context needed to evaluate whether a specific trade is unusually large relative to available open interest, and whether the strike and expiration chosen suggests a near-term catalyst or a longer-term thesis.
Out-of-the-Money (OTM)
Call options are out-of-the-money when the strike price is above the current stock price — they have no intrinsic value and consist entirely of time value and volatility premium. Put options are OTM when the strike is below the current price. OTM options are cheaper, offering higher percentage leverage, but they require a larger move to become profitable. Large OTM call sweeps — particularly those far OTM with short expiration — are high-risk bets that often signal either a specific catalyst in mind, or speculative activity rather than institutional conviction.
Premium
The price paid to buy an options contract, representing the total cost per share (multiplied by 100 for the full contract cost). Premium is composed of intrinsic value (how deep ITM the option is) plus extrinsic value (time value and implied volatility). When institutions pay elevated premium — above the normal ask — to acquire options quickly, it signals urgency. WHF uses premium size as a primary filter: large premium sweeps ($100K+ per trade, $500K+ total) are the most actionable flow signals.
Put Option
A contract giving the holder the right, but not the obligation, to sell 100 shares of the underlying stock at a specific strike price before expiration. Puts profit when the stock price falls below the strike minus the premium paid. Large put sweeps on the ask side are bearish signals in WHF's flow feed — they indicate an institution is urgently acquiring downside exposure, which can precede sector rotation, hedging ahead of bad news, or outright short thesis execution.
Put/Call Ratio
The volume of put options traded divided by call volume over a given period, used as a sentiment indicator. A ratio above 1.0 means more puts than calls are trading, suggesting bearish positioning or elevated hedging demand. A ratio below 0.7 suggests bullish sentiment with more call activity. Extreme readings in either direction can be contrarian signals — when everyone is hedging with puts, the market may be near a bottom; when call buying is euphoric, a top may be near. WHF tracks put/call ratios by sector and by individual name.
Sweep Order
An aggressive order type that routes simultaneously across all available exchanges to get filled as quickly as possible at the best available prices, rather than waiting for a single exchange to fill the entire order. A sweep in options flow means the buyer or seller wanted to be in the trade immediately, at any cost, rather than working a limit order passively. This urgency is a key signal — sweeps suggest the trader had a reason not to wait, which is often because they expected the stock to move before a passive order would fill.
Smart Money
A term for institutional investors, hedge funds, proprietary trading desks, and other sophisticated market participants whose size and information advantages give their trades directional predictive value. "Following the smart money" is the core thesis behind WHF — by tracking the data footprint of institutional activity (options flow, dark pool prints, Form 4 filings, congressional disclosures), retail traders can position alongside informed participants rather than trading against them.
STOCK Act
The Stop Trading on Congressional Knowledge Act, signed into law in 2012, which requires members of Congress and their staff to disclose securities transactions within 45 days of execution. The law was passed after documented evidence that members of Congress were trading stocks in industries subject to legislation they were actively working on. WHF parses STOCK Act disclosures in real time and flags cluster trading patterns — when multiple members from both parties trade the same ticker, it suggests the trade may be based on shared knowledge from committee work.
Strike Price
The price at which an options contract holder can buy (call) or sell (put) the underlying stock. The relationship between the strike price and the current stock price determines whether an option is in-the-money, at-the-money, or out-of-the-money. Strike selection in unusual options activity is highly informative — institutions targeting a specific strike near a resistance level or earnings catalyst reveal their price target and conviction. WHF's flow alerts always include the strike, expiration, and whether the trade was ITM, ATM, or OTM at the time of execution.
Theta
Time decay — the rate at which an option's price decreases each day as it approaches expiration, all else being equal. Theta is always negative for option buyers (it works against them) and positive for option sellers (it works in their favor). A theta of -0.05 means the option loses $5 per day in time value. Theta decay accelerates in the final 30 days before expiration and is particularly punishing in the last week. When large institutions buy short-dated options despite high theta, it signals they expect a near-term catalyst to overcome the time decay drag.
Tape
The consolidated record of all securities transactions — the "ticker tape" of buy and sell activity across exchanges, including dark pool reports. "Reading the tape" is the practice of analyzing trade-by-trade data to understand the balance of supply and demand in real time, watching for large prints, unusual patterns, and aggressive order flow. WHF's alert system is built on tape reading at institutional scale — automatically parsing millions of transactions per day to surface the ones that matter.
Unusual Options Activity (UOA)
Options trading volume that significantly exceeds the normal baseline for a particular stock, strike, and expiration — often defined as volume at least 3x to 5x the average daily volume for that contract. UOA is the primary screener used by WHF to identify institutional positioning before it becomes public knowledge. Not all UOA is actionable — some is routine hedging or earnings-driven speculation — but UOA that combines high volume, ask-side execution, large premium, and short-to-medium expiration is among the highest-quality setups in flow analysis.
Vega
The sensitivity of an option's price to changes in implied volatility. A vega of 0.10 means the option gains or loses $10 for every 1-point change in IV. Long options (calls or puts) always have positive vega — they benefit from rising volatility and are hurt by falling IV. When institutions buy options ahead of a binary event (earnings, FDA decision, regulatory ruling), they are often buying vega as much as they are buying direction. WHF distinguishes between vega-driven institutional buying and pure directional flow when contextualizing alerts.
Volume
The total number of options contracts or shares traded in a given time period. Volume alone is not a signal — it must be evaluated relative to context: is today's volume 2x average or 20x average? Is it concentrated at a single strike, or spread across the chain? Is it occurring in the first hour of trading (often reactive) or mid-session (often deliberate)? WHF's flow engine normalizes volume against each ticker's historical baseline, flagging only activity that clears meaningful thresholds of unusualness relative to the stock's own history.
Whale
An institutional investor, hedge fund, sovereign wealth fund, or large proprietary trading desk executing trades large enough to potentially move markets. The term is used loosely in retail trading communities to describe any participant whose order size dwarfs typical retail activity — typically $500K or more in a single trade. WHF was built around one thesis: whales leave tracks. By systematically monitoring the four primary data streams where institutional activity is disclosed — options markets, dark pools, SEC Form 4 filings, and STOCK Act disclosures — WHF surfaces those tracks in real time.