Beginners in Stock Trading
Bid, ask, spread
- What the bid-ask spread actually represents, mechanically
- Why the spread is wider in some stocks than others
- How market orders, limit orders, and stop orders interact with the spread
- The simple rule that prevents most spread-related trading losses
This is Day 10. Yesterday we introduced Jesse Livermore. Today we look at the layer of the market he watched most closely — the actual price action on the order book.
WHAT THE SPREAD ACTUALLY IS
We touched on this on Day 8. The bid is the highest price any buyer is currently willing to pay. The ask (also called the offer) is the lowest price any seller is willing to accept. The spread is the gap between them.
For a heavily-traded stock like Apple, the spread is typically 1 cent. Apple might be quoted as bid $245.30, ask $245.31. If you place a market order to buy, you pay $245.31. If you place a market order to sell, you receive $245.30. The 1-cent difference goes to whoever was sitting on the order book providing liquidity — usually a market maker.
For a less heavily-traded stock, the spread can be much wider. A small-cap stock priced at $8.50 might have a bid of $8.45 and an ask of $8.55 — a 10-cent spread, which is 1.2% of the stock's price. If you buy at the ask and immediately sell at the bid, you've lost 1.2% before the stock has moved a penny.
For an OTC penny stock, the spread can be 5–10% or more. A stock priced at $0.40 might have a bid of $0.38 and an ask of $0.42 — a 10% spread. This is one of the structural reasons we don't feature penny stocks in this newsletter: the spread alone wipes out most reasonable trading edges.
WHY SPREADS VARY
The spread reflects two things: how much demand for liquidity exists in a stock, and how much uncertainty there is about the stock's true value.
Heavy trading activity attracts market makers, because the firm that posts the tightest bid-ask spread captures the most order flow. With dozens of market makers competing for the same flow, spreads compress to almost nothing. Apple, Microsoft, and other megacap stocks routinely have penny spreads — five-thousandths of one percent of price.
Light trading activity drives market makers away. There's not enough order flow to make tight quoting profitable, so market makers either don't quote at all or quote with wider spreads to compensate for the risk of holding inventory. The stock's spread widens in proportion.
Uncertainty also widens spreads. If a stock is about to report earnings tonight, market makers know the price could move significantly when the news comes out. They widen their quotes to protect themselves from being "picked off" by traders with better information about the impending move. This is why spreads often widen in the minutes before an earnings release and the moments after.
In normal market conditions, you can use spread width as a rough proxy for liquidity:
| Spread (% of price) | Liquidity tier |
|---|---|
| Under 0.05% | Megacap, fully liquid |
| 0.05% to 0.25% | Large-cap, normal liquidity |
| 0.25% to 1.0% | Mid-cap or thinly-traded large-cap |
| 1.0% to 3.0% | Small-cap; use limit orders |
| Over 3.0% | Avoid for active trading |
ORDER TYPES AND THE SPREAD
The order type you choose determines how the spread affects you.
Market order: instructs your broker to fill at the best available price right now. If buying, you pay the ask. If selling, you receive the bid. You always cross the spread. Market orders are appropriate when (a) the stock is liquid (tight spread) and (b) you need certainty of execution.
Limit order: instructs your broker to fill only at a specified price or better. If you place a limit-buy at the bid, you don't cross the spread — but you also don't fill until a seller comes down to your price. You might wait minutes, hours, or never. Limit orders are appropriate when (a) the stock has a wider spread (small-cap, mid-cap) or (b) you have time and want a better entry.
Stop order: a conditional order that converts to a market order when a trigger price is hit. A stop-loss at $46.50 means: "if the stock trades down to $46.50, sell at the next available price." When the stop triggers, you cross the spread (you fill at the bid). In fast-moving markets, the actual fill price can be considerably below the trigger price — this is called slippage, and it's the dark side of stop orders we'll cover in Month 5.
Stop-limit order: a stop that converts to a limit order rather than a market order. Theoretically safer (no slippage), but with the trade-off that the order might not fill at all if the price moves through the limit too fast. For volatile stocks, stop-limit can leave you holding a position you intended to exit.
THE ONE RULE THAT PREVENTS MOST SPREAD-RELATED LOSSES
For BiST readers, here's the rule that handles 95% of spread-management decisions:
If the stock has a spread under 0.10% of its price, market orders are fine. If the spread is wider than that, use a limit order at or just inside the bid (when buying) or just inside the ask (when selling).
That's the whole rule. For Apple, Costco, NVDA, Microsoft — all the megacaps that dominate the IBD 50 — market orders are essentially free of spread cost. For mid-caps and small-caps, take 30 seconds to check the spread before placing the order, and use a limit if it's wider than 0.10%.
The traders who get burned by spreads are the ones who don't realize the spread exists — they place a market order in a thinly-traded stock and discover they paid 2% over the bid. Once you know to look for the spread, you stop being that trader.
The cost of any single trade is small. The cost of being unaware of the cost, compounded across 200 trades a year, is not.
A whipsaw day ended split: tech pulled the Nasdaq back into the green, while the Dow slumped more than 1%, as traders juggled oil-spiking Iran headlines and a Fed that showed no clear hand.
| S&P 500 | 7,482.71 (-0.28%) |
| Nasdaq | 25,870.65 (+0.20%) |
| Dow | 52,348.39 (-1.09%) |
Wednesday's close: the Nasdaq recovered as the Dow lagged.
What drove it: It was a headline-driven session. Oil soared and stocks dropped early after the U.S.-Iran ceasefire broke down, then pared losses when President Trump cast doubt on full-scale conflict. Per Investor's Business Daily, the Nasdaq swung to a win as Nvidia, Dell, and other tech names rose, while the Dow fell more than 1%. The afternoon's Fed minutes showed officials split on which way rates go next, offering no clear signal. Days like this reward staying calm: the tape zig-zagged, but the market's larger uptrend is still intact.
Today's lesson was about the spread, the hidden cost of trading, and why it punishes you most in thin, illiquid stocks. On a whipsaw day like this one, that lesson had teeth, which makes Dell a fitting Spotlight.
Dell Technologies · DELL · $431.97 (+3.52%) · Market cap ~$279 billion · Listed on the NYSE · Tech hardware / AI servers
Dell was one of the day's winners, rising 3.52% to $431.97 as tech pulled the Nasdaq back into the green. Here is the lesson tie-in: Dell is one of the most heavily-traded large stocks in the market, which means its bid-ask spread is usually a penny or two, a rounding error on a $430 stock. On a chaotic, headline-driven day, that liquidity is a gift. You can get in or out instantly, at a fair price, without the spread taking a bite. Now picture the same whipsaw in a thin small-cap with a 2% spread: every nervous trade would cost you 2% just to cross the spread, before slippage, before the stock even moved. That is a big reason the names we teach you to trade live on the major exchanges with deep liquidity. Dell, up more than 200% over the past year on booming demand for its AI servers, is exactly that kind of name: a leader you can actually trade cheaply.
- Price: $431.97 at Wednesday's close, up 3.52% on the day
- Market cap: about $279 billion
- 52-week range: $110.22 to $469.47 (up roughly fourfold from the low)
- Year to date: up more than 200%, driven by demand for its AI servers
- Liquidity: heavily traded, so the bid-ask spread is typically a penny or two, today's lesson made real
- Listed on: the NYSE (ticker DELL)
This is the spread lesson made practical. The cost of the spread is invisible until it is not, and it bites hardest in exactly the thin, illiquid names beginners are tempted to chase. Dell shows the other side: a deeply liquid leader where the spread is almost nothing, so your edge comes from the trade itself, not from fighting the cost of getting in. Trade where the liquidity is.
Tomorrow we cover market hours — when stocks trade, why pre-market and after-hours sessions are riskier than regular hours, and the regulatory boundaries that shape your day.