Chapter 7 One-Pager: Trading Markets

For the Active Trader: You already know how to execute trades on TSLA, PLTR, and other favorites. This chapter is about understanding the plumbing behind those trades—where your orders actually go, who's on the other side, and how everyone gets paid. This knowledge is SIE exam gold.

The Big Picture: Where Do Your Trades Actually Go?

When you click "Buy 100 shares of TSLA" on your brokerage app, your order enters a complex ecosystem. The SIE wants you to understand this ecosystem. 

                        SECONDARY MARKET
                              |
        ┌──────────┬──────────┬──────────┐
        |          |          |          |
    1st MARKET  2nd MARKET  3rd MARKET  4th MARKET
        |          |          |          |
    Exchanges    OTC       OTC for      Dark Pools
   (NYSE/Nasdaq) Unlisted   Listed      (Institutions)
        |          |          |          |
      TSLA      Penny      Your TSLA   Fidelity sells
      PLTR      Stocks     could trade  1M AAPL shares
      AMD       Bonds      here too!    to Vanguard

Primary Market = IPOs (remember when PLTR went public at $10?)
Secondary Market = Everything after—where you trade daily

The Four Markets Cheat Sheet

Market What Trades How It Works Real-World Example
1st (Exchanges) Listed stocks, options Auction (NYSE) or Negotiated (Nasdaq) Your TSLA shares on Nasdaq
2nd (OTC) Unlisted stocks, ALL bonds Dealer-to-dealer negotiation That sketchy penny stock, Treasury bonds
3rd (OTC of Listed) Exchange-listed securities ECNs compete with exchanges Better fill on PLTR through an ECN
4th (Institutional) Large blocks Dark pools, direct trades BlackRock moving $50M in NVDA

Key Exam Traps:

  • Almost ALL bonds trade OTC (Second Market)—even Treasuries
  • Options trade on exchanges (Cboe, PHLX)—NOT OTC
  • Third market = competition for exchanges (this is why you sometimes get price improvement)
  • Dark pools = no public quotes until after execution

NYSE vs. Nasdaq: Know the Difference

Feature NYSE Nasdaq
Type Auction Market Negotiated Market
Who runs it DMM (Designated Market Maker) Multiple Market Makers
Per stock ONE DMM assigned MANY market makers competing
Your stocks Legacy companies, some ETFs TSLA, PLTR, AMD, NVDA, most tech
Why This Matters

More market makers = more competition = tighter spreads (usually). That's why Nasdaq-listed tech stocks often have penny-wide spreads.

Broker vs. Dealer: The Money Question

This is HEAVILY TESTED. You need to know this cold.

Broker (Agent) Dealer (Principal)
Role Matchmaker Counterparty
Inventory None Holds securities
Risk Zero Market risk
Compensation Commission Markup/Markdown
Think of it as Real estate agent Used car dealer

The Hidden Profit Rule (EXAM FAVORITE)

A firm CANNOT charge BOTH commission AND markup on the same trade.

  • Acting as agent? → Commission
  • Acting as principal? → Markup/markdown
  • Both? → PROHIBITED (hidden profit)

Markups, Markdowns & The Spread

As a trader, you know the bid-ask spread. Here's what's happening behind it:

Market Maker Quote: Bid $99.90 / Ask $100.10
                         |
            ┌────────────┴────────────┐
            |                         |
    You SELL at $99.90         You BUY at $100.10
    (maybe minus markdown)     (maybe plus markup)
            |                         |
    Dealer buys from you       Dealer sells to you

The spread ($0.20) is the dealer's potential profit.

When you're trading TSLA with a $0.01 spread, the market is liquid and competitive. When you see a $0.50 spread on some illiquid OTC stock, that's the cost of thin markets.

FINRA's 5% Policy (It's NOT What You Think)

Common misconception: "Markups can't exceed 5%"
Reality: 5% is a guideline, not a hard cap

The actual standard: "Fair and reasonable"

Exam Exceptions:

  • Mutual funds: Max 8.5% sales charge (not 5%)
  • Municipal bonds: MSRB rules, not FINRA (but similar standard)

Dark Pools & After-Hours Trading

Dark Pools:

After-Hours Trading Risks — Remember "LWV":

You've probably seen TSLA move 5% after earnings in pre-market. That volatility is exactly what the SIE wants you to understand.

Quick-Fire Definitions

Term Definition Remember It
DMM Designated Market Maker (NYSE) ONE per stock
ECN Electronic Communication Network Competes with exchanges
ATS Alternative Trading System Umbrella term (includes ECNs, dark pools)
CQS Consolidated Quotation Service Shows best prices across venues
Consolidated Tape Reports trades after execution The scrolling ticker on CNBC
OCC Options Clearing Corporation Guarantees exchange-traded options ONLY
SRO Self-Regulatory Organization Exchanges police themselves (under SEC)

Exam Question Patterns

"Which market..."

"Who regulates..."

"How is a _____ compensated?"

"What's prohibited?"

Connect to Your Trading Experience

What You Know SIE Concept
Price improvement on fills Third market ECNs competing with exchanges
Tight spreads on TSLA Multiple Nasdaq market makers competing
Wide spreads on penny stocks Illiquid OTC (Second Market)
Earnings moves in pre-market After-hours trading volatility risk
Options on Cboe First market, OCC-guaranteed
"Commission-free" trading You're still paying (via spread/PFOF)

5-Minute Pre-Exam Drill

  1. Four markets: Exchanges → OTC Unlisted → OTC Listed → Dark Pools
  2. NYSE = Auction + DMM / Nasdaq = Negotiated + Market Makers
  3. Broker = Commission / Dealer = Markup
  4. Hidden profit = Commission + Markup = PROHIBITED
  5. 5% = guideline, not rule / Mutual funds = 8.5% max
  6. After-hours = Less liquid, wider spreads, more volatile
  7. Almost all bonds trade OTC / Options trade on exchanges
  8. Dark pools = no public quotes

Ready to Dive Deep?

You've got the map. Now explore the territory in Section 7.1, where we'll break down each concept with full detail and more exam-style practice questions.

Or check out the Financial Markets Infographic for visual learners—featuring flowcharts, lifecycle diagrams, and comparison matrices.

Time estimate: 30 minutes for the full section