Understand brokers and sub-brokers — Stock-Market notes

WHY does this role exist at all?

WHY not let everyone trade directly?

Settlement risk: If any random person could place a ₹10 crore order and then not pay, the whole market collapses. The exchange trusts members who have deposited margins and are regulated.
Standardisation: One clean pipe (the member's terminal) instead of millions of unverified connections.

WHAT exactly is a broker?

Key attributes:

Registered with SEBI (the regulator) → gets a registration number.
Is a member of the exchange → owns/leases a trading terminal.
Charges brokerage (commission) per trade.
Holds your money/securities via linked Demat + Bank + Trading account.

Definition Sub-broker

A sub-broker is not a member of the exchange. He acts on behalf of a broker (as the broker's agent) to help investors deal in securities — essentially the broker's agent / franchisee who sources and services clients. He earns a share of the brokerage, not a direct fee from the client.

⚠️ Important: A sub-broker is not unregulated. Under the SEBI (Stock-Brokers and Sub-Brokers) Regulations, 1992, a sub-broker must obtain his own SEBI registration certificate and register with the stock exchange(s) — even though he is not an exchange member. So he is SEBI-registered, just not a Trading Member.

Related but distinct — Authorised Person (AP): Separately, exchanges also allow brokers to appoint Authorised Persons, who act on behalf of a broker/trading member (this AP framework predates 2018). In many study materials "sub-broker" and "authorised person" are discussed together, but they are governed by their own rules; the sub-broker category continues to exist under SEBI regulations and exchange byelaws.

HOW money and orders flow

Figure — Understand brokers and sub-brokers

WHY the distinction actually matters (the 80/20 core)

Feature	Broker	Sub-broker
Member of exchange?	✅ Yes	❌ No
Registered with SEBI?	✅ Yes (as Trading Member)	✅ Yes (own registration certificate as sub-broker)
Registered with exchange?	✅ As member	✅ Affiliated/registered via his broker, but not a member
Can it place orders on exchange?	✅ Directly	❌ Only via the broker
Earns	Brokerage from client	Share of that brokerage
Whose agent?	Client's	The broker's

Deriving brokerage cost from first principles

Formula Cost of a trade

Brokerage is usually a percentage of turnover (or a flat fee, whichever the broker chooses). Start from what a trade is: $\text{Turnover} = \text{Price per share} \times \text{Quantity}$ If brokerage rate is $r$ (as a fraction), $\text{Brokerage} = r \times \text{Turnover} = r \times P \times Q$ Why this form? The broker's risk and effort scale with the value of what you trade, so charging a % of value is the natural first-principles choice. A sub-broker then gets a split $s$ of that: $\text{Sub-broker income} = s \times \text{Brokerage} = s \times r \times P \times Q$

Common mistakes (Steel-man → Fix)

Feynman check

Recall Explain to a 12-year-old (click to reveal)

Imagine a huge cricket-ticket counter that only lets a few official sellers inside. You can't go in. A broker is an official seller who goes in and buys the ticket for you and charges a small tip. A sub-broker is a friendly guy standing near your house who says "I'll take your order to the official seller" — he doesn't go inside himself, but he still has an official ID card (his own registration), and he takes a slice of the official seller's tip, not extra money from you. The ticket (your shares) is still 100% yours.

Active-recall flashcards

#flashcards/stock-market

What is a stock broker?

A SEBI-registered entity that is a member of a stock exchange and buys/sells securities on behalf of clients for brokerage.

Why can't a retail investor trade directly on the exchange?

The exchange is members-only; direct access is restricted to control settlement risk and standardise trading — so a broker acts as the bridge.

Is a sub-broker a member of the stock exchange?

No. He reaches the exchange only through the broker; only the broker is a member.

Does a sub-broker need his own SEBI registration?

Yes. Under the SEBI (Stock-Brokers and Sub-Brokers) Regulations, 1992, a sub-broker must obtain his own SEBI registration certificate and register with the exchange, though he is not an exchange member.

Who pays the sub-broker, and how?

The broker pays him a share of the brokerage; the client pays no extra amount.

Was the sub-broker category abolished in 2018?

No. The Authorised Person framework predates 2018 and is separate; the sub-broker category still exists under SEBI regulations and exchange byelaws.

Where are your shares actually held?

In your Demat account with a depository (CDSL/NSDL); the broker only executes trades, doesn't own them.

Formula for brokerage on a trade?

Brokerage

= r \times P \times Q

(rate × price × quantity).

Difference between full-service and discount broker cost model?

Full-service charges a % of turnover; discount charges a flat fee per order.

BEAM mnemonic meaning?

Broker = Exchange member; Agent (sub-broker) = Middleman only (registered but not a member).

Connections

Stock Exchange — the members-only marketplace brokers plug into
SEBI — regulator that registers brokers and sub-brokers
SEBI Stock-Brokers and Sub-Brokers Regulations 1992 — the rulebook requiring sub-broker registration
Demat Account — where the client's securities are actually held
Depository (CDSL NSDL) — legal custodian of your shares
Trading Account — the account through which broker orders are placed
Brokerage and Transaction Costs — full cost breakdown of a trade
Discount vs Full-Service Brokers — business-model comparison
Settlement Cycle (T+1) — how the trade completes after execution

Concept Map

Hinglish (regional understanding)

Intuition Hinglish mein samjho

Dekho, seedhi baat: stock exchange ek "members-only" club hai. Tum apne aap NSE ya BSE mein jaake share nahi khareed sakte — sirf uske registered members hi trade kar sakte hain. Yeh member hi broker kehlata hai. Jab tum app pe BUY dabate ho, tumhara order broker ke terminal se hokar exchange tak jaata hai, aur uske badle broker tumse thoda commission leta hai jise brokerage bolte hain.

Ab sub-broker kaun hai? Yeh woh banda hai jo exchange ka member nahi hai, par yaad rakho — woh unregulated bhi nahi hai. SEBI (Stock-Brokers and Sub-Brokers) Regulations, 1992 ke under sub-broker ko apni khud ki SEBI registration leni padti hai aur exchange ke saath register hona padta hai. Bas woh "member" nahi hota, "registered agent" hota hai. Woh broker ki taraf se clients laata hai aur apni kamai broker ki brokerage mein se ek hissa leta hai — tumse alag se koi extra paisa nahi. Isliye chahe sub-broker ho ya na ho, tumhara total cost same rehta hai.

Ek galat baat jo bahut phailti hai: "2018 mein SEBI ne sub-broker khatam kar diya." Yeh galat hai. Authorised Person ka framework 2018 se pehle ka hai aur alag mechanism hai; sub-broker category abhi bhi SEBI regulations aur exchange byelaws ke under exist karti hai. Doosri common galti: log sochte hain shares broker ke paas "owned" hote hain — nahi, tumhare shares tumhare apne Demat account (CDSL/NSDL) mein rehte hain, broker sirf order execute karta hai. Yaad rakhne ke liye BEAM: Broker = Exchange member; Agent (sub-broker) = registered middleman, par member nahi.

Formula bhi simple hai: Brokerage $= r \times P \times Q$ (rate × price × quantity). Agar 100 share ₹500 pe khareede aur rate 0.30% hai, toh turnover ₹50,000, aur brokerage ₹150. Agar sub-broker ka 60% share hai toh woh ₹90 kamaega — par tum abhi bhi sirf ₹150 hi dete ho. Discount brokers isi cheez ko todte hain: woh flat ₹20 per order lete hain, isliye bade trades pe woh sasta padta hai.

Test yourself — Market Participants

Connections