How JSE ALSI Futures Work — The Complete Guide for South African Traders (2026)

The ALSI futures contract is the most actively traded derivative on the Johannesburg Stock Exchange — and one of the most liquid equity index futures in the emerging markets. Thousands of South African and international traders buy and sell ALSI futures every day, yet many retail investors still find the instrument confusing, intimidating, or simply unknown. This guide changes that. By the end of this article, you will understand exactly how ALSI futures work, what they cost, how margin operates, when contracts expire, and how to place your first trade. We cover both the standard ALSI and the ALMI mini contract — the smaller, more accessible version designed for retail traders. Whether you are a JSE equity investor looking to add leverage and flexibility to your portfolio, a trader wanting to profit from short-term index movements, or simply a finance professional wanting to understand South Africa’s most actively traded derivative, this guide is for you.

What is the ALSI Futures Contract?

The ALSI (All Share Index) futures contract is a standardized, exchange-traded derivative listed on the JSE. It gives the holder exposure to the price movements of the FTSE/JSE Top 40 Index, which comprises the 40 largest companies listed on the JSE by market capitalization. ALSI futures contracts are based on the Top 40 index, usually trading at a slight premium to the underlying asset. Considered the holy grail for traders due to its huge liquidity, low transaction costs, and tight spreads, thousands of local and international traders regularly day trade ALSI futures. When you buy an ALSI futures contract, you are agreeing to receive the cash value of the Top 40 index at a future date at today’s agreed price. When you sell an ALSI futures contract, you are agreeing to deliver the cash value of the index at a future date. In practice, almost all ALSI futures positions are closed out before expiry — the profit or loss is settled in cash, and no physical delivery of shares ever occurs.

ALSI vs ALMI — Which Contract is Right for You?

There are two versions of the JSE index futures contract. The ALSI futures contract has the FTSE/JSE Top 40 Index (J200) as its underlying, with a contract size of R10 per index point. The ALMI futures contract also has the FTSE/JSE Top 40 Index as its underlying, but with a contract size of R1 per index point. Both contracts expire on the third Thursday of March, June, September, and December, or the previous business day if it falls on a public holiday. In practical terms, if the FTSE/JSE Top 40 Index is trading at 80,000 points, one ALSI contract represents 80,000 × R10 = R800,000 of index exposure, while one ALMI contract represents 80,000 × R1 = R80,000 of index exposure. The ALMI is exactly one-tenth the size of the ALSI — making it far more accessible for retail traders who want real futures exposure without the capital requirements of the full-sized contract.

	ALSI	ALMI
Best for	Institutional traders, experienced retail	Beginners, retail traders
Contract value (at 80,000 pts)	R800,000	R80,000
Point value	R10 per point	R1 per point

How ALSI Futures are Priced

While the ALSI futures tracks the underlying Top 40 index, there is no perfect relationship — ultimately, the ALSI futures price is driven by buyers and sellers, and a large order on either side can push the ALSI futures price out of sync with the underlying index. In theory, the fair value of an ALSI futures contract is calculated using the cost of carry formula: Futures Price = Spot Index Price × (1 + Risk-Free Rate) − Expected Dividends. This means ALSI futures typically trade at a slight premium to the current index level — reflecting the cost of financing a leveraged position — but this premium narrows as the contract approaches expiry, and at expiry the futures price converges exactly to the index level. The premium or discount between the futures price and the spot index is called the basis. Understanding basis is important for traders rolling positions from one quarterly contract to the next.

Understanding Margin — The Most Important Concept

Initial Margin

The Initial Margin Requirement (IMR) for a futures contract is equal to the profit or loss arising from the maximum anticipated or feared up or down move in its price from one day to the next. It is given in rands per futures contract. When one transacts in the ALSI futures, you trade at the index price and pay a margin as set per Safex, plus the broker’s variation margin — currently approximately R25,500 for the ALSI. The ALMI future is the mini version of the ALSI futures, with each index point worth only R1 and the required margin also a tenth of the ALSI futures margin — approximately R2,550. Margin requirements change over time based on market volatility — always check with your broker for the current margin requirements before trading.

Daily Mark-to-Market (Variation Margin)

Every evening after the JSE closes, your ALSI futures position is marked to market — meaning your profit or loss for the day is calculated and either credited to or debited from your account. For example, if you buy 1 ALSI futures contract at 80,000 points and the next day the index closes at 80,500 — a gain of 500 points — your daily profit is 500 points × R10 = R5,000 credited to your account. If the index had fallen to 79,500 — a loss of 500 points — your daily loss would be 500 points × R10 = R5,000 debited from your account. If your account balance falls below the maintenance margin level, you will receive a margin call — a demand from your broker to deposit additional funds immediately or have your position closed out.

Leverage — The Double-Edged Sword

ALSI futures offer significant leverage. At a margin requirement of R25,500 to control R800,000 of index exposure, the leverage ratio is approximately 31:1. This means a 1% move in the Top 40 Index produces an 800 point move on the ALSI futures, resulting in an R8,000 profit or loss per contract. On a R25,500 margin deposit, that R8,000 gain or loss represents a 31% return or loss on your margin. Leverage amplifies both profits and losses equally. This is why futures trading requires strict risk management — position sizing, stop losses, and never over-leveraging your account.

Contract Expiry and Settlement

ALSI and ALMI futures expire on the third Thursday of March, June, September, and December, or the previous business day if a public holiday. An intraday auction starts at noon (12h00) South African time on expiry day. The four quarterly expiry dates in a year are March, June, September, and December — typically the third Thursday of each month. The expiry valuation method uses an intraday auction based on a volume-maximizing algorithm between 12h00 and 12h15. If there are large price movements in a constituent stock, its auction will be extended by four minutes. The settlement price is determined by this intraday auction, not by the index’s closing price at the end of the day. This is important for traders holding positions into expiry.

Rolling a Position

Most ALSI futures traders do not hold positions to expiry. When you want to maintain exposure beyond the current expiry date, you roll your position — closing the near-term contract and opening a position in the next quarterly contract simultaneously. Rolling involves a cost or benefit called the roll cost, which reflects the difference in basis between the near and far contracts. Understanding roll costs is essential for longer-term traders who use ALSI futures as a portfolio overlay tool.

Profit and Loss — Worked Examples

Example 1: Buying ALSI Futures (Going Long)

Scenario: You believe the JSE Top 40 will rise over the next month. The current ALSI futures price is 80,000 points. You buy 1 ALSI contract at 80,000 with an initial margin required of R25,500. Two weeks later, the ALSI futures price is 82,500 points — up 2,500 points — and you close your position by selling 1 ALSI contract at 82,500. Profit calculation: Points gained = 82,500 − 80,000 = 2,500 points. Profit = 2,500 × R10 = R25,000. Return on margin = R25,000 ÷ R25,500 = 98% return in two weeks.

Example 2: Selling ALSI Futures (Going Short)

Scenario: You believe the JSE Top 40 will fall due to a global risk-off event. The current ALSI futures price is 80,000 points. You sell 1 ALSI contract at 80,000. One week later, the ALSI futures price is 77,000 points — down 3,000 points — and you close by buying 1 ALSI contract at 77,000. Profit calculation: Points gained = 80,000 − 77,000 = 3,000 points. Profit = 3,000 × R10 = R30,000.

Example 3: Using ALMI for Smaller Position Size

Scenario: Same market view as Example 1, but with smaller capital. The current ALMI futures price is 80,000 points. You buy 1 ALMI contract at 80,000 with an initial margin required of R2,550. Two weeks later, the index is up 2,500 points. Points gained = 2,500. Profit = 2,500 × R1 = R2,500. Return on margin = R2,500 ÷ R2,550 = 98% return in two weeks. This is the same percentage return as the ALSI — but with one-tenth the capital at risk. The ALMI is the ideal starting point for retail traders who want real ALSI futures exposure with significantly lower capital requirements.

Key Trading Strategies Using ALSI Futures

Directional Trading

The most straightforward use of ALSI futures — taking a view on the direction of the JSE Top 40 and buying (long) or selling (short) accordingly. This is the primary strategy for retail speculators.

Advantage: Can profit from both rising and falling markets — unlike buying physical shares, which only profits when prices rise.

Portfolio Hedging

Asset managers and sophisticated investors use ALSI futures to hedge their equity portfolio against a market downturn. By selling ALSI futures equal to the value of their portfolio, they create a synthetic hedge — any fall in their portfolio’s value is offset by gains on the short futures position.

Example: A portfolio manager holds R8 million in JSE Top 40 shares. The manager sells 10 ALSI contracts (10 × R800,000 = R8 million of index exposure). If the market falls 10%, the portfolio loses R800,000 — but the short futures position gains approximately R800,000. The portfolio is protected.

Index Replication

Rather than buying all 40 shares in the Top 40 Index individually, an investor can replicate the index’s performance by buying ALSI futures. This is far cheaper and faster than constructing a physical portfolio — no brokerage on 40 shares, no STT, no settlement delays.

Calendar Spreads

More sophisticated traders use calendar spreads — simultaneously buying a near-term ALSI contract and selling a far-term contract (or vice versa) — to profit from changes in the basis between contracts. This strategy has lower margin requirements than outright directional positions and is less sensitive to overall market direction.

How to Open an ALSI Futures Trading Account

To trade ALSI futures, you need an account with a JSE-authorized equity derivatives member. Here is the step-by-step process:

Step 1 — Choose a JSE-authorized broker

Leading brokers offering ALSI futures access include:

• Standard Bank Online Share Trading (OST) — most popular for retail ALSI futures traders
• PSG Wealth — strong for both retail and wealth management clients
• Absa Stockbrokers — preferred by institutional and high-net-worth clients
• SBG Securities — institutional focus.

Step 2 — Open a derivatives trading account

This is separate from a regular share trading account. You will need to complete additional documentation, including a derivatives risk disclosure acknowledgment and a financial needs analysis.

Step 3 — Fund your account

Deposit at a minimum the initial margin required for your intended position. For a single ALMI contract, you need approximately R2,550 in margin plus a buffer for potential variation margin calls.

Step 4 — Complete your broker’s derivatives training

Most JSE-authorized brokers require retail clients to complete a basic derivatives knowledge assessment before granting access to futures trading. This typically takes 30-60 minutes online.

Step 5 — Place your first trade

Log in to your trading platform, navigate to the derivatives section, find the ALSI or ALMI contract for the current quarterly expiry, and place your buy or sell order at your chosen price.

Risk Management — Essential Rules for ALSI Futures Traders

Rule 1 — Never risk more than 2% of your account on a single trade

Given the leverage inherent in ALSI futures, position sizing is the most important risk management decision you will make. A single contract loss of 1,000 points on the ALSI costs R10,000. Ensure your account can absorb this without a margin call.

Rule 2 — Always use a stop loss

ALSI futures are driven by buyers and sellers, and a large order on either side can push the ALSI futures price out of sync with the underlying index. Markets can move very quickly — particularly during global risk events, SARB interest rate announcements, or after major US economic data releases. Always have a predetermined exit point to limit losses.

Rule 3 — Understand overnight gap risk

ALSI futures trade during JSE hours (9:00 am to 5:00 pm SAST). Significant global events occurring overnight — a US Federal Reserve decision, a geopolitical shock, or a major corporate announcement — can cause the ALSI to open sharply higher or lower the next morning, potentially gapping through your stop loss level.

Rule 4 — Start with ALMI, not ALSI

New futures traders should always start with the ALMI mini contract. The smaller contract size means smaller profits — but also smaller losses, giving you real futures trading experience with significantly lower capital at risk.

Rule 5 — Never hold a futures position you cannot margin

Always maintain a cash buffer in your account above the minimum margin requirement. If you receive a margin call and cannot fund it, your broker will close your position at the worst possible time — typically at a loss.

ALSI Futures — Quick Reference Summary

Specification	ALSI	ALMI
Underlying index	FTSE/JSE Top 40 (J200)	9:00 am – 5:00 pm SAST
Point value	R10 per point	R1 per point
Contract value (at 80,000)	R800,000	R80,000
Approximate margin	R25,500	R2,550
Expiry months	March, June, September, December	March, June, September, December
Expiry day	3rd Thursday of expiry month	3rd Thursday of expiry month
Expiry time	12:00 noon SAST	12:00 noon SAST
Settlement	Cash Settled	Cash Settled
Trading hours	9:00am – 5:00pm SAST	9:00 am – 5:00 pm SAST
Minimum move	1 index point	1 index point

Conclusion

The ALSI futures contract is one of the most powerful and versatile trading instruments available to South African investors — offering leverage, two-directional exposure, and portfolio hedging capabilities that physical shares cannot.

ALSI futures are considered the holy grail for traders due to their high liquidity, low transaction costs, and tight spreads, with thousands of local and international traders regularly day trading them.

For beginners, the ALMI mini contract provides a perfect entry point — real futures market exposure with one-tenth the capital requirement of the full ALSI contract. Start small, learn the mechanics of margin and mark-to-market, and build your trading size gradually as your experience and confidence grow.

For experienced equity investors, ALSI futures offer a cost-effective and tax-efficient way to hedge portfolio risk, express market views with leverage, and replicate index exposure without buying individual shares.

The JSE’s ALSI futures market is open to all — individuals, institutions, local traders, and international investors. The barrier to entry is lower than most people think. What matters most is not the size of your starting capital but the quality of your understanding of how these instruments work.

Disclaimer: This article is for educational and informational purposes only and does not constitute financial or investment advice. Futures trading involves significant risk of loss, including the potential loss of more than your initial margin deposit. Always conduct your own due diligence and consult a qualified financial advisor before trading derivatives.