Grain Rain Secret Manual 2: How Retail Traders Can Manage Position Sizing and Apply It in Practice

谷雨秘籍 2: How Retail Investors Can Do Position Management Well and Apply It in Practice

Master Secret Overall: Strictly adhere to position risk control. Build a layered core position, spread holdings across multiple positions, insist on keeping only a single asset and never over-concentrate, and firmly keep account drawdowns within a safe range.

Principal is the foundation of trading, and position size is the first line of risk control. Combined with today’s market characteristics—quantitative strategies frequently smashing the market and the行情 repeatedly oscillating—this position management approach is highly practical and fits traders at different stages: for newcomers, it’s recommended to use only a 10% position size long-term to repeatedly practice and refine mindset and techniques; for traders with more than three years of stable live-trading experience, they can fully follow the rules below to execute position management.

1. Hold the baseline for basic trades

Firmly eliminate the idea of going all-in with a single “bet”; in a ranging market, keep total position size within 50% on a daily basis.

Holdings emphasize a dual diversification principle: you must diversify not only individual stocks, but also sectors. The position share of any single stock must not exceed 20%, and the sector to which the overall holdings belong must be no more than three. Never concentrate all chips into a single sector, and completely avoid the risk of systemic drawdowns caused by a collective sector pullback.

Precisely control the portfolio structure: ETF + stocks total only 3–5 assets is enough. The number of pure stocks is strictly forbidden to exceed 3. Keep holdings lean to make it easier to monitor the market and execute, while also avoiding sudden “black swan” negative surprises in individual stocks.

Trade only with idle funds throughout; no borrowing and no pressure, so you can steadily execute all position disciplines.

2. For retail investors: the three-equal-parts basic build method

Divide available capital evenly into three parts:

First part: build a probing core position, used to test your judgment of the market and the strength of individual stocks;
After price action matches expectations and the trend stabilizes and strengthens, use the second part to add on strength;
Finally, keep the third part as a reserve for later, specifically to seize low-entry opportunities during sharp drops, wrong-cuts, and pullbacks.

With this batch-building approach, even if the move is not as expected, you can still keep losses within a very small range thanks to the advantage of lighter positioning.

3. Adapting to quantitative markets: techniques for dynamic position sizing

Given the current market characteristics of high-frequency quantitative smashing and repeated harvesting, keep only a comfortable core position in the main theme sectors:

In typical grinding markets with mild oscillation—small up and small down—hold firmly and don’t move, and absolutely avoid frequent random actions and repeated turnover losses;
When the market presents a point of sharp selloff panic and emotional venting, selectively add on dips, wait for subsequent rebound and upward expansion, and use rolling T trades to capture arbitrage;
Once an asset effectively breaks below the 20-day moving average, it indicates the medium-term trend has weakened completely—no further adding is allowed. Proactively reduce position size or directly liquidate to avoid risk.

4. Adjust with the environment: position sizing based on broader market conditions

• If the overall market trend is favorable and the main line is clear: raise position size to 60%–80%, and go with the trend to eat the major upswing swing;
• If the market is range-bound and repeatedly tug-of-war: maintain a neutral position size of 30%–50%, focusing on dip-buying and high-selling to profit from swing price differences;
• If the index continues to weaken and the money-making effect is extremely poor: keep only a 10%–20% core for watching from the sidelines. If the market is extremely weak, you can go to cash (short) directly—prioritize preserving principal.

5. Retail investors must follow: core trading discipline

Only add to assets whose trend is strengthening and that are already in profit. Absolutely do not blindly add to weak stocks that are in a loss to average down the cost;
During the up move, take profit in batches. Don’t chase the highest point—real profit is to lock in gains;
Set a strict 5% hard stop-loss standard. If a stock breaks key support and the loss reaches the threshold, promptly reduce positions or directly clear the position. Firmly prevent getting stuck and “holding bags” into a trap.

Managing position size is the core foundation for retail investors to achieve long-term stable profitability. Stock selection may have deviations, and timing may have mistakes—but as long as position discipline is in place, you can firmly掌握 trading initiative and greatly improve your chances of surviving in the market.