Core Definition of Stock Liquidity
Stock liquidity refers to how easily a stock can be bought or sold -- how quickly and easily you can enter or exit a position without significantly affecting the price. You can also use the platform's Stock Radar to quickly screen for stocks with sufficient liquidity.
High Liquidity vs Low Liquidity
| Feature | High Liquidity | Low Liquidity |
|---|---|---|
| Volume | Large | Small |
| Bid-Ask Spread | Small (<0.5%) | Large (>2%) |
| Execution Speed | Instant | Orders sit unfilled |
| Price Impact | Small | Large |
| Examples | Tencent, Alibaba | Small HK stocks |
Liquidity Assessment Criteria
Criterion 1: Average Daily Volume
| Volume Range | Liquidity Rating | Recommendation |
|---|---|---|
| > 1M shares | Excellent | Suitable for all capital sizes |
| 200K-1M shares | Good | Suitable for small to medium capital |
| 50K-200K shares | Fair | Small capital may consider |
| < 50K shares | Poor | Avoid |
Criterion 2: Average Daily Dollar Volume
| Dollar Volume | Liquidity Rating |
|---|---|
| > $10M | Excellent |
| $1M-$10M | Good |
| $100K-$1M | Fair |
| < $100K | Avoid |
Criterion 3: Bid-Ask Spread
Bid-Ask Spread = (Ask Price - Bid Price) / Ask Price x 100%
| Spread Range | Rating |
|---|---|
| < 0.5% | Excellent |
| 0.5-1% | Acceptable |
| 1-2% | High |
| > 2% | Avoid |
Liquidity Requirements by Capital Size
| Capital Size | Minimum Daily Dollar Volume | Recommended Holdings |
|---|---|---|
| < $500K | $500K | 3-5 stocks |
| $500K-$2M | $2M | 5-10 stocks |
| $2M-$5M | $5M | 8-12 stocks |
| > $5M | $10M | 10-15 stocks |
Rule: Your single trade value should not exceed 5% of the stock's average daily dollar volume. For example, a stock with $1M daily dollar volume can accommodate at most $50K of your buy order.
Risks of Insufficient Liquidity
Risk 1: Inability to Stop-Loss in Time
This is the most致命 risk. When you need to stop out, you find no buyers and are forced to sell at a lower price -- or cannot sell at all.
Example: You buy a small-cap stock with only 10K average daily shares. The price suddenly drops 10%. You want to sell, but there are no buyers. Your sell order just sits there as you watch the price continue falling.
Risk 2: Forced Discount Selling
For illiquid stocks, you often need to lower your price to find a buyer. This can cost you an additional 3-5%.
Risk 3: Manipulation by Large Players
Low-volume stocks are容易 to manipulate. Large players can push prices up or down with relatively small capital, putting you at a disadvantage.
Risk 4: Inability to Build Adequate Position
If you have large capital, you simply cannot buy enough shares of an illiquid stock without moving the price against you.
Special Considerations for Hong Kong Stocks
Issue 1: Extremely Low Liquidity for Small HK Stocks
The HK market has many small-cap stocks with extremely low volume. Stocks trading fewer than 100K shares daily are common.
Recommendation: Retail investors should avoid HK stocks with average daily dollar volume below $500K HKD.
Issue 2: Impact of Southbound Capital
When mainland capital (Stock Connect) flows in significantly, HK stock liquidity improves noticeably. Monitor daily Stock Connect flows.
Issue 3: IPO Initial Liquidity
Newly listed stocks usually have good initial liquidity, but it may shrink rapidly after 1-3 months.
Practical Screening Settings
In the Stock Screener, set:
| Condition | Setting |
|---|---|
| Average Daily Volume | > 200K shares |
| Average Daily Dollar Volume | > $1M |
| Market Cap | > $1B |
| Bid-Ask Spread | < 1% |
Summary
Core principles of liquidity screening:
- Volume is your lifeline -- no liquidity means no ability to stop out
- Average daily dollar volume > $1M -- minimum safety standard for retail investors
- Your buy amount < 5% of daily dollar volume -- avoid becoming the price driver
- Be especially careful with small HK stocks -- extremely high liquidity risk
Remember: No matter how good a stock's fundamentals are, without sufficient liquidity, it is dangerous. Liquidity is the first hurdle in stock selection -- pass this test before looking at anything else. For more stock selection strategies, see Strategy Center.