What are the core reasons why a listed company’s stock price falls after releasing positive announcements—such as a sharp earnings increase, M&A or restructuring, or policy support?

Many investors are puzzled: when a company announces explosive earnings growth, a major merger or acquisition, or receipt of policy benefits—clearly tangible good news—the stock opens sharply lower. Most people assess 'good news' solely on its surface, overlooking the core pricing logic of China’s A-share market: stocks trade on *expectations*, not on facts already realized. The moment an announcement is released is often precisely the point of *expectation fulfillment*; once the good news materializes, it becomes a window for capital to exit. To truly understand this, one must distinguish among expectation gaps, capital behavior, and broader market conditions—not simply judge price moves based on whether news appears 'positive' or 'negative'. The simplistic belief that 'positive news must lift prices' ignores a fundamental truth: capital markets trade in *future incremental value*, not current achievements. If the positive news has already been widely anticipated by the market, the stock price will likely have risen in advance; thus, the official announcement brings no new upside potential. Earnings surge = good news? Many overlook base effects, quarter-on-quarter changes, non-recurring adjustments, and inflection points in growth rates. For example, net profit may surge year-on-year—but primarily due to asset sales or one-time government subsidies, while core business profits actually decline; or growth slows markedly versus the prior quarter—constituting 'good news that falls short of expectations'. M&A or restructuring must boost share prices? Such deals carry substantial hidden risks: overpriced acquisitions generating massive goodwill, inflated performance commitments from targets, integration difficulties, and dilution of existing shareholders’ returns via配套 financing. Markets price in these risks immediately. Another misconception is that 'major players deliberately suppress prices'. In many cases, the decline isn’t manipulation or 'washing out weak hands', but rather a coordinated profit-taking by large positions that had accumulated earlier—pure expectation fulfillment. The most direct trigger is expectation fulfillment—'the good news is exhausted'. Well-informed institutions and funds conduct field research and forecast announcements well ahead of time. In the period before the official release, the stock price often rises steadily in anticipation. By the time the announcement goes public and retail investors rush in upon seeing headlines, early-positioned capital seizes the opportunity to sell and lock in gains—shifting supply-demand dynamics and pressuring the share price downward. In short: 'Buy the rumor, sell the fact.' The 'good news' may contain 'impurities'—a pseudo-positive. Earnings growth stems from non-recurring items, with no improvement in core operations; policy support consists only of vague documents, lacking concrete subsidies or orders; the acquired target has mediocre profitability and was purchased at excessive premiums. Professional capital quickly identifies such 'watered-down' positives, while retail investors see only headlines—creating wide divergence in expectations. The magnitude of the positive news falls short of the market’s consensus expectation. Market rumors anticipate 100% net profit growth, yet the announcement reveals only 40%; the market expects a major restructuring, but the deal turns out to be a minor equity stake.

Why does stock price fall despite a sharp earnings increase?

In April, the company officially released its strong first-quarter report. On the day the financial results were published, the stock surged to RMB 27 per share before rapidly retreating—trading on heavy volume but closing down. Lao Qian immediately concluded: the positive news had already been priced in, and major players were using the earnings report as cover to offload shares—a clear exit signal. He decisively sold his entire position at RMB 25, ultimately pocketing RMB 345,000, a profit of RMB 95,000, representing a 38% return. Same stock. Same initial capital of RMB 250,000. Lao Zheng: bought at RMB 25, cut losses at RMB 18—down 28%. Lao Qian: bought at RMB 18, sold at RMB 25—up 38%. The performance gap between them: 66 percentage points. This difference has never been about luck—it’s a chasm of cognitive depth. Why does buying based purely on earnings often lead to losses? Four fundamental truths: 1. Probabilistic reality: Stocks with sharp earnings increases tend to fall post-announcement. A securities firm analyzed all A-share stocks (2020–2024) that issued earnings previews forecasting >50% net profit growth: over the 30 trading days following the official earnings release, their average stock return was –3.2%, underperforming the CSI 300 Index by ~5 percentage points. In other words, stocks reporting substantial earnings growth, on average, decline after the announcement—and the probability of making money is below 40%. Relying on earnings announcements to 'bottom-fish' is inherently a low-probability strategy. 2. Cost friction: Buying upon announcement means buying at the peak of expectation fulfillment. Before the official report, 'smart money' has typically already anticipated the results and completed a round of speculative buying. In many cases, the stock has already risen 50%–100% ahead of the earnings release. Retail investors, waiting until the announcement to enter, effectively buy into an already overheated position. After the good news is digested, the stock often corrects 15%–20%. Waiting for the next earnings verification requires another three months—wasting significant time and capital. Lao Zheng’s loss stemmed precisely from falling into the 'exhausted positive news' trap. 3. Behavioral bias: Using earnings figures for psychological reassurance easily turns shallow losses into deep ones. Many retail investors buy stocks based on financial reports not because they’ve conducted deep fundamental analysis—but because impressive earnings numbers give them false confidence. They subconsciously assume: 'Earnings are so strong—if the stock falls, no problem; it’ll rebound eventually.' Once trapped, they refuse to cut losses, letting small drawdowns snowball into severe, long-term impairment. More critically, sources of net profit growth vary widely: asset disposals, one-time subsidies, artificially low prior-year bases, or accounting adjustments—all often non-recurring. Such gains do not reflect genuine, sustainable growth from core operations. Ordinary investors struggle to distinguish 'real growth' from 'fake growth'; relying solely on headline net profit figures to enter positions is, fundamentally, lazy investing. As in the case above, net profit soared 150%, but over half came from one-off asset sales; adjusted-for-non-recurring-items (non-GAAP) net profit rose only 30%. Lao Zheng overlooked the quality behind the numbers. 4. Market structure: In the short term, China’s A-share market is a 'funds market', not a pure 'earnings market'. Many confuse a key concept: 'Earnings matter in the long run; funds drive prices in the short run.' Short-term price movements hinge primarily on capital flows—not directly on financial results. Some companies deliver solid earnings but attract no speculative capital, remaining range-bound for extended periods; others post mediocre earnings yet see their stocks double, propelled by large-scale institutional buying. In A-shares, the earnings-driven valuation cycle typically takes 3–5 years, whereas the capital-driven speculation cycle lasts only 1–3 months.

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