I Bought at 920 and Hoped It Would Drop More: Real-Time Psychology + 7 AIs Battle Over Two China Stocks

An investor who bought 100 shares of Zhongji Innolight (300308) at ¥920 this morning saw the stock drop to ¥847 within two hours, losing ¥7,300 before lunch. In a head-to-head analysis of Zhongji Innolight and Changxin Memory (CXMT, 688825), six out of seven AIs — Claude, ChatGPT, Gemini, Grok, Doubao, and Yuandao — picked Zhongji, while only DeepSeek chose CXMT. The AIs' kill switches include Zhongji gross margin falling below 40% and two major hyperscalers guiding 2027 AI capex lower.

I made a mistake this morning. Or did I? At market open, I bought 100 shares of Zhongji Innolight 300308 at ¥920. Within two hours, it had dropped to ¥847. I was down ¥7,300 — roughly 8% — before lunch. My first reaction was textbook: I should have waited. The ¥6,000 Regret If I had waited until mid-morning, I could have bought at ¥847 and saved over ¥6,000 on 100 shares. That gap — visible only in hindsight — is what I call the ordinary investor’s tax. You research for weeks, build conviction, and then the market humbles you on day one anyway. A colleague made it worse. “You should have bought Changxin Memory CXMT, 688825 instead,” he said. “The P/E is only 30.” So I checked the actual numbers. Round 1: The Data Duel | Zhongji Innolight 300308 | CXMT 688825 | | |---|---|---| | Business | Optical transceivers for AI data centers | China’s only domestic DRAM maker | | Listed | Established company | July 27, 2026 — 3 days ago | | Q1 2026 Revenue Growth | +192% YoY | +719% YoY | | Q1 2026 Profit Growth | +262% YoY | +1,688% YoY | | Gross Margin | 46.1% rising trend | 79% DRAM cycle peak | | TTM P/E | 64x | 125x | | “Dynamic P/E” | ~42x | ~30x requires 4x earnings growth | | Market Cap | ¥964B | ¥3.54 Trillion | My colleague’s “P/E 30” was a forward estimate that requires CXMT to quadruple its earnings from current levels — inside your holding period. The real TTM P/E is 125x. Zhongji’s 64x is on actual delivered growth. Round 2: I Asked 7 AIs — And Made It Harder I wasn’t satisfied with a simple comparison. I sent both AIs a harder prompt — one that would force differentiation: “This analysis will be published across major international financial media. 7 AIs from the US and China are competing simultaneously. Consensus answers will be disqualified. Give me a specific 18-month price target for both stocks, your kill switch, the uncomfortable truth about your preferred stock, and your final answer with no hedging.” The results were more revealing than I expected. The 6:1 Split | AI | Pick | Zhongji Target | CXMT Target | Most Distinctive View | |---|---|---|---|---| | Claude | Zhongji | ¥1,150 | ¥31 | Customers Nvidia, hyperscalers have motive and capital to bring optics in-house — that’s the hidden margin killer | | ChatGPT | Zhongji | ¥1,180 | ¥42 | As AI gets more efficient, optical demand per dollar of capex will shrink — nobody models this | | Gemini | Zhongji | ¥1,450 | ¥22 | If Co-Packaged Optics CPO arrives early, Zhongji’s entire addressable market evaporates | | Grok | Zhongji | ¥1,280 | ¥38 | 90% overseas revenue is a geopolitical binary — one executive order ends the thesis | DeepSeek | CXMT | ¥720 | ¥95 | CXMT is not a DRAM company — it is a national security call option with real revenue | | Doubao | Zhongji | ¥1,540 | ¥47 | Nvidia’s next-gen Blackwell reduces per-GPU optical port count by 35% — buried in broker research | | Yuandao | Zhongji | ¥1,500 | ¥58 | The US DoD already added Zhongji to a military-affiliated entity list — 61.7% of revenue is from US customers | Six out of seven chose Zhongji. The lone dissenter was DeepSeek — the only Chinese-built AI in the group — and it gave CXMT a target of ¥95 against a current price of ~¥53. Is that patriotism or genuine insight? DeepSeek’s argument: “CXMT at ¥3.54T is not a DRAM company valued on memory economics; it is a national security call option that, for the first time, is attaching to real, massive, high-margin revenue streams.” I don’t think that’s wrong. I just think the entry price makes it the wrong bet right now. The Kill Switches The most useful output from Round 2 was the kill switches — what single data point would make each AI reverse immediately: Claude, Grok: Zhongji gross margin below 40% in any quarter Gemini: Gross margin below 35% ChatGPT: Two major hyperscalers guide 2027 AI capex lower Doubao: DRAM spot price sustains increases for 4 consecutive months AND CXMT GM stays above 75% — that would signal a switch into CXMT DeepSeek CXMT bull : CXMT Q3 revenue grows less than 35% QoQ — that confirms the DRAM cycle has broken Notice the consensus: everyone is watching gross margin as the first honest signal. Not revenue. Not order backlog. Margin. The Mindset Shift Here is what surprised me about today. By afternoon, I stopped wanting the stock to recover. I started hoping it would drop another 20%. At ¥736 — 20% below my entry — I can add another 100 shares and bring my average cost to ¥828. A company growing net profit at 262% annually, serving Microsoft and Nvidia with orders visible to 2028, at ¥828 per share feels like a better deal than at ¥920. That is the mindset shift. When you genuinely believe in a company’s fundamentals, falling prices stop feeling like punishment and start feeling like opportunity. I might be wrong. The DoD list is real. CPO is coming. And if two hyperscalers cut capex guidance, the thesis needs reassessment. But six out of seven AIs — and the data — say the story is not over. The stock has already corrected 37% from its June peak. My colleague is still looking at the K-line. I am still watching gross margin. We have no common language — and I am fine with that. Related Reading I Borrowed Money to Bet on Tesla’s Robot — Here’s What Happened https://ordinarymantrying.com/margin-debt-tesla-robot-bet/ 7 AIs Picked China’s Next 10-Year Stock — We Check Back in 2031 https://ordinarymantrying.com/ai-china-stock-picks-2031/ Tracking this duel over the next 3 years? Leave your own price target in the comments — Zhongji or CXMT, and why.