Understand the seasonality of 81 industries at a glance

2. Regarding sample selection, a trade-off between sample size and time span was unavoidable. As more companies go public over time, the total number of listed firms keeps growing; the earlier and longer the sample period, the smaller the resulting sample size. Therefore, we selected only those companies already listed by Q1 2019—totaling 3,606 firms—which published all four required financial statements. We excluded 2020 data for two reasons: first, the pandemic rendered that year highly atypical; second, the 2020 annual reports were not yet fully disclosed. We also omitted data from 2018 and earlier years, which had the added benefit of simplifying annual-level data processing. During computation, some firms exhibited missing data; such cases were excluded. Fortunately, only about a dozen such instances occurred—negligible in number. 3. Industry classification follows the China Securities Regulatory Commission’s (CSRC) 2012 edition of the 'Guidelines for Industry Classification of Listed Companies', yielding 81 secondary-level industries. The granularity of industry segmentation itself involves another necessary trade-off: overly broad categories render firms within the same 'major industry' incomparable; overly fine categories may leave too few firms per 'minor industry', undermining representativeness. Moreover, the number of listed firms varies significantly across major industries, limiting the feasibility of uniform further subdivision. Accordingly, we adopted the original database’s classification without subjective adjustments. For analyses focused on specific industries, finer segmentation is often warranted. For instance, within the 'Wine, Beverages, and Refined Tea Manufacturing' sector (industry code C15, comprising 42 listed firms), baijiu (traditionally consumed in winter for warmth) and beer (popular in summer for refreshment) are hardly comparable. To distinguish them, we would need to subdivide down to the tertiary level (where 'Manufacturing' is Level 1, and 'C15' is Level 2). However, such granular data is unavailable in existing databases—and even if available, many tertiary-level industries would contain only one or two firms, rendering their statistics unrepresentative of the broader industry. This reflects the inherent tension between large-sample empirical research (our approach here) and small-sample case studies (more common in practice). The number of listed firms per industry is detailed later in this article. 4. For measurement metrics, we selected two complementary indicators to address the two core questions posed at the outset. First, to identify which quarter constitutes peak or off-season for each industry—or whether a given quarter is relatively strong or weak—we computed a quarterly seasonality factor: quarterly revenue divided by annual revenue, multiplied by 4 (i.e., annualized). In a perfectly non-seasonal firm or industry, each quarter contributes exactly one-quarter of annual revenue, yielding a seasonality factor of 1. Factors above 1 indicate peak seasons; those below 1 indicate off-seasons. Second, to gauge the overall strength of seasonality across quarters, we calculated, for each industry, the absolute deviation of each of its four seasonality factors from their mean value (which equals 1); then took the average of those four absolute deviations. We term this average the 'seasonality intensity coefficient'. In theory, the strongest possible seasonality occurs when an entire year’s revenue is concentrated in a single quarter—with zero revenue in the other three—yielding a seasonality coefficient of 1.5 (readers are encouraged to verify this calculation).

March 15, 2026 | NVIDIA GTC Conference | U.S. Tech Stocks Pull Back | Covered Call High-Yield Options | Global Supply Chain Disruptions

Section II: Global Core Financial & Tech News (Ranked by Media Buzz) 1. JPMorgan Chase Aggressively Enters Startup Banking Niche to Succeed Silicon Valley Bank (Business News | Tech) — Following Silicon Valley Bank’s collapse, a void emerged in financial services for startups. JPMorgan Chase is now aggressively entering this space—not only to attract deposits but also to reinforce its long-term competitiveness as the world’s largest bank and secure future service relationships with innovative tech enterprises. 2. NVIDIA’s GTC Conference Approaches, Set to Unveil AI Chip and CPU Strategy (Tech) — At this year’s GTC, NVIDIA CEO Jensen Huang will unveil a dedicated processor for embodied AI and disclose a new product roadmap integrating technology from AI chip startup Groq. Market demand for NVIDIA’s CPUs has surged explosively; this announcement is widely viewed as a pivotal milestone in NVIDIA’s transformation from a GPU-centric company into a full-stack AI computing provider. 3. Middle East Tensions Elevate Global Risk Aversion and Commodity Prices, Impacting Multiple Sectors (Business News) — Escalating conflict involving Iran has pushed up U.S. Treasury yields; the U.S. 30-year mortgage rate has risen to its highest level since last September, significantly dampening spring home sales. Meanwhile, global supply chain disruptions may push up retail prices in the U.S.; rising jet fuel costs have already prompted multiple airlines to raise ticket prices. Concurrently, heightened risk-aversion among high-net-worth individuals has boosted auction volumes for alternative collectibles—including art and classic cars—with total sales recently exceeding $600 million, outperforming most risk assets. 4. Paramount and NFL Negotiate Media Rights Renewal, Targeting Over $1 Billion Fee Hike (Business News) — The NFL is negotiating with Paramount to eliminate the opt-out clause for the 2029–2030 season; in exchange, CBS’s annual rights fee would rise by over $1 billion—from roughly $2 billion today to more than $3 billion. Paramount’s CEO also announced plans to produce 30 films annually, leveraging IP franchises including Godzilla-Kong, Superman, and Sonic—with ambitions to rank among North America’s top box-office performers by 2027. 5. Amazon Prime Video Ad-Free Tier Increases Price by $2/Month (Tech) — Amazon announced a price hike for its ad-free Prime Video subscription in the U.S., raising it from $2.99 to $4.99 per month—a 66% increase—making it the latest tech giant, after Netflix, to raise streaming subscription fees. Amazon also stated its willingness to negotiate with the Canadian government regarding the closure of its Quebec operations, a move expected to affect 1,700 employees. 6. Elon Musk Announces xAI Will Be Fully Merged Into SpaceX and Undergo Restructuring (Tech) — Following the departure of several co-founders from xAI, Elon Musk announced that xAI will be integrated entirely under SpaceX and undergo comprehensive restructuring. SpaceX’s IPO process is likewise progressing steadily. 7. Uber’s Former CEO Travis Kalanick Renames His Company Atoms, Shifts Focus to Mining and Transportation Robots (Tech) — Kalanick has rebranded his firm City Storage Systems as Atoms, pivoting its core business toward developing specialized robots for mining and transportation—officially entering the industrial robotics sector. 8. ServiceNow CEO Warns AI May Push New Graduates’ Unemployment Rate Above 30% (Tech) — ServiceNow’s CEO cautioned that widespread adoption of AI agents will displace numerous entry-level white-collar roles. Indeed, tech firms including Block and Atlassian have already initiated layoffs this year due to AI-driven efficiencies—and the employment pressure facing university graduates is expected to intensify markedly over the next three years. 9. AI Data Center Energy Consumption Sparks Public Debate, Triggering PR Crises for Tech Giants (Tech) — Surging AI compute demand has sharply increased data center electricity usage. Leading North American tech firms now face public scrutiny over energy overconsumption and excessive use of public resources. In response, these companies have begun investing in next-generation energy-efficient computing technologies to mitigate reputational risks. 10. Hedge Fund Manager Dan Loeb Reduces Positions in Amazon, Microsoft, Meta; Adds Stake in an AI ‘Dark Horse’ (Yahoo Finance) — Prominent hedge fund manager Dan Loeb’s latest filing reveals he has trimmed holdings in the three AI titans—Amazon, Microsoft, and Meta—while increasing exposure to an AI-focused stock whose cumulative return since listing has reached 453,000%. 11. Novo Nordisk’s Novel Weight-Loss Drug Shows Clinical Data Exceeding Expectations, Driving Sharp Stock Surge (WSJ.com: US Business) — Novo Nordisk reported clinical trial results showing participants lost, on average, 22% of body weight after treatment—far surpassing efficacy of currently marketed weight-loss drugs. The news triggered a substantial rally in the company’s share price. 12. EU Conditionally Approves International Paper’s $7.16B Acquisition of DS Smith (WSJ.com: US Business) — The European Commission has approved International Paper’s acquisition of DS Smith, subject to divestiture of five European plants to resolve antitrust concerns. Upon completion, International Paper will become one of Europe’s largest packaging paper suppliers. 13. Blackstone Aggressively Sells Off Commercial Real Estate Holdings in January, Adjusting REIT Portfolio (Business News) — Blackstone is actively rebalancing its real estate investment trust (REIT) portfolio, having sold substantial commercial real estate positions in January. Market observers interpret this as a signal of Blackstone’s cautious outlook on the commercial real estate sector’s near-term trajectory. 14. Starbucks Union Submits New Contract Proposal, Restarting Labor Negotiations (Business News) — The union representing employees at 6% of Starbucks’ U.S. company-operated stores has submitted a new contract proposal to management. Negotiations had stalled last year; this proposal addresses core worker demands, including wages and scheduling. Section III: Teacher Tang’s Daily Chit-Chat Hi everyone! Today’s weather in Meishan is absolutely delightful—the breeze along the Min River carries the sweet fragrance of rapeseed blossoms. This morning, Teacher Tang and I walked our two daughters to school. The younger one had snuck two milk candies into her pocket, declaring she’d share them with her best friend at kindergarten—only to be caught red-handed by her mom, prompting a defiant (and utterly adorable) denial: “They’re not for me!” 😄 After dropping them off, we relaxed in the courtyard with a cup of Mengdingshan tea. This morning, Teacher Tang was still refining the EA code for his CC (Covered Call) strategy—commenting that rising tech-stock volatility has directly boosted his covered-call income. He mused that trading truly requires the Buddhist mindset of ‘going with the flow’: earn only what aligns with your understanding, avoid chasing get-rich-quick schemes, and prioritize securing profits over speculative gambles. Oh—and at noon, my sister-in-law will prepare her signature Dongpo Pork. I’ve already set out my bowl! 😂 Curious how the 'CC Annualized Return' in the table above lets you 'lie back and collect rent'? Essential reading for beginners → [Teacher Tang’s Column] A Step-by-Step Guide to Steadily Collecting Rent via Covered Calls! ⚠️ Disclaimer: All content and charts herein reflect automated outputs and test logs from the EA Bang站长’s proprietary algorithmic trading (quantitative model) system. Any stock tickers, option yield figures, or related information cited serve solely for validating algorithm logic and technical discussion—and constitute absolutely no investment or trading advice. Options trading entails significant risk; all gains and losses are borne entirely by the user.

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