Insider Trading Analysis — AI Semiconductor Industry Chain Track SEC Form 4 insider trading filings from 53 core AI semiconductor companies. Data sourced from the SEC’s EDGAR database, polled in real time every 5 minutes—so you’re among the first to know what insiders are buying or selling. What can this tool do for you? Form 4 filings are mandatory public disclosures required by the U.S. Securities and Exchange Commission (SEC) for corporate executives, directors, and beneficial owners holding more than 10% of a company’s shares. These must be filed within two business days after a transaction. By systematically tracking these filings, you gain insight into insiders’ genuine sentiment toward their own stock—are they putting real money on the line to buy, or are they collectively offloading shares? Page Navigation Overview See capital flow across the entire industry chain at a glance. Key metric cards display number of transactions, buy/sell amounts, net sell amount, and sell-pressure ratio. Below, the real-time Filing Feed is the most practical feature: it aggregates every insider trade over the past three days by company (collapsed by default), showing only the company-level summary (net sell amount). Click to expand and view full details for each trade—who sold, their position, price, and transaction value. Group Overview Six grouped categories for horizontal comparison: Core Semiconductors (e.g., NVDA, AMD, ARM—30 companies), Optical Interconnects (e.g., ANET, ALAB—12 companies), Memory (e.g., MU), Data Center Construction (e.g., PLTR, CLS—13 companies), M7 Tech Giants, and the Full AI Semiconductor Universe. Each group card displays buy/sell/ net amounts, sell-pressure ratio, number of insiders involved, and median share reduction. Click through to see complete transaction details for that group. Comparison All groups appear side-by-side in a single table, enabling direct comparison of sell pressure, median sell amount, P90 large-scale trades, and shareholding reduction magnitude. At the bottom, a sell-pressure heatmap and comparative reduction-distribution chart help you quickly identify which sector’s insiders are most actively selling.

Insider Trading Factor Research

Quantitative analysis excels precisely where subjective, anecdotal experience falls short—by stripping away bias to reveal objective truth. /02 Key Findings from the Original Paper Original Sample: From Q1 2022 to Q2 2026, we identified 7,405 scorable signals (issuer × filing date) from non-10b5-1 purchases made by C-suite executives and individuals coded as ‘Code P’ (insiders subject to Section 16 reporting), after applying filters. An event study was conducted using SPY as the benchmark: Metric N Mean Two-way Clustered t-statistic SPY-adjusted CAR (1-day) 7,405 +0.534% 6.460 SPY-adjusted CAR (5-day) 7,404 +1.009% 5.053 CAR (21-day) 7,397 +0.980% 1.678 (includes zero) CAR (63-day) 7,048 +1.103% 1.194 (includes zero) The paper’s conclusion is deliberately cautious—but the data itself is compelling: 1. Statistically significant SPY-adjusted abnormal returns are observed in the short term (1-day: +0.53%; 5-day: +1.01%), with two-way clustered t-statistics of 6.46 and 5.05—confidence intervals exclude zero. 2. For longer horizons (21- and 63-day), CAR/BHAR confidence intervals include zero—no robust evidence supports persistent post-purchase drift. II. A-Share Form 4 Equivalent Although China’s A-share market lacks an exact Form 4 equivalent, it does have a functionally similar disclosure regime: directors, supervisors, senior management, and shareholders holding ≥5% of shares must publicly disclose changes in their equity holdings. Below is a summary of how insider trading disclosures are accessed across the three major markets discussed in this paper: Jurisdiction/Region Platform Legal Basis Reporting Entities USA EDGAR (operated by SEC) Securities Exchange Act of 1934, Section 16 Directors, officers, beneficial owners holding >10%—Form 4 Hong Kong HKEXnews (Disclosure Easy) Securities and Futures Ordinance (SFO), Part XV Directors, chief executives, shareholders holding ≥5% Mainland China CNINFO (http://www.cninfo.com.cn) + SSE/SZSE disclosure platforms Securities Law + Shanghai/Shenzhen Stock Exchange Rules Directors, supervisors, senior management + shareholders holding ≥5% All three systems mandate free, electronic, publicly accessible disclosures. However, in the A-share market, official disclosures are published in unstructured text format. Direct use therefore requires web scraping and parsing. Consequently, most users rely on third-party tools—such as Tushare—to obtain structured insider trading data. Tushare Data Interface Tushare (requires sufficient user points) provides structured data on director/supervisor and shareholder share changes: 1. stk_holdertrade (Shareholder Trading Activity)—closest analog to Form 4; returns fields including: ・ann_date: announcement date ・holder_name: name of shareholder or executive ・holder_type: G = executive (director/supervisor/senior manager), P = individual shareholder (≥5%), C = corporate shareholder ・in_de: IN =增持 (increase), DE = 减持 (decrease) — corresponding to Form 4’s P (purchase) / S (sale) ・change_vol, change_ratio: volume and percentage change ・avg_price, after_share, after_ratio: average transaction price, post-transaction shareholding quantity and percentage ・total_share: total shares outstanding ・begin_date: start date of the increase/decrease activity ・close_date: end date of the increase/decrease activity

H.B. Fuller Insider Bought Shares Worth $500,000, According to a Recent SEC Filing

Oct 8, 2026

An H.B. Fuller insider purchased $500,000 worth of shares per a recent SEC filing, while the board continues to reject acquisition attempts by Ancora Holdings Group for its Building Adhesive Solutions segment.

www.marketscreener.com

2026-04-08

H.B. Fuller CEO Purchases $295,103.60 in Stock

2026-04-10

H.B. Fuller President Acquires Additional 14% Stake

2026-04-12

H.B. Fuller Receives Moderate Buy Consensus from Analysts

2026-04-12

Does H.B. Fuller (FUL) CEO Share Buying Clarify or Complicate Its Margin-Focused Investment Narrative?

2026-04-14

H.B. Fuller VP Receives Phantom Units and Discloses Option, RSU Holdings