Privacy Policy

Last updated: October 15, 2026

Introduction

Welcome to QuantStock ("we," "our," or "us"). We are committed to protecting your privacy and ensuring the security of your personal information. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you visit our website quantstock.cc and use our portfolio optimization services.

By accessing or using QuantStock, you agree to this Privacy Policy. If you do not agree with our policies and practices, please do not use our services.

Information We Collect

Personal Information

We may collect the following types of personal information:

  • Contact Information: Email address when you contact us or subscribe to our newsletter
  • Newsletter Signups: When you request our free cheat sheet or subscribe, we store your email address, the page you signed up from and the date on our own server. We use it only to send QuantStock emails, never sell or share it, and delete it on request; you can unsubscribe at any time by contacting us at contact@quantstock.cc.
  • Portfolio Data: Stock tickers and portfolio preferences you input into our optimization tools
  • Account Information: If you create an account, we collect username and password

Automatically Collected Information

When you visit our website, we automatically collect certain information about your device:

  • Usage Data: Pages visited, time spent, links clicked, and navigation paths
  • Device Information: IP address, browser type, operating system, device identifiers
  • Location Data: General geographic location based on IP address
  • Cookies and Tracking: See our Cookies Policy section below

How We Use Your Information

We use the collected information for various purposes:

  • To provide and maintain our portfolio optimization services
  • To process your portfolio calculations and display results
  • To send you updates, newsletters, and marketing communications (with your consent)
  • To respond to your inquiries and provide customer support
  • To analyze usage patterns and improve our website and services
  • To detect, prevent, and address technical issues and security threats
  • To comply with legal obligations and enforce our Terms of Service
  • To display personalized advertisements through Google AdSense

Cookies and Tracking Technologies

We use cookies and similar tracking technologies to track activity on our website and store certain information. Cookies are files with a small amount of data sent to your browser from a website and stored on your device.

Types of Cookies We Use

  • Essential Cookies: Required for the website to function properly
  • Analytics Cookies: Help us understand how visitors interact with our website
  • Advertising Cookies: Used to display relevant advertisements through Google AdSense
  • Preference Cookies: Remember your settings and preferences

You can instruct your browser to refuse all cookies or indicate when a cookie is being sent. However, if you do not accept cookies, you may not be able to use some portions of our service.

Third-Party Services

Google AdSense

We use Google AdSense to display advertisements on our website. Google AdSense uses cookies to serve ads based on your prior visits to our website or other websites. Google's use of advertising cookies enables it and its partners to serve ads based on your visits to our site and/or other sites on the Internet.

You may opt out of personalized advertising by visiting Google Ads Settings or www.aboutads.info.

Google Analytics

We use Google Analytics to analyze website traffic and usage patterns. Google Analytics collects information anonymously and reports website trends without identifying individual visitors.

Yahoo Finance API

We use Yahoo Finance API (via yfinance library) to retrieve real-time market data for portfolio calculations. Stock ticker information you enter may be sent to Yahoo Finance servers.

Data Security

We implement appropriate technical and organizational security measures to protect your personal information against unauthorized access, alteration, disclosure, or destruction. These measures include:

  • Encryption of data in transit using SSL/TLS protocols
  • Secure server infrastructure and regular security updates
  • Access controls and authentication mechanisms
  • Regular security assessments and monitoring

However, no method of transmission over the Internet or electronic storage is 100% secure. While we strive to protect your personal information, we cannot guarantee its absolute security.

Data Retention

We retain your personal information only for as long as necessary to fulfill the purposes outlined in this Privacy Policy, unless a longer retention period is required or permitted by law. Portfolio calculation data is typically stored temporarily and may be deleted periodically.

Your Rights

Depending on your location, you may have certain rights regarding your personal information:

  • Access: Request access to your personal information
  • Correction: Request correction of inaccurate information
  • Deletion: Request deletion of your personal information
  • Portability: Request a copy of your data in a portable format
  • Objection: Object to processing of your personal information
  • Withdrawal: Withdraw consent for data processing

To exercise these rights, please contact us at privacy@quantstock.cc.

Children's Privacy

Our services are not intended for individuals under the age of 18. We do not knowingly collect personal information from children. If you are a parent or guardian and believe your child has provided us with personal information, please contact us immediately.

International Data Transfers

Your information may be transferred to and maintained on computers located outside of your state, province, country, or other governmental jurisdiction where data protection laws may differ. We ensure appropriate safeguards are in place for such transfers.

Changes to This Privacy Policy

We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last updated" date. You are advised to review this Privacy Policy periodically for any changes.

Contact Us

If you have any questions about this Privacy Policy or our data practices, please contact us:

By using QuantStock, you acknowledge that you have read and understood this Privacy Policy and agree to its terms.