{"id":82801,"title":"Double - Design your own stock index","tagline":"Double automates your investments with zero AUM fees.","body":"![uploaded image](/media/?type=post\u0026id=82801\u0026key=user_uploads/1289064/c2a6166e-82a3-419a-9800-0648a58901ea)\n\n**TL; DR** — Design and invest in your own stock index that’s advised, managed, and tax-optimized by [Double](https://double.finance/).\n\nHistorically, access to sophisticated finance tools like direct indexing and tax loss harvesting has come at a steep cost and only through exclusive financial advisors. We are on a mission to revolutionize investing by providing world-class portfolio tools to everyday investors without any AUM fees. \n\n# Key Features\n\n* **Direct Index into 20+ ETFs:** Build an elite portfolio with the ability to tilt towards specific sectors, industries, themes, or even custom groupings like all YC publicly listed companies.\n* **Daily Tax Optimization, Rebalancing \u0026 Potential Tax Loss Harvesting**: Our optimization engine keeps your portfolio on track by factoring in drift, taxes and transaction costs. If your account qualifies, our tax-loss harvesting service aims to help you minimize your tax liability and maximize your after-tax returns.\n* **Dollar-cost averaging:** We allow users to move between positions at a set cadence, regardless of the market's performance, helping you reduce timing risks associated with active trading.\n\n# Example Use Cases\n\nWork for AAPL and want to diversify away from tech?\n\n* Buy a direct-indexed [S\u0026P 500 Portfolio](https://app.double.finance/public/explore/3), remove AAPL entirely, and cut the rest of your tech exposure in half.\n\nDid you know AI was going to be a big deal before everyone else?\n\n* Double makes it easy to tilt your portfolio towards your hunches. Pick a handful of stocks set to benefit from the Inflation Reduction Act, or some that target the booming AI and semiconductor industry, or shift your portfolio towards the explosive meme growth of Zyn.\n\nFeeling confident in the overall market and ready to pile on the risk?\n\n* Follow [Hedgefundie’s Adventure](https://app.double.finance/explore/110), which uses 3x leverage in a Stock and Bond ETF to try and increase returns. Or pick from our smart screens that target top growing companies or even a basket of the [YC Public Companies](https://app.double.finance/public/explore/140).\n\nThink we’re headed for a recession and want to take some chips off the table? \n\n* You can invest in a version of [Ray Dalio’s All Weather Portfolio](https://app.double.finance/public/explore/108) comprising 5 ETFs or [John Bogles Majesty of Simplicity](https://app.double.finance/public/explore/105) and migrate between these Strategies and Bonds over time.\n\nBuild and backtest your own stock index!\n\n* Use our Stock and ETF Screeners to build your very own personalized portfolio.\n\n#### Fees\n\nDouble doesn’t charge AUM fees. Financial Advisors often charge around 1% a year for tools like Direct Indexing and Dollar Cost Averaging. In a sample $1M portfolio, these fees lead to a dollar cost of $1,800,000 or a 24.5% overall reduction in performance over 30 years, assuming 6% growth vs. 7% growth. We aim to eventually make money like the commission-free trading pioneers. Our custodian Apex Clearing charges some fees which we pass on to users which you can see [here](https://help.double.finance/en/articles/9450171-service-provider-fees). \n\n#### Additional Features\n\n* Backtest a custom stock grouping to see its historic performance.\n* Cash sweep available: Earn 4.5% interest on your uninvested cash (as of August 5th, 2024, not a guarantee of future rates)\n* Fractional investing: Invest in over 3,000 US stocks and 1,400 ETFs for as little as $5 per share.\n* Support for Personal, Joint, and Trust Accounts\n* Daily portfolio optimization and trade execution\n* Recurring or one-time deposits via ACH or Wire\n* ACAT Transfer in an existing brokerage account\n\n#### Get Started Today\n\nWe’re live at \u003chttps://double.finance\u003e. Sign up for a Double account today and start building your own stock index. Please reach out to [founders@double.finance](mailto:founders@double.finance) with any feedback or questions!\n\n![](https://lh7-rt.googleusercontent.com/docsz/AD_4nXctLsEGUWaE1ScP7EqAuz0sPPYQDg7Vt1Zlpn5Cx-sfubv0nJvIZertGsNS0zPWoWzzJSw-orkpmSTzIFepxiDziCKdJN6sMXMAS1GSYwcTfiyY3ZqlIA_db-gZX4rHTji2-dZPfMWgdz-qmvb7whdOackQ?key=nGDLEdHNSqYCi809_9DeNQ)\n\n","slug":"LXV-double-design-your-own-stock-index","created_at":"2024-08-07T00:27:48.572Z","updated_at":"2026-05-24T00:31:06.410Z","total_vote_count":58,"url":"https://www.ycombinator.com/launches/LXV-double-design-your-own-stock-index","share_image_url":"https://lh7-rt.googleusercontent.com/docsz/AD_4nXctLsEGUWaE1ScP7EqAuz0sPPYQDg7Vt1Zlpn5Cx-sfubv0nJvIZertGsNS0zPWoWzzJSw-orkpmSTzIFepxiDziCKdJN6sMXMAS1GSYwcTfiyY3ZqlIA_db-gZX4rHTji2-dZPfMWgdz-qmvb7whdOackQ?key=nGDLEdHNSqYCi809_9DeNQ","company":{"id":29332,"name":"Polished","slug":"polished","url":"https://polished.ad","logo":"https://bookface-images.s3.amazonaws.com/small_logos/b6b130da6813f93f556cf04be9132b6ba506b4fc.png","batch":"Winter 2024","industry":"B2B","tags":["Artificial Intelligence","Developer Tools","SaaS","B2B","Advertising"],"search_path":"https://bookface.ycombinator.com/company/29332"}}