What Is a 13F Filing?
A 13F is a quarterly report filed with the SEC by institutional investment managers with over $100 million in assets. It discloses their US equity holdings — essentially showing the world what the "smart money" owns.
This is how we know what Warren Buffett, Ray Dalio, and other legendary investors are buying and selling each quarter.
Who Must File?
💡 13F Filing Requirements
- Any institutional investment manager with $100M+ in qualifying assets
- Includes hedge funds, mutual funds, pension funds, insurance companies
- Must be filed within 45 days of quarter end (Feb 14, May 15, Aug 14, Nov 14)
- Only covers US-listed equities and certain options — no bonds, private investments, or shorts
- Amendments can be filed later if errors are found
How to Read a 13F
| Field | Meaning | Example |
|---|---|---|
| Name of Issuer | Company name | Apple Inc |
| Title of Class | Security type | Common Stock |
| CUSIP | Unique security ID | 037833100 |
| Value (×$1000) | Position value in thousands | $157,890,000 = $157.9B |
| Shares | Number of shares held | 905,560,000 |
| Investment Discretion | Who decides | SOLE = full control |
Limitations and Pitfalls
💡 What 13F Doesn't Show
- 45-day lag — by the time you see it, the information is 6 weeks old
- No short positions — you only see longs, missing the full picture
- No bonds or private investments — only US-listed equities
- No position sizing context — is it a core position or a hedge?
- Confidential treatment — managers can request SEC hide certain positions temporarily
Smart Ways to Use 13F Data
Despite limitations, 13F data is enormously valuable when used correctly:
💡 Effective 13F Analysis
- Track conviction — look for positions being ADDED to, not just held
- New positions matter — a fresh buy signals current confidence
- Look for consensus — when multiple top investors buy the same stock, pay attention
- Compare quarter-over-quarter — changes matter more than snapshots
- Use as idea generation — don't copy blindly, but research their picks
"Don't just look at what they hold. Look at what they're adding. New money reveals current conviction."
💡 13F Guide — Key Summary
- 13F filings reveal quarterly holdings of $100M+ institutional investors
- Filed 45 days after quarter end — significant information lag
- Only covers US equities — no shorts, bonds, or private investments
- Best use: track conviction changes (additions), not static holdings
- Multiple smart money investors buying the same stock = strong signal
- Use Whale Analyzer to automate the analysis across 100+ investors
什么是13F申报？
每年的2月、5月、8月、11月中旬，美国证券交易委员会（SEC）的EDGAR网站上会出现一批新文件。这些文件叫做「13F Holdings Report」——全球最聪明的钱在买什么，就藏在这些文件里。
根据美国联邦法律（Securities Exchange Act Section 13(f)），任何管理超过1亿美元股票资产的机构投资者，都必须在每个季度结束后45天内向SEC提交其持仓明细。这是强制性的——你不提交，SEC罚你款。
13F里有什么？
一份标准的13F表格包含以下信息：
| 字段 | 含义 | 例子 |
|---|---|---|
| Name of Issuer | 股票名称 | Apple Inc |
| Title of Class | 证券类别 | Common Stock |
| CUSIP | 唯一标识符 | 037833100 |
| Value (x$1000) | 持仓市值（千美元） | 157,348,000 |
| Shares/Quantity | 持股数量 | 905,560,000 |
| Investment Discretion | 投资决策权 | SOLE/SHARED |
| Voting Authority | 投票权 | 905,560,000 |
13F的局限性
13F是免费的「聪明钱」信号源，但它不是万能的。使用时需要注意以下陷阱：
💡 13F数据的已知限制
- 45天延迟——你看到的持仓可能已经被卖了
- 只包含美国上市的股权类证券——不包括非美股、债券、加密资产等
- 不显示做空头寸——只有多头，看不到空头
- 不显示期权和衍生品的完整图景——可能持有对冲头寸
- 只有季末快照——不显示季度中间的买卖操作
- 大额基金可以申请「保密处理」——延迟披露敏感持仓
如何用Whale Analyzer追踪聪明钱
Whale Analyzer解决了13F数据的三大痛点：原始数据难读、跨季度对比困难、信息分散。以下是正确的使用方法：
方法1：追踪顶级投资者的持仓变化
选择你信任的投资者（如巴菲特、Appaloosa、Bridgewater），对比他们最近两个季度的持仓变化。重点关注：新买入（New Position）和加仓（Increased）——尤其是多个大佬同时买入同一只股票时，这个信号更值得关注。
方法2：反向指标——大佬在卖什么
卖出信号同样重要。如果几个顶级投资者同时减持同一只股票，这至少值得你去深入研究一下——为什么他们在卖？
方法3：发现共识持仓
某只股票同时出现在10+个顶级投资者的持仓中？说明这个行业或公司得到了广泛认可。但注意——这也意味着「alpha」可能已经不多了。
"13F是一个起点，不是终点。看到巴菲特买了什么，只是你研究的第一步。你还需要搞清楚他为什么买、买了多少比例、以及这是不是适合你的投资。"
💡 13F使用核心要点
- 13F是法律强制的季度持仓披露——管理$100M+的机构必须提交
- 数据有45天延迟——不能用于短线交易
- Whale Analyzer简化了原始数据的读取和跨季度对比
- 重点关注：新买入、加仓、多大佬共同持有的股票
- 13F是研究起点，不是买入信号——永远做自己的分析