Check Capital Management Inc holds a concentrated book of 49 reported positions worth $1.6B as of Q1 2026 (disclosed May 4, 2026, a ~34-day 13F lag). This quarter they trimmed Alphabet. Their largest long position is Berkshire Hathaway Inc-CL B at 33% of the reported non-option book. They also disclosed $1.8B in call options (bullish), shown separately below and excluded from the non-option book. Cloning the disclosed picks since 2013 would be +210% (+9.2%/yr). That is a simulation of the disclosed long book, not audited returns.
Check Capital Management Inc is a market maker: this book is hedging inventory, not directional conviction.
The reported book (valued from quarter-end) returned +303.4%, a 92.9-point gap that is the cost of the ~34-day 13F disclosure lag a real follower can't avoid.
Growth of $10,000 cloning Check Capital Management Inc's disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~34 days for the latest filing, with no look-ahead), total-return basis (dividends reinvested), derived from end-of-day prices. “Their reported book” values the same picks from quarter-end, before they were public. S&P 500 is SPY total return over the same window. Excludes shorts, cash, options and non-13F holdings. Not investment advice.
Top-heavy: concentrated book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
85% mapped to company sectors
+4 sectors below the cut, under 0.5% together
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices (an exit at the prior quarter-end), no cost basis
Other tracked managers holding the same core names as Check Capital Management Inc
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| GLP Holdings LLLP | 4 / 49 | $111.3M |
| Mirae Asset Global Investments Co., Ltd. | 37 / 49 | $274.6B |
| Prospect Hill Management, LLC | 5 / 49 | $219.0M |
| H&H International Investment, LLC | 7 / 49 | $15.7B |
| Hoffman, Alan N Investment Management | 5 / 49 | $134.2M |
| 9823 Capital, L.P. | 8 / 49 | $115.3M |
| AdviceOne Advisory Services, LLC | 14 / 49 | $133.8M |
| Marest Capital, LLC | 8 / 49 | $151.8M |
Ranked by the share of each fund's own book sitting in the names it shares with Check Capital Management Inc: only funds sharing at least a tenth of the book qualify. Index giants, bank custody books and market makers are excluded. They hold everything, so their overlap says nothing.
Bars show each position's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Berkshire Hathaway COM | $531.1M | 1.11M | 32.7% | ▲+0.5% Added · +6K sh | |
| 2 | Alphabet COM | $198.0M | 690.4K | 12.2% | ▼−1.9% Reduced · −13K sh | |
| 3 | Brookfield Corp. COM | $177.3M | 4.38M | 10.9% | ▼−0.2% Reduced · −9K sh | |
| 4 | Markel COM | $147.2M | 76.9K | 9.1% | ▼−0.6% Reduced · −427 sh | |
| 5 | AerCap Holdings COM | $112.2M | 817.7K | 6.9% | ▼−1.2% Reduced · −10K sh | |
| 6 | First Citizens COM | $83.1M | 44.1K | 5.1% | ▲+3.0% Added · +1K sh | |
| 7 | Sirius XM COM | $67.9M | 2.94M | 4.2% | ▲+2.0% Added · +59K sh | |
| 8 | LKQ Corp COM | $56.3M | 1.92M | 3.5% | ▲+23% Added · +359K sh | |
| 9 | Amazon COM | $42.5M | 204.1K | 2.6% | ▲59× Added · +201K sh | |
| 10 | Disney (Walt) COM | $42.3M | 438.5K | 2.6% | ▲+0.4% Added · +2K sh | |
| 11 | Hershey Foods COM | $40.0M | 192.3K | 2.5% | ▲+0.8% Added · +2K sh | |
| 12 | Cimpress COM | $34.4M | 471.5K | 2.1% | ▲+16% Added · +65K sh | |
| 13 | Jefferies COM | $28.1M | 680.2K | 1.7% | ▲+50% Added · +228K sh | |
| 14 | Berkshire Hathaway 'A' COM | $20.8M | 29 | 1.3% | —Held | |
| 15 | Wayfair COM | $12.6M | 167.9K | 0.8% | ▲+0.5% Added · +756 sh | |
| 16 | Apple COM | $5.9M | 23.1K | 0.4% | ▼−9.1% Reduced · −2K sh | |
| 17 | Biglari Cl A COM | $2.7M | 1.6K | 0.2% | ▼−28% Reduced · −622 sh | |
| 18 | Microsoft COM | $2.3M | 6.1K | 0.1% | ▼−0.8% Reduced · −47 sh | |
| 19 | Amgen COM | $1.4M | 3.9K | 0.1% | —Held | |
| 20 | Caterpillar Tractor COM | $1.2M | 1.7K | 0.1% | —Held | |
| 21 | Alphabet Class A COM | $1.1M | 3.7K | 0.1% | ▲+1.6% Added · +60 sh | |
| 22 | Trupanion Inc. COM | $1.0M | 40.7K | 0.1% | ▼−0.2% Reduced · −85 sh | |
| 23 | Goldman Sachs COM | $1.0M | 1.2K | 0.1% | —Held | |
| 24 | Tesla Motors COM | $929K | 2.5K | 0.1% | —Held | |
| 25 | General Electric COM | $848K | 3.0K | 0.1% | ▼−7.7% Reduced · −250 sh | |
| 26 | GE Vernova COM | $786K | 901 | <0.1% | ▼−8.8% Reduced · −87 sh | |
| 27 | Corning COM | $687K | 5.0K | <0.1% | —Held | |
| 28 | Raytheon Technologies COM | $673K | 3.5K | <0.1% | —Held | |
| 29 | SPDR S&P 500 ETF | $628K | 965 | <0.1% | —Held | |
| 30 | IShares Exponential Technologi ETF | $600K | 8.8K | <0.1% | —Held | |
| 31 | Bank of America COM | $587K | 12.0K | <0.1% | ▼−85% Reduced · −68K sh | |
| 32 | Brookfield Asset Management COM | $576K | 13.0K | <0.1% | ▲+1.3% Added · +168 sh | |
| 33 | Fairfax Finl Hldgs COM | $372K | 219 | <0.1% | ▲+65% Added · +86 sh | |
| 34 | Nvidia COM | $369K | 2.1K | <0.1% | —Held | |
| 35 | Fastenal COM | $367K | 7.9K | <0.1% | —Held | |
| 36 | FedEx COM | $354K | 993 | <0.1% | ▼−56% Reduced · −1K sh | |
| 37 | Wells Fargo COM | $351K | 4.4K | <0.1% | ▼−12% Reduced · −625 sh | |
| 38 | Uber COM | $350K | 4.9K | <0.1% | —Held | |
| 39 | Conocophillips COM | $334K | 2.5K | <0.1% | —Held | |
| 40 | UnitedHealth COM | $333K | 1.2K | <0.1% | ▲+71% Added · +513 sh | |
| 41 | Biglari Holdings COM | $319K | 967 | <0.1% | ▼−28% Reduced · −373 sh | |
| 42 | Boeing Co COM | $288K | 1.4K | <0.1% | ▲+16% Added · +200 sh | |
| 43 | Illinois Tool Works COM | $286K | 1.1K | <0.1% | —Held | |
| 44 | Schwab US Large Cap Growth COM | $285K | 9.8K | <0.1% | —Held | |
| 45 | JPMorgan Chase COM | $281K | 956 | <0.1% | ▲+0.1% Added · +1 sh | |
| 46 | Chevron COM | $279K | 1.4K | <0.1% | —Held | |
| 47 | Quest Diagnostics COM | $255K | 1.3K | <0.1% | —Held | |
| 48 | Verizon COM | $241K | 4.8K | <0.1% | ▼−18% Reduced · −1K sh | |
| 49 | Citizens Financial Group COM | $228K | 3.8K | <0.1% | —Held |
This market maker page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1032814/holdings"
Use Arkolith to show CHECK CAPITAL MANAGEMENT INC/CA's latest holdings, largest changes, and filing provenance.
Put / call positions from the 13F — totals include every disclosed option leg
| Type | Underlying | Notional value | Underlying shares |
|---|---|---|---|
| CALL · bullish | BERKSHIRE HATHAWAY INC-CL BBRK/B | $1.8B | 3.8M |
13F filers disclose option positions at the market value of the underlying the contracts reference, not the premium paid. A put is a bearish bet (it gains if the stock falls); a call is bullish. “Underlying shares” is the share count the contracts control, not a share holding. These legs are excluded from the non-option book, weighting, concentration and sector figures above.
As-of date vs the date the SEC received each filing
Reported 13F total per quarter. Raw filing totals can include option notional.
| Quarter | As of | Filed | Lag | Positions | Value | Form |
|---|---|---|---|---|---|---|
| Q1 2026 | Mar 31, 2026 | May 4, 2026 | 34d | 66 | $3.4B | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 6, 2026 | 37d | 75 | $3.4B | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 6, 2025 | 37d | 70 | $3.0B | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Jul 25, 2025 | 25d | 67 | $3.0B | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 2, 2025 | 32d | 69 | $3.4B | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Jan 30, 2025 | 30d | 77 | $3.4B | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 6, 2024 | 37d | 72 | $3.2B | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Jul 25, 2024 | 25d | 68 | $3.0B | 13F-HR |
| Q1 2024 | Mar 31, 2024 | Apr 19, 2024 | 19d | 66 | $3.0B | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Jan 31, 2024 | 31d | 70 | $2.7B | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Jan 31, 2024 | 123d | 68 | $2.6B | 13F-HR/A |
| Q2 2023 | Jun 30, 2023 | Jan 31, 2024 | 215d | 58 | $2.5B | 13F-HR/A |
| Q1 2023 | Mar 31, 2023 | Jan 31, 2024 | 306d | 60 | $2.2B | 13F-HR/A |
| Q4 2022 | Dec 31, 2022 | Jan 31, 2024 | 396d | 68 | $2.1B | 13F-HR/A |
| Q3 2022 | Sep 30, 2022 | Nov 2, 2022 | 33d | 67 | $1.9B | 13F-HR |
| Q2 2022 | Jun 30, 2022 | Jul 28, 2022 | 28d | 66 | $2.0B | 13F-HR |
| Q1 2022 | Mar 31, 2022 | May 9, 2022 | 39d | 66 | $2.6B | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Feb 4, 2022 | 35d | 73 | $2.4B | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Nov 9, 2021 | 40d | 74 | $2.2B | 13F-HR |
| Q2 2021 | Jun 30, 2021 | Aug 9, 2021 | 40d | 76 | $2.2B | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. Book totals and portfolio weights cover reported non-option positions, which can include notes and warrants. Disclosed put/call options are listed separately and excluded from those totals. The performance line is a simulation of the disclosed long book, not an audited return.