MBB Public Markets I LLC holds a concentrated book of 25 reported positions worth $925.7M as of Q2 2026 (disclosed Aug 14, 2026, a ~45-day 13F lag). This quarter they opened Landstar System Inc and trimmed Alphabet Inc-CL A. Their largest long position is Progressive Corp at 22% of the reported non-option book. They also disclosed $298K in call options (bullish), shown separately below and excluded from the non-option book.
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.
91% mapped to company sectors
+1 sector 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 MBB Public Markets I LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| Skye Global Management LP | 3 / 25 | $2.5B |
| Nellore Capital Management LLC | 2 / 25 | $350.3M |
| BlueSpruce Investments, LP | 2 / 25 | $246.2M |
| Luma Capital S.A. - SPF | 2 / 25 | $39.8M |
| Kids Capital Management, L.P. | 2 / 25 | $43.7M |
| Draper Asset Management, LLC | 2 / 25 | $64.4M |
| Altarock Partners LP | 2 / 25 | $1.4B |
| ArchPoint Investors | 2 / 25 | $153.3M |
Ranked by the share of each fund's own book sitting in the names it shares with MBB Public Markets I LLC: 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 | Progressive Corp COM | $205.7M | 941.5K | 22.2% | ▲+5.7% Added · +51K sh | |
| 2 | Aercap Holdings NV SHS | $178.5M | 1.22M | 19.3% | ▲+8.0% Added · +91K sh | |
| 3 | Amazon Com Inc COM | $175.3M | 735.5K | 18.9% | ▲+8.0% Added · +54K sh | |
| 4 | Ferguson Enterprises Inc COMMON STOCK NEW | $132.4M | 557.8K | 14.3% | ▲+5.7% Added · +30K sh | |
| 5 | Medline Inc COM CL A | $96.3M | 2.44M | 10.4% | —Held | |
| 6 | Vanguard Mun BD FDS TAX EXEMPT BD | $81.7M | 1.61M | 8.8% | ▲+125% Added · +896K sh | |
| 7 | Eqt Corp COM | $25.3M | 475.0K | 2.7% | —Held | |
| 8 | Alphabet Inc CAP STK CL A | $14.3M | 40.0K | 1.5% | ▼−56% Reduced · −50K sh | |
| 9 | Teck Resources Ltd CL B | $7.1M | 120.2K | 0.8% | ▼−63% Reduced · −203K sh | |
| 10 | Kyverna Therapeutics Inc COM | $5.5M | 614.5K | 0.6% | —Held | |
| 11 | Garrett Motion Inc COM | $571K | 15.8K | 0.1% | —Held | |
| 12 | Element Solutions Inc COM | $355K | 7.4K | <0.1% | —Held | |
| 13 | Affiliated Managers Group COM | $303K | 894 | <0.1% | —Held | |
| 14 | Viemed Healthcare Inc COM | $267K | 23.4K | <0.1% | —Held | |
| 15 | Saia Inc COM | $260K | 618 | <0.1% | —Held | |
| 16 | Landstar Sys Inc COM | $235K | 1.1K | <0.1% | ▲New New position | |
| 17 | Rush Enterprises Inc CL A | $233K | 3.2K | <0.1% | —Held | |
| 18 | Installed BLDG Prods Inc COM | $230K | 1.0K | <0.1% | —Held | |
| 19 | Unifirst Corp Mass COM | $226K | 854 | <0.1% | —Held | |
| 20 | Lantheus Hldgs Inc COM | $224K | 2.0K | <0.1% | ▲New New position | |
| 21 | Frontdoor Inc COM | $218K | 2.8K | <0.1% | ▲New New position | |
| 22 | International Money Express COM | $205K | 14.2K | <0.1% | —Held | |
| 23 | Adapthealth Corp COMMON STOCK | $189K | 18.1K | <0.1% | —Held | |
| 24 | Hillman Solutions Corp COM | $183K | 21.6K | <0.1% | —Held | |
| 25 | Janus International Group In COMMON STOCK | $110K | 19.8K | <0.1% | —Held |
This fund 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/1892378/holdings"
Use Arkolith to show MBB PUBLIC MARKETS I LLC'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 | AMAZON.COM INCAMZN | $298K | 1K |
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.
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. Price-derived performance is withheld until the price-source policy and freshness gate are green.