Yorktown Management & Research Co Inc holds a diversified book of 249 reported positions worth $163.3M as of Q2 2026 (disclosed Jul 23, 2026, a ~23-day 13F lag). This quarter Arxis Inc-A first appears in 13F filings, a listing rather than a purchase; they opened Bloom Energy Corp- A and trimmed Comfort Systems USA Inc. Their largest long position is Comfort Systems USA Inc at 4% of the reported non-option book.
Top-heavy: diversified book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
94% mapped to company sectors
+4 sectors below the cut, 3% 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 Yorktown Management & Research Co Inc
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| Graticule Asia Macro Advisors LLC | 12 / 80 | $1.3B |
| Hood River Capital Management LLC | 24 / 80 | $4.9B |
| American Capital Management Inc | 9 / 80 | $550.4M |
| Williamson Legacy Group, LLC | 14 / 80 | $45.9M |
| Science & Technology Partners, L.P. | 14 / 80 | $125.6M |
| Lisanti Capital Growth, LLC | 19 / 80 | $95.3M |
| KR Capital LP | 11 / 80 | $202.5M |
| Aubrey Capital Management Ltd | 8 / 80 | $31.4M |
Ranked by the share of each fund's own book sitting in the names it shares with Yorktown Management & Research Co 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 | Comfort Systems USA, Inc. COM | $5.9M | 3.0K | 3.6% | ▼−7.8% Reduced · −250 sh | |
| 2 | IES Holdings, Inc. COM | $4.0M | 5.5K | 2.5% | ▼−13% Reduced · −830 sh | |
| 3 | KLA Corporation COM NEW | $2.7M | 8.9K | 1.6% | ▲10× Added · +8K sh | |
| 4 | iShares Convertible Bond ETF CONV BD ETF | $2.4M | 20.0K | 1.5% | ▼−13% Reduced · −3K sh | |
| 5 | SPDR Bloomberg Convertible Securities ETF ST STR CONV ETF | $2.2M | 20.0K | 1.3% | ▼−13% Reduced · −3K sh | |
| 6 | Vanguard Emerging Markets Government Bond ETF EM MK GOV BD ETF | $2.0M | 30.0K | 1.2% | —Held | |
| 7 | Guardant Health, Inc. COM | $1.9M | 12.5K | 1.1% | ▲+41% Added · +4K sh | |
| 8 | StoneX Group, Inc. COM | $1.9M | 15.8K | 1.1% | —Held | |
| 9 | Fabrinet SHS | $1.8M | 3.1K | 1.1% | ▼−17% Reduced · −650 sh | |
| 10 | Nova Ltd. COM | $1.7M | 3.2K | 1.1% | ▼−15% Reduced · −560 sh | |
| 11 | ACM Research, Inc. COM CL A | $1.7M | 13.3K | 1.0% | —Held | |
| 12 | Arista Networks, Inc. COM SHS | $1.7M | 9.8K | 1.0% | —Held | |
| 13 | iShares iBoxx $ Investment Grade Corporate Bond IBOXX INV CP ETF | $1.6M | 15.0K | 1.0% | ▲+7.1% Added · +1K sh | |
| 14 | WESCO International, Inc. COM | $1.6M | 4.5K | 1.0% | —Held | |
| 15 | FTAI Aviation Ltd. SHS | $1.6M | 5.8K | 1.0% | —Held | |
| 16 | CECO Environmental Corporation COM | $1.6M | 17.2K | 1.0% | ▲+33% Added · +4K sh | |
| 17 | Mueller Industries, Inc. COM | $1.5M | 12.4K | 0.9% | ▼−14% Reduced · −2K sh | |
| 18 | RBC Bearings, Inc. COM | $1.3M | 2.0K | 0.8% | —Held | |
| 19 | Bloom Energy Corporation COM CL A | $1.3M | 4.2K | 0.8% | ▲New New position | |
| 20 | Axsome Therapeutics, Inc. COM | $1.2M | 4.8K | 0.7% | ▲+35% Added · +1K sh | |
| 21 | Dycom Industries, Inc. COM | $1.2M | 2.3K | 0.7% | ▲+58% Added · +850 sh | |
| 22 | Woodward, Inc. COM | $1.2M | 2.8K | 0.7% | —Held | |
| 23 | Camtek Ltd. ORD | $1.1M | 7.0K | 0.7% | —Held | |
| 24 | Applied Digital Corporation COM NEW | $1.1M | 30.4K | 0.7% | —Held | |
| 25 | Semtech Corporation COM | $1.1M | 6.8K | 0.7% | ▲New New position | |
| 26 | Modine Manufacturing Company COM | $1.1M | 4.2K | 0.7% | —Held | |
| 27 | Interactive Brokers Group, Inc. COM CL A | $1.1M | 12.4K | 0.7% | —Held | |
| 28 | FirstCash Holdings, Inc. COM | $1.1M | 5.0K | 0.7% | —Held | |
| 29 | Xometry, Inc. CLASS A COM | $1.1M | 11.1K | 0.7% | —Held | |
| 30 | Curtiss-Wright Corporation COM | $1.1M | 1.4K | 0.6% | —Held | |
| 31 | Axon Enterprise, Inc. COM | $1.1M | 1.9K | 0.6% | ▼−29% Reduced · −775 sh | |
| 32 | SPX Technologies, Inc. COM | $1.0M | 4.3K | 0.6% | ▲+57% Added · +2K sh | |
| 33 | Datadog, Inc. CL A COM | $1.0M | 4.0K | 0.6% | —Held | |
| 34 | Digi International, Inc. COM | $1.0M | 13.7K | 0.6% | —Held | |
| 35 | Liquidia Corporation COM NEW | $1.0M | 12.7K | 0.6% | ▲New New position | |
| 36 | IonQ, Inc. COM | $996K | 18.7K | 0.6% | ▲+167% Added · +12K sh | |
| 37 | Installed Building Products, Inc. COM | $988K | 4.3K | 0.6% | ▲+48% Added · +1K sh | |
| 38 | Raymond James Financial, Inc. COM | $981K | 6.5K | 0.6% | —Held | |
| 39 | iShares Preferred and Income Securities ETF PFD AND INCM SEC | $976K | 32.0K | 0.6% | —Held | |
| 40 | Lumentum Holdings, Inc. COM | $965K | 1.1K | 0.6% | —Held | |
| 41 | Forgent Power Solutions, Inc. COM SHS CL A | $961K | 17.2K | 0.6% | ▲New New position | |
| 42 | Casey's General Stores, Inc. COM | $954K | 1.2K | 0.6% | —Held | |
| 43 | Medpace Holdings, Inc. COM | $953K | 1.8K | 0.6% | —Held | |
| 44 | Penumbra, Inc. COM | $947K | 3.0K | 0.6% | —Held | |
| 45 | HA Sustainable Infrastructure Capital, Inc. COM | $920K | 23.6K | 0.6% | —Held | |
| 46 | MasTec, Inc. COM | $915K | 2.2K | 0.6% | —Held | |
| 47 | BWX Technologies, Inc. COM | $915K | 4.7K | 0.6% | —Held | |
| 48 | Monolithic Power Systems, Inc. COM | $899K | 650 | 0.6% | —Held | |
| 49 | LifeStance Health Group, Inc. COM | $895K | 83.6K | 0.5% | ▲New New position | |
| 50 | Celestica, Inc. COM | $894K | 2.5K | 0.5% | —Held |
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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 |
|---|---|---|---|---|---|---|
| Q2 2026 | Jun 30, 2026 | Jul 23, 2026 | 23d | 249 | $163.3M | 13F-HR |
| Q1 2026 | Mar 31, 2026 | Apr 20, 2026 | 20d | 214 | $119.5M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Jan 23, 2026 | 23d | 219 | $125.1M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Oct 29, 2025 | 29d | 206 | $125.4M | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 4, 2025 | 35d | 208 | $104.8M | 13F-HR |
| Q1 2025 | Mar 31, 2025 | Apr 23, 2025 | 23d | 206 | $92.0M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Jan 27, 2025 | 27d | 204 | $104.0M | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Oct 25, 2024 | 25d | 194 | $97.6M | 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. Price-derived performance is withheld until the price-source policy and freshness gate are green.