Yorktown Management & Research Co Inc holds a diversified book of 249 stocks worth $163.3M as of Q2 2026 (disclosed Jul 23, 2026, a ~45-day 13F lag). This quarter 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 equity book. Cloning the disclosed picks since 2024 would be +18% (+9.8%/yr). That is a simulation of the disclosed long book, not audited returns.
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curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1313559/holdings"
Use Arkolith to show Yorktown Management & Research Co Inc's latest holdings, largest changes, and filing provenance.
Following at the filing date actually beat the quarter-end book by 4.7 points over this window.
Growth of $10,000 cloning Yorktown Management & Research Co Inc's disclosed long 13F book, rebalanced on each filing date (so it reflects the ~45-day reporting lag, 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: 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
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, no cost basis
Other tracked managers holding the same core names as Yorktown Management & Research Co Inc
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| MORGAN STANLEY | 80 / 80 | $29.0B |
| JPMORGAN CHASE & CO | 80 / 80 | $26.3B |
| BANK OF AMERICA CORP /DE/ | 80 / 80 | $22.4B |
| GOLDMAN SACHS GROUP INC | 80 / 80 | $18.3B |
| UBS Group AG | 80 / 80 | $12.2B |
| ROYAL BANK OF CANADA | 80 / 80 | $7.0B |
| WELLS FARGO & COMPANY/MN | 80 / 80 | $6.6B |
| CITIGROUP INC | 80 / 80 | $4.4B |
Ranked by how many of Yorktown Management & Research Co Inc's top 80 disclosed names each fund also holds: a cross-fund conviction signal from the latest 13F of every tracked manager.
Bars show each stock'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 |
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q2 2026 | Jun 30, 2026 | Jul 23, 2026 | 249 | $163.3M | 13F-HR |
| Q1 2026 | Mar 31, 2026 | Apr 20, 2026 | 214 | $119.5M | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Jan 23, 2026 | 219 | $125.1M | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Oct 29, 2025 | 206 | $125.4M | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Aug 4, 2025 | 208 | $104.8M | 13F-HR |
| Q1 2025 | Mar 31, 2025 | Apr 23, 2025 | 206 | $92.0M | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Jan 27, 2025 | 204 | $104.0M | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Oct 25, 2024 | 194 | $97.6M | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly ~45 days after quarter-end. Public domain. The book and weighting are long equity only; 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.