Yorktown Management & Research Co Inc reported 245 positions worth $141.86M for the quarter ended Sep 30, 2026, down 6.0% on the prior quarter. It opened 24 new positions, added to 6, trimmed 8 and exited 15. Its largest holding is Comfort Systems Usa Inc at 3.5% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| NP Neptune Insurance Holdings Inc. | +26.4K | – | $720.67K | 0.508% |
| BRO Brown & Brown, Inc. | +9,750 | – | $593.78K | 0.419% |
| CGNX Cognex Corp | +8,400 | – | $509.46K | 0.359% |
| WAY Waystar Holding Corp. | +20.1K | – | $508.07K | 0.358% |
| CECO Ceco Environmental Corp | +7,100 | +41.3% | $494.44K | 1.19% |
| CUBI Customers Bancorp, Inc. | +6,350 | +130.9% | $469.90K | 0.584% |
| UMBF Umb Financial Corp | +3,500 | +166.7% | $455.03K | 0.513% |
| AGX Argan Inc | +1,200 | +179.1% | $453.54K | 0.498% |
| AROC Archrock, Inc. | +14.9K | – | $451.32K | 0.318% |
| AX Axos Financial, Inc. | +5,150 | +85.8% | $445.84K | 0.68% |
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| ROAD Construction Partners, Inc. | -4,800 | -100.0% | $570.10K | Exited |
| CIFR Cipher Digital Inc. | -19.7K | -100.0% | $482.65K | Exited |
| FRHC Freedom Holding Corp. | -2,350 | -63.5% | $393.16K | 0.159% |
| UTI Universal Technical Institute Inc | -8,450 | -100.0% | $361.41K | Exited |
| IONS Ionis Pharmaceuticals Inc | -4,400 | -100.0% | $348.88K | Exited |
| MLI Mueller Industries Inc | -5,700 | -23.0% | $345.48K | 0.816% |
| PAGS PagSeguro Digital Ltd. | -37.8K | -100.0% | $342.09K | Exited |
| ALHC Alignment Healthcare, Inc. | -12.3K | -100.0% | $292.86K | Exited |
| FOUR Shift4 Payments, Inc. | -5,700 | -100.0% | $277.25K | Exited |
| ARX Accelerant Holdings | -22.8K | -100.0% | $267.22K | Exited |
| Holding | Shares | Trade Value | Weight |
|---|---|---|---|
| NP Neptune Insurance Holdings Inc. | +26.4K | $720.67K | 0.508% |
| BRO Brown & Brown, Inc. | +9,750 | $593.78K | 0.419% |
| CGNX Cognex Corp | +8,400 | $509.46K | 0.359% |
| WAY Waystar Holding Corp. | +20.1K | $508.07K | 0.358% |
| AROC Archrock, Inc. | +14.9K | $451.32K | 0.318% |
| ADMA Adma Biologics, Inc. | +43.5K | $436.31K | 0.308% |
| AGYS Agilysys Inc | +4,400 | $427.15K | 0.301% |
| GCT GigaCloud Technology Inc | +8,150 | $421.19K | 0.297% |
| ELF e.l.f. Beauty, Inc. | +3,850 | $388.74K | 0.274% |
| SLDE Slide Insurance Holdings, Inc. | +16.9K | $375.92K | 0.265% |
| Holding | Shares Sold | Trade Value | Prior Weight |
|---|---|---|---|
| ROAD Construction Partners, Inc. | -4,800 | $570.10K | 0.378% |
| CIFR Cipher Digital Inc. | -19.7K | $482.65K | 0.32% |
| UTI Universal Technical Institute Inc | -8,450 | $361.41K | 0.239% |
| IONS Ionis Pharmaceuticals Inc | -4,400 | $348.88K | 0.231% |
| PAGS PagSeguro Digital Ltd. | -37.8K | $342.09K | 0.227% |
| ALHC Alignment Healthcare, Inc. | -12.3K | $292.86K | 0.194% |
| FOUR Shift4 Payments, Inc. | -5,700 | $277.25K | 0.184% |
| ARX Accelerant Holdings | -22.8K | $267.22K | 0.177% |
| AMSC American Superconductor Corp | -6,400 | $265.66K | 0.176% |
| KLAR Klarna Group plc | -12.8K | $259.07K | 0.172% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | FIX Comfort Systems Usa Inc | Industrials | 2,960 | $4.90M | 3.45% | 0 | 0.0% | Unchanged | 0.01% |
| 2 | IESC IES Holdings, Inc. | Industrials | 11.0K | $3.54M | 2.49% | 0 | 0.0% | Unchanged | 0.03% |
| 3 | GH Guardant Health, Inc. | Healthcare | 12.5K | $2.23M | 1.57% | 0 | 0.0% | Unchanged | 0.01% |
| 4 | ANET Arista Networks, Inc. | Technology | 9,800 | $2.00M | 1.41% | 0 | 0.0% | Unchanged | 0% |
| 5 | KLAC Kla Corp | Technology | 8,900 | $1.73M | 1.22% | 0 | 0.0% | Unchanged | 0% |
| 6 | CECO Ceco Environmental Corp | Industrials | 24.3K | $1.69M | 1.19% | +7,100 | +41.3% | Added | 0.04% |
| 7 | WCC Wesco International Inc | Industrials | 4,550 | $1.64M | 1.15% | 0 | 0.0% | Unchanged | 0.01% |
| 8 | SNEX StoneX Group Inc. | Financial Services | 23.6K | $1.53M | 1.08% | 0 | 0.0% | Unchanged | 0.02% |
| 9 | FN Fabrinet | Technology | 3,150 | $1.34M | 0.942% | 0 | 0.0% | Unchanged | 0.01% |
| 10 | SMTC Semtech Corp | Technology | 6,850 | $1.22M | 0.861% | 0 | 0.0% | Unchanged | 0.01% |
| 11 | MLI Mueller Industries Inc | Industrials | 19.1K | $1.16M | 0.816% | -5,700 | -23.0% | Reduced | 0.01% |
| 12 | BE Bloom Energy Corp | Industrials | 4,150 | $1.15M | 0.81% | 0 | 0.0% | Unchanged | 0% |
| 13 | XMTR Xometry, Inc. | Technology | 11.1K | $1.14M | 0.801% | 0 | 0.0% | Unchanged | 0.02% |
| 14 | MEDP Medpace Holdings, Inc. | Healthcare | 1,800 | $1.12M | 0.792% | 0 | 0.0% | Unchanged | 0.01% |
| 15 | DDOG Datadog, Inc. | Technology | 4,000 | $1.10M | 0.772% | 0 | 0.0% | Unchanged | 0% |
Tip. Select a row to see that position’s full history at Yorktown Management & Research.
As of its Q3 2026 13F filing, Yorktown Management & Research Co Inc’s five largest positions were Comfort Systems Usa Inc (FIX) at 3.5%, IES Holdings, Inc. (IESC) at 2.5%, Guardant Health, Inc. (GH) at 1.6%, Arista Networks, Inc. (ANET) at 1.4%, Kla Corp (KLAC) at 1.2% of the reported portfolio.
Yorktown Management & Research Co Inc reported a 13F portfolio worth $141.86M across 245 positions for Q3 2026. That is down 6.0% from the previous quarter.
Its largest purchases by value were Neptune Insurance Holdings Inc. ($720.67K), Brown & Brown, Inc. ($593.78K), Cognex Corp ($509.46K). It opened 24 new positions.
Its largest sales by value were Construction Partners, Inc. ($570.10K), Cipher Digital Inc. ($482.65K), Freedom Holding Corp. ($393.16K). It exited 15 positions entirely.
From the Form 13F-HR reports Yorktown Management & Research Co Inc files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.