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Yorktown Management & Research Co Inc
Period ended Sep 30, 2026 · Latest filing Oct 28, 2026
These quarterly holdings are delayed and may not include all assets or short positions.
Values are from the reporting date, not current prices or purchase costs.
The same security may appear in multiple rows.
Source: SEC
Reported portfolio value
Quarter-end reported holdings; not current value or investment performance.
View reported values
- Sep 30, 2026: $149,682,310
More quarters will appear as history becomes available.
Top holdings
Top 10 at Sep 30, 2026. Matching entries are combined; security classes and options remain separate. Shares exclude principal amounts; option shares reflect the reported underlying amount.
View top holdings values
- Comfort Systems USA, Inc. · COM · 199908104 · shares: $4,896,106
- IES Holdings, Inc. · COM · 44951W106 · shares: $3,538,302
- Guardant Health, Inc. · COM · 40131M109 · shares: $2,229,500
- Arista Networks, Inc. · COM SHS · 040413205 · shares: $1,995,182
- KLA Corporation · COM NEW · 482480100 · shares: $1,734,877
- iShares Convertible Bond ETF · CONV BD ETF · 46435G102 · shares: $1,694,025
- CECO Environmental Corporation · COM · 125141101 · shares: $1,692,879
- WESCO International, Inc. · COM · 95082P105 · shares: $1,636,135
- Vanguard Emerging Markets Government Bond ETF · EM MK GOV BD ETF · 921946885 · shares: $1,578,250
- StoneX Group, Inc. · COM · 861896108 · shares: $1,527,120
Reported holdings
252 reported entries| Issuer | Class | CUSIP | Type | Shares / principal | Reported value (USD) |
|---|---|---|---|---|---|
| Comfort Systems USA, Inc. | COM | 199908104 | — | 2,960 shares | $4,896,106 |
| IES Holdings, Inc. | COM | 44951W106 | — | 11,020 shares | $3,538,302 |
| Guardant Health, Inc. | COM | 40131M109 | — | 12,500 shares | $2,229,500 |
| Arista Networks, Inc. | COM SHS | 040413205 | — | 9,800 shares | $1,995,182 |
| KLA Corporation | COM NEW | 482480100 | — | 8,900 shares | $1,734,877 |
| iShares Convertible Bond ETF | CONV BD ETF | 46435G102 | — | 15,000 shares | $1,694,025 |
| CECO Environmental Corporation | COM | 125141101 | — | 24,309 shares | $1,692,879 |
| WESCO International, Inc. | COM | 95082P105 | — | 4,550 shares | $1,636,135 |
| Vanguard Emerging Markets Government Bond ETF | EM MK GOV BD ETF | 921946885 | — | 25,000 shares | $1,578,250 |
| StoneX Group, Inc. | COM | 861896108 | — | 23,625 shares | $1,527,120 |
| SPDR Bloomberg Convertible Securities ETF | ST STR CONV ETF | 78464A359 | — | 15,000 shares | $1,517,700 |
| iShares iBoxx $ Investment Grade Corporate Bond | IBOXX INV CP ETF | 464287242 | — | 14,000 shares | $1,430,520 |
| Fabrinet | SHS | G3323L100 | — | 3,150 shares | $1,336,451 |
| Semtech Corporation | COM | 816850101 | — | 6,850 shares | $1,221,698 |
| Mueller Industries, Inc. | COM | 624756102 | — | 19,100 shares | $1,157,651 |
| Bloom Energy Corporation | COM CL A | 093712107 | — | 4,150 shares | $1,149,467 |
| Xometry, Inc. | CLASS A COM | 98423F109 | — | 11,050 shares | $1,136,493 |
| Medpace Holdings, Inc. | COM | 58506Q109 | — | 1,800 shares | $1,123,524 |
| Datadog, Inc. | CL A COM | 23804L103 | — | 4,000 shares | $1,095,400 |
| Camtek Ltd. | ORD | M20791105 | — | 7,050 shares | $1,094,513 |
| Lumentum Holdings, Inc. | COM | 55024U109 | — | 1,125 shares | $1,092,668 |
| ACM Research, Inc. | COM CL A | 00108J109 | — | 13,300 shares | $1,076,236 |
| Interactive Brokers Group, Inc. | COM CL A | 45841N107 | — | 12,400 shares | $1,059,208 |
| FirstCash Holdings, Inc. | COM | 33768G107 | — | 4,950 shares | $1,045,589 |
| Digi International, Inc. | COM | 253798102 | — | 13,700 shares | $1,044,351 |
| Raymond James Financial, Inc. | COM | 754730109 | — | 6,450 shares | $1,019,229 |
| Nova Ltd. | COM | M7516K103 | — | 2,640 shares | $1,016,928 |
| LifeStance Health Group, Inc. | COM | 53228F101 | — | 83,600 shares | $1,005,708 |
| Twist Bioscience Corporation | COM | 90184D100 | — | 5,100 shares | $985,524 |
| RBC Bearings, Inc. | COM | 75524B104 | — | 1,970 shares | $983,483 |
| RingCentral, Inc. | CL A | 76680R206 | — | 13,050 shares | $974,835 |
| FTAI Aviation Ltd. | SHS | G3730V105 | — | 5,800 shares | $968,774 |
| Axos Financial, Inc. | COM | 05465C100 | — | 11,150 shares | $965,256 |
| Penumbra, Inc. | COM | 70975L107 | — | 3,000 shares | $955,020 |
| Unity Software, Inc. | COM | 91332U101 | — | 22,550 shares | $922,972 |
| Insmed, Inc. | COM PAR $.01 | 457669307 | — | 7,925 shares | $904,560 |
| Woodward, Inc. | COM | 980745103 | — | 2,750 shares | $903,623 |
| Axsome Therapeutics, Inc. | COM | 05464T104 | — | 4,850 shares | $894,292 |
| Celestica, Inc. | COM | 15101Q207 | — | 2,450 shares | $885,504 |
| Fortinet, Inc. | COM | 34959E109 | — | 4,950 shares | $884,862 |
| Monolithic Power Systems, Inc. | COM | 609839105 | — | 650 shares | $875,693 |
| LPL Financial Holdings, Inc. | COM | 50212V100 | — | 2,850 shares | $871,530 |
| Halozyme Therapeutics, Inc. | COM | 40637H109 | — | 7,850 shares | $866,640 |
| HA Sustainable Infrastructure Capital, Inc. | COM | 41068X100 | — | 23,550 shares | $843,561 |
| Palo Alto Networks, Inc. | COM | 697435105 | — | 2,090 shares | $830,378 |
| Customers Bancorp, Inc. | COM | 23204G100 | — | 11,200 shares | $828,800 |
| Installed Building Products, Inc. | COM | 45780R101 | — | 4,300 shares | $825,084 |
| Gold Fields Ltd. | SPONSORED ADR | 38059T106 | — | 22,750 shares | $821,730 |
| IonQ, Inc. | COM | 46222L108 | — | 18,700 shares | $820,182 |
| GRAIL, Inc. | COM | 384747101 | — | 5,750 shares | $805,690 |
| Axon Enterprise, Inc. | COM | 05464C101 | — | 1,875 shares | $792,225 |
| Ensign Group, Inc. (The) | COM | 29358P101 | — | 4,600 shares | $791,200 |
| Chefs' Warehouse, Inc. (The) | COM | 163086101 | — | 7,050 shares | $790,799 |
| Modine Manufacturing Company | COM | 607828100 | — | 4,150 shares | $776,880 |
| iShares iBoxx $ High Yield Corporate Bond ETF | IBOXX HI YD ETF | 464288513 | — | 10,000 shares | $772,100 |
| TG Therapeutics, Inc. | COM | 88322Q108 | — | 13,700 shares | $764,186 |
| Curtiss-Wright Corporation | COM | 231561101 | — | 1,400 shares | $761,348 |
| Corcept Therapeutics, Inc. | COM | 218352102 | — | 6,500 shares | $748,995 |
| Applied Digital Corporation | COM NEW | 038169207 | — | 30,350 shares | $739,630 |
| Casey's General Stores, Inc. | COM | 147528103 | — | 1,200 shares | $730,152 |
| UMB Financial Corporation | COM | 902788108 | — | 5,600 shares | $728,056 |
| Performance Food Group Company | COM | 71377A103 | — | 7,880 shares | $721,099 |
| Neptune Insurance Holdings, Inc. | CL A | 64073B103 | — | 26,350 shares | $720,673 |
| Argan, Inc. | COM | 04010E109 | — | 1,870 shares | $706,767 |
| TD SYNNEX Corporation | COM | 87162W100 | — | 2,700 shares | $693,495 |
| Embraer S.A. | SPONSORED ADS | 29082A107 | — | 9,200 shares | $692,944 |
| ITT, Inc. | COM | 45073V108 | — | 3,300 shares | $666,006 |
| Krystal Biotech, Inc. | COM | 501147102 | — | 2,000 shares | $665,120 |
| Denali Therapeutics, Inc. | COM | 24823R105 | — | 32,100 shares | $663,507 |
| KKR & Company, Inc. | COM | 48251W104 | — | 7,200 shares | $657,360 |
| Life Time Group Holdings, Inc. | COMMON STOCK | 53190C102 | — | 16,450 shares | $656,026 |
| DigitalOcean Holdings, Inc. | COM | 25402D102 | — | 4,900 shares | $653,611 |
| Hinge Health, Inc. | CL A | 433313103 | — | 6,700 shares | $651,508 |
| PACS Group, Inc. | COM SHS | 69380Q107 | — | 15,600 shares | $648,180 |
| Forgent Power Solutions, Inc. | COM SHS CL A | 34631F102 | — | 17,200 shares | $643,968 |
| BWX Technologies, Inc. | COM | 05605H100 | — | 4,700 shares | $643,900 |
| SharkNinja, Inc. | COM SHS | G8068L108 | — | 3,500 shares | $630,420 |
| Stock Yards Bancorp, Inc. | COM | 861025104 | — | 8,100 shares | $624,429 |
| Saia, Inc. | COM | 78709Y105 | — | 1,840 shares | $614,082 |
| Lithia Motors, Inc. | COM | 536797103 | — | 2,100 shares | $612,843 |
| Sunbelt Rentals Holdings, Inc. | SHS | 866966104 | — | 8,200 shares | $600,322 |
| Brown & Brown, Inc. | COM | 115236101 | — | 9,750 shares | $593,775 |
| iShares Preferred and Income Securities ETF | PFD AND INCM SEC | 464288687 | — | 20,000 shares | $590,000 |
| ESCO Technologies, Inc. | COM | 296315104 | — | 2,225 shares | $589,870 |
| API Group Corporation | COM STK | 00187Y100 | — | 15,150 shares | $584,790 |
| Ciena Corporation | COM NEW | 171779309 | — | 1,650 shares | $580,503 |
| Franklin Electric Company, Inc. | COM | 353514102 | — | 6,000 shares | $575,340 |
| Dlocal Ltd./Uruguay | CLASS A COM | G29018101 | — | 41,500 shares | $571,040 |
| Dave, Inc. | CLASS A COM NEW | 23834J201 | — | 1,750 shares | $562,643 |
| Pampa Energia S.A. | SPONS ADR LVL I | 697660207 | — | 7,200 shares | $559,944 |
| Hamilton Insurance Group Ltd. | CL B | G42706104 | — | 16,900 shares | $558,376 |
| HCI Group, Inc. | COM | 40416E103 | — | 3,200 shares | $556,224 |
| Core & Main, Inc. | CL A | 21874C102 | — | 13,300 shares | $551,684 |
| Beam Therapeutics, Inc. | COM | 07373V105 | — | 22,550 shares | $551,348 |
| Rush Street Interactive, Inc. | COM | 782011100 | — | 26,900 shares | $546,877 |
| Teledyne Technologies, Inc. | COM | 879360105 | — | 900 shares | $546,129 |
| Bruker Corporation | COM | 116794108 | — | 8,400 shares | $543,900 |
| Western Alliance Bancorp | COM | 957638109 | — | 7,200 shares | $540,720 |
| Oscar Health, Inc. | CL A | 687793109 | — | 17,400 shares | $536,616 |
| Neurocrine Biosciences, Inc. | COM | 64125C109 | — | 3,750 shares | $531,900 |