Largest positions
| Issuer | Class | Value | Share |
|---|---|---|---|
| Comfort Systems USA, Inc..COM | COM | $5.87M | 3.6% |
| Ies Holdings, Inc..COM | COM | $4.05M | 2.5% |
| KLA CorporationCOM NEW | COM NEW | $2.69M | 1.6% |
| iShares Convertible Bond ETFCONV BD ETF | CONV BD ETF | $2.43M | 1.5% |
| SPDR Bloomberg Convertible Securities ETFST STR CONV ETF | ST STR CONV ETF | $2.16M | 1.3% |
| Vanguard Emerging Markets Government Bond ETFEM MK GOV BD ETF | EM MK GOV BD ETF | $2.02M | 1.2% |
| Guardant Health, Inc..COM | COM | $1.88M | 1.1% |
| Stonex Group, Inc..COM | COM | $1.87M | 1.1% |
| FabrinetSHS | SHS | $1.77M | 1.1% |
| Nova Ltd.COM | COM | $1.75M | 1.1% |
| Acm Research, Inc..COM CL A | COM CL A | $1.69M | 1.0% |
| Arista Networks, Inc..COM SHS | COM SHS | $1.66M | 1.0% |
| iShares Iboxx $ Investment Grade Corporate BondIBOXX INV CP ETF | IBOXX INV CP ETF | $1.64M | 1.0% |
| Wesco International, Inc..COM | COM | $1.57M | 1.0% |
| Ftai Aviation Ltd.SHS | SHS | $1.57M | 1.0% |
| Ceco Environmental CorporationCOM | COM | $1.56M | 1.0% |
| Mueller Industries, Inc..COM | COM | $1.52M | 0.9% |
| Rbc Bearings, Inc..COM | COM | $1.27M | 0.8% |
| Bloom Energy CorporationCOM CL A | COM CL A | $1.26M | 0.8% |
| Axsome Therapeutics, Inc..COM | COM | $1.19M | 0.7% |
| Dycom Industries, Inc..COM | COM | $1.18M | 0.7% |
| Woodward, Inc..COM | COM | $1.17M | 0.7% |
| Camtek Ltd.ORD | ORD | $1.15M | 0.7% |
| Applied Digital CorporationCOM NEW | COM NEW | $1.13M | 0.7% |
| Semtech CorporationCOM | COM | $1.11M | 0.7% |
| Modine Manufacturing CompanyCOM | COM | $1.11M | 0.7% |
| Interactive Brokers Group, Inc..COM CL A | COM CL A | $1.08M | 0.7% |
| Firstcash Holdings, Inc..COM | COM | $1.07M | 0.7% |
| Xometry, Inc..CLASS A COM | CLASS A COM | $1.07M | 0.7% |
| Curtiss-wright CorporationCOM | COM | $1.06M | 0.6% |
| Axon Enterprise, Inc..COM | COM | $1.05M | 0.6% |
| Spx Technologies, Inc..COM | COM | $1.04M | 0.6% |
| Datadog, Inc..CL A COM | CL A COM | $1.04M | 0.6% |
| Digi International, Inc..COM | COM | $1.03M | 0.6% |
| Liquidia CorporationCOM NEW | COM NEW | $1.01M | 0.6% |
| Ionq, Inc..COM | COM | $996K | 0.6% |
| Installed Building Products, Inc..COM | COM | $988K | 0.6% |
| Raymond James Financial, Inc..COM | COM | $981K | 0.6% |
| iShares Preferred And Income Securities ETFPFD AND INCM SEC | PFD AND INCM SEC | $976K | 0.6% |
| Lumentum Holdings, Inc..COM | COM | $965K | 0.6% |
| Forgent Power Solutions, Inc..COM SHS CL A | COM SHS CL A | $961K | 0.6% |
| Casey's General Stores, Inc..COM | COM | $954K | 0.6% |
| Medpace Holdings, Inc..COM | COM | $953K | 0.6% |
| Penumbra, Inc..COM | COM | $947K | 0.6% |
| HA Sustainable Infrastructure Capital, Inc..COM | COM | $920K | 0.6% |
| Mastec, Inc..COM | COM | $915K | 0.6% |
| Bwx Technologies, Inc..COM | COM | $915K | 0.6% |
| Monolithic Power Systems, Inc..COM | COM | $899K | 0.6% |
| Lifestance Health Group, Inc..COM | COM | $895K | 0.5% |
| Celestica, Inc..COM | COM | $894K | 0.5% |
Comfort Systems USA, Inc..COM$5.87M
- Class
- COM
- Share
- 3.6%
Ies Holdings, Inc..COM$4.05M
- Class
- COM
- Share
- 2.5%
KLA CorporationCOM NEW$2.69M
- Class
- COM NEW
- Share
- 1.6%
iShares Convertible Bond ETFCONV BD ETF$2.43M
- Class
- CONV BD ETF
- Share
- 1.5%
SPDR Bloomberg Convertible Securities ETFST STR CONV ETF$2.16M
- Class
- ST STR CONV ETF
- Share
- 1.3%
Vanguard Emerging Markets Government Bond ETFEM MK GOV BD ETF$2.02M
- Class
- EM MK GOV BD ETF
- Share
- 1.2%
Guardant Health, Inc..COM$1.88M
- Class
- COM
- Share
- 1.1%
Stonex Group, Inc..COM$1.87M
- Class
- COM
- Share
- 1.1%
FabrinetSHS$1.77M
- Class
- SHS
- Share
- 1.1%
Nova Ltd.COM$1.75M
- Class
- COM
- Share
- 1.1%
Acm Research, Inc..COM CL A$1.69M
- Class
- COM CL A
- Share
- 1.0%
Arista Networks, Inc..COM SHS$1.66M
- Class
- COM SHS
- Share
- 1.0%
iShares Iboxx $ Investment Grade Corporate BondIBOXX INV CP ETF$1.64M
- Class
- IBOXX INV CP ETF
- Share
- 1.0%
Wesco International, Inc..COM$1.57M
- Class
- COM
- Share
- 1.0%
Ftai Aviation Ltd.SHS$1.57M
- Class
- SHS
- Share
- 1.0%
Ceco Environmental CorporationCOM$1.56M
- Class
- COM
- Share
- 1.0%
Mueller Industries, Inc..COM$1.52M
- Class
- COM
- Share
- 0.9%
Rbc Bearings, Inc..COM$1.27M
- Class
- COM
- Share
- 0.8%
Bloom Energy CorporationCOM CL A$1.26M
- Class
- COM CL A
- Share
- 0.8%
Axsome Therapeutics, Inc..COM$1.19M
- Class
- COM
- Share
- 0.7%
Dycom Industries, Inc..COM$1.18M
- Class
- COM
- Share
- 0.7%
Woodward, Inc..COM$1.17M
- Class
- COM
- Share
- 0.7%
Camtek Ltd.ORD$1.15M
- Class
- ORD
- Share
- 0.7%
Applied Digital CorporationCOM NEW$1.13M
- Class
- COM NEW
- Share
- 0.7%
Semtech CorporationCOM$1.11M
- Class
- COM
- Share
- 0.7%
Modine Manufacturing CompanyCOM$1.11M
- Class
- COM
- Share
- 0.7%
Interactive Brokers Group, Inc..COM CL A$1.08M
- Class
- COM CL A
- Share
- 0.7%
Firstcash Holdings, Inc..COM$1.07M
- Class
- COM
- Share
- 0.7%
Xometry, Inc..CLASS A COM$1.07M
- Class
- CLASS A COM
- Share
- 0.7%
Curtiss-wright CorporationCOM$1.06M
- Class
- COM
- Share
- 0.6%
Axon Enterprise, Inc..COM$1.05M
- Class
- COM
- Share
- 0.6%
Spx Technologies, Inc..COM$1.04M
- Class
- COM
- Share
- 0.6%
Datadog, Inc..CL A COM$1.04M
- Class
- CL A COM
- Share
- 0.6%
Digi International, Inc..COM$1.03M
- Class
- COM
- Share
- 0.6%
Liquidia CorporationCOM NEW$1.01M
- Class
- COM NEW
- Share
- 0.6%
Ionq, Inc..COM$996K
- Class
- COM
- Share
- 0.6%
Installed Building Products, Inc..COM$988K
- Class
- COM
- Share
- 0.6%
Raymond James Financial, Inc..COM$981K
- Class
- COM
- Share
- 0.6%
iShares Preferred And Income Securities ETFPFD AND INCM SEC$976K
- Class
- PFD AND INCM SEC
- Share
- 0.6%
Lumentum Holdings, Inc..COM$965K
- Class
- COM
- Share
- 0.6%
Forgent Power Solutions, Inc..COM SHS CL A$961K
- Class
- COM SHS CL A
- Share
- 0.6%
Casey's General Stores, Inc..COM$954K
- Class
- COM
- Share
- 0.6%
Medpace Holdings, Inc..COM$953K
- Class
- COM
- Share
- 0.6%
Penumbra, Inc..COM$947K
- Class
- COM
- Share
- 0.6%
HA Sustainable Infrastructure Capital, Inc..COM$920K
- Class
- COM
- Share
- 0.6%
Mastec, Inc..COM$915K
- Class
- COM
- Share
- 0.6%
Bwx Technologies, Inc..COM$915K
- Class
- COM
- Share
- 0.6%
Monolithic Power Systems, Inc..COM$899K
- Class
- COM
- Share
- 0.6%
Lifestance Health Group, Inc..COM$895K
- Class
- COM
- Share
- 0.5%
Celestica, Inc..COM$894K
- Class
- COM
- Share
- 0.5%
The share class is shown on a wider screen.
The 50 largest of 249 positions by value, with holdings of the same security combined. The 200 largest are in this firm's machine-readable record. Share counts and quarter-on-quarter changes for each position are on EDGAR. View the full information table on EDGAR
This filing
- Form
- 13F-HR
- CIK
- 1313559
- File number
- 028-12529
- Options
- 0 call, 0 put
- In the 25 largest
- 28.9%
- Prior quarter
- $120M at 31 March 2026
- Positions opened
- 82
- Positions closed
- 47
Common questions
What are Yorktown Management and Research’s 13F holdings worth?
$163 million across 249 positions for the quarter ended 30 June 2026.
What is Yorktown Management and Research’s largest 13F holding?
Comfort Systems USA, Inc. (COM) was the largest position at $5.87 million, or 3.6% of reported 13F value, as of 30 June 2026.
How concentrated is Yorktown Management and Research’s 13F portfolio?
The ten largest positions accounted for 16.2% of reported value and the twenty-five largest for 28.9%, across 249 positions as of 30 June 2026.
Does Form 13F show everything Yorktown Management and Research manages?
No. Form 13F covers only long positions in exchange-traded securities over which the manager has investment discretion, valued at quarter end. It excludes cash, most bonds, private funds, and any assets the firm does not have discretion over, so it is neither the firm's total assets nor any individual client's portfolio.
How often does Yorktown Management and Research file its 13F?
Every quarter. Managers file within 45 days of each quarter's end, so the figures are a snapshot that changes between filings. This page shows the quarter ended 30 June 2026.
Answered from this filing and the prior quarter's.