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Super Investors Yorktown Management & Research Co Inc
YM

Yorktown Management & Research Co Inc

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$150M
Positions
252
Quarter ended
September 30, 2026
Filed
October 28, 2026

Reported portfolio value by quarter (54 quarters reported)

$604M $77.2M
Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q3 26

$474M in Q2 2013 → $150M now. Hover for any quarter.

Holdings

As reported for the quarter ended September 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Comfort Systems Usa, Inc. 3.3% Unchanged 2,960 $4.9M
Ies Holdings, Inc. 2.4% Added 100% 11,020 $3.54M
Guardant Health, Inc. 1.5% Unchanged 12,500 $2.23M
Arista Networks, Inc. 1.3% Unchanged 9,800 $2M
Kla Corporation 1.2% Unchanged 8,900 $1.73M
IC Ishares Convertible Bond ETF 1.1% Trimmed 25% 15,000 $1.69M
Ceco Environmental Corporation 1.1% Added 41% 24,309 $1.69M
Wesco International, Inc. 1.1% Unchanged 4,550 $1.64M
VE Vanguard Emerging Markets Government Bond ETF 1.1% Trimmed 17% 25,000 $1.58M
Stonex Group, Inc. 1.0% Added 50% 23,625 $1.53M
SB SPDR Bloomberg Convertible Securities ETF 1.0% Trimmed 25% 15,000 $1.52M
II Ishares Iboxx $ Investment Grade Corporate Bond 1.0% Trimmed 6.7% 14,000 $1.43M
Fabrinet 0.9% Unchanged 3,150 $1.34M
Semtech Corporation 0.8% Unchanged 6,850 $1.22M
Mueller Industries, Inc. 0.8% Added 54% 19,100 $1.16M
Bloom Energy Corporation 0.8% Unchanged 4,150 $1.15M
Xometry, Inc. 0.8% Unchanged 11,050 $1.14M
Medpace Holdings, Inc. 0.8% Unchanged 1,800 $1.12M
Datadog, Inc. 0.7% Unchanged 4,000 $1.1M
Camtek Ltd. 0.7% Unchanged 7,050 $1.09M
Lumentum Holdings, Inc. 0.7% Unchanged 1,125 $1.09M
Acm Research, Inc. 0.7% Unchanged 13,300 $1.08M
Interactive Brokers Group, Inc. 0.7% Unchanged 12,400 $1.06M
FH Firstcash Holdings, Inc. 0.7% Unchanged 4,950 $1.05M
Digi International, Inc. 0.7% Unchanged 13,700 $1.04M
Raymond James Financial, Inc. 0.7% Unchanged 6,450 $1.02M
Nova Ltd. 0.7% Trimmed 18% 2,640 $1.02M
Lifestance Health Group, Inc. 0.7% Unchanged 83,600 $1.01M
Twist Bioscience Corporation 0.7% Unchanged 5,100 $986K
Rbc Bearings, Inc. 0.7% Unchanged 1,970 $983K
Ringcentral, Inc. 0.7% Unchanged 13,050 $975K
Ftai Aviation Ltd. 0.6% Unchanged 5,800 $969K
Axos Financial, Inc. 0.6% Added 86% 11,150 $965K
Penumbra, Inc. 0.6% Unchanged 3,000 $955K
Unity Software, Inc. 0.6% Unchanged 22,550 $923K
Insmed, Inc. 0.6% Unchanged 7,925 $905K
Woodward, Inc. 0.6% Unchanged 2,750 $904K
Axsome Therapeutics, Inc. 0.6% Unchanged 4,850 $894K
Celestica, Inc. 0.6% Unchanged 2,450 $886K
Fortinet, Inc. 0.6% Unchanged 4,950 $885K
Monolithic Power Systems, Inc. 0.6% Unchanged 650 $876K
Lpl Financial Holdings, Inc. 0.6% Unchanged 2,850 $872K
Halozyme Therapeutics, Inc. 0.6% Unchanged 7,850 $867K
Ha Sustainable Infrastructure Capital, Inc. 0.6% Unchanged 23,550 $844K
Palo Alto Networks, Inc. 0.6% Unchanged 2,090 $830K
Customers Bancorp, Inc. 0.6% Added 131% 11,200 $829K
Installed Building Products, Inc. 0.6% Unchanged 4,300 $825K
Gold Fields Ltd. 0.5% Unchanged 22,750 $822K
Ionq, Inc. 0.5% Unchanged 18,700 $820K
Grail, Inc. 0.5% Unchanged 5,750 $806K
Axon Enterprise, Inc. 0.5% Unchanged 1,875 $792K
EG Ensign Group, Inc. (the) 0.5% Unchanged 4,600 $791K
CW Chefs' Warehouse, Inc. (the) 0.5% Unchanged 7,050 $791K
Modine Manufacturing Company 0.5% Unchanged 4,150 $777K
II Ishares Iboxx $ High Yield Corporate Bond ETF 0.5% Unchanged 10,000 $772K
Tg Therapeutics, Inc. 0.5% Unchanged 13,700 $764K
Curtiss-wright Corporation 0.5% Unchanged 1,400 $761K
Corcept Therapeutics, Inc. 0.5% Unchanged 6,500 $749K
Applied Digital Corporation 0.5% Unchanged 30,350 $740K
CG Casey's General Stores, Inc. 0.5% Unchanged 1,200 $730K

Showing top 60 of 252 positions.

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q3 2026

quarter ended September 30, 2026 · filed October 28, 2026

Company Action Shares changed Value of change % of portfolio
Ies Holdings, Inc. Added +5,510 +$1.77M 2.4%
Neptune Insurance Holdings, Inc. New +26,350 +$721K 0.5%
Brown & Brown, Inc. New +9,750 +$594K 0.4%
Construction Partners, Inc. Exited −4,800 −$570K —
IC Ishares Convertible Bond ETF Trimmed −5,000 −$565K 1.1%
Cognex Corporation New +8,400 +$509K 0.3%
Stonex Group, Inc. Added +7,875 +$509K 1.0%
Waystar Holding Corporation New +20,050 +$508K 0.3%
SB SPDR Bloomberg Convertible Securities ETF Trimmed −5,000 −$506K 1.0%
Ceco Environmental Corporation Added +7,100 +$494K 1.1%

Showing the 10 largest of 68 changes.

Q2 2026

quarter ended June 30, 2026 · filed July 23, 2026

Company Action Shares changed Value of change % of portfolio
Kla Corporation Added +8,010 +$2.42M 1.6%
Palo Alto Networks, Inc. Trimmed −6,821 −$2.33M 0.4%
Bloom Energy Corporation New +4,150 +$1.26M 0.8%
Semtech Corporation New +6,850 +$1.11M 0.7%
Liquidia Corporation New +12,700 +$1.01M 0.6%
Forgent Power Solutions, Inc. New +17,200 +$961K 0.6%
Lifestance Health Group, Inc. New +83,600 +$895K 0.5%
Denali Therapeutics, Inc. New +32,100 +$826K 0.5%
Beam Therapeutics, Inc. New +22,550 +$774K 0.5%
Life Time Group Holdings, Inc. New +16,450 +$672K 0.4%

Showing the 10 largest of 164 changes.

Q1 2026

quarter ended March 31, 2026 · filed April 20, 2026

Company Action Shares changed Value of change % of portfolio
Cyberark Software Ltd. Exited −4,050 −$1.81M —
Palo Alto Networks, Inc. New +8,911 +$1.43M 1.2%
Robinhood Markets, Inc. Exited −12,300 −$1.39M —
SG Sportradar Group A.g. Exited −42,100 −$1M —
Accelerant Holdings Exited −59,300 −$970K —
Lpl Financial Holdings, Inc. Trimmed −3,190 −$960K 0.5%
Lumentum Holdings, Inc. New +1,125 +$791K 0.7%
Ingersoll Rand, Inc. Exited −9,700 −$768K —
Figure Technology Solutions, Inc. Exited −17,300 −$707K —
Genius Sports Ltd. Exited −62,700 −$691K —

Showing the 10 largest of 110 changes.

Q4 2025

quarter ended December 31, 2025 · filed January 23, 2026

Company Action Shares changed Value of change % of portfolio
IC Ishares Convertible Bond ETF Trimmed −23,000 −$2.27M 2.1%
SB SPDR Bloomberg Convertible Securities ETF Trimmed −23,000 −$2.05M 1.9%
Semrush Holdings, Inc. Trimmed −87,500 −$1.04M 0.3%
DS Descartes Systems Group, Inc./the Exited −10,800 −$1.02M —
Accelerant Holdings New +59,300 +$970K 0.8%
II Ishares Iboxx $ Investment Grade Corporate Bond New +8,000 +$882K 0.7%
Zeta Global Holdings Corporation New +38,350 +$780K 0.6%
IP Ishares Preferred And Income Securities ETF Trimmed −25,000 −$774K 1.0%
Figure Technology Solutions, Inc. New +17,300 +$707K 0.6%
Lyft, Inc. New +33,200 +$643K 0.5%

Showing the 10 largest of 91 changes.

Q3 2025

quarter ended September 30, 2025 · filed October 29, 2025

Company Action Shares changed Value of change % of portfolio
IC Ishares Convertible Bond ETF New +50,000 +$5M 4.0%
SB SPDR Bloomberg Barclays Convertible Securities ETF New +50,000 +$4.53M 3.6%
IU Ishares Us Preferred Stock ETF New +65,000 +$2.06M 1.6%
VE Vanguard Emerging Markets Government Bond ETF New +25,000 +$1.67M 1.3%
Duolingo Inc Exited −1,975 −$810K —
AB Applied Blockchain, Inc. New +30,350 +$696K 0.6%
LI Logitech International S.a. Exited −7,500 −$676K —
II Ishares Iboxx $ High Yield Corporate Bond ETF New +8,000 +$650K 0.5%
Ramaco Resources, Inc. New +19,150 +$636K 0.5%
Reddit, Inc. New +2,650 +$609K 0.5%

Showing the 10 largest of 82 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 04, 2025

Company Action Shares changed Value of change % of portfolio
Tradeweb Markets, Inc. Exited −4,850 −$720K —
Sezzle Inc New +3,950 +$708K 0.7%
Ufp Industries, Inc. Exited −6,300 −$674K —
Payoneer Global, Inc. New +92,700 +$635K 0.6%
Blackline, Inc. New +10,400 +$589K 0.6%
Semrush Holdings Inc New +61,600 +$557K 0.5%
Masterbrand Inc. Exited −40,650 −$531K —
Matson, Inc. Exited −4,130 −$529K —
Interactive Brokers Group, Inc. Added +9,300 +$515K 0.7%
Osi Systems, Inc. New +2,270 +$510K 0.5%

Showing the 10 largest of 88 changes.

Q1 2025

quarter ended March 31, 2025 · filed April 23, 2025

Company Action Shares changed Value of change % of portfolio
Kirby Corp. Exited −6,950 −$735K —
Northern Oil And Gas, Inc. Exited −17,900 −$665K —
Permian Resources Corp. Exited −44,700 −$643K —
Eagle Materials, Inc. Trimmed −2,765 −$614K 0.4%
Tetra Tech, Inc. Exited −14,250 −$568K —
Sarepta Therapeutics, Inc. Exited −4,600 −$559K —
Rambus, Inc. Trimmed −10,800 −$559K 0.4%
Intapp Inc Exited −8,300 −$532K —
Arcos Dorados Holdings Inc. Exited −73,000 −$531K —
Aspen Aerogels, Inc. Exited −44,100 −$524K —

Showing the 10 largest of 80 changes.

Q4 2024

quarter ended December 31, 2024 · filed January 27, 2025

Company Action Shares changed Value of change % of portfolio
Arista Networks Inc New +9,800 +$1.08M 1.0%
Arista Networks, Inc. Exited −2,450 −$940K —
Super Micro Computer, Inc. Exited −1,995 −$831K —
Hawkins, Inc. New +5,150 +$632K 0.6%
Super Micro Computer, Inc. New +19,950 +$608K 0.6%
Sarepta Therapeutics, Inc. New +4,600 +$559K 0.5%
Interactive Brokers Group, Inc. New +3,100 +$548K 0.5%
Genius Sports Ltd. New +62,700 +$542K 0.5%
Dutch Bros Inc. New +10,300 +$540K 0.5%
Intapp Inc New +8,300 +$532K 0.5%

Showing the 10 largest of 69 changes.

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