Penbrook Management LLC — 13F Holdings & Portfolio
CIK 1381055 · latest 13F-HR filed 2026-04-21
Penbrook Management LLC manages $132.1M in 13F-reported U.S. long-equity assets across 93 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are NVO (8.80%), AMZN (8.16%), MSFT (6.24%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 8 new positions, exited 12, added to 32, and trimmed 41.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$132.1M
Long-equity book
93
Distinct positions
2026-03-31
Filed 2026-04-21
+8 / −12 / ↑32 / ↓41
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- VERMILION ENERGY INC COM$1.1M +64.9%
- CRYOPORT INC COM PAR $0.001$1.0M +203.3%
- MAGNITE INC COM$827.8K +163.9%
- CURIOSITYSTREAM INC COM CL A$678.7K +51.4%
- AEHR TEST SYS COM$628.6K +27.1%
Top Trims
- NOVO-NORDISK A S ADR-$4.5M -27.8%
- PLANET LABS PBC COM CL A-$2.9M -49.2%
- MICROSOFT CORP COM-$2.8M -25.2%
- AMAZON COM INC COM-$1.2M -9.8%
- THOMSON REUTERS CORP COM-$1.1M -32.4%
New Positions
- PROTHENA CORP PLC SHS$2.6M
- EXTREME NETWORKS INC COM$1.3M
- CONOCOPHILLIPS COM$267.3K
- ANTERO MIDSTREAM CORP COM$225.7K
- EXXON MOBIL CORP COM$217.2K
Exited Positions
- SYNCHRONY FINANCIAL COM$1.3M
- COHU INC COM$891.2K
- GLOBAL PMTS INC$395.9K
- BARRETT BUSINESS SVCS INC COM$318.6K
- FIRST AMERN FINL CORP COM$264.2K
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | NOVO-NORDISK A S ADR | NVO | 670100205 | $11.6M | 8.80% | 316,200 | SH |
| 2 | AMAZON COM INC COM | AMZN | 023135106 | $10.8M | 8.16% | 51,760 | SH |
| 3 | MICROSOFT CORP COM | MSFT | 594918104 | $8.2M | 6.24% | 22,245 | SH |
| 4 | ALPHABET INC CAP STK CL A | GOOGL | 02079K305 | $6.7M | 5.05% | 23,170 | SH |
| 5 | ALPHABET INC CAP STK CL C | GOOG | 02079K107 | $6.5M | 4.90% | 22,554 | SH |
| 6 | MOODYS CORP COM | MCO | 615369105 | $5.9M | 4.49% | 13,600 | SH |
| 7 | PHOTRONICS INC COM | PLAB | 719405102 | $3.9M | 2.96% | 96,730 | SH |
| 8 | PLANET LABS PBC COM CL A | PL | 72703X106 | $3.0M | 2.24% | 105,870 | SH |
| 9 | AEHR TEST SYS COM | AEHR | 00760J108 | $2.9M | 2.23% | 79,515 | SH |
| 10 | SEABRIDGE GOLD INC COM | SA | 811916105 | $2.7M | 2.06% | 95,990 | SH |
| 11 | VERMILION ENERGY INC COM | VET | 923725105 | $2.7M | 2.06% | 197,825 | SH |
| 12 | PROTHENA CORP PLC SHS | PRTA | G72800108 | $2.6M | 2.00% | 271,720 | SH |
| 13 | VIEMED HEALTHCARE INC COM | VMD | 92663R105 | $2.5M | 1.90% | 272,398 | SH |
| 14 | ELECTROVAYA INC COM NEW | ELVA | 28617B606 | $2.3M | 1.74% | 295,356 | SH |
| 15 | THOMSON REUTERS CORP COM | TRI | 884903808 | $2.2M | 1.69% | 24,774 | SH |
| 16 | BLACKSTONE INC COM | BX | 09260D107 | $2.1M | 1.58% | 18,150 | SH |
| 17 | ALKAMI TECHNOLOGY INC COM | ALKT | 01644J108 | $2.0M | 1.52% | 127,685 | SH |
| 18 | CURIOSITYSTREAM INC COM CL A | CURI | 23130Q107 | $2.0M | 1.51% | 675,150 | SH |
| 19 | NUVEEN N Y MUN VALUE FD COM | NNY | 67062M105 | $1.8M | 1.35% | 213,727 | SH |
| 20 | TARGA RES CORP COM | TRGP | 87612G101 | $1.7M | 1.31% | 6,892 | SH |
| 21 | BERKSHIRE HATHAWAY INC DEL CL B NEW | BRK.B | 084670702 | $1.6M | 1.20% | 3,300 | SH |
| 22 | CRYOPORT INC COM PAR $0.001 | CYRX | 229050307 | $1.5M | 1.16% | 185,775 | SH |
| 23 | VERIZON COMMUNICATIONS INC COM | VZ | 92343V104 | $1.5M | 1.14% | 29,899 | SH |
| 24 | ENERGY TRANSFER L P COM UT LTD PTN | ET | 29273V100 | $1.4M | 1.09% | 74,489 | SH |
| 25 | CISCO SYS INC COM | CSCO | 17275R102 | $1.4M | 1.08% | 18,350 | SH |
| 26 | SONY GROUP CORP SPONSORED ADR | SONY | 835699307 | $1.4M | 1.07% | 68,500 | SH |
| 27 | WILLIAMS COS INC COM | WMB | 969457100 | $1.4M | 1.05% | 19,130 | SH |
| 28 | MESOBLAST LTD SPONS ADR | MESO | 590717401 | $1.3M | 1.01% | 87,075 | SH |
| 29 | MAGNITE INC COM | MGNI | 55955D100 | $1.3M | 1.01% | 112,190 | SH |
| 30 | AUTOMATIC DATA PROCESSING INC COM | ADP | 053015103 | $1.3M | 0.97% | 6,300 | SH |
| 31 | EXTREME NETWORKS INC COM | EXTR | 30226D106 | $1.3M | 0.95% | 83,525 | SH |
| 32 | HESS MIDSTREAM LP CL A SHS | HESM | 428103105 | $1.2M | 0.88% | 30,055 | SH |
| 33 | AIRBNB INC COM CL A | ABNB | 009066101 | $1.1M | 0.86% | 8,950 | SH |
| 34 | AXCELIS TECHNOLOGIES INC COM NEW | ACLS | 054540208 | $1.1M | 0.85% | 12,095 | SH |
| 35 | ABBVIE INC COM | ABBV | 00287Y109 | $1.1M | 0.85% | 5,170 | SH |
| 36 | USA COMPRESSION PARTNERS LP COM UNIT LTDPAR | USAC | 90290N109 | $1.1M | 0.84% | 41,038 | SH |
| 37 | STATE STREET SPDR S&P 500 ETF | SPY | 78462F103 | $1.0M | 0.79% | 1,605 | SH |
| 38 | ONEOK INC NEW COM | OKE | 682680103 | $1.0M | 0.77% | 11,310 | SH |
| 39 | DOUBLEVERIFY HLDGS INC COM | DV | 25862V105 | $977.6K | 0.74% | 102,910 | SH |
| 40 | NPK INTERNATIONAL INC COM SHS | NPKI | 651718504 | $974.5K | 0.74% | 67,250 | SH |
| 41 | META PLATFORMS INC CL A | META | 30303M102 | $972.6K | 0.74% | 1,700 | SH |
| 42 | MARVELL TECHNOLOGY INC COM | MRVL | 573874104 | $963.8K | 0.73% | 9,730 | SH |
| 43 | NVIDIA CORPORATION COM | NVDA | 67066G104 | $910.9K | 0.69% | 5,223 | SH |
| 44 | DATA I O CORP COM | DAIO | 237690102 | $902.8K | 0.68% | 356,850 | SH |
| 45 | SHELL PLC SPON ADS | SHEL | 780259305 | $874.2K | 0.66% | 9,400 | SH |
| 46 | NOVARTIS AG SPONSORED ADR | NVS | 66987V109 | $846.2K | 0.64% | 5,540 | SH |
| 47 | CENOVUS ENERGY INC COM | CVE | 15135U109 | $792.7K | 0.60% | 29,880 | SH |
| 48 | ASURE SOFTWARE INC COM | ASUR | 04649U102 | $770.9K | 0.58% | 89,635 | SH |
| 49 | ABRDN PHYSICAL GOLD SHARES ETF | SGOL | 00326A104 | $765.5K | 0.58% | 17,155 | SH |
| 50 | POPULAR INC COM NEW | BPOP | 733174700 | $737.9K | 0.56% | 5,500 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-04-21 | $132.1M | 93 | 0001381055-26-000002 |
| 2025-12-31 | 2026-01-06 | $145.0M | 97 | 0001381055-26-000001 |