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Penbrook Management LLC — 13F Holdings & Portfolio

CIK 1381055 · latest 13F-HR filed 2026-07-23

Backtest portfolio

Penbrook Management LLC manages $156.8M in 13F-reported U.S. long-equity assets across 101 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are NVO (9.67%), AMZN (7.87%), GOOGL (5.28%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 13 new positions, exited 5, added to 47, and trimmed 16.

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.

Filer Information
Address
880 THIRD AVENUE
16TH FLOOR
NEW YORK, NY 10022
Phone
(212) 792-6952
Filing Manager
Penbrook Management LLC
NEW YORK, NY
Signatory
Christopher DiCostanzo
Christopher DiCostanzo
Loading holdings…
AUM

$156.8M

Long-equity book

Holdings

101

Distinct positions

Period

2026-06-30

Filed 2026-07-23

Q/Q Activity

+13 / −5 / ↑47 / ↓16

vs 2026-03-31

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • NOVO-NORDISK A S ADR$3.5M +30.4%
  • MARVELL TECHNOLOGY INC$1.9M +200.7%
  • CRYOPORT INC COM PAR $0.001$1.6M +106.9%
  • ALPHABET INC CAP STK CL A$1.6M +24.3%
  • AMAZON COM INC$1.6M +14.4%
Show all 47 →

Top Trims

  • AEHR TEST SYS-$2.4M -83.1%
  • PHOTRONICS INC-$1.0M -25.9%
  • VERMILION ENERGY INC-$867.2K -31.9%
  • PLANET LABS PBC COM CL A-$248.5K -8.4%
  • VERIZON COMMUNICATIONS INC-$212.8K -14.2%
Show all 16 →

New Positions

  • SEABRIDGE GOLD INC$2.9M
  • ALLOT LTD SHS$2.4M
  • THOMSON REUTERS CORP$2.0M
  • BAYTEX ENERGY CORP$1.6M
  • ISHARES 20 YEAR TREASURY BOND ETF$476.2K
Show all 13 →

Exited Positions

  • SEABRIDGE GOLD INC COM$2.7M
  • THOMSON REUTERS CORP COM$2.2M
  • EXXON MOBIL CORP COM$217.2K
  • NIKE INC CL B$209.2K
  • EXAGEN INC COM$40.0K
Show all 5 →
All Holdings

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 $15.2M 9.67% 316,200 SH
2 AMAZON COM INC AMZN 023135106 $12.3M 7.87% 51,760 SH
3 ALPHABET INC CAP STK CL A GOOGL 02079K305 $8.3M 5.28% 23,170 SH
4 MICROSOFT CORP MSFT 594918104 $8.2M 5.22% 21,920 SH
5 ALPHABET INC CAP STK CL C GOOG 02079K107 $8.0M 5.08% 22,554 SH
6 MOODYS CORP MCO 615369105 $6.2M 3.93% 13,600 SH
7 ELECTROVAYA INC ELVA 28617B606 $3.4M 2.19% 326,231 SH
8 CRYOPORT INC COM PAR $0.001 CYRX 229050307 $3.2M 2.03% 202,675 SH
9 VIEMED HEALTHCARE INC VMD 92663R105 $3.2M 2.02% 277,178 SH
10 MARVELL TECHNOLOGY INC MRVL 573874104 $2.9M 1.85% 9,730 SH
11 PHOTRONICS INC PLAB 719405102 $2.9M 1.85% 89,055 SH
12 SEABRIDGE GOLD INC SA 811927102 $2.9M 1.82% 110,915 SH
13 EXTREME NETWORKS INC EXTR 30226D106 $2.7M 1.73% 84,025 SH
14 PLANET LABS PBC COM CL A PL 72703X106 $2.7M 1.73% 81,817 SH
15 PROTHENA CORP PLC SHS PRTA G72800108 $2.7M 1.70% 271,720 SH
16 ALKAMI TECHNOLOGY INC ALKT 01644J108 $2.5M 1.62% 140,585 SH
17 ALLOT LTD SHS ALLT M0854Q105 $2.4M 1.55% 275,295 SH
18 CISCO SYS INC CSCO 17275R102 $2.2M 1.37% 18,350 SH
19 BLACKSTONE INC BX 09260D107 $2.1M 1.36% 18,150 SH
20 MAGNITE INC MGNI 55955D100 $2.1M 1.36% 112,040 SH
21 AXCELIS TECHNOLOGIES INC ACLS 054540208 $2.1M 1.32% 10,895 SH
22 CURIOSITYSTREAM INC COM CL A CURI 23130Q107 $2.0M 1.30% 764,800 SH
23 THOMSON REUTERS CORP TRI 884903881 $2.0M 1.27% 24,381 SH
24 NUVEEN N Y MUN VALUE FD NNY 67062M105 $1.9M 1.19% 213,727 SH
25 VERMILION ENERGY INC VET 923725105 $1.9M 1.18% 197,825 SH
26 TARGA RES CORP TRGP 87612G101 $1.8M 1.18% 6,892 SH
27 BERKSHIRE HATHAWAY INC DEL CL B NEW BRK.B 084670702 $1.6M 1.05% 3,290 SH
28 BAYTEX ENERGY CORP BTE 07317Q105 $1.6M 1.02% 399,350 SH
29 ENERGY TRANSFER L P COM UT LTD PTN ET 29273V100 $1.4M 0.91% 74,489 SH
30 WILLIAMS COS INC WMB 969457100 $1.4M 0.91% 19,130 SH
31 AUTOMATIC DATA PROCESSING INC ADP 053015103 $1.4M 0.90% 6,300 SH
32 DATA I O CORP DAIO 237690102 $1.4M 0.89% 355,850 SH
33 SONY GROUP CORP SPONSORED ADR SONY 835699307 $1.4M 0.88% 68,500 SH
34 ABBVIE INC ABBV 00287Y109 $1.3M 0.83% 5,152 SH
35 VERIZON COMMUNICATIONS INC VZ 92343V104 $1.3M 0.82% 30,424 SH
36 AIRBNB INC COM CL A ABNB 009066101 $1.3M 0.82% 8,950 SH
37 STATE STREET SPDR S&P 500 ETF SPY 78462F103 $1.2M 0.76% 1,605 SH
38 MESOBLAST LTD SPONS ADR MESO 590717401 $1.2M 0.75% 87,075 SH
39 HESS MIDSTREAM LP CL A SHS HESM 428103105 $1.1M 0.72% 30,055 SH
40 BIOLIFE SOLUTIONS INC BLFS 09062W204 $1.1M 0.72% 39,705 SH
41 DOUBLEVERIFY HLDGS INC DV 25862V105 $1.1M 0.71% 102,660 SH
42 USA COMPRESSION PARTNERS LP COM UNIT LTDPAR USAC 90290N109 $1.1M 0.69% 41,038 SH
43 NPK INTERNATIONAL INC COM SHS NPKI 651718504 $1.1M 0.69% 67,825 SH
44 NVIDIA CORPORATION NVDA 67066G104 $1.1M 0.68% 5,323 SH
45 ONEOK INC OKE 682680103 $983.3K 0.63% 11,310 SH
46 META PLATFORMS INC CL A META 30303M102 $957.6K 0.61% 1,700 SH
47 KULICKE & SOFFA INDS INC KLIC 501242101 $949.7K 0.61% 7,100 SH
48 PAR TECHNOLOGY CORP PAR 698884103 $936.5K 0.60% 53,760 SH
49 POPULAR INC COM NEW BPOP 733174700 $870.2K 0.56% 5,300 SH
50 NOVARTIS AG SPONSORED ADR NVS 66987V109 $868.2K 0.55% 5,540 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-07-23 $156.8M 101 0001381055-26-000003
2026-03-31 2026-04-21 $132.1M 93 0001381055-26-000002
2025-12-31 2026-01-06 $145.0M 97 0001381055-26-000001