CIK: 0001381055
Total reported value
$132.1M
Reporting period: 2026-03-31 · Number of holdings: 93
Penbrook Management LLC disclosed 93 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $132.1M and a quarterly turnover rate of 29.2%.
Browse other institutions with $100M to $1B AUMBrowse other institutions starting with "P"
Penbrook Management LLC's disclosed holdings carry a Herfindahl concentration index of 0.033 — mathematically equivalent to about 30 equally-sized positions, well below its 93 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 1.45), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 47% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Trim NVO
-0.1% -$4.5M
Trim PL
-64.1% -$2.9M
Trim MSFT
-2.2% -$2.8M
Add VET
0.0% $1.1M
Add CYRX
+251.6% $1.0M
Add MGNI
+260.6% $827.8K
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | NVO | Novo-nordisk A/s-spons Adr | Stock-Healthcare | 8.80% | -2.30% | -0.06% | |
| 2 | AMZN | Amazon.com INC | Stock-Consumer Disc | 8.16% | -0.08% | — | |
| 3 | MSFT | Microsoft CORP | Stock-Tech | 6.24% | -1.35% | -2.22% | |
| 4 | GOOGL | Alphabet Inc-cl A | Stock-Comm Services | 5.05% | +0.05% | — | |
| 5 | GOOG | Alphabet Inc-cl C | Stock-Comm Services | 4.90% | +0.02% | — | |
| 6 | MCO | Moody's CORP | Stock-Financials | 4.49% | -0.30% | — | |
| 7 | PLAB | Photronics INC | Stock-Other | 2.96% | +0.52% | -12.60% | |
| 8 | PL | Planet Labs Pbc | Stock-Industrials | 2.24% | -1.78% | -64.14% | |
| 9 | AEHR | Aehr Test Systems | Stock-Other | 2.23% | +0.63% | -30.80% | |
| 10 | SEA1EUR | Seabridge Gold INC | Stock-Other | 2.06% | — | — | |
| 11 | VET | Vermilion Energy INC | Stock-Other | 2.06% | +0.92% | — | |
| 12 | PRTA | Prothena Corporation plc | Stock-Other | 2.00% | +2.00% | NEW | |
| 13 | VMD | Viemed Healthcare INC | Stock-Other | 1.90% | +0.51% | +0.31% | |
| 14 | ELVA | Electrovaya INC | Stock-Other | 1.74% | -0.17% | -15.58% | |
| 15 | TRI4EUR | Thomson Reuters CORP | Stock-Other | 1.69% | -0.58% | -0.70% | |
| 16 | BX | Blackstone INC | Stock-Financials | 1.58% | +0.01% | +22.64% | |
| 17 | ALKT | Alkami Technology INC | Stock-Other | 1.52% | -0.51% | — | |
| 18 | CURI | Curiositystream INC | Stock-Other | 1.51% | +0.60% | +94.40% | |
| 19 | NNY | Nuveen New York Muni Val | Stock-Other | 1.35% | — | — | |
| 20 | TRGP | Targa Resources CORP | Stock-Energy | 1.31% | +0.42% | -1.94% | |
| 21 | BRK-B | Berkshire Hathaway Inc-cl B | Stock-Other | 1.20% | — | -1.49% | |
| 22 | CYRX | Cryoport INC | Stock-Other | 1.16% | +0.81% | +251.61% | |
| 23 | VZ | Verizon Communications INC | Stock-Comm Services | 1.14% | +0.27% | -3.97% | |
| 24 | ET | Energy Transfer LP | Stock-Energy | 1.09% | +0.24% | — | |
| 25 | CSCO | Cisco Systems INC | Stock-Tech | 1.08% | — | — | |
| 26 | SONY | Sony Group CORP - Sp Adr | Stock-Tech | 1.07% | -0.14% | — | |
| 27 | WMB | Williams Cos INC | Stock-Energy | 1.05% | +0.26% | — | |
| 28 | MESO | Mesoblast Ltd- Spon Adr | Stock-Other | 1.01% | -0.08% | -0.57% | |
| 29 | MGNI | Magnite INC | Stock-Other | 1.01% | +0.66% | +260.57% | |
| 30 | ADP | Automatic Data Processing | Stock-Tech | 0.97% | -0.15% | — | |
| 31 | EXTR | Extreme Networks INC | Stock-Other | 0.95% | +0.95% | NEW | |
| 32 | HESM | Hess Midstream LP - Class A | Stock-Other | 0.88% | — | — | |
| 33 | ABNB | Airbnb Inc-class A | Stock-Consumer Disc | 0.86% | — | — | |
| 34 | ACLS | Axcelis Technologies INC | Stock-Tech | 0.85% | — | -23.91% | |
| 35 | ABBV | Abbvie INC | Stock-Healthcare | 0.85% | — | -1.15% | |
| 36 | USAC | USA Compression Partners LP | Stock-Other | 0.84% | — | — | |
| 37 | SPY | Ss Spdr S&p 500 ETF Trust-us | ETF-Large Cap & Growth | 0.79% | — | -6.69% | |
| 38 | OKE | Oneok INC | Stock-Energy | 0.77% | +0.20% | — | |
| 39 | DV | Doubleverify Holdings INC | Stock-Other | 0.74% | -0.07% | — | |
| 40 | NPKI | Npk International INC | Stock-Other | 0.74% | — | — | |
| 41 | META | Meta Platforms Inc-class A | Stock-Comm Services | 0.74% | — | — | |
| 42 | MRVL | Marvell Technology INC | Stock-Tech | 0.73% | — | — | |
| 43 | NVDA | Nvidia CORP | Stock-Tech | 0.69% | — | — | |
| 44 | DAIO | Data I/o CORP | Stock-Other | 0.68% | -0.10% | — | |
| 45 | SHEL | Shell Plc-adr | Stock-Energy | 0.66% | — | — | |
| 46 | NVS | Novartis Ag-sponsored Adr | Stock-Healthcare | 0.64% | — | -1.25% | |
| 47 | CVE | Cenovus Energy INC | Stock-Energy | 0.60% | +0.25% | — | |
| 48 | ASUR | Asure Software INC | Stock-Other | 0.58% | — | +0.45% | |
| 49 | SGOL | Abrdn Physical Gold Shares | ETF-Commodities | 0.58% | — | — | |
| 50 | BPOP | Popular INC | Stock-Financials | 0.56% | -0.46% | -53.59% |
Performance for Q3 2026
+3.8%
Performance Last 4 Quarters
+44.5%
Based on 69% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 93 | $132.1M | 29 | |
| 2025-12-31 | 97 | $145.0M | 16 | |
| 2025-09-30 | 104 | $143.2M | 37 | |
| 2025-06-30 | 102 | $133.0M | 0 | |
| 2025-03-31 | 107 | $132.3M | 100 | |
| 2024-12-31 | 110 | $146.6M | 0 | |
| 2024-09-30 | 106 | $153.8M | 0 | |
| 2024-06-30 | 101 | $163.8M | 0 | |
| 2024-03-31 | 102 | $161.3M | 0 | |
| 2023-12-31 | 103 | $148.8M | 0 | |
| 2023-09-30 | 100 | $136.5M | 0 | |
| 2023-06-30 | 100 | $138.0M | 0 | |
| 2023-03-31 | 95 | $130.5M | 0 | |
| 2022-12-31 | 95 | $117.3M | 0 | |
| 2022-09-30 | 99 | $116.2M | 0 | |
| 2022-06-30 | 106 | $126.8M | 0 | |
| 2022-03-31 | 109 | $154.1M | 0 | |
| 2021-12-31 | 102 | $166.0M | 0 | |
| 2021-09-30 | 102 | $160.9M | 0 | |
| 2021-06-30 | 104 | $166.8M | 91 | |
| 2021-03-31 | 102 | $139.0M | 30 | |
| 2020-12-31 | 97 | $129.8M | 0 | |
| 2020-09-30 | 101 | $115.4M | 20 | |
| 2020-06-30 | 131 | $101.7M | 31 | |
| 2020-03-31 | 130 | $78.1M | 32 | |
| 2019-12-31 | 131 | $102.6M | 20 | |
| 2019-09-30 | 126 | $92.2M | 15 | |
| 2019-06-30 | 127 | $93.2M | 25 | |
| 2019-03-31 | 131 | $96.2M | 21 | |
| 2018-12-31 | 128 | $87.6M | 27 | |
| 2018-09-30 | 129 | $104.4M | 22 | |
| 2018-06-30 | 127 | $104.0M | 18 | |
| 2018-03-31 | 124 | $100.0M | 20 | |
| 2017-12-31 | 124 | $111.1M | 50 | |
| 2016-09-30 | 130 | $92.8M | 22 | |
| 2016-06-30 | 132 | $90.7M | 22 | |
| 2016-03-31 | 132 | $90.8M | 23 | |
| 2015-12-31 | 144 | $97.5M | 26 | |
| 2015-09-30 | 144 | $94.4M | 36 | |
| 2015-06-30 | 136 | $105.3M | 21 | |
| 2015-03-31 | 146 | $112.6M | 27 | |
| 2014-12-31 | 146 | $110.9M | 19 | |
| 2014-09-30 | 154 | $108.5M | 21 | |
| 2014-06-30 | 150 | $113.2M | 30 | |
| 2014-03-31 | 136 | $105.8M | 26 | |
| 2013-12-31 | 140 | $103.1M | 0 |
Penbrook Management LLC's most significant position changes for 2026-03-31: New buy: Prothena Corporation plc (PRTA); Sold out: Synchrony Financial (SYF); New buy: Extreme Networks INC (EXTR); Sold out: Cohu INC (COHU); Sold out: Global Payments INC (GPN).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | VET | Vermilion Energy INC | +0.9% | — | Unchanged |
| 2 | CYRX | Cryoport INC | +0.8% | +251.61% | Add |
| 3 | MGNI | Magnite INC | +0.7% | +260.57% | Add |
| 4 | AEHR | Aehr Test Systems | +0.6% | -30.80% | Trim |
| 5 | CURI | Curiositystream INC | +0.6% | +94.40% | Add |
| 6 | PLAB | Photronics INC | +0.5% | -12.60% | Trim |
| 7 | VMD | Viemed Healthcare INC | +0.5% | +0.31% | Add |
| 8 | TRGP | Targa Resources CORP | +0.4% | -1.94% | Trim |
| 9 | VZ | Verizon Communications INC | +0.3% | -3.97% | Trim |
| 10 | WMB | Williams Cos INC | +0.3% | — | Unchanged |
| 11 | CVE | Cenovus Energy INC | +0.3% | — | Unchanged |
| 12 | ET | Energy Transfer LP | +0.2% | — | Unchanged |
| 13 | OKE | Oneok INC | +0.2% | — | Unchanged |
| 14 | GOOGL | Alphabet Inc-cl A | +0.1% | — | Unchanged |
| 15 | GOOG | Alphabet Inc-cl C | 0% | — | Unchanged |
| 16 | BX | Blackstone INC | 0% | +22.64% | Add |
| 17 | DV | Doubleverify Holdings INC | -0.1% | — | Unchanged |
| 18 | AMZN | Amazon.com INC | -0.1% | — | Unchanged |
| 19 | MESO | Mesoblast Ltd- Spon Adr | -0.1% | -0.57% | Trim |
| 20 | DAIO | Data I/o CORP | -0.1% | — | Unchanged |
| 21 | SONY | Sony Group CORP - Sp Adr | -0.1% | — | Unchanged |
| 22 | PAR | Par Technology Corp/del | -0.1% | +80.55% | Add |
| 23 | ADP | Automatic Data Processing | -0.2% | — | Unchanged |
| 24 | ELVA | Electrovaya INC | -0.2% | -15.58% | Trim |
| 25 | FBP | First Bancorp Puerto Rico | -0.3% | -47.66% | Trim |
| 26 | MCO | Moody's CORP | -0.3% | — | Unchanged |
| 27 | QQQ | Invesco Qqq Trust Series 1 | -0.4% | -50.53% | Trim |
| 28 | FNF | Fidelity National Financial | -0.5% | -54.88% | Trim |
| 29 | BPOP | Popular INC | -0.5% | -53.59% | Trim |
| 30 | ALKT | Alkami Technology INC | -0.5% | — | Unchanged |
| 31 | TRI4EUR | Thomson Reuters CORP | -0.6% | -0.70% | Trim |
| 32 | MSFT | Microsoft CORP | -1.4% | -2.22% | Trim |
| 33 | PL | Planet Labs Pbc | -1.8% | -64.14% | Trim |
| 34 | NVO | Novo-nordisk A/s-spons Adr | -2.3% | -0.06% | Trim |
| 35 | PRTA | Prothena Corporation plc | — | NEW | New buy |
| 36 | SYF | Synchrony Financial | — | EXIT | Sold out |
| 37 | EXTR | Extreme Networks INC | — | NEW | New buy |
| 38 | COHU | Cohu INC | — | EXIT | Sold out |
| 39 | GPN | Global Payments INC | — | EXIT | Sold out |
| 40 | BBSI | Barrett Business Svcs INC | — | EXIT | Sold out |
| 41 | COP | Conocophillips | — | NEW | New buy |
| 42 | FAF | First American Financial | — | EXIT | Sold out |
| 43 | WBS | Webster Financial CORP | — | EXIT | Sold out |
| 44 | AM | Antero Midstream CORP | — | NEW | New buy |
| 45 | XOM | Exxon Mobil CORP | — | NEW | New buy |
| 46 | AFL | Aflac INC | — | EXIT | Sold out |
| 47 | FIS | Fidelity National Info Serv | — | EXIT | Sold out |
| 48 | JPM | Jpmorgan Chase & Co | — | EXIT | Sold out |
| 49 | MRK | Merck & Co. INC. | — | NEW | New buy |
| 50 | TFPM | Triple Flag Precious Met | — | EXIT | Sold out |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-04-21 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-01-06 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-10-22 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-07-28 | Amendment | View on EDGAR |
| 2025-06-30 | 2025-07-25 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-04-01 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-01-23 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-10-15 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-07-24 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-04-18 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-01-16 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-10-10 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-07-17 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-04-20 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-01-24 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-10-31 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-07-29 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-04-26 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-01-10 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-10-26 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-07-27 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-06 | Amendment | View on EDGAR |
| 2021-03-31 | 2021-05-05 | Amendment | View on EDGAR |
| 2021-03-31 | 2021-04-16 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2022-04-25 | Amendment | View on EDGAR |
| 2020-12-31 | 2021-01-27 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-10-23 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-07-28 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-04-14 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-01-16 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-10-11 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-07-15 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-04-24 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-01 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-10-23 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-07-30 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-04-27 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-21 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-10-27 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-08-05 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-04-21 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-01-29 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-11-12 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-08-04 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-04-27 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-01-28 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-10-16 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-08-04 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-05-07 | Amendment | View on EDGAR |
| 2014-03-31 | 2014-05-02 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-03-25 | 13F-HR | View on EDGAR |
Institutions with a similar AUM
CIK 0002111816
Total reported value
$132.1M
21 stks
2026-03-31
AUM within 0.0% of this institution
CIK 0001922884
Total reported value
$132.0M
80 stks
2026-03-31
AUM within 0.0% of this institution
CIK 0002111920
Total reported value
$132.0M
33 stks
2026-06-30
AUM within 0.0% of this institution
Institutions with overlapping top holdings
CIK 0001102598
Total reported value
$130.8B
13,055 stks
2021-03-31
Stale — no recent filing
4 of the top 5 holdings overlap, including Microsoft CORP
CIK 0001325091
Total reported value
$23.5B
2,204 stks
2021-09-30
Stale — no recent filing
4 of the top 5 holdings overlap, including Amazon.com INC
CIK 0001506071
Total reported value
$666.2M
326 stks
2026-03-31
4 of the top 5 holdings overlap, including Microsoft CORP