Penbrook Management LLC

RIA/Wealth

Penbrook Management LLC is a RIA/Wealth based in New York, NY led by Robert Stephen Anderson, reporting $169.8M in AUM as of Q3 2025 with 51% concentrated in top 10 holdings.

Managing PartnerRobert Stephen Anderson

Portfolio Value: $143.0M
Positions: 102
Top Holding: NVO at 12.09%
Last Reported: Q3 2025

Address880 Third Avenue, 16th Floor, New York, NY, 10022, United States

Top Holdings

Largest long holdings in Penbrook Management LLC's portfolio (51.3% of total portfolio)

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GthenH

Holding	Sector	Position	Weight	Traded	Ownership	Owned Since
1 NVO Novo Nordisk NVO	Unknown Unknown	$17.3M	12.09%	+$11.1K Bought	— 311.6K shares	Q4 2022 Held for 2y 11m
2 Microsoft MSFT	Software - Infrastructure Technology	$12.6M	8.80%	-$349.6K Sold	0.00% 24.3K shares	Q4 2017 Held for 7y 11m
3 Amazon AMZN	Specialty Retail Consumer Cyclical	$11.4M	7.94%	+$84.5K Bought	0.00% 51.7K shares	Q4 2017 Held for 7y 11m
4 Moody's MCO	Financial - Data & Stock Exchanges Financial Services	$6.5M	4.55%	—	0.01% 13.7K shares	Q4 2017 Held for 7y 11m
5 Alphabet Inc. GOOGL	Internet Content & Information Communication Services	$5.6M	3.94%	—	0.00% 23.2K shares	Q4 2017 Held for 7y 11m
6 Alphabet Inc. GOOG	Internet Content & Information Communication Services	$5.5M	3.87%	-$487.1K Sold	0.00% 22.7K shares	Q4 2017 Held for 7y 11m
7 Planet Labs PL	Aerospace & Defense Industrials	$4.1M	2.85%	-$307.0K Sold	0.10% 314.2K shares	Q2 2023 Held for 2y 5m
8 Thomson Reuters TRI	Specialty Business Services Industrials	$3.9M	2.70%	—	0.01% 24.8K shares	Q4 2017 Held for 7y 11m
9 Aehr Test Systems AEHR	Semiconductors Technology	$3.5M	2.45%	-$301.1K Sold	0.39% 116.3K shares	Q4 2023 Held for 1y 11m
10 Alkami Technology, Inc. ALKT	Software - Application Technology	$3.1M	2.16%	+$2.1M Bought	0.12% 124.1K shares	Q3 2023 Held for 2y 2m

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GthenH

Changes

Portfolio activity, position movements, and quarter-over-quarter changes in Penbrook Management LLC's latest filing

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GthenC

Market Value

$143.0M

Prior: $139.7M

Q/Q Change

+2.38%

+$3.3M

Net Flows % of MV

-4.07%

Turnover Ratio

7.37%

New Purchases

5 stocks

$1.1M

Added To

19 stocks

+$5.8M

Sold Out Of

16 stocks

$9.4M

Reduced Holdings

29 stocks

-$3.3M

Increased Positions

Position	Shares Δ	Change
1 Global Payments GPN	New	0 → 5.1K +$425.0K
2 Iris Energy IREN	New	0 → 6.2K +$291.0K
3 One Stop Systems, Inc. OSS	New	0 → 47.4K +$254.1K
4 BTQ Morgan Stanley BTQ	New	0 → 14.8K +$102.1K
5 DEFT Defi Technologies, Inc. DEFT	New	0 → 10.8K +$22.8K

Decreased Positions

Position	Shares Δ	Change
1 Veren VRN	Sold	441.1K → 0 −$2.9M
2 Mr. Cooper Group Inc. COOP	Sold	15.8K → 0 −$1.9M
3 Navigator Holdings NVGS	Sold	50.4K → 0 −$713.2K
4 Nu Holdings NU	Sold	50.1K → 0 −$686.9K
5 iShares Biotechnology IBB	Sold	3.2K → 0 −$414.4K