Octahedron Capital Management L.P.

Hedge Fund • Long/Short

Octahedron Capital Management L.P. is a Long/Short Hedge Fund based in Burlingame, CA led by Ehab Monir Siam, reporting $358.8M in AUM as of Q3 2025 with 53% Technology concentration, 77% concentrated in top 10 holdings, 16% allocation to NU, and 53% technology allocation.

COOEhab Monir Siam

Portfolio Value: $175.9M
Positions: 23
Top Holding: NU at 15.71%
Last Reported: Q3 2025

Address700 Airport Blvd, Suite 450, Burlingame, CA, 94010, United States

Top Holdings

Largest long holdings in Octahedron Capital Management L.P.'s portfolio (76.8% of total portfolio)

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Holding	Sector	Position	Weight	Traded	Ownership	Owned Since
1 Nu Holdings NU	Banks - Diversified Financial Services	$27.6M	15.71%	+$1.9M Bought	0.04% 1.7M shares	Q4 2022 Held for 3 years
2 Uber Technologies UBER	Software - Application Technology	$16.8M	9.52%	+$6.0M Bought	0.01% 171.0K shares	Q4 2021 Held for 4 years
3 Alphabet Inc. GOOGL	Internet Content & Information Communication Services	$16.0M	9.08%	-$8.8M Sold	0.00% 65.7K shares	Q3 2023 Held for 2y 3m
4 Robinhood Markets, Inc. HOOD	Software - Infrastructure Technology	$16.0M	9.07%	-$14.3K Sold	0.01% 111.4K shares	Q4 2024 Held for 1 year
5 Nvidia NVDA	Semiconductors Technology	$12.3M	7.00%	+$3.4M Bought	0.00% 66.0K shares	Q3 2023 Held for 2y 3m
6 monday.com MNDY	Software - Application Technology	$12.0M	6.81%	+$9.7M Bought	0.12% 61.9K shares	Q1 2025 Held for 9 months
7 ASML ASML ASML	Unknown Unknown	$10.1M	5.72%	+$2.3M Bought	— 10.4K shares	Q1 2024 Held for 1y 9m
8 Taiwan Semiconductor Manufacturing Company TSM	Semiconductors Technology	$9.1M	5.16%	—	— 32.5K shares	Q1 2025 Held for 9 months
9 Carvana CVNA	Specialty Retail Consumer Cyclical	$8.1M	4.63%	+$3.8M Bought	0.02% 21.6K shares	Q4 2024 Held for 1 year
10 Amazon AMZN	Specialty Retail Consumer Cyclical	$7.3M	4.14%	-$3.6M Sold	0.00% 33.2K shares	Q4 2021 Held for 4 years

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Changes

Portfolio activity, position movements, and quarter-over-quarter changes in Octahedron Capital Management L.P.'s latest filing

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Market Value

$175.9M

Prior: $132.5M

Q/Q Change

+32.83%

+$43.5M

Net Flows % of MV

+10.72%

Turnover Ratio

22.89%

New Purchases

4 stocks

$12.0M

Added To

10 stocks

+$37.4M

Sold Out Of

4 stocks

$5.9M

Reduced Holdings

6 stocks

-$24.6M

Increased Positions

Position	Shares Δ	Change
1 Visa V	New	0 → 12.6K +$4.3M
2 ServiceNow NOW	New	0 → 4.3K +$3.9M
3 Onto Innovation ONTO	New	0 → 15.0K +$1.9M
4 Coherent COHR	New	0 → 17.0K +$1.8M
5 Rubrik RBRK	+764.0%	7.5K → 64.8K +$4.7M

Decreased Positions

Position	Shares Δ	Change
1 GitLab GTLB	Sold	81.9K → 0 −$3.7M
2 Lam Research LRCX	Sold	8.0K → 0 −$778.7K
3 Shopify SHOP	Sold	6.3K → 0 −$726.7K
4 Samsara IOT	Sold	17.0K → 0 −$676.3K
5 MongoDB MDB	-68.39%	50.2K → 15.9K −$10.6M