Sunstone Asset Management, LP — 13F Holdings & Portfolio
CIK 2111996 · latest 13F-HR filed 2026-08-14
Sunstone Asset Management, LP manages $92.4M in 13F-reported U.S. long-equity assets across 63 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are AMAT (5.93%), MKSI (5.59%), MTSI (4.80%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 23 new positions, exited 22, added to 19, and trimmed 10.
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.
15TH FLOOR, SUITE 1510
NEW YORK, NY 10022
$92.4M
Long-equity book
63
Distinct positions
2026-06-30
Filed 2026-08-14
+23 / −22 / ↑19 / ↓10
vs 2026-03-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- APPLIED MATLS INC$2.9M +113.8%
- CORNING INC$2.3M +111.0%
- SNOWFLAKE INC$2.0M +181.2%
- DOORDASH INC$1.9M +79.3%
- ANALOG DEVICES INC$1.6M +212.1%
Top Trims
- AIRBNB INC-$1.4M -66.1%
- MARSH & MCLENNAN COS INC-$955.7K -42.0%
- ROBLOX CORP-$512.1K -61.5%
- TWILIO INC-$389.3K -26.8%
- TELEPHONE & DATA SYS INC-$359.4K -12.1%
New Positions
- MKS INSTRUMENTS INC$5.2M
- ASML HOLDING N V$3.4M
- GLOBALSTAR INC$2.7M
- AMAZON COM INC$2.5M
- ARISTA NETWORKS INC$1.8M
Exited Positions
- NVIDIA CORPORATION$5.3M
- MONGODB INC$3.9M
- PALO ALTO NETWORKS INC$2.7M
- ADVANCED MICRO DEVICES INC$2.3M
- MICROSOFT CORP$2.2M
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 | APPLIED MATLS INC | AMAT | 038222105 | $5.5M | 5.93% | 7,580 | SH |
| 2 | MKS INSTRUMENTS INC | MKSI | 55306N104 | $5.2M | 5.59% | 11,600 | SH |
| 3 | MACOM TECH SOLUTIONS HLDGS I | MTSI | 55405Y100 | $4.4M | 4.80% | 11,661 | SH |
| 4 | CORNING INC | GLW | 219350105 | $4.4M | 4.71% | 17,052 | SH |
| 5 | DOORDASH INC | DASH | 25809K105 | $4.2M | 4.58% | 22,900 | SH |
| 6 | BILL HOLDINGS INC | BILL | 090043AF7 | $4.0M | 4.37% | 4,660,000 | SH |
| 7 | SYNOPSYS INC | SNPS | 871607107 | $3.6M | 3.94% | 8,150 | SH |
| 8 | ASML HOLDING N V | ASML | N07059210 | $3.4M | 3.66% | 1,700 | SH |
| 9 | SNOWFLAKE INC | SNOW | 833445109 | $3.1M | 3.31% | 12,000 | SH |
| 10 | GLOBALSTAR INC | GSAT | 378973507 | $2.7M | 2.95% | 33,500 | SH |
| 11 | TELEPHONE & DATA SYS INC | TDS | 879433829 | $2.6M | 2.83% | 70,604 | SH |
| 12 | AMPHENOL CORP | APH | 032095101 | $2.6M | 2.77% | 14,500 | SH |
| 13 | SEA LTD | SE | 81141R100 | $2.5M | 2.72% | 26,214 | SH |
| 14 | VISA INC | V | 92826C839 | $2.5M | 2.71% | 7,300 | SH |
| 15 | AMAZON COM INC | AMZN | 023135106 | $2.5M | 2.66% | 10,300 | SH |
| 16 | ANALOG DEVICES INC | ADI | 032654105 | $2.4M | 2.58% | 6,000 | SH |
| 17 | UNITY SOFTWARE INC | U | 91332UAB7 | $2.0M | 2.13% | 2,000,000 | SH |
| 18 | ARISTA NETWORKS INC | ANET | 040413205 | $1.8M | 1.91% | 10,400 | SH |
| 19 | EQUINIX INC | EQIX | 29444U700 | $1.7M | 1.86% | 1,645 | SH |
| 20 | NUTANIX INC | NTNX | 67059N108 | $1.7M | 1.81% | 32,890 | SH |
| 21 | AMERICAN TOWER CORP | AMT | 03027X100 | $1.6M | 1.76% | 9,914 | SH |
| 22 | ORACLE CORP | ORCL | 68389X105 | $1.5M | 1.67% | 10,500 | SH |
| 23 | CIENA CORP | CIEN | 171779309 | $1.5M | 1.61% | 3,040 | SH |
| 24 | SEAGATE TECHNOLOGY HLDNGS PL | STX | G7997R103 | $1.4M | 1.55% | 1,480 | SH |
| 25 | SUPER MICRO COMPUTER INC | SMCI | 86800UAB0 | $1.4M | 1.50% | 1,500,000 | SH |
| 26 | MONGODB INC | MDB | 60937P906 | $1.4M | 1.49% | 20,000 | SH |
| 27 | MARSH & MCLENNAN COS INC | MRSH | 571748102 | $1.3M | 1.43% | 7,932 | SH |
| 28 | JOYY INC | JOYY | 46591M109 | $1.2M | 1.34% | 18,705 | SH |
| 29 | TERADYNE INC | TER | 880770102 | $1.1M | 1.22% | 2,320 | SH |
| 30 | SERVICENOW INC | NOW | 81762P102 | $1.1M | 1.21% | 11,230 | SH |
| 31 | KLA CORP | KLAC | 482480100 | $1.1M | 1.16% | 3,540 | SH |
| 32 | TWILIO INC | TWLO | 90138F102 | $1.1M | 1.15% | 5,166 | SH |
| 33 | TRIP COM GROUP LTD | TCOM | 89677Q107 | $1.0M | 1.13% | 26,300 | SH |
| 34 | SONY GROUP CORP | SONY | 835699307 | $995.5K | 1.08% | 49,626 | SH |
| 35 | CLOUDFLARE INC | NET | 18915M107 | $993.5K | 1.08% | 4,046 | SH |
| 36 | COHERENT CORP | COHR | 19247G107 | $946.7K | 1.03% | 2,400 | SH |
| 37 | SPDR GOLD TR | GLD | 78463V107 | $943.1K | 1.02% | 2,560 | SH |
| 38 | TWILIO INC | TWLO | 90138F902 | $939.0K | 1.02% | 15,000 | SH |
| 39 | SNOWFLAKE INC | SNOW | 833445909 | $828.2K | 0.90% | 10,000 | SH |
| 40 | SHOPIFY INC | SHOP | 82509L107 | $821.0K | 0.89% | 7,190 | SH |
| 41 | UNIVERSAL DISPLAY CORP | OLED | 91347P105 | $798.1K | 0.86% | 9,217 | SH |
| 42 | AIRBNB INC | ABNB | 009066101 | $715.5K | 0.77% | 5,000 | SH |
| 43 | SBA COMMUNICATIONS CORP | SBAC | 78410G104 | $705.8K | 0.76% | 4,000 | SH |
| 44 | CLOUDFLARE INC | NET | 18915M907 | $623.5K | 0.68% | 8,800 | SH |
| 45 | GUIDEWIRE SOFTWARE INC | GWRE | 40171V100 | $541.4K | 0.59% | 4,400 | SH |
| 46 | APPLOVIN CORP | — | 03831W908 | $480.8K | 0.52% | 5,000 | SH |
| 47 | ELASTIC N V | ESTC | N14506104 | $376.3K | 0.41% | 6,600 | SH |
| 48 | SENTINELONE INC | S | 81730H109 | $339.4K | 0.37% | 20,000 | SH |
| 49 | ROBLOX CORP | RBLX | 771049103 | $321.0K | 0.35% | 5,900 | SH |
| 50 | CLOUDFLARE INC | NET | 18915M907 | $274.6K | 0.30% | 5,000 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $92.4M | 63 | 0000912282-26-001101 |
| 2026-03-31 | 2026-05-14 | $85.2M | 64 | 0000912282-26-000730 |
| 2025-12-31 | 2026-02-18 | $104.4M | 61 | 0000912282-26-000350 |