Sunstone Asset Management, LP In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 14, 2026), Sunstone Asset Management, LP reported 57 stock positions worth $92.4 million . Its top holding was Applied Materials (AMAT) at 5.9% of the portfolio, followed by MKS (MKSI, 5.6% ) and Macom Technology Solutions H (MTSI, 4.8% ). Compared with Q1 2026, it opened 27 new positions, sold out of 20, added to 10 and reduced 7. The biggest buy was a new position in MKS (MKSI) and the biggest sale an exit from Nvidia (NVDA).
Location New York, NY
CIK 0002111996
Portfolio Value $92.4M (Q2 2026) Holdings 57 stocks · $92.4M Holdings quarter Q2 2026 Q1 2026 Q4 2025
Stock % Of Portfolio ▼ Shares Held Total Value Change vs Q1 2026 AMAT Applied Materials Inc. 7,580 $5.5M Add +1.1% MKSI MKS Inc. 11,600 $5.2M New MTSI Macom Technology Solutions H 11,661 $4.4M Reduce -18.2% GLW Corning Inc. 17,052 $4.4M Add +12.4% DASH DoorDash Inc. Class A 22,900 $4.2M Add +45.9% BILL HOLDINGS INC (BILL 0 04/01/30) 4,660,000 $4.0M New SNPS Synopsys Inc. 8,150 $3.6M Add +9.7% ASML ASML Holding NV-NY Reg SHS filed as ASML HLDG NV 1,700 $3.4M New SNOW Snowflake Inc. 12,000 $3.1M Add +66.7% GSAT Globalstar Inc. 33,500 $2.7M New TDS Telephone and Data Systems 70,604 $2.6M No change APH Amphenol Corp. Class A 14,500 $2.6M No change SE Sea Ltd.-ADR 26,214 $2.5M Add +92.5% V Visa Inc. Class A 7,300 $2.5M No change AMZN Amazon.com Inc. 10,300 $2.5M New ADI Analog Devices Inc. 6,000 $2.4M Add +150.0% UNITY SOFTWARE INC (U 0 11/15/26) 2,000,000 $2.0M New ANET Arista Networks Inc. 10,400 $1.8M New EQIX Equinix Inc. 1,645 $1.7M Reduce -21.1% NTNX Nutanix Inc. Class A 32,890 $1.7M No change AMT American Tower Corp. 9,914 $1.6M No change ORCL Oracle Corp. 10,500 $1.5M Add +90.9% CIEN Ciena Corp. 3,040 $1.5M New STX Seagate Technology Holdings 1,480 $1.4M New SUPER MICRO COMPUTER INC (SMCI 3.5 03/01/29) 1,500,000 $1.4M New MONGODB INC 20,000 $1.4M New MRSH Marsh & McLennan Cos 7,932 $1.3M Reduce -39.6% JOYY Joyy Inc.-ADR 18,705 $1.2M No change TER Teradyne Inc. 2,320 $1.1M New NOW ServiceNow Inc. 11,230 $1.1M Add +39.9% KLAC KLA Corp. 3,540 $1.1M Reduce -63.1% TWLO Twilio Inc. Class A 5,166 $1.1M Reduce -55.3% TCOM Trip.com Group Ltd.-ADR 26,300 $1.0M Add +171.1% SONY Sony Group Corp. - SP ADR 49,626 $995K No change NET Cloudflare Inc. Class A 4,046 $994K New COHR Coherent Corp. 2,400 $947K New GLD SPDR Gold Shares 2,560 $943K No change TWILIO INC 15,000 $939K New CLOUDFLARE INC 13,800 $898K New SNOWFLAKE INC 10,000 $828K New SHOP Shopify Inc. Class A 7,190 $821K No change OLED Universal Display Corp. 9,217 $798K No change ABNB Airbnb Inc. Class A 5,000 $716K Reduce -70.1% SBAC SBA Communications Corp. 4,000 $706K New GWRE Guidewire Software Inc. 4,400 $541K New APPLOVIN CORP 5,000 $481K New ESTC Elastic NV 6,600 $376K No change ROBLOX CORP 40,000 $364K New S Sentinelone Inc. Class A 20,000 $339K No change RBLX Roblox Corp. Class A 5,900 $321K Reduce -59.9% FIVE9 INC (FIVN 1 03/15/29) 200,000 $178K New ETSY INC 12,500 $171K New ZIP Ziprecruiter Inc. Class A 38,810 $146K No change GUIDEWIRE SOFTWARE INC 20,000 $139K New META PLATFORMS INC 5,000 $138K New ORACLE CORP 20,000 $82K New NUTANIX INC 10,000 $40K New
Portfolio Sells Q1 2026 → Q2 2026 Portfolio Sells quarter Q2 2026 Q1 2026 Q4 2025
Stock Change vs Q1 2026 % Of Portfolio Change To Portfolio ▲ NVDA Nvidia Corp. Sold out 0.00% −6.99 MDB Mongodb Inc. Sold out 0.00% −5.16 PANW Palo Alto Networks Inc. Sold out 0.00% −3.61 AMD Advanced Micro Devices Sold out 0.00% −2.97 MSFT Microsoft Corp. Sold out 0.00% −2.88 FLEX Flex Ltd. Sold out 0.00% −2.61 SNDK Sandisk Corp. Sold out 0.00% −2.18 NFLX Netflix Inc. Sold out 0.00% −2.03 ABNB Airbnb Inc. Class A Reduce -70.1% 0.77% −2.00 GOOG Alphabet Inc. Class C Sold out 0.00% −1.76 NOK Nokia Corp.-Spon ADR Sold out 0.00% −1.74 INTU Intuit Inc. Sold out 0.00% −1.64 MRSH Marsh & McLennan Cos Reduce -39.6% 1.43% −1.57 TTMI TTM Technologies Sold out 0.00% −1.55 CLS Celestica Inc. Sold out 0.00% −1.48 RMBS Rambus Inc. Sold out 0.00% −1.33 U Unity Software Inc. Sold out 0.00% −1.24 AVGO Broadcom Inc. Sold out 0.00% −1.11 EQIX Equinix Inc. Reduce -21.1% 1.86% −0.83 TWLO Twilio Inc. Class A Reduce -55.3% 1.15% −0.76 RBLX Roblox Corp. Class A Reduce -59.9% 0.35% −0.75 ETSY Etsy Inc. Sold out 0.00% −0.72 KLAC KLA Corp. Reduce -63.1% 1.16% −0.70 ZS Zscaler Inc. Sold out 0.00% −0.69 ZM Zoom Communications Inc. Sold out 0.00% −0.44 EM Smart Share Global Ltd. - ADR Sold out 0.00% −0.07 MTSI Macom Technology Solutions H Reduce -18.2% 4.80% +0.63
Portfolio Buys Q1 2026 → Q2 2026 Portfolio Buys quarter Q2 2026 Q1 2026 Q4 2025
Stock Change vs Q1 2026 % Of Portfolio Change To Portfolio ▼ MKSI MKS Inc. New 5.59% +5.59 BILL HOLDINGS INC (BILL 0 04/01/30) New 4.37% +4.37 ASML ASML Holding NV-NY Reg SHS New 3.66% +3.66 GSAT Globalstar Inc. New 2.95% +2.95 AMZN Amazon.com Inc. New 2.66% +2.66 AMAT Applied Materials Inc. Add +1.1% 5.93% +2.56 UNITY SOFTWARE INC (U 0 11/15/26) New 2.13% +2.13 GLW Corning Inc. Add +12.4% 4.71% +2.00 ANET Arista Networks Inc. New 1.91% +1.91 SNOW Snowflake Inc. Add +66.7% 3.31% +1.88 CIEN Ciena Corp. New 1.61% +1.61 ADI Analog Devices Inc. Add +150.0% 2.58% +1.57 STX Seagate Technology Holdings New 1.55% +1.55 SUPER MICRO COMPUTER INC (SMCI 3.5 03/01/29) New 1.50% +1.50 MONGODB INC New 1.49% +1.49 DASH DoorDash Inc. Class A Add +45.9% 4.58% +1.47 SE Sea Ltd.-ADR Add +92.5% 2.72% +1.24 TER Teradyne Inc. New 1.22% +1.22 NET Cloudflare Inc. Class A New 1.08% +1.08 COHR Coherent Corp. New 1.02% +1.02 TWILIO INC New 1.02% +1.02 CLOUDFLARE INC New 0.97% +0.97 SNOWFLAKE INC New 0.90% +0.90 SBAC SBA Communications Corp. New 0.76% +0.76 ORCL Oracle Corp. Add +90.9% 1.67% +0.60 GWRE Guidewire Software Inc. New 0.59% +0.59 APPLOVIN CORP New 0.52% +0.52 TCOM Trip.com Group Ltd.-ADR Add +171.1% 1.13% +0.50 ROBLOX CORP New 0.39% +0.39 FIVE9 INC (FIVN 1 03/15/29) New 0.19% +0.19 ETSY INC New 0.18% +0.18 GUIDEWIRE SOFTWARE INC New 0.15% +0.15 META PLATFORMS INC New 0.15% +0.15 NOW ServiceNow Inc. Add +39.9% 1.21% +0.10 ORACLE CORP New 0.09% +0.09 SNPS Synopsys Inc. Add +9.7% 3.94% +0.06 NUTANIX INC New 0.04% +0.04
Options Activity Q1 2026 → Q2 2026 Security Type Change vs Q1 2026 Underlying Shares Value ▼ CORNING INC call Sold out 10,000 $159Kbefore exit ETSY INC call Sold out 12,500 $72Kbefore exit MAPLEBEAR INC call Sold out 60,000 $38Kbefore exit PALO ALTO NETWORKS INC call Sold out 10,000 $21Kbefore exit NUTANIX INC call Sold out 10,000 $19Kbefore exit
Calls and puts are listed by the shares they cover; their value is not part of the stock holdings above.
Notes & Other Activity Q1 2026 → Q2 2026 Security Class Change vs Q1 2026 Shares / Principal Value ▼ BILL HOLDINGS INC (BILL 0 04/01/30) NOTE 4/0 · principal Sold out 4,660,000 $4.2Mbefore exit UNITY SOFTWARE INC (U 0 11/15/26) NOTE 11/1 · principal Sold out 2,000,000 $1.9Mbefore exit ETSY INC (ETSY 0.125 10/01/26) NOTE 0.125%10/0 · principal Sold out 1,000,000 $978Kbefore exit SUPER MICRO COMPUTER INC (SMCI 2.25 07/15/28) NOTE 2.250% 7/1 · principal Sold out 1,000,000 $872Kbefore exit SUPER MICRO COMPUTER INC (SMCI 3.5 03/01/29) NOTE 3.500% 3/0 · principal Sold out 1,000,000 $800Kbefore exit FIVE9 INC (FIVN 1 03/15/29) NOTE 1.000% 3/1 · principal Sold out 200,000 $175Kbefore exit
Bonds, preferreds, convertibles and warrants; not part of the stock holdings or percentages above.
All Filings Quarter Positions 13F Reported Value Top Holdings Q2 2026 57 $92.4M AMAT, MKSI, MTSI, GLW, DASH Q1 2026 50 $75.9M NVDA, MDB, MTSI, TDS, SNPS Q4 2025 43 $61.9M CYBR, NVDA, DASH, TDS, V