Islander Capital Partners, L.P. — 13F Holdings & Portfolio
CIK 2081714 · latest 13F-HR filed 2026-08-14
Islander Capital Partners, L.P. manages $275.7M in 13F-reported U.S. long-equity assets across 13 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are SPOT (17.90%), AFRM (15.65%), SPHR (13.81%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 2 new positions and exited 4; 7 existing positions rose in reported value and 2 fell.
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.
Long-equity book
Distinct positions
Filed 2026-08-14
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 26Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.
Sector mix
% of 13F valueSectors from each company's SIC code; funds and ETFs grouped separately.
Biggest buys and sells
Q1 26 → Q2 26Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.
13F assets and positions
3 quartersTotal reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.
Top positions over time
reported valueThe eight largest current positions, valued at each quarter end.
Concentration
top 10 = 93.2%Cumulative share of the portfolio held in the largest N positions.
As of the firm’s regulatory filing dated Aug 10, 2026.
SAN FRANCISCO, CA 94108
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| ICP GP, LLC Control | GENERAL PARTNER since Sep 2022 | Less than 5% | Domestic Entity |
| Semenza, David, Roome Control | FOUNDER, MANAGING PARTNER, LIMITED PARTNER since Sep 2022 | 75% or more | Individual |
| THEDFORD, ELIZABETH, BONITA Control | CHIEF OPERATING OFFICER, CHIEF COMPLIANCE OFFICER since Jan 2023 | Less than 5% | Individual |
| Semenza, David, Roome Control Indirect owner via ICP GP, LLC | OWNER, MANAGER since Sep 2022 | 75% or more | Individual |
Ownership & leadership changes · 3 filings with changes since Jun 26, 2023
From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.
- ChangedSemenza, David, Roome · title FOUNDER, MANAGING PARTNER → FOUNDER, MANAGING PARTNER, LIMITED PARTNER
- ChangedSemenza, David, Roome · title PORTFOLIO MANAGER, CO-FOUNDER → FOUNDER, MANAGING PARTNER
- No longer listedMARTINEZ, JORDAN, ROBERT · CO-FOUNDER, PARTNER · 10–25% · control person · listed since Sep 2022
- ListedICP GP, LLC · GENERAL PARTNER · Less than 5% · control person
- ListedMARTINEZ, JORDAN, ROBERT · CO-FOUNDER, PARTNER · 10–25% · control person
- ListedSemenza, David, Roome · PORTFOLIO MANAGER, CO-FOUNDER · 75% or more · control person
- ListedSemenza, David, Roome · OWNER, MANAGER · 75% or more · indirect via ICP GP, LLC · control person
- ListedTHEDFORD, ELIZABETH, BONITA · CHIEF OPERATING OFFICER, CHIEF COMPLIANCE OFFICER · Less than 5% · control person
Quarter-over-quarter changes
Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.
Top Adds (vs prior quarter)
- AFFIRM HLDGS INC$17.0M +65.2%
- SHOPIFY INC$14.0M +60.1%
- SPHERE ENTERTAINMENT CO$12.2M +47.4%
- LIBERTY MEDIA CORP DEL$4.4M +86.5%
- TRANSDIGM GROUP INC$3.7M +23.4%
Exited Positions
- ROBLOX CORP$25.9M
- TKO GROUP HOLDINGS INC$10.1M
- UBER TECHNOLOGIES INC$5.5M
- TAKE-TWO INTERACTIVE SOFTWAR$5.2M
Islander Capital Partners, L.P. Holdings (2026-06-30)
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 | SPOTIFY TECHNOLOGY S A | SPOT | L8681T102 | $49.4M | 17.90% | 107,500 | SH |
| 2 | AFFIRM HLDGS INC | AFRM | 00827B106 | $43.1M | 15.65% | 529,097 | SH |
| 3 | SPHERE ENTERTAINMENT CO | SPHR | 55826T102 | $38.1M | 13.81% | 220,028 | SH |
| 4 | SHOPIFY INC | SHOP | 82509L107 | $37.2M | 13.50% | 326,000 | SH |
| 5 | KLAVIYO INC | KVYO | 49845K101 | $20.9M | 7.58% | 1,383,304 | SH |
| 6 | TRANSDIGM GROUP INC | TDG | 893641100 | $19.4M | 7.04% | 14,580 | SH |
| 7 | MADISON SQUARE GRDN SPRT COR | MSGS | 55825T103 | $17.7M | 6.43% | 44,122 | SH |
| 8 | NETFLIX INC. | NFLX | 64110L106 | $13.3M | 4.81% | 185,828 | SH |
| 9 | LIBERTY MEDIA CORP DEL | FWONK | 531229755 | $9.5M | 3.45% | 100,000 | SH |
| 10 | DOORDASH INC | DASH | 25809K105 | $8.3M | 3.01% | 45,000 | SH |
| 11 | AMAZON COM INC | AMZN | 023135106 | $7.6M | 2.77% | 32,000 | SH |
| 12 | RIVIAN AUTOMOTIVE INC | RIVN | 76954A103 | $6.3M | 2.29% | 363,733 | SH |
| 13 | MADISON SQUARE GARDEN ENTMT | MSGE | 558256103 | $4.9M | 1.76% | 60,000 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $275.7M | 13 | 0002081714-26-000006 |
| 2026-03-31 | 2026-05-15 | $307.9M | 17 | 0002081714-26-000005 |
| 2025-12-31 | 2026-02-13 | $221.9M | 14 | 0002081714-26-000002 |
SAN FRANCISCO, CA 94108