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Portman Square Capital LLP — 13F Holdings & Portfolio

CIK 1966898 · latest 13F-HR filed 2026-10-15

Backtest portfolio

Portman Square Capital LLP manages $1.77B in 13F-reported U.S. long-equity assets across 87 reported positions as of its 2026-09-30 13F-HR filing. Its largest disclosed positions are IREN (11.05%), BABA (9.54%), SMTC (7.64%). Quarter over quarter (versus its 2026-06-30 filing) the fund opened 10 new positions and exited 11; 10 existing positions rose in reported value and 18 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.

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AUM
$1.77B

Long-equity book

Holdings
87

Distinct positions

Period
2026-09-30

Filed 2026-10-15

Q/Q Activity
+10 / −11 / ↑10 / ↓18

vs 2026-06-30

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q3 26
W16.7% · +82%BABA16.1% · -2%RDDT14.9% · +52%NET5.8% · newEVRG4.4% · 0%STX4.2% · -16%FE3.7% · -32%MP3.1% · newSOFI2.7% · newPCGPX2.6% · 0%MCHPP2.6% · -61%ON2.4% · +303%RIVN2.2% · newAKAM1.5% · -63%ALNY1.5% · +14%TLT1.5% · newBAPA1.3% · newALB1.3% · +145%FLR1.2% · newSO1.2% · +8%TTEK1.2% · +45%GLD1.2% · -48%GOOGN1.1% · newNOVTU0.9% · -67%NEEPV0.6% · -84%NEE0.6% · -89%PPLC0.6% · -92%KWEB0.5% · -43%XLP0.5% · newALBPA0.4% · -92%ARESPB0.3% · -71%UPST0.2% · +138%FXI0.2% · 0%AEIS0.2% · +156%ITRI0.2% · newHPE0.1% · +30%PPL0.1% · -83%LCID0.0% · -93%

Box 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 value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q2 26 → Q3 26

Estimated 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

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 74.3%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated May 14, 2026.

Assets Under Management
$4.58B
Discretionary
$4.58B
Employees
27
Accounts
4
Address
10 PORTMAN SQUARE
LONDON W1H 6AZ
United Kingdom
Phone
44 203 627 6800
Website
Name Title / Status Ownership Type
ATTAL, JULIEN, CHARLES ControlPARTNER
since Apr 2023
Less than 5%Individual
GABRIEL, ALEXANDER, JOHN ControlPARTNER
since Jul 2023
Less than 5%Individual
HEATON-ARMSTRONG, ALISTAIR, MARK ControlPARTNER
since Apr 2023
Less than 5%Individual
KHAN, YUSAF, AMIN ControlPARTNER / MEMBER
since Sep 2021
10–25%Individual
LINGARD, TOBY, NICHOLAS ALEXANDER ControlCOO / PARTNER / MEMBER
since Jul 2021
Less than 5%Individual
LUSSAULT, BASTIEN, (NMN) ControlPARTNER
since Apr 2023
Less than 5%Individual
SHARMA, SUTESH, KUMAR ControlCEO / PARTNER / MEMBER
since Jul 2021
50–75%Individual
TOSELAND, PETROS, ELIAS ControlCHIEF COMPLIANCE OFFICER / GENERAL COUNSEL
since Apr 2023
Less than 5%Individual
Ownership & leadership changes · 7 filings with changes since Mar 23, 2022

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.

May 14, 2026 filing
  • No longer listedDAS, LALIT, KISHORE · PARTNER / MEMBER · 10–25% · control person · listed since Sep 2021
  • No longer listedESPOSITO, VINCENZO, ALESSANDRO · PARTNER / MEMBER · Less than 5% · control person · listed since Jan 2022
Jan 3, 2025 filing
  • No longer listedTOIETTA, LUCA, (NMN) · PARTNER · Less than 5% · control person · listed since Apr 2023
Jun 21, 2024 filing
  • ChangedTOSELAND, PETROS, ELIAS · title CHIEF COMPLIANCE OFFICER → CHIEF COMPLIANCE OFFICER / GENERAL COUNSEL
Jul 10, 2023 filing
  • AddedGABRIEL, ALEXANDER, JOHN · PARTNER · Less than 5% · control person
Jun 28, 2023 filing
  • AddedATTAL, JULIEN, CHARLES · PARTNER · Less than 5% · control person
  • AddedHEATON-ARMSTRONG, ALISTAIR, MARK · PARTNER · Less than 5% · control person
  • AddedLUSSAULT, BASTIEN, (NMN) · PARTNER · Less than 5% · control person
  • AddedTOIETTA, LUCA, (NMN) · PARTNER · Less than 5% · control person
Apr 11, 2023 filing
  • AddedTOSELAND, PETROS, ELIAS · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
  • ChangedLINGARD, TOBY, NICHOLAS ALEXANDER · title COO / CCO / PARTNER / MEMBER → COO / PARTNER / MEMBER
Sep 8, 2022 filing
  • ChangedDAS, LALIT, KISHORE · title PARTNER → PARTNER / MEMBER
  • ChangedESPOSITO, VINCENZO, ALESSANDRO · title PARTNER → PARTNER / MEMBER
  • ChangedKHAN, YUSAF, AMIN · title PARTNER → PARTNER / MEMBER
  • ChangedLINGARD, TOBY, NICHOLAS ALEXANDER · title COO, CCO → COO / CCO / PARTNER / MEMBER
  • ChangedSHARMA, SUTESH, KUMAR · title CEO → CEO / PARTNER / MEMBER
Mar 23, 2022 filing (earliest on record)
  • ListedDAS, LALIT, KISHORE · PARTNER · 10–25% · control person
  • ListedESPOSITO, VINCENZO, ALESSANDRO · PARTNER · Less than 5% · control person
  • ListedKHAN, YUSAF, AMIN · PARTNER · 10–25% · control person
  • ListedLINGARD, TOBY, NICHOLAS ALEXANDER · COO, CCO · Less than 5% · control person
  • ListedSHARMA, SUTESH, KUMAR · CEO · 50–75% · 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)

Show all 10 →

Top Trims

Show all 18 →

New Positions

Show all 10 →

Exited Positions

Show all 11 →

Portman Square Capital LLP Holdings (2026-09-30)

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 IREN LIMITED Put IREN Q4982L109 $195.1M 11.05% 4,772,000 SH
2 ALIBABA GROUP HLDG LTD Put BABA 01609W102 $168.4M 9.54% 1,566,200 SH
3 SEMTECH CORP Put SMTC 816850101 $134.9M 7.64% 756,400 SH
4 WAYFAIR INC Put W 94419L101 $101.4M 5.74% 988,400 SH
5 REDDIT INC Put RDDT 75734B100 $88.2M 5.00% 619,300 SH
6 WAYFAIR INC W 94419L101 $76.5M 4.33% 745,851 SH
7 ALIBABA GROUP HLDG LTD BABA 01609W102 $73.5M 4.16% 683,622 SH
8 REDDIT INC RDDT 75734B100 $68.2M 3.86% 478,773 SH
9 SPDR GOLD TR Call GLD 78463V107 $45.7M 2.59% 120,000 SH
10 AKAMAI TECHNOLOGIES INC Put AKAM 00971T101 $40.5M 2.29% 380,600 SH
11 CLOUDFLARE INC Put NET 18915M107 $39.3M 2.22% 113,100 SH
12 ALBEMARLE CORP Put ALB 012653101 $38.9M 2.20% 367,800 SH
13 LIVE NATION ENTERTAINMENT IN Put LYV 538034109 $36.1M 2.04% 213,000 SH
14 CLOUDFLARE INC NET 18915M107 $26.4M 1.49% 75,939 SH
15 MICROCHIP TECHNOLOGY INC. Put MCHP 595017104 $24.6M 1.39% 316,500 SH
16 PG&E CORP Put PCG 69331C108 $23.4M 1.33% 1,913,000 SH
17 BOEING CO Put BA 097023105 $23.3M 1.32% 125,200 SH
18 ON SEMICONDUCTOR CORP Put ON 682189105 $22.9M 1.30% 298,500 SH
19 GLOBAL PMTS INC Put GPN 37940X102 $22.1M 1.25% 270,000 SH
20 EVERGY INC EVRG 30034WAD8 $20.3M 1.15% 15,800,000 PRN
21 SEAGATE TECHNOLOGY HLDNGS PL STX G7997R103 $19.4M 1.10% 21,086 SH
22 ALPHABET INC Put GOOG 02079K107 $19.4M 1.10% 57,000 SH
23 TETRA TECH INC NEW Put TTEK 88162G103 $19.2M 1.09% 582,700 SH
24 FIRSTENERGY CORP Put FE 337932107 $17.6M 1.00% 407,100 SH
25 FIRSTENERGY CORP FE 337932AV9 $17.2M 0.97% 16,600,000 PRN
26 GUARDANT HEALTH INC Put GH 40131M109 $16.9M 0.96% 94,800 SH
27 FLUOR CORP Put FLR 343412102 $16.3M 0.92% 339,400 SH
28 ITRON INC Put ITRI 465741106 $15.5M 0.88% 179,700 SH
29 NEXTERA ENERGY INC Put NEE 65339F101 $14.9M 0.84% 196,400 SH
30 ALNYLAM PHARMACEUTICALS INC Put ALNY 02043Q107 $14.7M 0.83% 59,700 SH
31 MP MATERIALS CORP MP 553368101 $14.3M 0.81% 301,468 SH
32 SOUTHERN CO Put SO 842587107 $13.9M 0.78% 167,100 SH
33 SOFI TECHNOLOGIES INC SOFI 83406F102 $12.3M 0.70% 784,273 SH
34 PG&E CORP PCGPX 69331C306 $12.0M 0.68% 381,000 SH
35 WINNEBAGO INDS INC Call WGO 974637100 $11.9M 0.67% 451,000 SH
36 MICROCHIP TECHNOLOGY INC. MCHPP 595017302 $11.7M 0.66% 175,500 SH
37 ON SEMICONDUCTOR CORP ON 682189105 $10.9M 0.61% 141,288 SH
38 ENOVIS CORPORATION Call ENOV 194014502 $10.1M 0.57% 553,000 SH
39 RIVIAN AUTOMOTIVE INC RIVN 76954AAD5 $10.1M 0.57% 10,000,000 PRN
40 COMPASS INC Put COMP 20464U100 $9.8M 0.55% 1,100,000 SH
41 UNITED STS OIL FD LP Put USO 91232N207 $9.6M 0.55% 66,200 SH
42 TYLER TECHNOLOGIES INC Put TYL 902252105 $9.5M 0.54% 29,800 SH
43 RIVIAN AUTOMOTIVE INC Put RIVN 76954A103 $9.4M 0.53% 630,000 SH
44 COREWEAVE INC Put CRWV 21873S108 $7.8M 0.44% 90,000 SH
45 REALTY INCOME CORP Put O 756109104 $7.7M 0.44% 142,200 SH
46 KRANESHARES TRUST Call KWEB 500767306 $7.3M 0.42% 299,500 SH
47 SOFI TECHNOLOGIES INC Put SOFI 83406F102 $7.2M 0.41% 457,600 SH
48 SPECTRUM BRANDS HOLDINGS INC Put SPB 84790A105 $7.2M 0.41% 90,100 SH
49 BLACKLINE INC Put BL 09239B109 $7.1M 0.40% 268,100 SH
50 AKAMAI TECHNOLOGIES INC AKAM 00971T101 $7.1M 0.40% 66,442 SH
Filing History
Period Filed AUM Holdings Accession
2026-09-30 2026-10-15 $1.77B 87 0001172661-26-004537
2026-06-30 2026-07-15 $2.11B 94 0001172661-26-002622
2026-03-31 2026-04-27 $2.60B 102 0001172661-26-001542
2025-12-31 2026-01-23 $2.26B 117 0001172661-26-000284
Filer Information
Address
10 PORTMAN SQUARE
LONDON W1H 6AZ
Phone
44-203-627-6800
Filing Manager
Portman Square Capital LLP
London, X0
Signatory
Petros Toseland
CCO