Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.3% |
| 2 | Technology | 0.62% |
| 3 | Communication Services | 0.22% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Healthcare | 0.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
4026
CALL
New York Times
NYT
$10.3B
| $251K | ﹤0.01% |
3,000
-2,800
| -48% | -$212K |
2016 Q4
37 quarters
|
|
4027
PUT
Enviri
NVRI
$549M
| $251K | ﹤0.01% |
12,800
-60,600
| -83% | -$1.13M |
2024 Q3
6 quarters
|
|
|
UPB
4028
CALL
Upstream Bio Inc
UPB
$276M
| $251K | ﹤0.01% |
+27,900
| New | +$502K |
2026 Q1
0 quarters
|
|
4029
CALL
Atomera
ATOM
$183M
| $251K | ﹤0.01% |
65,900
-12,400
| -16% | -$46.7K |
2020 Q3
22 quarters
|
|
4030
Direxion Daily S&P 500 High Beta Bear 3X ETF
HIBS
$20.3M
| $251K | ﹤0.01% |
+5,330
| New | +$236K |
2026 Q1
0 quarters
|
|
4031
PUT
SEALSQ Corp
LAES
$531M
| $251K | ﹤0.01% |
95,700
+50,700
| +113% | +$198K |
2025 Q1
4 quarters
|
|
4032
State Street SPDR S&P Aerospace & Defense ETF
XAR
$5.55B
| $251K | ﹤0.01% |
+987
| New | +$270K |
2026 Q1
0 quarters
|
|
4033
Cullinan Oncology
CGEM
$935M
| $251K | ﹤0.01% |
17,631
+4,378
| +33% | +$56.3K |
2024 Q3
6 quarters
|
|
4034
CALL
New Fortress Energy
NFE
$33.8M
| $250K | ﹤0.01% |
8,484
+2,538
| +43% | +$148K |
2020 Q3
22 quarters
|
|
4035
Invesco
IVZ
$13.4B
| $250K | ﹤0.01% |
10,300
-44,704
| -81% | -$1.17M |
2023 Q4
9 quarters
|
|
4036
Alight
ALIT
$239M
| $250K | ﹤0.01% |
21,450
+8,210
| +62% | +$196K |
2025 Q1
4 quarters
|
|
4037
PUT
Flowserve
FLS
$9.29B
| $250K | ﹤0.01% |
3,400
-1,600
| -32% | -$127K |
2025 Q4
1 quarter
|
|
|
PR
4038
Permian Resources
PR
$18.4B
| $249K | ﹤0.01% |
+11,697
| New | +$202K |
2026 Q1
0 quarters
|
|
4039
Reliance Steel & Aluminium
RS
$20.1B
| $249K | ﹤0.01% |
819
+337
| +70% | +$107K |
2025 Q1
4 quarters
|
|
4040
CALL
Viridian Therapeutics
VRDN
$2.15B
| $248K | ﹤0.01% |
12,700
+10,100
| +388% | +$300K |
2022 Q3
14 quarters
|
|
4041
CALL
Riley Exploration Permian
REPX
$910M
| $248K | ﹤0.01% |
+6,800
| New | +$202K |
2026 Q1
0 quarters
|
|
|
TPH
4042
PUT
DELISTED
Tri Pointe Homes
TPH
| $248K | ﹤0.01% |
5,300
+1,700
| +47% | +$69.2K |
2019 Q3
26 quarters
|
|
4043
CALL
Brookdale Senior Living
BKD
$2.59B
| $248K | ﹤0.01% |
18,100
+15,700
| +654% | +$220K |
2018 Q1
32 quarters
|
|
|
EUAD
4044
Select STOXX Europe Aerospace & Defense ETF
EUAD
$1.05B
| $247K | ﹤0.01% |
6,073
-3,594
| -37% | -$162K |
2025 Q4
1 quarter
|
|
4045
Corteva
CTVA
$8.39B
| $247K | ﹤0.01% |
2,955
-562
| -16% | -$42.3K |
2025 Q2
3 quarters
|
|
4046
PUT
Meritage Homes
MTH
$4.2B
| $247K | ﹤0.01% |
4,000
-800
| -17% | -$56.5K |
2018 Q2
31 quarters
|
|
|
LADR
4047
CALL
Ladder Capital
LADR
$1.11B
| $247K | ﹤0.01% |
25,300
+20,700
| +450% | +$218K |
2018 Q2
31 quarters
|
|
4048
CALL
nCino
NCNO
$2.05B
| $247K | ﹤0.01% |
16,500
-30,900
| -65% | -$581K |
2020 Q3
22 quarters
|
|
|
GAU
4049
CALL
Galiano Gold
GAU
$510M
| $247K | ﹤0.01% |
98,400
+53,800
| +121% | +$152K |
2024 Q1
8 quarters
|
|
4050
Kimco Realty
KIM
$14.9B
| $247K | ﹤0.01% |
10,991
+3,353
| +44% | +$73.9K |
2025 Q2
3 quarters
|
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,157 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.