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 | |
|---|---|---|---|---|---|---|---|
6601
iShares MSCI Japan Small-Cap ETF
SCJ
$261M
| $24.5K | ﹤0.01% |
+252
| New | +$24.9K |
2026 Q1
0 quarters
|
|
6602
Oportun Financial
OPRT
$378M
| $24.5K | ﹤0.01% |
5,306
+3,390
| +177% | +$17.3K |
2024 Q2
7 quarters
|
|
6603
CALL
Flywire
FLYW
$2.14B
| $24.4K | ﹤0.01% |
2,100
-21,300
| -91% | -$268K |
2022 Q1
16 quarters
|
|
6604
Dynagas LNG Partners
DLNG
$138M
| $24.4K | ﹤0.01% |
+5,710
| New | +$22.6K |
2026 Q1
0 quarters
|
|
6605
PUT
Movado Group
MOV
$758M
| $24.4K | ﹤0.01% |
1,000
+400
| +67% | +$9.47K |
2025 Q4
1 quarter
|
|
|
INVX
6606
CALL
Innovex International
INVX
$1.92B
| $24.4K | ﹤0.01% |
+1,000
| New | +$25.1K |
2026 Q1
0 quarters
|
|
6607
PUT
Zumiez
ZUMZ
$207M
| $24.4K | ﹤0.01% |
1,100
-200
| -15% | -$4.87K |
2018 Q1
32 quarters
|
|
6608
Schwab International Equity ETF
SCHF
$67.2B
| $24.4K | ﹤0.01% |
+984
| New | +$25K |
2026 Q1
0 quarters
|
|
|
AIRO
6609
PUT
AIRO Group Holdings
AIRO
$206M
| $24.3K | ﹤0.01% |
3,200
-200
| -6% | -$2.08K |
2025 Q3
2 quarters
|
|
6610
CALL
Aramark
ARMK
$14.4B
| $24.3K | ﹤0.01% |
600
-5,100
| -89% | -$202K |
2017 Q3
34 quarters
|
|
6611
PUT
Rapid7
RPD
$813M
| $24.2K | ﹤0.01% |
4,400
-500
| -10% | -$4.59K |
2018 Q1
32 quarters
|
|
6612
PUT
Natural Resource Partners
NRP
$1.41B
| $24.2K | ﹤0.01% |
200
-100
| -33% | -$11.9K |
2025 Q3
2 quarters
|
|
|
CRESY
6613
Cresud
CRESY
$806M
| $24.1K | ﹤0.01% |
+1,894
| New | +$23K |
2026 Q1
0 quarters
|
|
6614
PUT
Freshworks
FRSH
$3.43B
| $24.1K | ﹤0.01% |
3,000
-100
| -3% | -$923 |
2021 Q4
17 quarters
|
|
6615
PUT
Marqeta
MQ
$1.77B
| $24.1K | ﹤0.01% |
1,475
-3,025
| -67% | -$51K |
2021 Q2
19 quarters
|
|
6616
PUT
Cytek Biosciences
CTKB
$755M
| $24K | ﹤0.01% |
5,500
| – | – |
2025 Q1
4 quarters
|
|
6617
PUT
CryoPort
CYRX
$879M
| $24K | ﹤0.01% |
2,900
-20,200
| -87% | -$182K |
2019 Q4
25 quarters
|
|
6618
WillScot Mobile Mini Holdings
WSC
$3.12B
| $24K | ﹤0.01% |
1,383
-5,861
| -81% | -$120K |
2025 Q2
3 quarters
|
|
6619
PUT
Frontier Group Holdings
ULCC
$1.37B
| $24K | ﹤0.01% |
6,800
-82,600
| -92% | -$378K |
2025 Q4
1 quarter
|
|
6620
SIGA Technologies
SIGA
$241M
| $24K | ﹤0.01% |
4,483
+2,011
| +81% | +$12.5K |
2023 Q1
12 quarters
|
|
6621
Claros Mortgage Trust
CMTG
$171M
| $24K | ﹤0.01% |
10,074
+3,646
| +57% | +$9.44K |
2024 Q2
7 quarters
|
|
|
NMG
6622
Nouveau Monde Graphite
NMG
$385M
| $23.9K | ﹤0.01% |
10,670
-21,117
| -66% | -$51.5K |
2025 Q1
4 quarters
|
|
6623
CALL
U-Haul Holding Co Series N
UHAL.B
$10.5B
| $23.9K | ﹤0.01% |
+500
| New | +$23.7K |
2026 Q1
0 quarters
|
|
6624
PUT
NerdWallet
NRDS
$548M
| $23.9K | ﹤0.01% |
2,300
+2,000
| +667% | +$22.5K |
2021 Q4
17 quarters
|
|
6625
PUT
LSB Industries
LXU
$703M
| $23.8K | ﹤0.01% |
+1,600
| New | +$18.2K |
2026 Q1
0 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.