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 | |
|---|---|---|---|---|---|---|---|
6626
CALL
Savers
SVV
$1.42B
| $23.8K | ﹤0.01% |
3,200
| – | – |
2024 Q4
5 quarters
|
|
|
PLTD
6627
Direxion Dailly PLTR Bear 1X ETF
PLTD
$32.3M
| $23.8K | ﹤0.01% |
+3,169
| New | +$23.8K |
2026 Q1
0 quarters
|
|
6628
PUT
Vuzix
VUZI
$243M
| $23.8K | ﹤0.01% |
10,300
-86,800
| -89% | -$237K |
2018 Q4
29 quarters
|
|
6629
CALL
MoneyHero
MNY
$30.9M
| $23.8K | ﹤0.01% |
18,000
-6,200
| -26% | -$8.22K |
2025 Q3
2 quarters
|
|
|
STKE
6630
CALL
Sol Strategies Inc
STKE
$66.3M
| $23.7K | ﹤0.01% |
24,100
-75,400
| -76% | -$118K |
2025 Q3
2 quarters
|
|
6631
PUT
Oaktree Specialty Lending
OCSL
$1.06B
| $23.7K | ﹤0.01% |
+2,100
| New | +$25.1K |
2026 Q1
0 quarters
|
|
6632
PUT
Innoviz Technologies
INVZ
$107M
| $23.7K | ﹤0.01% |
37,500
-7,400
| -16% | -$6.76K |
2021 Q2
19 quarters
|
|
6633
Gran Tierra Energy
GTE
$354M
| $23.7K | ﹤0.01% |
2,639
-8,524
| -76% | -$54K |
2024 Q3
6 quarters
|
|
6634
PUT
Health Catalyst
HCAT
$128M
| $23.6K | ﹤0.01% |
+18,600
| New | +$35K |
2026 Q1
0 quarters
|
|
6635
PUT
iRhythm Holdings
IRTC
$3.66B
| $23.6K | ﹤0.01% |
200
-2,400
| -92% | -$346K |
2019 Q1
28 quarters
|
|
6636
PUT
W&T Offshore
WTI
$548M
| $23.5K | ﹤0.01% |
6,900
+700
| +11% | +$1.73K |
2021 Q2
19 quarters
|
|
6637
Resources Connection
RGP
$132M
| $23.5K | ﹤0.01% |
+6,306
| New | +$25.8K |
2026 Q1
0 quarters
|
|
|
VRTL
6638
GraniteShares 2x Long VRT Daily ETF
VRTL
$41.7M
| $23.5K | ﹤0.01% |
696
+516
| +287% | +$15.1K |
2025 Q3
2 quarters
|
|
|
BLDP
6639
PUT
Ballard Power Systems
BLDP
$709M
| $23.5K | ﹤0.01% |
9,700
+300
| +3% | +$716 |
2025 Q3
2 quarters
|
|
|
CEPU
6640
Central Puerto
CEPU
$1.77B
| $23.4K | ﹤0.01% |
1,393
| – | – |
2024 Q3
6 quarters
|
|
6641
Boston Omaha
BOC
$391M
| $23.4K | ﹤0.01% |
2,005
-3,097
| -61% | -$38.2K |
2025 Q2
3 quarters
|
|
6642
Liquidity Services
LQDT
$1.37B
| $23.4K | ﹤0.01% |
+766
| New | +$23.8K |
2026 Q1
0 quarters
|
|
|
SHOE
6643
PUT
Shoe Station Group
SHOE
$345M
| $23.4K | ﹤0.01% |
1,500
-3,400
| -69% | -$64.6K |
2020 Q4
21 quarters
|
|
|
LAR
6644
PUT
Lithium Argentina AG
LAR
$909M
| $23.4K | ﹤0.01% |
3,500
-13,900
| -80% | -$99.4K |
2023 Q4
9 quarters
|
|
6645
CALL
iHeartMedia
IHRT
$325M
| $23.4K | ﹤0.01% |
8,000
| – | – |
2025 Q3
2 quarters
|
|
6646
Lifecore Biomedical
LFCR
$248M
| $23.4K | ﹤0.01% |
6,277
+4,949
| +373% | +$34.2K |
2025 Q3
2 quarters
|
|
6647
CALL
Mayville Engineering Co
MEC
$400M
| $23.3K | ﹤0.01% |
1,300
+900
| +225% | +$17.3K |
2025 Q4
1 quarter
|
|
6648
PUT
National Vision
EYE
$1.3B
| $23.3K | ﹤0.01% |
900
-200
| -18% | -$5.43K |
2022 Q2
15 quarters
|
|
6649
CALL
Provident Financial Services
PFS
$2.91B
| $23.3K | ﹤0.01% |
1,100
+600
| +120% | +$12.8K |
2025 Q4
1 quarter
|
|
6650
Protara Therapeutics
TARA
$163M
| $23.2K | ﹤0.01% |
+4,449
| New | +$26.3K |
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.