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 | |
|---|---|---|---|---|---|---|---|
5776
CALL
Nomad Foods
NOMD
$1.48B
| $54.8K | ﹤0.01% |
5,700
-32,200
| -85% | -$370K |
2022 Q4
13 quarters
|
|
|
5777
PUT
Nomad Foods
NOMD
$1.48B
| $54.8K | ﹤0.01% |
5,700
+400
| +8% | +$4.59K |
2025 Q1
4 quarters
|
|
5778
MiMedx Group
MDXG
$674M
| $54.7K | ﹤0.01% |
13,856
+8,870
| +178% | +$44.7K |
2025 Q4
1 quarter
|
|
5779
PUT
Global Partners
GLP
$1.59B
| $54.7K | ﹤0.01% |
1,300
-300
| -19% | -$13.9K |
2025 Q3
2 quarters
|
|
5780
PUT
Brookdale Senior Living
BKD
$2.59B
| $54.7K | ﹤0.01% |
+4,000
| New | +$56K |
2026 Q1
0 quarters
|
|
5781
PUT
Playboy Inc
PLBY
$125M
| $54.7K | ﹤0.01% |
36,000
+30,700
| +579% | +$56.1K |
2021 Q1
20 quarters
|
|
|
KDEF
5782
PLUS Korea Defense Industry Index ETF
KDEF
$114M
| $54.7K | ﹤0.01% |
+1,037
| New | +$58.6K |
2026 Q1
0 quarters
|
|
|
SEE
5783
PUT
DELISTED
Sealed Air
SEE
| $54.7K | ﹤0.01% |
1,300
-700
| -35% | -$29.3K |
2023 Q2
11 quarters
|
|
5784
First Citizens BancShares
FCNCA
$23.4B
| $54.7K | ﹤0.01% |
+29
| New | +$58.2K |
2026 Q1
0 quarters
|
|
5785
CALL
Senseonics Holdings Inc
SENS
$526M
| $54.6K | ﹤0.01% |
8,800
-12,200
| -58% | -$86K |
2019 Q1
28 quarters
|
|
|
ASMG
5786
Leverage Shares 2X Long ASML Daily ETF
ASMG
$37.7M
| $54.6K | ﹤0.01% |
1,723
-1,578
| -48% | -$56.2K |
2025 Q2
3 quarters
|
|
|
TOPW
5787
Roundhill Top WeeklyPay ETF
TOPW
$146M
| $54.6K | ﹤0.01% |
1,642
-504
| -23% | -$18.9K |
2025 Q3
2 quarters
|
|
5788
PUT
SITE Centers
SITC
$183M
| $54.5K | ﹤0.01% |
10,100
+10,000
| +10,000% | +$61.3K |
2025 Q4
1 quarter
|
|
5789
CALL
Southern First Bancshares
SFST
$572M
| $54.5K | ﹤0.01% |
1,000
| – | – |
2025 Q3
2 quarters
|
|
5790
PUT
Compass Therapeutics
CMPX
$162M
| $54.5K | ﹤0.01% |
10,300
+9,800
| +1,960% | +$56.6K |
2025 Q1
4 quarters
|
|
5791
CALL
Protalix BioTherapeutics
PLX
$218M
| $54.5K | ﹤0.01% |
+25,100
| New | +$62.3K |
2026 Q1
0 quarters
|
|
5792
PUT
Malibu Boats
MBUU
$454M
| $54.4K | ﹤0.01% |
2,100
+2,000
| +2,000% | +$59.7K |
2019 Q2
27 quarters
|
|
5793
CALL
CACI
CACI
$13.7B
| $54.4K | ﹤0.01% |
+100
| New | +$60.2K |
2026 Q1
0 quarters
|
|
5794
CALL
CMS Energy
CMS
$20B
| $54.3K | ﹤0.01% |
700
-600
| -46% | -$44.5K |
2021 Q2
19 quarters
|
|
|
HUMN
5795
Roundhill Humanoid Robotics ETF
HUMN
$94.6M
| $54.3K | ﹤0.01% |
1,925
-23,915
| -93% | -$753K |
2025 Q3
2 quarters
|
|
5796
CALL
Cognyte Software
CGNT
$641M
| $54.3K | ﹤0.01% |
6,700
+100
| +2% | +$825 |
2022 Q3
14 quarters
|
|
5797
Flux Power
FLUX
$12.7M
| $54.2K | ﹤0.01% |
+50,687
| New | +$69.6K |
2026 Q1
0 quarters
|
|
5798
The Bancorp
TBBK
$1.99B
| $54.2K | ﹤0.01% |
+1,008
| New | +$60.3K |
2026 Q1
0 quarters
|
|
5799
CALL
Fortress Biotech
FBIO
$68M
| $54.1K | ﹤0.01% |
19,400
-85,400
| -81% | -$290K |
2024 Q3
6 quarters
|
|
5800
Fidelity MSCI Energy Index ETF
FENY
$2.1B
| $54.1K | ﹤0.01% |
+1,591
| New | +$47.3K |
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.