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 | |
|---|---|---|---|---|---|---|---|
|
AIFC
5026
AI Financial Corp
AIFC
$70.4M
| $105K | ﹤0.01% |
+94,741
| New | +$154K |
2026 Q1
0 quarters
|
|
5027
ProShares Ether Strategy ETF
EETH
$72.6M
| $105K | ﹤0.01% |
4,049
-145
| -3% | -$4.32K |
2025 Q3
2 quarters
|
|
|
LAND
5028
CALL
Gladstone Land Corp
LAND
$412M
| $105K | ﹤0.01% |
10,300
-25,200
| -71% | -$271K |
2018 Q2
31 quarters
|
|
5029
CALL
Certara
CERT
$1.43B
| $105K | ﹤0.01% |
18,400
+14,900
| +426% | +$114K |
2021 Q4
17 quarters
|
|
5030
Trump Media & Technology Group
DJT
$2.48B
| $105K | ﹤0.01% |
+11,294
| New | +$130K |
2026 Q1
0 quarters
|
|
|
OS
5031
DELISTED
OneStream Inc
OS
| $105K | ﹤0.01% |
4,363
-24,695
| -85% | -$579K |
2025 Q3
2 quarters
|
|
5032
PUT
Bumble
BMBL
$335M
| $105K | ﹤0.01% |
32,100
-30,700
| -49% | -$102K |
2021 Q1
20 quarters
|
|
5033
RLX Technology
RLX
$2.09B
| $104K | ﹤0.01% |
47,470
-285,806
| -86% | -$658K |
2025 Q1
4 quarters
|
|
5034
Telos
TLS
$313M
| $104K | ﹤0.01% |
24,855
+15,634
| +170% | +$73.9K |
2025 Q3
2 quarters
|
|
|
USAS
5035
PUT
Americas Gold and Silver
USAS
$1.49B
| $104K | ﹤0.01% |
+19,900
| New | +$145K |
2026 Q1
0 quarters
|
|
5036
CALL
Stratasys
SSYS
$762M
| $104K | ﹤0.01% |
13,300
-133,600
| -91% | -$1.31M |
2021 Q2
19 quarters
|
|
5037
CALL
Maravai LifeSciences
MRVI
$1.18B
| $104K | ﹤0.01% |
+36,700
| New | +$124K |
2026 Q1
0 quarters
|
|
5038
CALL
Arteris
AIP
$1.21B
| $104K | ﹤0.01% |
6,300
-77,700
| -93% | -$1.23M |
2024 Q4
5 quarters
|
|
|
AGEN
5039
CALL
Agenus
AGEN
$378M
| $104K | ﹤0.01% |
31,000
-24,200
| -44% | -$80.3K |
2018 Q1
32 quarters
|
|
5040
ChargePoint
CHPT
$249M
| $104K | ﹤0.01% |
21,301
-827
| -4% | -$5.04K |
2024 Q1
8 quarters
|
|
|
ZEPP
5041
Zepp Health
ZEPP
$56M
| $103K | ﹤0.01% |
8,651
+7,430
| +609% | +$152K |
2025 Q4
1 quarter
|
|
5042
PUT
Krystal Biotech
KRYS
$9.54B
| $103K | ﹤0.01% |
400
+200
| +100% | +$53.2K |
2021 Q2
19 quarters
|
|
5043
CALL
AmpliTech
AMPG
$91.6M
| $103K | ﹤0.01% |
54,300
+43,300
| +394% | +$128K |
2025 Q4
1 quarter
|
|
5044
Amplify Lithium & Battery Technology ETF
BATT
$114M
| $103K | ﹤0.01% |
6,920
+3,647
| +111% | +$55.3K |
2025 Q3
2 quarters
|
|
5045
PUT
Exelixis
EXEL
$14.5B
| $103K | ﹤0.01% |
2,400
-5,700
| -70% | -$245K |
2021 Q2
19 quarters
|
|
5046
CALL
Schneider National
SNDR
$5.77B
| $103K | ﹤0.01% |
3,900
+200
| +5% | +$5.53K |
2025 Q4
1 quarter
|
|
5047
CALL
Veritone
VERI
$76.1M
| $103K | ﹤0.01% |
52,100
-254,400
| -83% | -$860K |
2018 Q4
29 quarters
|
|
5048
PUT
Lufax Holding
LU
$884M
| $102K | ﹤0.01% |
54,800
-241,000
| -81% | -$609K |
2020 Q4
21 quarters
|
|
|
NUVL
5049
CALL
DELISTED
Nuvalent
NUVL
| $102K | ﹤0.01% |
1,000
-8,400
| -89% | -$856K |
2025 Q4
1 quarter
|
|
|
NUVL
5050
PUT
DELISTED
Nuvalent
NUVL
| $102K | ﹤0.01% |
1,000
-100
| -9% | -$10.2K |
2024 Q2
7 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.