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 | |
|---|---|---|---|---|---|---|---|
3926
PUT
NBT Bancorp
NBTB
$2.64B
| $273K | ﹤0.01% |
+6,400
| New | +$278K |
2026 Q1
0 quarters
|
|
3927
ASP Isotopes
ASPI
$414M
| $272K | ﹤0.01% |
61,648
-32,068
| -34% | -$190K |
2024 Q4
5 quarters
|
|
|
SOLS
3928
Solstice Advanced Materials
SOLS
$9.05B
| $272K | ﹤0.01% |
+3,568
| New | +$245K |
2026 Q1
0 quarters
|
|
3929
PUT
Freshpet
FRPT
$2.77B
| $271K | ﹤0.01% |
4,600
-6,300
| -58% | -$443K |
2019 Q1
28 quarters
|
|
3930
Global X Data Center & Digital Infrastructure ETF
DTCR
$2.02B
| $271K | ﹤0.01% |
11,318
+8,501
| +302% | +$208K |
2025 Q3
2 quarters
|
|
3931
PUT
Ocugen
OCGN
$339M
| $271K | ﹤0.01% |
149,700
+129,000
| +623% | +$223K |
2024 Q1
8 quarters
|
|
3932
A10 Networks
ATEN
$2B
| $271K | ﹤0.01% |
11,717
+10,141
| +643% | +$198K |
2025 Q4
1 quarter
|
|
3933
CALL
CPS Technologies
CPSH
$73.5M
| $271K | ﹤0.01% |
72,400
+70,500
| +3,711% | +$312K |
2025 Q3
2 quarters
|
|
|
WTMY
3934
CALL
WisdomTree High Income Laddered Municipal Fund
WTMY
$4.79M
| $270K | ﹤0.01% |
4,300
+2,000
| +87% | +$51.1K |
2025 Q2
3 quarters
|
|
3935
Dorian LPG
LPG
$2.42B
| $270K | ﹤0.01% |
+7,901
| New | +$250K |
2026 Q1
0 quarters
|
|
3936
CALL
Abeona Therapeutics
ABEO
$286M
| $270K | ﹤0.01% |
60,300
+56,700
| +1,575% | +$283K |
2023 Q4
9 quarters
|
|
3937
PUT
Procept Biorobotics
PRCT
$975M
| $270K | ﹤0.01% |
10,800
-1,500
| -12% | -$42.3K |
2023 Q3
10 quarters
|
|
3938
PUT
Aurinia Pharmaceuticals
AUPH
$2.12B
| $270K | ﹤0.01% |
18,200
-16,900
| -48% | -$247K |
2021 Q2
19 quarters
|
|
3939
Sprott Junior Copper Miners ETF
COPJ
$159M
| $270K | ﹤0.01% |
6,916
+3,824
| +124% | +$167K |
2025 Q4
1 quarter
|
|
3940
CALL
MSCI
MSCI
$39.6B
| $270K | ﹤0.01% |
500
+100
| +25% | +$56.4K |
2016 Q3
38 quarters
|
|
3941
Mission Produce
AVO
$1.12B
| $269K | ﹤0.01% |
19,580
+18,814
| +2,456% | +$251K |
2025 Q3
2 quarters
|
|
3942
PUT
Alpha and Omega Semiconductor
AOSL
$873M
| $268K | ﹤0.01% |
12,100
+200
| +2% | +$4.35K |
2024 Q4
5 quarters
|
|
3943
GoDaddy
GDDY
$12.3B
| $268K | ﹤0.01% |
+3,240
| New | +$308K |
2026 Q1
0 quarters
|
|
|
AD
3944
CALL
Array Digital Infrastructure
AD
$2.95B
| $268K | ﹤0.01% |
+5,800
| New | +$289K |
2026 Q1
0 quarters
|
|
3945
CALL
Genius Sports
GENI
$1.52B
| $268K | ﹤0.01% |
60,400
-34,700
| -36% | -$247K |
2021 Q2
19 quarters
|
|
|
ASTX
3946
Tradr 2X Long ASTS Daily ETF
ASTX
$218M
| $267K | ﹤0.01% |
7,346
+5,394
| +276% | +$312K |
2025 Q3
2 quarters
|
|
3947
CALL
Americold
COLD
$3.94B
| $267K | ﹤0.01% |
23,300
-27,200
| -54% | -$341K |
2020 Q1
24 quarters
|
|
3948
PUT
Construction Partners
ROAD
$5.12B
| $267K | ﹤0.01% |
2,400
+2,100
| +700% | +$252K |
2025 Q3
2 quarters
|
|
|
VSNT
3949
CALL
Versant Media Group
VSNT
$4.29B
| $267K | ﹤0.01% |
+7,200
| New | +$243K |
2026 Q1
0 quarters
|
|
3950
PUT
TriCo Bancshares
TCBK
$1.66B
| $266K | ﹤0.01% |
+5,600
| New | +$274K |
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.