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 | |
|---|---|---|---|---|---|---|---|
3976
PUT
J&J Snack Foods
JJSF
$1.45B
| $262K | ﹤0.01% |
3,300
-200
| -6% | -$17.3K |
2025 Q2
3 quarters
|
|
3977
Cadiz
CDZI
$313M
| $261K | ﹤0.01% |
53,213
-82,736
| -61% | -$452K |
2025 Q1
4 quarters
|
|
|
DPRO
3978
PUT
Draganfly
DPRO
$215M
| $261K | ﹤0.01% |
53,200
+1,800
| +4% | +$13.3K |
2025 Q3
2 quarters
|
|
3979
PUT
Fortuna Silver Mines
FSM
$3.31B
| $261K | ﹤0.01% |
26,300
-17,700
| -40% | -$192K |
2018 Q2
31 quarters
|
|
|
AMTM
3980
PUT
Amentum Holdings
AMTM
$4.52B
| $261K | ﹤0.01% |
10,000
-10,800
| -52% | -$339K |
2024 Q4
5 quarters
|
|
3981
PUT
Erasca
ERAS
$5.1B
| $260K | ﹤0.01% |
16,100
+11,000
| +216% | +$130K |
2025 Q3
2 quarters
|
|
|
LGO
3982
CALL
Largo
LGO
$54.6M
| $260K | ﹤0.01% |
232,100
+139,800
| +151% | +$191K |
2025 Q3
2 quarters
|
|
3983
CALL
First Trust North American Energy Infrastructure Fund
EMLP
$3.95B
| $260K | ﹤0.01% |
+10,100
| New | +$420K |
2026 Q1
0 quarters
|
|
3984
Rackspace Technology
RXT
$984M
| $260K | ﹤0.01% |
265,216
+261,433
| +6,911% | +$318K |
2025 Q4
1 quarter
|
|
3985
PUT
Vir Biotechnology
VIR
$1.91B
| $260K | ﹤0.01% |
29,000
+27,700
| +2,131% | +$221K |
2021 Q1
20 quarters
|
|
3986
PUT
Palladyne AI
PDYN
$263M
| $260K | ﹤0.01% |
42,800
+37,300
| +678% | +$253K |
2025 Q1
4 quarters
|
|
|
SRG
3987
Seritage Growth Properties
SRG
$95.8M
| $259K | ﹤0.01% |
+92,326
| New | +$288K |
2026 Q1
0 quarters
|
|
3988
iShares Micro-Cap ETF
IWC
$1.39B
| $259K | ﹤0.01% |
1,625
+392
| +32% | +$65K |
2025 Q3
2 quarters
|
|
3989
CALL
Sensient Technologies
SXT
$5.47B
| $259K | ﹤0.01% |
+3,000
| New | +$281K |
2026 Q1
0 quarters
|
|
3990
PUT
Repligen
RGEN
$10B
| $259K | ﹤0.01% |
2,200
+900
| +69% | +$126K |
2021 Q2
19 quarters
|
|
|
DFTX
3991
CALL
Definium Therapeutics
DFTX
$5.05B
| $259K | ﹤0.01% |
13,700
-72,600
| -84% | -$1.23M |
2021 Q2
19 quarters
|
|
3992
PUT
GigaCloud Technology
GCT
$1.9B
| $259K | ﹤0.01% |
5,700
-33,500
| -85% | -$1.36M |
2023 Q4
9 quarters
|
|
|
WRD
3993
PUT
WeRide Inc
WRD
$1.71B
| $258K | ﹤0.01% |
31,900
-90,400
| -74% | -$700K |
2025 Q2
3 quarters
|
|
3994
CALL
Madison Square Garden
MSGS
$9.61B
| $257K | ﹤0.01% |
+800
| New | +$238K |
2026 Q1
0 quarters
|
|
3995
CALL
H&R Block
HRB
$5.18B
| $257K | ﹤0.01% |
8,100
+6,300
| +350% | +$220K |
2016 Q2
39 quarters
|
|
3996
CALL
Agilon Health
AGL
$1.38B
| $257K | ﹤0.01% |
32,500
+32,028
| +6,786% | +$518K |
2021 Q2
19 quarters
|
|
3997
Amplify International Enhanced Dividend Income ETF
IDVO
$1.41B
| $257K | ﹤0.01% |
+6,351
| New | +$263K |
2026 Q1
0 quarters
|
|
|
JKS
3998
CALL
JinkoSolar
JKS
$487M
| $257K | ﹤0.01% |
10,100
-11,900
| -54% | -$314K |
2021 Q2
19 quarters
|
|
3999
PUT
Huazhu Hotels Group
HTHT
$13.3B
| $256K | ﹤0.01% |
5,100
+4,900
| +2,450% | +$250K |
2016 Q4
37 quarters
|
|
|
DCH
4000
PUT
Dauch Corp
DCH
$1.29B
| $256K | ﹤0.01% |
+43,200
| New | +$300K |
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.