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 | |
|---|---|---|---|---|---|---|---|
4051
PUT
Oxford Industries
OXM
$380M
| $246K | ﹤0.01% |
6,400
+2,600
| +68% | +$98K |
2025 Q1
4 quarters
|
|
4052
CALL
Mach Natural Resources
MNR
$1.72B
| $246K | ﹤0.01% |
17,600
+13,600
| +340% | +$171K |
2025 Q4
1 quarter
|
|
4053
Keros Therapeutics
KROS
$223M
| $246K | ﹤0.01% |
+22,288
| New | +$344K |
2026 Q1
0 quarters
|
|
4054
CALL
Hallador Energy
HNRG
$637M
| $246K | ﹤0.01% |
15,100
-400
| -3% | -$7.46K |
2023 Q4
9 quarters
|
|
|
GRFS
4055
CALL
Grifois
GRFS
$4.97B
| $245K | ﹤0.01% |
30,500
+400
| +1% | +$3.53K |
2019 Q3
26 quarters
|
|
4056
PUT
Aclaris Therapeutics
ACRS
$649M
| $245K | ﹤0.01% |
+65,200
| New | +$220K |
2026 Q1
0 quarters
|
|
4057
PUT
Sabesp
SBS
$18.5B
| $244K | ﹤0.01% |
+40,000
| New | +$220K |
2026 Q1
0 quarters
|
|
4058
CALL
Kodiak Sciences
KOD
$6.19B
| $244K | ﹤0.01% |
6,400
+4,100
| +178% | +$106K |
2019 Q4
25 quarters
|
|
4059
CALL
Upwork
UPWK
$1.04B
| $243K | ﹤0.01% |
22,200
-36,700
| -62% | -$578K |
2018 Q4
29 quarters
|
|
4060
CALL
UDR
UDR
$10.8B
| $243K | ﹤0.01% |
7,200
+2,300
| +47% | +$84.5K |
2023 Q3
10 quarters
|
|
4061
Bruker
BRKR
$9.44B
| $243K | ﹤0.01% |
6,729
+3,493
| +108% | +$146K |
2025 Q3
2 quarters
|
|
4062
Liberty Global Class C
LBTYK
$3B
| $243K | ﹤0.01% |
+20,715
| New | +$237K |
2026 Q1
0 quarters
|
|
4063
CALL
Valvoline
VVV
$3.93B
| $242K | ﹤0.01% |
7,200
-63,300
| -90% | -$2.19M |
2018 Q2
31 quarters
|
|
4064
Intapp
INTA
$2.88B
| $242K | ﹤0.01% |
9,434
+8,173
| +648% | +$244K |
2024 Q4
5 quarters
|
|
4065
CALL
Anavex Life Sciences
AVXL
$175M
| $242K | ﹤0.01% |
78,900
-199,400
| -72% | -$864K |
2021 Q2
19 quarters
|
|
4066
CALL
FT Vest Gold Strategy Target Income ETF
IGLD
$592M
| $242K | ﹤0.01% |
2,600
-12,300
| -83% | -$332K |
2022 Q2
15 quarters
|
|
|
BSOL
4067
PUT
Bitwise Solana Staking ETF
BSOL
$962M
| $242K | ﹤0.01% |
21,900
+21,200
| +3,029% | +$287K |
2025 Q4
1 quarter
|
|
4068
Monte Rosa Therapeutics
GLUE
$961M
| $242K | ﹤0.01% |
14,710
-20,414
| -58% | -$390K |
2025 Q3
2 quarters
|
|
4069
Trevi Therapeutics
TRVI
$2.02B
| $242K | ﹤0.01% |
20,277
-26,857
| -57% | -$301K |
2025 Q3
2 quarters
|
|
4070
CALL
Autoliv
ALV
$8.28B
| $242K | ﹤0.01% |
2,300
-4,900
| -68% | -$578K |
2019 Q1
28 quarters
|
|
|
VWAV
4071
CALL
VisionWave Holdings
VWAV
$10.7M
| $242K | ﹤0.01% |
2,550
+1,815
| +247% | +$324K |
2025 Q3
2 quarters
|
|
4072
Redwire
RDW
$2.64B
| $242K | ﹤0.01% |
+28,427
| New | +$278K |
2026 Q1
0 quarters
|
|
4073
CALL
Gossamer Bio
GOSS
$66.9M
| $242K | ﹤0.01% |
9,191
-10,692
| -54% | -$1.34M |
2020 Q4
21 quarters
|
|
4074
CALL
QuinStreet
QNST
$854M
| $241K | ﹤0.01% |
20,100
+19,800
| +6,600% | +$251K |
2025 Q3
2 quarters
|
|
4075
PUT
Lightbridge
LTBR
$221M
| $241K | ﹤0.01% |
22,600
-4,300
| -16% | -$59.7K |
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.