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 | |
|---|---|---|---|---|---|---|---|
5251
Northern Oil and Gas
NOG
$2.54B
| $87.5K | ﹤0.01% |
+2,995
| New | +$77.5K |
2026 Q1
0 quarters
|
|
5252
TransUnion
TRU
$12.2B
| $87.5K | ﹤0.01% |
1,264
+814
| +181% | +$62.3K |
2025 Q2
3 quarters
|
|
5253
CALL
Arqit Quantum
ARQQ
$428M
| $87.5K | ﹤0.01% |
6,600
-5,000
| -43% | -$94.1K |
2025 Q1
4 quarters
|
|
5254
CALL
Outfront Media
OUT
$5.06B
| $87.5K | ﹤0.01% |
3,300
-14,300
| -81% | -$373K |
2023 Q4
9 quarters
|
|
5255
CALL
Pacific Biosciences
PACB
$790M
| $87.4K | ﹤0.01% |
+66,200
| New | +$118K |
2026 Q1
0 quarters
|
|
5256
CALL
Grupo Cibest SA
CIB
$21.7B
| $87.4K | ﹤0.01% |
1,200
-1,300
| -52% | -$95.6K |
2023 Q3
10 quarters
|
|
5257
PUT
Petco
WOOF
$627M
| $87.3K | ﹤0.01% |
+31,400
| New | +$86.9K |
2026 Q1
0 quarters
|
|
5258
PUT
Expro Ltd
XPRO
$1.83B
| $87K | ﹤0.01% |
5,000
-11,300
| -69% | -$186K |
2025 Q2
3 quarters
|
|
5259
PUT
Angi Inc
ANGI
$245M
| $87K | ﹤0.01% |
12,700
+11,400
| +877% | +$114K |
2024 Q1
8 quarters
|
|
5260
CALL
Gray Television
GTN
$468M
| $86.8K | ﹤0.01% |
20,000
+15,100
| +308% | +$70.9K |
2023 Q4
9 quarters
|
|
5261
CALL
loanDepot
LDI
$215M
| $86.8K | ﹤0.01% |
61,100
-315,000
| -84% | -$648K |
2023 Q1
12 quarters
|
|
5262
CALL
Brookfield Infrastructure Partners
BIP
$16.8B
| $86.7K | ﹤0.01% |
2,400
+700
| +41% | +$25.7K |
2017 Q2
35 quarters
|
|
5263
PUT
Mitsubishi UFJ Financial
MUFG
$257B
| $86.5K | ﹤0.01% |
+5,100
| New | +$90.8K |
2026 Q1
0 quarters
|
|
|
DEFT
5264
Defi Technologies
DEFT
$206M
| $86.5K | ﹤0.01% |
+156,510
| New | +$119K |
2026 Q1
0 quarters
|
|
5265
CALL
Utz Brands
UTZ
$1.26B
| $86.3K | ﹤0.01% |
10,900
+6,700
| +160% | +$62.2K |
2020 Q3
22 quarters
|
|
5266
VinFast Auto
VFS
$7.11B
| $86.2K | ﹤0.01% |
22,383
+17,194
| +331% | +$56.3K |
2024 Q1
8 quarters
|
|
5267
Richtech Robotics
RR
$378M
| $86.1K | ﹤0.01% |
41,201
-496,116
| -92% | -$1.53M |
2025 Q3
2 quarters
|
|
|
LTM
5268
LATAM Airlines Group S.A.
LTM
$13.8B
| $86.1K | ﹤0.01% |
1,741
+962
| +123% | +$54.4K |
2025 Q4
1 quarter
|
|
5269
CALL
Live Oak Bancshares
LOB
$1.7B
| $86K | ﹤0.01% |
+2,600
| New | +$95.8K |
2026 Q1
0 quarters
|
|
5270
PUT
Editas Medicine
EDIT
$402M
| $86K | ﹤0.01% |
34,800
+13,800
| +66% | +$29.2K |
2021 Q2
19 quarters
|
|
5271
Voyager Therapeutics
VYGR
$151M
| $85.9K | ﹤0.01% |
22,261
+14,126
| +174% | +$55.6K |
2025 Q4
1 quarter
|
|
5272
Iridium Communications
IRDM
$5.19B
| $85.9K | ﹤0.01% |
3,097
-5,690
| -65% | -$128K |
2025 Q3
2 quarters
|
|
5273
GATX Corp
GATX
$6.04B
| $85.9K | ﹤0.01% |
+503
| New | +$90.5K |
2026 Q1
0 quarters
|
|
5274
CALL
NETSCOUT
NTCT
$2.98B
| $85.8K | ﹤0.01% |
2,700
-4,400
| -62% | -$128K |
2025 Q4
1 quarter
|
|
5275
PUT
Thryv Holdings
THRY
$67.5M
| $85.8K | ﹤0.01% |
+31,300
| New | +$123K |
2026 Q1
0 quarters
|
|
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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.