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 | |
|---|---|---|---|---|---|---|---|
4551
PUT
Hafnia
HAFN
$5.03B
| $163K | ﹤0.01% |
21,400
-800
| -4% | -$5.3K |
2025 Q3
2 quarters
|
|
|
USAS
4552
Americas Gold and Silver
USAS
$1.49B
| $163K | ﹤0.01% |
+31,152
| New | +$228K |
2026 Q1
0 quarters
|
|
4553
Yum China
YUMC
$13.9B
| $162K | ﹤0.01% |
3,325
+1,043
| +46% | +$54K |
2025 Q2
3 quarters
|
|
4554
CALL
VinFast Auto
VFS
$7.16B
| $162K | ﹤0.01% |
42,100
+8,800
| +26% | +$28.8K |
2023 Q3
10 quarters
|
|
4555
PUT
Oshkosh
OSK
$8.08B
| $162K | ﹤0.01% |
1,100
+600
| +120% | +$93.5K |
2017 Q4
33 quarters
|
|
4556
Simon Property Group
SPG
$65B
| $162K | ﹤0.01% |
868
-547
| -39% | -$104K |
2024 Q4
5 quarters
|
|
4557
PUT
Sagimet Biosciences
SGMT
$582M
| $161K | ﹤0.01% |
30,900
+800
| +3% | +$4.46K |
2024 Q2
7 quarters
|
|
4558
PUT
Ericsson
ERIC
$30.1B
| $161K | ﹤0.01% |
+14,300
| New | +$155K |
2026 Q1
0 quarters
|
|
4559
PUT
Vanguard Total Bond Market
BND
$158B
| $161K | ﹤0.01% |
2,300
+1,000
| +77% | +$74.2K |
2019 Q3
26 quarters
|
|
4560
PUT
Kodak
KODK
$964M
| $161K | ﹤0.01% |
17,800
-47,500
| -73% | -$362K |
2021 Q2
19 quarters
|
|
|
THR
4561
DELISTED
Thermon Group Holdings
THR
| $161K | ﹤0.01% |
3,196
-9,296
| -74% | -$433K |
2025 Q3
2 quarters
|
|
4562
CALL
NovaGold Resources
NG
$2.82B
| $161K | ﹤0.01% |
17,900
+14,100
| +371% | +$145K |
2017 Q2
35 quarters
|
|
4563
CALL
TRX Gold Corp
TRX
$383M
| $161K | ﹤0.01% |
107,100
+105,500
| +6,594% | +$156K |
2025 Q4
1 quarter
|
|
4564
BBVA Argentina
BBAR
$2.54B
| $160K | ﹤0.01% |
9,990
-28,332
| -74% | -$470K |
2025 Q1
4 quarters
|
|
|
IA
4565
CALL
Innovative Solutions & Support
IA
$333M
| $160K | ﹤0.01% |
+7,800
| New | +$181K |
2026 Q1
0 quarters
|
|
4566
Capital Southwest
CSWC
$1.48B
| $160K | ﹤0.01% |
7,233
-20,521
| -74% | -$465K |
2025 Q1
4 quarters
|
|
4567
CALL
SPX Corp
SPXC
$8.5B
| $160K | ﹤0.01% |
800
+400
| +100% | +$85.9K |
2025 Q4
1 quarter
|
|
|
SOLS
4568
CALL
Solstice Advanced Materials
SOLS
$9.05B
| $160K | ﹤0.01% |
2,100
-34,800
| -94% | -$2.39M |
2025 Q4
1 quarter
|
|
4569
CALL
ReNew
RNW
$2.49B
| $160K | ﹤0.01% |
34,900
-225,800
| -87% | -$1.2M |
2021 Q4
17 quarters
|
|
4570
PUT
Mineralys Therapeutics
MLYS
$2.1B
| $160K | ﹤0.01% |
5,900
+1,800
| +44% | +$52.8K |
2025 Q3
2 quarters
|
|
4571
Cooper-Standard Automotive
CPS
$389M
| $160K | ﹤0.01% |
5,727
-3,498
| -38% | -$117K |
2024 Q3
6 quarters
|
|
4572
Summit Therapeutics
SMMT
$13.3B
| $159K | ﹤0.01% |
+8,410
| New | +$136K |
2026 Q1
0 quarters
|
|
4573
CALL
Protara Therapeutics
TARA
$163M
| $159K | ﹤0.01% |
30,600
-26,500
| -46% | -$157K |
2025 Q3
2 quarters
|
|
4574
Invesco S&P SmallCap Energy ETF
PSCE
$104M
| $159K | ﹤0.01% |
+2,609
| New | +$139K |
2026 Q1
0 quarters
|
|
|
HUYA
4575
CALL
Huya Inc
HUYA
$523M
| $159K | ﹤0.01% |
48,200
-100,300
| -68% | -$370K |
2020 Q4
21 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.