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 | |
|---|---|---|---|---|---|---|---|
5576
Candel Therapeutics
CADL
$779M
| $64.8K | ﹤0.01% |
+13,216
| New | +$71.9K |
2026 Q1
0 quarters
|
|
|
GOOS
5577
PUT
Canada Goose Holdings
GOOS
$748M
| $64.7K | ﹤0.01% |
5,900
-9,100
| -61% | -$109K |
2017 Q1
36 quarters
|
|
|
BETA
5578
CALL
Beta Technologies Inc
BETA
$5.19B
| $64.7K | ﹤0.01% |
4,400
+900
| +26% | +$18.5K |
2025 Q4
1 quarter
|
|
5579
CALL
Mirum Pharmaceuticals
MIRM
$5.38B
| $64.7K | ﹤0.01% |
700
-6,200
| -90% | -$583K |
2021 Q4
17 quarters
|
|
|
ADAM
5580
Adamas Trust
ADAM
$702M
| $64.6K | ﹤0.01% |
8,773
+7,336
| +511% | +$58.4K |
2025 Q4
1 quarter
|
|
5581
PUT
Maravai LifeSciences
MRVI
$1.18B
| $64.5K | ﹤0.01% |
+22,800
| New | +$77.3K |
2026 Q1
0 quarters
|
|
5582
CALL
Neurogene
NGNE
$513M
| $64.5K | ﹤0.01% |
+3,200
| New | +$62K |
2026 Q1
0 quarters
|
|
|
PLTG
5583
Leverage Shares 2X Long PLTR Daily ETF
PLTG
$29.6M
| $64.5K | ﹤0.01% |
4,074
+4,031
| +9,374% | +$74.9K |
2025 Q3
2 quarters
|
|
5584
CALL
Yelp
YELP
$991M
| $64.3K | ﹤0.01% |
2,600
-1,200
| -32% | -$30.4K |
2021 Q2
19 quarters
|
|
5585
CALL
American Homes 4 Rent
AMH
$10.9B
| $64.2K | ﹤0.01% |
+2,300
| New | +$69.5K |
2026 Q1
0 quarters
|
|
5586
PUT
Liquidity Services
LQDT
$1.35B
| $64.2K | ﹤0.01% |
2,100
| – | – |
2024 Q4
5 quarters
|
|
5587
Dimensional International Value ETF
DFIV
$21.5B
| $64.1K | ﹤0.01% |
+1,215
| New | +$64.4K |
2026 Q1
0 quarters
|
|
5588
CALL
Odyssey Marine Exploration
OMEX
$39M
| $64.1K | ﹤0.01% |
76,800
+43,600
| +131% | +$74.1K |
2022 Q3
14 quarters
|
|
5589
CALL
BOK Financial
BOKF
$7.8B
| $64K | ﹤0.01% |
+500
| New | +$64.2K |
2026 Q1
0 quarters
|
|
5590
PUT
PagerDuty
PD
$1.21B
| $64K | ﹤0.01% |
10,300
-2,000
| -16% | -$17.3K |
2019 Q2
27 quarters
|
|
5591
PUT
Columbus McKinnon
CMCO
$483M
| $63.9K | ﹤0.01% |
+4,400
| New | +$82K |
2026 Q1
0 quarters
|
|
5592
PUT
Seres Therapeutics
MCRB
$29.5M
| $63.9K | ﹤0.01% |
7,200
-2,500
| -26% | -$29.3K |
2020 Q2
23 quarters
|
|
5593
PUT
Vontier
VNT
$4.28B
| $63.8K | ﹤0.01% |
+1,800
| New | +$69.3K |
2026 Q1
0 quarters
|
|
5594
iShares US Treasury Bond ETF
GOVT
$41.2B
| $63.7K | ﹤0.01% |
2,782
-2,486
| -47% | -$57.3K |
2025 Q4
1 quarter
|
|
5595
MediaAlpha
MAX
$510M
| $63.7K | ﹤0.01% |
6,846
+2,971
| +77% | +$29.3K |
2023 Q2
11 quarters
|
|
5596
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$10.7B
| $63.6K | ﹤0.01% |
2,420
-20,516
| -89% | -$547K |
2025 Q3
2 quarters
|
|
|
CCC
5597
CALL
CCC Intelligent Solutions
CCC
$3.86B
| $63.6K | ﹤0.01% |
+10,600
| New | +$69.4K |
2026 Q1
0 quarters
|
|
5598
PUT
Vitesse Energy
VTS
$710M
| $63.6K | ﹤0.01% |
3,500
-6,100
| -64% | -$123K |
2023 Q2
11 quarters
|
|
5599
CALL
SharkNinja
SN
$25.7B
| $63.5K | ﹤0.01% |
600
-38,200
| -98% | -$4.47M |
2023 Q4
9 quarters
|
|
|
SEM
5600
PUT
DELISTED
Select Medical
SEM
| $63.5K | ﹤0.01% |
3,900
+200
| +5% | +$3.13K |
2025 Q3
2 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.