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 | |
|---|---|---|---|---|---|---|---|
4401
RadNet
RDNT
$5.33B
| $184K | ﹤0.01% |
3,284
-4,265
| -56% | -$291K |
2025 Q4
1 quarter
|
|
4402
US Global GO Gold and Precious Metal Miners ETF
GOAU
$189M
| $183K | ﹤0.01% |
4,136
+2,216
| +115% | +$107K |
2025 Q2
3 quarters
|
|
4403
Stagwell
STGW
$2.07B
| $183K | ﹤0.01% |
29,150
+29,050
| +29,050% | +$162K |
2025 Q3
2 quarters
|
|
4404
PUT
Fortune Brands Innovations
FBIN
$4.6B
| $183K | ﹤0.01% |
+4,700
| New | +$244K |
2026 Q1
0 quarters
|
|
4405
CALL
Pentair
PNR
$8.44B
| $183K | ﹤0.01% |
2,100
-1,500
| -42% | -$147K |
2018 Q2
31 quarters
|
|
4406
CALL
Paymentus
PAY
$3.88B
| $183K | ﹤0.01% |
7,200
+6,600
| +1,100% | +$174K |
2021 Q4
17 quarters
|
|
4407
PUT
Dime Commercial Bancshares
DCOM
$1.75B
| $183K | ﹤0.01% |
+5,400
| New | +$177K |
2026 Q1
0 quarters
|
|
|
MOMO
4408
PUT
Hello Group
MOMO
$692M
| $183K | ﹤0.01% |
31,700
+3,100
| +11% | +$20.1K |
2015 Q2
43 quarters
|
|
|
OS
4409
PUT
DELISTED
OneStream Inc
OS
| $182K | ﹤0.01% |
7,600
-35,500
| -82% | -$833K |
2025 Q1
4 quarters
|
|
4410
PUT
Relmada Therapeutics
RLMD
$390M
| $182K | ﹤0.01% |
+26,200
| New | +$124K |
2026 Q1
0 quarters
|
|
4411
CALL
Rackspace Technology
RXT
$984M
| $182K | ﹤0.01% |
185,300
+144,700
| +356% | +$176K |
2020 Q3
22 quarters
|
|
4412
PUT
Morgan Stanley Direct Lending Fund
MSDL
$1.15B
| $181K | ﹤0.01% |
+13,000
| New | +$201K |
2026 Q1
0 quarters
|
|
4413
CALL
Radiant Logistics
RLGT
$423M
| $181K | ﹤0.01% |
25,700
+21,400
| +498% | +$150K |
2025 Q2
3 quarters
|
|
4414
Pilgrim's Pride
PPC
$6B
| $181K | ﹤0.01% |
+4,795
| New | +$193K |
2026 Q1
0 quarters
|
|
|
SY
4415
PUT
So-Young International
SY
$272M
| $181K | ﹤0.01% |
66,300
-32,700
| -33% | -$97.8K |
2025 Q3
2 quarters
|
|
4416
CALL
Archrock
AROC
$5.33B
| $181K | ﹤0.01% |
5,200
+2,500
| +93% | +$79.8K |
2018 Q2
31 quarters
|
|
|
SKYT
4417
PUT
DELISTED
SkyWater Technology
SKYT
| $181K | ﹤0.01% |
6,600
+3,100
| +89% | +$91.1K |
2021 Q4
17 quarters
|
|
4418
CALL
Broadstone Net Lease
BNL
$3.5B
| $181K | ﹤0.01% |
9,900
-23,300
| -70% | -$439K |
2021 Q1
20 quarters
|
|
4419
PUT
Philips
PHG
$23.3B
| $181K | ﹤0.01% |
6,845
-15,350
| -69% | -$434K |
2017 Q4
33 quarters
|
|
4420
PUT
VinFast Auto
VFS
$7.16B
| $181K | ﹤0.01% |
46,900
-294,500
| -86% | -$964K |
2023 Q3
10 quarters
|
|
4421
PUT
Kyverna Therapeutics
KYTX
$403M
| $180K | ﹤0.01% |
20,900
+900
| +5% | +$7.5K |
2025 Q4
1 quarter
|
|
4422
PUT
Principal Financial Group
PFG
$24B
| $180K | ﹤0.01% |
+2,000
| New | +$183K |
2026 Q1
0 quarters
|
|
4423
CALL
Eversource Energy
ES
$24.2B
| $180K | ﹤0.01% |
2,600
-10,100
| -80% | -$714K |
2018 Q2
31 quarters
|
|
4424
YieldMax TSLA Option Income Strategy ETF
TSLY
$656M
| $180K | ﹤0.01% |
6,005
-2,329
| -28% | -$78.1K |
2025 Q4
1 quarter
|
|
4425
PUT
Equifax
EFX
$16.4B
| $180K | ﹤0.01% |
1,000
-4,900
| -83% | -$973K |
2015 Q3
42 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.