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 | |
|---|---|---|---|---|---|---|---|
4701
Arcturus Therapeutics
ARCT
$367M
| $140K | ﹤0.01% |
+18,166
| New | +$133K |
2026 Q1
0 quarters
|
|
|
OFRM
4702
Once Upon a Farm PBC
OFRM
$680M
| $140K | ﹤0.01% |
+8,575
| New | +$176K |
2026 Q1
0 quarters
|
|
4703
PUT
Lazard
LAZ
$3.54B
| $140K | ﹤0.01% |
3,300
-1,500
| -31% | -$73.4K |
2015 Q3
42 quarters
|
|
4704
NEOS S&P 500 High Income ETF
SPYI
$12.3B
| $140K | ﹤0.01% |
+2,839
| New | +$147K |
2026 Q1
0 quarters
|
|
|
SOGP
4705
PUT
Sound Group
SOGP
$46.5M
| $140K | ﹤0.01% |
8,300
-27,400
| -77% | -$380K |
2025 Q3
2 quarters
|
|
4706
CALL
Textron
TXT
$13.3B
| $140K | ﹤0.01% |
1,600
-4,700
| -75% | -$439K |
2014 Q4
45 quarters
|
|
|
4707
PUT
Textron
TXT
$13.3B
| $140K | ﹤0.01% |
1,600
+1,300
| +433% | +$121K |
2016 Q1
40 quarters
|
|
4708
PUT
Perma-Fix Environmental Services
PESI
$328M
| $140K | ﹤0.01% |
+13,100
| New | +$180K |
2026 Q1
0 quarters
|
|
4709
PUT
Kodiak Gas Services
KGS
$5.65B
| $140K | ﹤0.01% |
2,400
-45,600
| -95% | -$2.21M |
2025 Q2
3 quarters
|
|
4710
Tradeweb Markets
TW
$21.9B
| $140K | ﹤0.01% |
1,187
-1,637
| -58% | -$187K |
2025 Q3
2 quarters
|
|
4711
PUT
CBIZ
CBZ
$3.01B
| $140K | ﹤0.01% |
5,200
+1,700
| +49% | +$60K |
2025 Q4
1 quarter
|
|
4712
CALL
Clearwater Paper
CLW
$313M
| $139K | ﹤0.01% |
9,700
| – | – |
2023 Q2
11 quarters
|
|
4713
PUT
Urban Outfitters
URBN
$6.92B
| $139K | ﹤0.01% |
2,200
-26,500
| -92% | -$1.82M |
2021 Q1
20 quarters
|
|
4714
PUT
Lamar Advertising Co
LAMR
$14.8B
| $139K | ﹤0.01% |
1,100
+300
| +38% | +$39.3K |
2025 Q3
2 quarters
|
|
4715
Abeona Therapeutics
ABEO
$290M
| $139K | ﹤0.01% |
31,096
-67,142
| -68% | -$336K |
2025 Q2
3 quarters
|
|
|
ACR
4716
PUT
ACRES Commercial Realty
ACR
$169M
| $139K | ﹤0.01% |
+7,200
| New | +$138K |
2026 Q1
0 quarters
|
|
4717
CALL
Build-A-Bear
BBW
$311M
| $139K | ﹤0.01% |
3,700
-7,900
| -68% | -$416K |
2019 Q4
25 quarters
|
|
4718
PUT
Sinclair Inc
SBGI
$901M
| $138K | ﹤0.01% |
10,700
+8,900
| +494% | +$129K |
2015 Q3
42 quarters
|
|
4719
CALL
Ryman Hospitality Properties
RHP
$8.41B
| $138K | ﹤0.01% |
1,500
+1,200
| +400% | +$115K |
2024 Q4
5 quarters
|
|
4720
CALL
UGI
UGI
$7.99B
| $138K | ﹤0.01% |
3,800
-1,700
| -31% | -$64K |
2018 Q2
31 quarters
|
|
4721
CALL
SiTime
SITM
$21.6B
| $138K | ﹤0.01% |
400
-100
| -20% | -$36.8K |
2021 Q4
17 quarters
|
|
4722
Cannae Holdings
CNNE
$669M
| $138K | ﹤0.01% |
+12,145
| New | +$163K |
2026 Q1
0 quarters
|
|
4723
CALL
A2Z Smart Technologies
AZ
$258M
| $138K | ﹤0.01% |
+20,700
| New | +$132K |
2026 Q1
0 quarters
|
|
|
KWY
4724
PUT
Kingsway Corp
KWY
$275M
| $138K | ﹤0.01% |
13,200
+11,800
| +843% | +$143K |
2025 Q2
3 quarters
|
|
4725
PUT
Acumen Pharmaceuticals
ABOS
$147M
| $138K | ﹤0.01% |
+58,300
| New | +$149K |
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.