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 | Technology | 0.62% |
| 2 | Communication Services | 0.22% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6201
CALL
Vishay Intertechnology
VSH
$6.17B
| $36K | ﹤0.01% |
2,000
-2,900
| -59% | -$52.7K |
|
6202
PUT
Xeris Biopharma Holdings
XERS
$1.45B
| $36K | ﹤0.01% |
+6,200
| New | +$41.1K |
|
6203
CALL
Marqeta
MQ
$1.8B
| $35.9K | ﹤0.01% |
2,200
-25,775
| -92% | -$434K |
|
6204
PUT
Park Hotels & Resorts
PK
$3.04B
| $35.8K | ﹤0.01% |
3,400
-7,900
| -70% | -$87.2K |
|
6205
PUT
SEACOR Marine Holdings
SMHI
$209M
| $35.8K | ﹤0.01% |
5,000
| – | – |
|
6206
PUT
Horizon Technology Finance
HRZN
$307M
| $35.8K | ﹤0.01% |
8,500
+3,800
| +81% | +$22K |
|
|
API
6207
CALL
Agora
API
$328M
| $35.8K | ﹤0.01% |
10,100
+9,900
| +4,950% | +$42K |
|
|
MST
6208
Defiance Leveraged Long Income MSTR ETF
MST
$13.8M
| $35.7K | ﹤0.01% |
+1,738
| New | +$54.1K |
|
6209
PUT
Columbia Banking Systems
COLB
$9.45B
| $35.7K | ﹤0.01% |
1,300
-2,100
| -62% | -$60.7K |
|
6210
PUT
Leonardo DRS
DRS
$12.3B
| $35.6K | ﹤0.01% |
800
-5,400
| -87% | -$228K |
|
|
GLNK
6211
Grayscale Chainlink Trust ETF
GLNK
$79.8M
| $35.6K | ﹤0.01% |
4,580
-7,737
| -63% | -$70.2K |
|
6212
POSCO
PKX
$15.7B
| $35.6K | ﹤0.01% |
+608
| New | +$36.9K |
|
6213
Clarus
CLAR
$128M
| $35.5K | ﹤0.01% |
13,069
+6,394
| +96% | +$21K |
|
6214
Savers
SVV
$1.48B
| $35.5K | ﹤0.01% |
4,769
-28,949
| -86% | -$277K |
|
6215
CALL
Compass Therapeutics
CMPX
$362M
| $35.4K | ﹤0.01% |
6,700
+6,500
| +3,250% | +$37.5K |
|
6216
PUT
Atlas Energy Solutions
AESI
$1.85B
| $35.4K | ﹤0.01% |
2,700
-1,400
| -34% | -$16.4K |
|
6217
CALL
KORU Medical Systems
KRMD
$177M
| $35.4K | ﹤0.01% |
8,200
+400
| +5% | +$1.98K |
|
|
ECG
6218
Everus Construction Group
ECG
$6.98B
| $35.4K | ﹤0.01% |
+300
| New | +$31K |
|
6219
CALL
Embecta
EMBC
$193M
| $35.4K | ﹤0.01% |
4,000
-6,200
| -61% | -$64.6K |
|
6220
CALL
Westlake Chemical Partners
WLKP
$777M
| $35.3K | ﹤0.01% |
1,600
-2,500
| -61% | -$53.7K |
|
6221
CALL
Covenant Logistics
CVLG
$1.24B
| $35.3K | ﹤0.01% |
+1,300
| New | +$34.9K |
|
6222
PUT
Mercury Insurance
MCY
$5.68B
| $35.3K | ﹤0.01% |
+400
| New | +$35.8K |
|
6223
Arena Group
AREN
$49M
| $35.2K | ﹤0.01% |
+16,237
| New | +$54K |
|
6224
PUT
Aspen Aerogels
ASPN
$442M
| $35.2K | ﹤0.01% |
10,300
+100
| +1% | +$337 |
|
6225
PUT
Phreesia
PHR
$618M
| $35.2K | ﹤0.01% |
4,200
-900
| -18% | -$11.9K |
|
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 withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amazon worth $159M.
- 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 2,156 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.