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 | |
|---|---|---|---|---|---|---|
6326
CALL
Jack Henry & Associates
JKHY
$10.9B
| $31.6K | ﹤0.01% |
200
-1,000
| -83% | -$171K |
|
6327
Installed Building Products
IBP
$6.04B
| $31.6K | ﹤0.01% |
+119
| New | +$35.6K |
|
|
MSB
6328
CALL
Mesabi Trust
MSB
$314M
| $31.5K | ﹤0.01% |
1,000
-1,500
| -60% | -$51.1K |
|
6329
Dream Finders Homes
DFH
$1.36B
| $31.5K | ﹤0.01% |
2,262
+684
| +43% | +$12.2K |
|
6330
Lantronix
LTRX
$237M
| $31.5K | ﹤0.01% |
6,008
-29,855
| -83% | -$183K |
|
6331
PUT
Genius Sports
GENI
$1.8B
| $31.5K | ﹤0.01% |
7,100
-31,100
| -81% | -$221K |
|
6332
PUT
Adtran
ADTN
$983M
| $31.4K | ﹤0.01% |
2,500
-3,600
| -59% | -$36.5K |
|
6333
Dyne Therapeutics
DYN
$3.94B
| $31.4K | ﹤0.01% |
1,734
-7,452
| -81% | -$129K |
|
6334
PUT
St. Joe Company
JOE
$3.46B
| $31.4K | ﹤0.01% |
500
-600
| -55% | -$40.2K |
|
6335
Denison Mines
DNN
$2.71B
| $31.4K | ﹤0.01% |
+8,882
| New | +$33.4K |
|
6336
KraneShares California Carbon Allowance Strategy ETF
KCCA
$116M
| $31.3K | ﹤0.01% |
2,114
+1,209
| +134% | +$18.8K |
|
6337
Merchants Bancorp
MBIN
$2.25B
| $31.3K | ﹤0.01% |
730
+388
| +113% | +$15.8K |
|
6338
Avista
AVA
$3.43B
| $31.3K | ﹤0.01% |
780
-1,816
| -70% | -$73.3K |
|
|
TBI
6339
Trueblue
TBI
$261M
| $31.3K | ﹤0.01% |
7,996
-3,022
| -27% | -$13.4K |
|
6340
CALL
Cullinan Oncology
CGEM
$1.11B
| $31.3K | ﹤0.01% |
2,200
-16,500
| -88% | -$212K |
|
|
WBTN
6341
CALL
WEBTOON Entertainment Inc
WBTN
$1.33B
| $31.2K | ﹤0.01% |
3,400
-900
| -21% | -$10.1K |
|
|
BNCWW
6342
CALL
CEA Industries Inc Warrant
BNCWW
$44.7K
| $31.2K | ﹤0.01% |
10,700
-22,300
| -68% | -$1.04K |
|
|
SJT
6343
San Juan Basin Royalty Trust
SJT
$126M
| $31.2K | ﹤0.01% |
6,491
-4,041
| -38% | -$22.1K |
|
6344
iShares Asia 50 ETF
AIA
$4.7B
| $31.2K | ﹤0.01% |
+294
| New | +$32.1K |
|
|
MTA
6345
Metalla Royalty & Streaming
MTA
$675M
| $31.2K | ﹤0.01% |
4,704
-14,851
| -76% | -$117K |
|
6346
Beam Therapeutics
BEAM
$2.81B
| $31.2K | ﹤0.01% |
1,308
-7,494
| -85% | -$208K |
|
|
CYPH
6347
Cypherpunk Technologies Inc
CYPH
$78.7M
| $31.2K | ﹤0.01% |
39,196
-28,622
| -42% | -$22.1K |
|
6348
Cato Corp
CATO
$65.9M
| $31.1K | ﹤0.01% |
10,999
-5,963
| -35% | -$18.4K |
|
6349
CALL
ADC Therapeutics
ADCT
$162M
| $31.1K | ﹤0.01% |
8,300
+7,700
| +1,283% | +$30.4K |
|
6350
PUT
Leidos
LDOS
$13.5B
| $31.1K | ﹤0.01% |
200
-100
| -33% | -$18K |
|
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.