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 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
626
CALL
Ciena
CIEN
$50.6B
| $13.3M | 0.01% |
27,100
-3,200
| -11% | -$1.63M |
|
627
PUT
Sea Limited
SE
$61B
| $13.2M | 0.01% |
137,800
+12,500
| +10% | +$1.1M |
|
628
CALL
Madrigal Pharmaceuticals
MDGL
$11.9B
| $13.2M | 0.01% |
24,500
-4,700
| -16% | -$2.41M |
|
629
Direxion Daily 20+ Year Treasury Bull 3X ETF
TMF
$1.98B
| $13.1M | 0.01% |
369,781
+196,769
| +114% | +$6.94M |
|
630
CALL
Constellation Brands
STZ
$19.4B
| $13.1M | 0.01% |
94,500
-4,800
| -5% | -$714K |
|
631
CALL
TJX Companies
TJX
$143B
| $13.1M | 0.01% |
86,500
+4,200
| +5% | +$664K |
|
632
PUT
Direxion Daily MSCI Emerging Markets Bear 3X ETF
EDZ
$20.4M
| $13.1M | 0.01% |
3,817,000
+1,910,400
| +100% | +$36M |
|
633
CALL
Danaher
DHR
$158B
| $13M | 0.01% |
68,500
-600
| -0.9% | -$109K |
|
634
CALL
MaxLinear
MXL
$8.51B
| $13M | 0.01% |
101,900
+96,300
| +1,720% | +$6.81M |
|
|
USAR
635
PUT
USA Rare Earth Inc
USAR
$5.7B
| $13M | 0.01% |
600,800
+406,100
| +209% | +$9.26M |
|
636
PUT
Lumen
LUMN
$5.89B
| $12.9M | 0.01% |
1,684,400
+307,400
| +22% | +$2.7M |
|
637
CALL
Samsara
IOT
$22.2B
| $12.9M | 0.01% |
396,700
+175,800
| +80% | +$5.44M |
|
638
PUT
Fair Isaac
FICO
$18.6B
| $12.8M | 0.01% |
10,700
-20,600
| -66% | -$23.1M |
|
639
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$746M
| $12.8M | 0.01% |
211,200
+73,000
| +53% | +$1.37M |
|
640
CALL
Cadence Design Systems
CDNS
$89.8B
| $12.7M | 0.01% |
33,900
| – | – |
|
641
PUT
Global Payments
GPN
$22.9B
| $12.6M | 0.01% |
174,300
+150,300
| +626% | +$10.3M |
|
642
CALL
General Motors
GM
$72.5B
| $12.6M | 0.01% |
163,400
-172,500
| -51% | -$13.6M |
|
643
CALL
Hecla Mining
HL
$12.2B
| $12.6M | 0.01% |
816,200
+155,200
| +23% | +$2.73M |
|
|
HUT
644
Hut 8
HUT
$11.9B
| $12.6M | 0.01% |
+109,022
| New | +$10.6M |
|
645
Global X Uranium ETF
URA
$5.74B
| $12.6M | 0.01% |
287,766
-182,338
| -39% | -$9.24M |
|
646
CALL
CleanSpark
CLSK
$3.58B
| $12.5M | 0.01% |
858,800
-563,500
| -40% | -$7.95M |
|
647
Lowe's Companies
LOW
$106B
| $12.5M | 0.01% |
56,496
+53,509
| +1,791% | +$12.2M |
|
648
CALL
Transocean
RIG
$6.01B
| $12.4M | 0.01% |
2,542,100
+117,900
| +5% | +$737K |
|
649
CALL
Estee Lauder
EL
$34.2B
| $12.4M | 0.01% |
157,100
+2,100
| +1% | +$170K |
|
650
PUT
Eaton
ETN
$171B
| $12.4M | 0.01% |
29,100
-14,200
| -33% | -$5.73M |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.