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 | |
|---|---|---|---|---|---|---|
726
CALL
United States Natural Gas Fund
UNG
$639M
| $10.5M | 0.01% |
899,800
-122,100
| -12% | -$1.37M |
|
727
PUT
The Mosaic Company
MOS
$7.31B
| $10.5M | 0.01% |
494,200
+13,700
| +3% | +$317K |
|
728
CALL
Affirm
AFRM
$24.1B
| $10.5M | 0.01% |
128,400
-152,900
| -54% | -$9.99M |
|
729
CALL
Travelers Companies
TRV
$75.7B
| $10.5M | 0.01% |
31,700
+24,100
| +317% | +$7.3M |
|
730
CALL
Revolution Medicines
RVMD
$43.9B
| $10.5M | 0.01% |
55,800
+6,900
| +14% | +$1.01M |
|
731
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$712M
| $10.4M | 0.01% |
152,100
-8,900
| -6% | -$484K |
|
732
Costco
COST
$409B
| $10.4M | 0.01% |
+11,161
| New | +$11.1M |
|
733
PUT
UiPath
PATH
$6.49B
| $10.4M | 0.01% |
960,500
+270,300
| +39% | +$2.89M |
|
734
State Street SPDR S&P Regional Banking ETF
KRE
$3.81B
| $10.4M | 0.01% |
+139,288
| New | +$9.75M |
|
735
PUT
Enphase Energy
ENPH
$4.28B
| $10.4M | 0.01% |
211,700
-45,900
| -18% | -$2.09M |
|
736
CALL
Johnson Controls International
JCI
$91B
| $10.4M | 0.01% |
71,300
-6,700
| -9% | -$946K |
|
737
CALL
Vertex Pharmaceuticals
VRTX
$133B
| $10.4M | 0.01% |
20,900
-18,100
| -46% | -$8.02M |
|
738
CALL
Humana
HUM
$47.8B
| $10.4M | 0.01% |
26,100
-7,800
| -23% | -$2.22M |
|
739
PUT
Planet Labs
PL
$6.34B
| $10.4M | 0.01% |
312,500
-316,600
| -50% | -$11.7M |
|
740
PUT
Amphenol
APH
$207B
| $10.3M | 0.01% |
117,200
-97,400
| -45% | -$7.02M |
|
741
CALL
Amkor Technology
AMKR
$13.3B
| $10.3M | 0.01% |
119,700
+25,600
| +27% | +$1.82M |
|
742
PUT
Valero Energy
VLO
$111B
| $10.3M | 0.01% |
39,600
-13,300
| -25% | -$3.27M |
|
743
CALL
abrdn Physical Gold Shares ETF
SGOL
$7.17B
| $10.3M | 0.01% |
269,500
+258,000
| +2,243% | +$11.1M |
|
744
CALL
Lyft
LYFT
$5.63B
| $10.3M | 0.01% |
704,100
-173,600
| -20% | -$2.43M |
|
|
SNDK
745
Sandisk
SNDK
$260B
| $10.3M | 0.01% |
4,518
+2,960
| +190% | +$4.23M |
|
746
CALL
Welltower
WELL
$167B
| $10.3M | 0.01% |
45,200
+21,000
| +87% | +$4.44M |
|
747
CALL
AGNC Investment
AGNC
$11.4B
| $10.2M | 0.01% |
935,800
-28,800
| -3% | -$303K |
|
748
CALL
Cummins
CMI
$72.3B
| $10.2M | 0.01% |
14,300
+3,200
| +29% | +$2.11M |
|
749
CALL
Rubrik
RBRK
$22.7B
| $10.2M | 0.01% |
126,600
+22,000
| +21% | +$1.38M |
|
750
CALL
General Mills
GIS
$18B
| $10.2M | 0.01% |
292,000
+95,500
| +49% | +$3.3M |
|
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.