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 | |
|---|---|---|---|---|---|---|
|
FRMI
1176
PUT
Fermi Inc
FRMI
$2.89B
| $5.25M | ﹤0.01% |
572,700
+262,100
| +84% | +$1.66M |
|
1177
ProShares UltraShort Gold
GLL
$86.4M
| $5.24M | ﹤0.01% |
194,290
+31,435
| +19% | +$685K |
|
|
TE
1178
CALL
T1 Energy
TE
$1.11B
| $5.23M | ﹤0.01% |
551,900
+31,000
| +6% | +$220K |
|
1179
PUT
Lattice Semiconductor
LSCC
$18.2B
| $5.23M | ﹤0.01% |
34,200
+30,900
| +936% | +$3.99M |
|
|
IPFF
1180
PUT
DELISTED
iShares International Preferred Stock ETF
IPFF
| $5.23M | ﹤0.01% |
106,200
-104,400
| -50% | -$5.14M |
|
1181
CALL
C.H. Robinson
CHRW
$17.2B
| $5.22M | ﹤0.01% |
27,700
-22,900
| -45% | -$4.07M |
|
1182
PUT
GSK
GSK
$98.7B
| $5.22M | ﹤0.01% |
99,500
-58,100
| -37% | -$3.07M |
|
1183
TPG
TPG
$7.4B
| $5.21M | ﹤0.01% |
128,520
+67,098
| +109% | +$2.82M |
|
1184
CALL
Carlyle Group
CG
$14.3B
| $5.2M | ﹤0.01% |
123,600
-80,300
| -39% | -$3.77M |
|
1185
PUT
SL Green Realty
SLG
$3.61B
| $5.2M | ﹤0.01% |
100,400
+75,800
| +308% | +$3.38M |
|
1186
CALL
Prudential Financial
PRU
$41.2B
| $5.19M | ﹤0.01% |
48,100
+2,800
| +6% | +$285K |
|
1187
CALL
SEALSQ Corp
LAES
$529M
| $5.18M | ﹤0.01% |
1,644,800
-247,800
| -13% | -$739K |
|
1188
CALL
D.R. Horton
DHI
$39.6B
| $5.18M | ﹤0.01% |
31,800
-17,600
| -36% | -$2.63M |
|
1189
PUT
Truist Financial
TFC
$58.2B
| $5.16M | ﹤0.01% |
103,600
-58,600
| -36% | -$2.88M |
|
1190
PUT
Deutsche Bank
DB
$68.7B
| $5.15M | ﹤0.01% |
152,600
+9,700
| +7% | +$314K |
|
1191
PUT
Ionis Pharmaceuticals
IONS
$7.4B
| $5.15M | ﹤0.01% |
64,900
+1,000
| +2% | +$75.3K |
|
|
MPT
1192
PUT
Medical Properties Trust
MPT
$2.13B
| $5.13M | ﹤0.01% |
1,110,500
-221,100
| -17% | -$1.1M |
|
1193
CALL
PagSeguro Digital
PAGS
$2.49B
| $5.13M | ﹤0.01% |
566,800
+345,100
| +156% | +$3.34M |
|
1194
CALL
Hilton Worldwide
HLT
$70.7B
| $5.12M | ﹤0.01% |
15,500
+2,600
| +20% | +$854K |
|
1195
CALL
argenx
ARGX
$60B
| $5.1M | ﹤0.01% |
5,500
-1,800
| -25% | -$1.48M |
|
|
1196
CALL
GSK
GSK
$98.7B
| $5.1M | ﹤0.01% |
97,300
-4,700
| -5% | -$249K |
|
1197
CALL
L3Harris
LHX
$44.3B
| $5.09M | ﹤0.01% |
17,500
-3,200
| -15% | -$1.02M |
|
1198
Palo Alto Networks
PANW
$307B
| $5.08M | ﹤0.01% |
14,905
+12,241
| +459% | +$2.8M |
|
1199
uniQure
QURE
$2.65B
| $5.08M | ﹤0.01% |
110,219
-121,550
| -52% | -$3.18M |
|
1200
Erasca
ERAS
$4.98B
| $5.07M | ﹤0.01% |
276,988
+24,241
| +10% | +$347K |
|
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.