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 | Held Since | |
|---|---|---|---|---|---|---|---|
8126
PUT
Baldwin Insurance Group
BWIN
$4.49B
| $5.32K | ﹤0.01% |
200
-7,400
| -97% | -$160K |
2026 Q1
1 quarter
|
|
8127
PUT
Orion
OEC
$305M
| $5.3K | ﹤0.01% |
800
-600
| -43% | -$4.32K |
2025 Q4
2 quarters
|
|
8128
CALL
DELISTED
Open Lending Corp
LPRO
| $5.29K | ﹤0.01% |
+1,700
| New | +$3.47K |
2026 Q2
0 quarters
|
|
8129
T-REX 2X Long KTOS Daily Target ETF
KTUP
$5.2M
| $5.28K | ﹤0.01% |
+818
| New | +$8.78K |
2026 Q2
0 quarters
|
|
8130
T-REX 2X Long EOSE Daily Target ETF
EOSU
$1.02M
| $5.28K | ﹤0.01% |
233
+231
| +11,550% | +$8.81K |
2026 Q1
1 quarter
|
|
8131
PUT
Flywire
FLYW
$2.37B
| $5.27K | ﹤0.01% |
300
-18,000
| -98% | -$266K |
2023 Q2
12 quarters
|
|
8132
PUT
Carlyle Secured Lending
CGBD
$707M
| $5.26K | ﹤0.01% |
500
-100
| -17% | -$1.11K |
2022 Q1
17 quarters
|
|
8133
CALL
VolitionRx Ltd
VNRX
$5.08M
| $5.26K | ﹤0.01% |
+3,900
| New | +$9.41K |
2026 Q2
0 quarters
|
|
8134
Materialise
MTLS
$491M
| $5.26K | ﹤0.01% |
708
-922
| -57% | -$5.46K |
2025 Q3
3 quarters
|
|
8135
CALL
Dolby
DLB
$5.93B
| $5.26K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8136
PUT
Fathom Holdings
FTHM
$6.35M
| $5.25K | ﹤0.01% |
5,200
+1,000
| +24% | +$783 |
2025 Q3
3 quarters
|
|
8137
FingerMotion
FNGR
$11.9M
| $5.24K | ﹤0.01% |
+13,874
| New | +$11.1K |
2026 Q2
0 quarters
|
|
8138
BCP Investment Corp
BCIC
$74.9M
| $5.23K | ﹤0.01% |
719
-1,545
| -68% | -$11.8K |
2025 Q4
2 quarters
|
|
8139
CALL
Horizon Technology Finance
HRZN
$268M
| $5.2K | ﹤0.01% |
1,100
-10,400
| -90% | -$45K |
2025 Q2
4 quarters
|
|
8140
VanEck Solana ETF
VSOL
$18.5M
| $5.2K | ﹤0.01% |
+529
| New | +$5.66K |
2026 Q2
0 quarters
|
|
8141
ROBO Global Artificial Intelligence ETF
THNQ
$460M
| $5.2K | ﹤0.01% |
+57
| New | +$4.46K |
2026 Q2
0 quarters
|
|
8142
PUT
SLM Corp
SLM
$4.09B
| $5.19K | ﹤0.01% |
200
-400
| -67% | -$9.01K |
2021 Q2
20 quarters
|
|
8143
CALL
KT
KT
$8.26B
| $5.18K | ﹤0.01% |
+300
| New | +$5.98K |
2026 Q2
0 quarters
|
|
|
8144
PUT
KT
KT
$8.26B
| $5.18K | ﹤0.01% |
+300
| New | +$5.98K |
2026 Q2
0 quarters
|
|
8145
PUT
Sprinklr
CXM
$1.55B
| $5.16K | ﹤0.01% |
1,000
-1,000
| -50% | -$5.32K |
2021 Q4
18 quarters
|
|
8146
PUT
Delek Logistics
DKL
$3.29B
| $5.15K | ﹤0.01% |
+100
| New | +$5.09K |
2026 Q2
0 quarters
|
|
8147
PUT
Evolution Petroleum
EPM
$151M
| $5.15K | ﹤0.01% |
+1,400
| New | +$6.12K |
2026 Q2
0 quarters
|
|
8148
Armata Pharmaceuticals
ARMP
$128M
| $5.14K | ﹤0.01% |
+794
| New | +$7.28K |
2026 Q2
0 quarters
|
|
8149
PUT
Phreesia
PHR
$790M
| $5.14K | ﹤0.01% |
500
-3,700
| -88% | -$34.4K |
2023 Q2
12 quarters
|
|
8150
Defiance Daily Target 2x Long MSTR ETF
MSTX
$316M
| $5.14K | ﹤0.01% |
+691
| New | +$17.4K |
2026 Q2
0 quarters
|
|
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.