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 | |
|---|---|---|---|---|---|---|---|
8376
KT
KT
$8.3B
| $3.4K | ﹤0.01% |
+197
| New | +$3.93K |
2026 Q2
0 quarters
|
|
8377
PUT
Hamilton Insurance Group
HG
$3.65B
| $3.39K | ﹤0.01% |
100
-4,800
| -98% | -$151K |
2026 Q1
1 quarter
|
|
8378
CALL
El Pollo Loco
LOCO
$453M
| $3.39K | ﹤0.01% |
+200
| New | +$2.86K |
2026 Q2
0 quarters
|
|
8379
CALL
Fox Factory Holding Corp
FOXF
$631M
| $3.39K | ﹤0.01% |
+200
| New | +$3.48K |
2026 Q2
0 quarters
|
|
8380
VanEck Brazil Small-Cap ETF
BRF
$26.6M
| $3.37K | ﹤0.01% |
+205
| New | +$3.7K |
2026 Q2
0 quarters
|
|
8381
PUT
Worthington Steel
WS
$2.02B
| $3.36K | ﹤0.01% |
+100
| New | +$3.83K |
2026 Q2
0 quarters
|
|
8382
Xtrackers MSCI EAFE High Dividend Yield Equity ETF
HDEF
$2.35B
| $3.34K | ﹤0.01% |
104
-30
| -22% | -$981 |
2025 Q4
2 quarters
|
|
8383
CALL
Connect Biopharma Holdings
CNTB
$46.9M
| $3.33K | ﹤0.01% |
1,400
-1,900
| -58% | -$4.61K |
2025 Q4
2 quarters
|
|
8384
PUT
Seacoast Banking Corp of Florida
SBCF
$3.25B
| $3.32K | ﹤0.01% |
+100
| New | +$3.12K |
2026 Q2
0 quarters
|
|
8385
CALL
Sutro Biopharma
STRO
$170M
| $3.32K | ﹤0.01% |
+100
| New | +$3.12K |
2026 Q2
0 quarters
|
|
8386
D-Market Electronic Services & Trading
HEPS
$1.18B
| $3.31K | ﹤0.01% |
+1,138
| New | +$3.15K |
2026 Q2
0 quarters
|
|
8387
State Street SPDR Nuveen ICE Short Term Municipal Bond ETF
SHM
$3.51B
| $3.31K | ﹤0.01% |
+69
| New | +$3.3K |
2026 Q2
0 quarters
|
|
8388
CALL
Xperi
XPER
$252M
| $3.29K | ﹤0.01% |
+400
| New | +$2.9K |
2026 Q2
0 quarters
|
|
8389
CALL
BayCom
BCML
$349M
| $3.29K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
|
8390
PUT
BayCom
BCML
$349M
| $3.29K | ﹤0.01% |
100
-400
| -80% | -$12.2K |
2026 Q1
1 quarter
|
|
8391
CALL
Standard BioTools
LAB
$257M
| $3.29K | ﹤0.01% |
+4,000
| New | +$3.78K |
2026 Q2
0 quarters
|
|
8392
iShares Convertible Bond ETF
ICVT
$7.59B
| $3.29K | ﹤0.01% |
27
-73
| -73% | -$8.46K |
2026 Q1
1 quarter
|
|
8393
Rexford Industrial Realty
REXR
$8.04B
| $3.28K | ﹤0.01% |
+98
| New | +$3.43K |
2026 Q2
0 quarters
|
|
8394
Dimensional World ex US Core Equity 2 ETF
DFAX
$12B
| $3.28K | ﹤0.01% |
89
+32
| +56% | +$1.18K |
2026 Q1
1 quarter
|
|
|
IMMP
8395
Immutep
IMMP
$23.1M
| $3.27K | ﹤0.01% |
+393
| New | +$3.42K |
2026 Q2
0 quarters
|
|
8396
HUTCHMED
HCM
$2.48B
| $3.27K | ﹤0.01% |
304
-202
| -40% | -$2.55K |
2024 Q4
6 quarters
|
|
8397
PUT
Yext
YEXT
$715M
| $3.27K | ﹤0.01% |
700
-109,300
| -99% | -$424K |
2025 Q1
5 quarters
|
|
8398
PRA Group
PRAA
$768M
| $3.27K | ﹤0.01% |
172
-4,674
| -96% | -$83K |
2026 Q1
1 quarter
|
|
8399
VirTra
VTSI
$30.8M
| $3.26K | ﹤0.01% |
1,040
-1,624
| -61% | -$6.18K |
2025 Q3
3 quarters
|
|
8400
PUT
SI-BONE Inc
SIBN
$959M
| $3.26K | ﹤0.01% |
+200
| New | +$2.86K |
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.