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 | |
|---|---|---|---|---|---|---|
4126
Outlook Therapeutics
OTLK
$151M
| $326K | ﹤0.01% |
205,013
+72,347
| +55% | +$44.9K |
|
|
ACB
4127
CALL
Aurora Cannabis
ACB
$259M
| $326K | ﹤0.01% |
116,800
+44,800
| +62% | +$150K |
|
4128
CALL
Cimpress
CMPR
$1.95B
| $325K | ﹤0.01% |
3,200
+600
| +23% | +$53.3K |
|
4129
CALL
Caleres
CAL
$432M
| $325K | ﹤0.01% |
26,300
+26,000
| +8,667% | +$337K |
|
4130
CALL
Richardson Electronics
RELL
$254M
| $325K | ﹤0.01% |
17,100
+6,900
| +68% | +$108K |
|
4131
CALL
Brookdale Senior Living
BKD
$2.64B
| $325K | ﹤0.01% |
20,200
+2,100
| +12% | +$28.6K |
|
|
JMIA
4132
Jumia Technologies
JMIA
$895M
| $324K | ﹤0.01% |
46,016
+9,474
| +26% | +$67.3K |
|
|
BTC
4133
PUT
Grayscale Bitcoin Mini Trust ETF
BTC
$4.42B
| $324K | ﹤0.01% |
12,500
-3,400
| -21% | -$108K |
|
4134
PUT
Dentsply Sirona
XRAY
$1.85B
| $324K | ﹤0.01% |
30,500
-30,800
| -50% | -$336K |
|
4135
Affiliated Managers Group
AMG
$9.52B
| $323K | ﹤0.01% |
955
-496
| -34% | -$154K |
|
4136
Perimeter Solutions
PRM
$4.56B
| $323K | ﹤0.01% |
9,058
+7,086
| +359% | +$221K |
|
4137
MoonLake Immunotherapeutics
MLTX
$984M
| $323K | ﹤0.01% |
16,566
+13,491
| +439% | +$245K |
|
4138
CALL
SES AI
SES
$198M
| $322K | ﹤0.01% |
335,700
+137,400
| +69% | +$150K |
|
|
BZAI
4139
CALL
Blaize Holdings
BZAI
$71.8M
| $322K | ﹤0.01% |
233,400
-97,300
| -29% | -$171K |
|
4140
CALL
Relmada Therapeutics
RLMD
$404M
| $322K | ﹤0.01% |
46,500
-14,000
| -23% | -$97.8K |
|
|
SHAZ
4141
PUT
SharonAI Holdings
SHAZ
$1.89B
| $322K | ﹤0.01% |
+3,800
| New | +$214K |
|
4142
PUT
Brink's
BCO
$4.31B
| $321K | ﹤0.01% |
3,400
+1,300
| +62% | +$135K |
|
|
AIRL
4143
PUT
DELISTED
Themes Airlines ETF
AIRL
| $321K | ﹤0.01% |
22,300
-17,500
| -44% | -$252K |
|
4144
PUT
CorMedix
CRMD
$615M
| $321K | ﹤0.01% |
40,900
-26,600
| -39% | -$210K |
|
4145
CALL
Nuvation Bio
NUVB
$1.97B
| $321K | ﹤0.01% |
56,500
+32,900
| +139% | +$161K |
|
4146
PUT
TD Synnex
SNX
$20.3B
| $321K | ﹤0.01% |
+1,200
| New | +$289K |
|
4147
PUT
Plains GP Holdings
PAGP
$5.26B
| $320K | ﹤0.01% |
13,200
-438,600
| -97% | -$10.5M |
|
4148
CALL
Burford Capital
BUR
$863M
| $320K | ﹤0.01% |
78,100
-86,900
| -53% | -$397K |
|
4149
PUT
Commercial Metals
CMC
$7.13B
| $320K | ﹤0.01% |
5,100
+1,900
| +59% | +$134K |
|
|
VIVO
4150
CALL
VivoPower PLC
VIVO
$126M
| $320K | ﹤0.01% |
61,900
+59,400
| +2,376% | +$245K |
|
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.