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 | |
|---|---|---|---|---|---|---|
4051
PUT
Elanco Animal Health
ELAN
$11.2B
| $347K | ﹤0.01% |
14,100
-46,600
| -77% | -$1.08M |
|
4052
Biohaven
BHVN
$2B
| $347K | ﹤0.01% |
23,317
-11,620
| -33% | -$125K |
|
4053
Defiance Quantum ETF
QTUM
$5.63B
| $347K | ﹤0.01% |
2,097
-3,424
| -62% | -$492K |
|
4054
PUT
Root
ROOT
$724M
| $347K | ﹤0.01% |
6,200
+3,900
| +170% | +$208K |
|
4055
PUT
Itron
ITRI
$3.87B
| $346K | ﹤0.01% |
4,000
-18,100
| -82% | -$1.55M |
|
4056
EPAM Systems
EPAM
$5.55B
| $346K | ﹤0.01% |
+4,361
| New | +$461K |
|
|
DFDV
4057
DeFi Development Corp
DFDV
$182M
| $345K | ﹤0.01% |
117,477
+1,375
| +1% | +$5.26K |
|
4058
CALL
Funko
FNKO
$306M
| $345K | ﹤0.01% |
58,700
-13,400
| -19% | -$64.4K |
|
4059
PUT
Aclaris Therapeutics
ACRS
$799M
| $345K | ﹤0.01% |
65,200
| – | – |
|
4060
PUT
TechnipFMC
FTI
$27.7B
| $345K | ﹤0.01% |
5,200
-9,800
| -65% | -$694K |
|
4061
Insight Enterprises
NSIT
$4.58B
| $345K | ﹤0.01% |
2,830
+2,426
| +600% | +$221K |
|
4062
Ivanhoe Electric
IE
$1.7B
| $344K | ﹤0.01% |
35,746
+28,306
| +380% | +$358K |
|
4063
PUT
RingCentral
RNG
$6.36B
| $343K | ﹤0.01% |
8,800
+2,400
| +38% | +$96.9K |
|
4064
CALL
Broadridge
BR
$18.6B
| $342K | ﹤0.01% |
2,500
| – | – |
|
|
VENU
4065
CALL
Venu Holding Corp
VENU
$80.8M
| $342K | ﹤0.01% |
+150,800
| New | +$540K |
|
4066
CALL
Zebra Technologies
ZBRA
$17.6B
| $342K | ﹤0.01% |
1,300
-700
| -35% | -$165K |
|
4067
TFI International
TFII
$10.1B
| $342K | ﹤0.01% |
+2,383
| New | +$336K |
|
4068
CALL
Avalo Therapeutics
AVTX
$809M
| $342K | ﹤0.01% |
18,500
-31,200
| -63% | -$493K |
|
4069
PUT
Heritage Insurance Holdings
HRTG
$989M
| $342K | ﹤0.01% |
13,100
+13,000
| +13,000% | +$324K |
|
4070
CALL
Honda
HMC
$42.2B
| $342K | ﹤0.01% |
12,600
-1,300
| -9% | -$33.1K |
|
4071
iShares MSCI ACWI ex US ETF
ACWX
$16.1B
| $341K | ﹤0.01% |
+4,484
| New | +$334K |
|
4072
Arqit Quantum
ARQQ
$429M
| $341K | ﹤0.01% |
+11,472
| New | +$187K |
|
4073
Cerence
CRNC
$353M
| $341K | ﹤0.01% |
30,118
+26,181
| +665% | +$256K |
|
4074
CALL
CoinShares Bitcoin and Ether ETF
BTF
$17.1M
| $341K | ﹤0.01% |
5,400
+1,500
| +38% | +$29.1K |
|
|
WW
4075
WW International
WW
$150M
| $340K | ﹤0.01% |
21,297
+20,499
| +2,569% | +$274K |
|
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.