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 | |
|---|---|---|---|---|---|---|
3101
CALL
Factset
FDS
$9.6B
| $759K | ﹤0.01% |
3,300
-16,400
| -83% | -$3.77M |
|
3102
CALL
Invesco CurrencyShares Euro Currency Trust
FXE
$368M
| $759K | ﹤0.01% |
7,200
-3,000
| -29% | -$322K |
|
3103
CALL
Mercury Insurance
MCY
$5.51B
| $757K | ﹤0.01% |
7,100
-12,400
| -64% | -$1.22M |
|
3104
CALL
Vaxcyte
PCVX
$8.49B
| $756K | ﹤0.01% |
13,000
+10,400
| +400% | +$565K |
|
3105
PUT
Teck Resources
TECK
$31.7B
| $755K | ﹤0.01% |
12,700
-26,000
| -67% | -$1.58M |
|
|
GLDB
3106
CALL
IDX Alternative FIAT ETF
GLDB
$37.5M
| $754K | ﹤0.01% |
429,800
+189,400
| +79% | +$4.38M |
|
3107
PUT
EPAM Systems
EPAM
$5.61B
| $754K | ﹤0.01% |
9,500
+4,400
| +86% | +$465K |
|
3108
PUT
Transportadora de Gas del Sur
TGS
$3.93B
| $752K | ﹤0.01% |
25,300
+2,400
| +10% | +$74.3K |
|
|
AMTM
3109
PUT
Amentum Holdings
AMTM
$4.55B
| $750K | ﹤0.01% |
36,300
+26,300
| +263% | +$636K |
|
3110
PUT
Azenta
AZTA
$1.52B
| $750K | ﹤0.01% |
29,400
+26,900
| +1,076% | +$603K |
|
3111
CALL
Black Stone Minerals
BSM
$3.09B
| $750K | ﹤0.01% |
53,700
+7,300
| +16% | +$102K |
|
3112
PUT
Martin Marietta Materials
MLM
$34.7B
| $750K | ﹤0.01% |
1,300
+800
| +160% | +$474K |
|
|
LKFT
3113
PUT
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.96B
| $750K | ﹤0.01% |
25,000
-100
| -0.4% | -$2.84K |
|
3114
CALL
Americold
COLD
$4.17B
| $748K | ﹤0.01% |
47,600
+24,300
| +104% | +$333K |
|
3115
PUT
AdaptHealth
AHCO
$755M
| $747K | ﹤0.01% |
71,700
+63,200
| +744% | +$706K |
|
3116
CALL
Ezcorp Inc
EZPW
$1.89B
| $747K | ﹤0.01% |
21,600
+18,800
| +671% | +$593K |
|
3117
PUT
Prospect Capital
PSEC
$1.14B
| $746K | ﹤0.01% |
323,100
+278,400
| +623% | +$686K |
|
3118
CALL
Asana
ASAN
$1.99B
| $745K | ﹤0.01% |
106,400
+35,600
| +50% | +$239K |
|
|
METU
3119
Direxion Daily META Bull 2X ETF
METU
$466M
| $745K | ﹤0.01% |
36,779
+12,918
| +54% | +$322K |
|
3120
CALL
Viking Holdings
VIK
$35.4B
| $743K | ﹤0.01% |
7,100
-29,900
| -81% | -$2.59M |
|
3121
PUT
TC Energy
TRP
$61.3B
| $742K | ﹤0.01% |
11,200
-38,700
| -78% | -$2.56M |
|
3122
Stellantis
STLA
$13.5B
| $742K | ﹤0.01% |
129,314
-227,474
| -64% | -$1.68M |
|
3123
CALL
Huntsman Corp
HUN
$1.54B
| $741K | ﹤0.01% |
69,800
-123,900
| -64% | -$1.71M |
|
|
HTGCR
3124
CALL
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $741K | ﹤0.01% |
47,000
-69,700
| -60% | -$1.1M |
|
3125
iShares MSCI France ETF
EWQ
$360M
| $740K | ﹤0.01% |
+16,299
| New | +$741K |
|
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.