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 | |
|---|---|---|---|---|---|---|
1076
PUT
Vestis
VSTS
$1.8B
| $6.06M | ﹤0.01% |
417,100
+402,900
| +2,837% | +$4.5M |
|
1077
PUT
McKesson
MCK
$101B
| $6.04M | ﹤0.01% |
8,000
+4,900
| +158% | +$3.88M |
|
1078
PUT
Innodata
INOD
$2.38B
| $6.03M | ﹤0.01% |
79,800
-2,100
| -3% | -$154K |
|
1079
PUT
Alnylam Pharmaceuticals
ALNY
$34.2B
| $6.02M | ﹤0.01% |
20,000
+1,800
| +10% | +$543K |
|
1080
PUT
Mondelez International
MDLZ
$76.9B
| $6.01M | ﹤0.01% |
103,900
-7,900
| -7% | -$476K |
|
1081
CALL
American Conservative Values ETF
ACVF
$154M
| $6M | ﹤0.01% |
1,489,500
+592,400
| +66% | +$31M |
|
1082
Cloudflare
NET
$124B
| $5.99M | ﹤0.01% |
+24,408
| New | +$5.34M |
|
1083
CALL
Progressive
PGR
$119B
| $5.99M | ﹤0.01% |
27,400
+7,900
| +41% | +$1.59M |
|
1084
CALL
Zions Bancorporation
ZION
$9.32B
| $5.98M | ﹤0.01% |
86,500
+53,300
| +161% | +$3.36M |
|
1085
United Airlines
UAL
$37B
| $5.96M | ﹤0.01% |
+43,847
| New | +$4.54M |
|
1086
CALL
Gartner
IT
$11.9B
| $5.96M | ﹤0.01% |
46,000
+10,700
| +30% | +$1.61M |
|
1087
CALL
DigitalBridge
DBRG
$3B
| $5.94M | ﹤0.01% |
376,300
-6,200
| -2% | -$97K |
|
1088
PUT
Amplify Online Retail ETF
IBUY
$120M
| $5.93M | ﹤0.01% |
222,000
-142,200
| -39% | -$9.49M |
|
1089
PUT
Opendoor
OPEN
$2.5B
| $5.92M | ﹤0.01% |
1,551,400
+487,600
| +46% | +$2.33M |
|
1090
PUT
Upstart Holdings
UPST
$2.32B
| $5.92M | ﹤0.01% |
167,200
+10,000
| +6% | +$308K |
|
1091
PayPal
PYPL
$47.1B
| $5.91M | ﹤0.01% |
136,916
+124,428
| +996% | +$5.66M |
|
|
IPFF
1092
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $5.91M | ﹤0.01% |
123,800
-278,800
| -69% | -$13.3M |
|
1093
Teva Pharmaceutical Industries Limited
TEVA
$45.7B
| $5.91M | ﹤0.01% |
174,409
+163,094
| +1,441% | +$5.43M |
|
1094
PUT
Vaxcyte
PCVX
$8.36B
| $5.91M | ﹤0.01% |
101,600
+56,900
| +127% | +$3.09M |
|
1095
PUT
Bitdeer Technologies
BTDR
$3.13B
| $5.9M | ﹤0.01% |
372,000
+1,900
| +0.5% | +$27.3K |
|
1096
CALL
Novartis
NVS
$276B
| $5.88M | ﹤0.01% |
37,500
+7,600
| +25% | +$1.14M |
|
1097
Amplify Junior Silver Miners ETF
SILJ
$3.81B
| $5.86M | ﹤0.01% |
226,049
+69,762
| +45% | +$2.07M |
|
1098
PUT
NuScale Power
SMR
$3.46B
| $5.86M | ﹤0.01% |
583,800
-191,200
| -25% | -$2.16M |
|
1099
CALL
Maplebear
CART
$10B
| $5.84M | ﹤0.01% |
123,400
-35,100
| -22% | -$1.47M |
|
1100
Airbnb
ABNB
$92.8B
| $5.84M | ﹤0.01% |
+40,829
| New | +$5.57M |
|
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.