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 | |
|---|---|---|---|---|---|---|
1201
CALL
Skyworks Solutions
SWKS
$13.4B
| $5.06M | ﹤0.01% |
74,600
+54,200
| +266% | +$3.69M |
|
1202
PUT
Guardant Health
GH
$23.8B
| $5.06M | ﹤0.01% |
33,700
+14,100
| +72% | +$1.53M |
|
1203
PUT
Baker Hughes
BKR
$57.4B
| $5.04M | ﹤0.01% |
90,900
+29,000
| +47% | +$1.83M |
|
1204
PUT
Automatic Data Processing
ADP
$105B
| $5.02M | ﹤0.01% |
22,400
-15,900
| -42% | -$3.4M |
|
1205
CALL
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.2B
| $5.01M | ﹤0.01% |
33,300
-51,200
| -61% | -$3.42M |
|
1206
CALL
Trane Technologies
TT
$100B
| $5.01M | ﹤0.01% |
10,200
+6,300
| +162% | +$2.95M |
|
1207
PUT
Monster Beverage
MNST
$84.5B
| $4.98M | ﹤0.01% |
103,600
-85,600
| -45% | -$3.6M |
|
1208
FuelCell Energy
FCEL
$1.32B
| $4.97M | ﹤0.01% |
138,054
+137,967
| +158,583% | +$2.24M |
|
1209
PUT
Kinder Morgan
KMI
$68.5B
| $4.97M | ﹤0.01% |
155,400
-46,600
| -23% | -$1.5M |
|
1210
W.W. Grainger
GWW
$58.5B
| $4.95M | ﹤0.01% |
+3,641
| New | +$4.49M |
|
|
XOVR
1211
PUT
EntrepreneurShares Series Trust ERShares Private-Public Crossover ETF
XOVR
$1.52B
| $4.92M | ﹤0.01% |
233,500
+230,800
| +8,548% | +$4.41M |
|
1212
Twilio
TWLO
$42.4B
| $4.91M | ﹤0.01% |
+23,820
| New | +$4.22M |
|
1213
CALL
Campbell Soup
CPB
$5.78B
| $4.91M | ﹤0.01% |
220,400
+47,800
| +28% | +$1.01M |
|
1214
PUT
D.R. Horton
DHI
$39.6B
| $4.9M | ﹤0.01% |
30,100
+15,200
| +102% | +$2.27M |
|
1215
CALL
Redwire
RDW
$2.9B
| $4.9M | ﹤0.01% |
400,400
-436,000
| -52% | -$5.75M |
|
1216
CALL
Erasca
ERAS
$4.98B
| $4.89M | ﹤0.01% |
267,000
+199,000
| +293% | +$2.85M |
|
1217
CALL
Prologis
PLD
$126B
| $4.89M | ﹤0.01% |
36,100
-19,600
| -35% | -$2.78M |
|
|
CMPS
1218
CALL
Compass Pathways
CMPS
$1.81B
| $4.89M | ﹤0.01% |
345,600
+248,000
| +254% | +$2.52M |
|
1219
PUT
Crocs
CROX
$6.05B
| $4.89M | ﹤0.01% |
40,500
-8,200
| -17% | -$896K |
|
1220
CALL
Mobileye
MBLY
$6.83B
| $4.88M | ﹤0.01% |
504,600
+180,700
| +56% | +$1.61M |
|
1221
PUT
eBay
EBAY
$48B
| $4.88M | ﹤0.01% |
43,700
-65,300
| -60% | -$6.97M |
|
1222
CALL
Vanguard FTSE Developed Markets ETF
VEA
$235B
| $4.88M | ﹤0.01% |
68,500
+61,300
| +851% | +$4.27M |
|
1223
CALL
Lennar Class A
LEN
$19.8B
| $4.87M | ﹤0.01% |
88,800
-18,800
| -17% | -$1.68M |
|
1224
KKR & Co
KKR
$86.8B
| $4.86M | ﹤0.01% |
52,985
-7,662
| -13% | -$743K |
|
|
FPS
1225
PUT
Forgent Power Solutions
FPS
$10.7B
| $4.86M | ﹤0.01% |
87,000
+86,500
| +17,300% | +$3.95M |
|
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.