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 | |
|---|---|---|---|---|---|---|
1151
CALL
Sweetgreen
SG
$981M
| $5.43M | ﹤0.01% |
615,900
+85,300
| +16% | +$651K |
|
1152
PUT
Cytokinetics
CYTK
$8.99B
| $5.42M | ﹤0.01% |
63,600
+38,300
| +151% | +$2.75M |
|
1153
CALL
Ero Copper
ERO
$3.95B
| $5.41M | ﹤0.01% |
202,400
-66,400
| -25% | -$1.88M |
|
1154
PUT
United Microelectronic
UMC
$61B
| $5.41M | ﹤0.01% |
198,900
+74,800
| +60% | +$1.28M |
|
1155
DoorDash
DASH
$83.8B
| $5.41M | ﹤0.01% |
+29,297
| New | +$4.84M |
|
|
RGTX
1156
CALL
Defiance Daily Target 2X Long RGTI ETF
RGTX
$51.7M
| $5.41M | ﹤0.01% |
120,600
-6,900
| -5% | -$161K |
|
1157
PUT
Madison Square Garden
MSGE
$3.74B
| $5.4M | ﹤0.01% |
66,700
+66,600
| +66,600% | +$4.54M |
|
|
OKLO
1158
Oklo
OKLO
$7.08B
| $5.39M | ﹤0.01% |
+103,032
| New | +$6.43M |
|
1159
PUT
Kohl's
KSS
$2.03B
| $5.39M | ﹤0.01% |
304,200
-22,300
| -7% | -$331K |
|
1160
CALL
Domino's
DPZ
$9.66B
| $5.39M | ﹤0.01% |
18,200
+17,300
| +1,922% | +$5.69M |
|
1161
PUT
Parker-Hannifin
PH
$123B
| $5.38M | ﹤0.01% |
5,500
+1,600
| +41% | +$1.47M |
|
1162
CALL
Commault Systems
CVLT
$6.03B
| $5.37M | ﹤0.01% |
37,900
+36,700
| +3,058% | +$3.94M |
|
1163
CALL
Zillow
Z
$6.39B
| $5.36M | ﹤0.01% |
170,200
+129,500
| +318% | +$4.98M |
|
1164
PUT
Toll Brothers
TOL
$12.7B
| $5.35M | ﹤0.01% |
32,500
+18,900
| +139% | +$2.69M |
|
1165
PepsiCo
PEP
$176B
| $5.35M | ﹤0.01% |
39,506
-82,051
| -68% | -$12.3M |
|
1166
Ford
F
$50.7B
| $5.33M | ﹤0.01% |
+383,462
| New | +$5.17M |
|
1167
CALL
Futu Holdings
FUTU
$15.7B
| $5.32M | ﹤0.01% |
56,700
+15,000
| +36% | +$1.92M |
|
1168
Energy Transfer Partners
ET
$69.5B
| $5.3M | ﹤0.01% |
277,185
-117,048
| -30% | -$2.27M |
|
1169
PUT
Tapestry
TPR
$22.7B
| $5.3M | ﹤0.01% |
36,200
+8,000
| +28% | +$1.15M |
|
1170
PUT
Rocket Companies
RKT
$34.5B
| $5.3M | ﹤0.01% |
336,400
-10,200
| -3% | -$147K |
|
1171
Devon Energy
DVN
$51.8B
| $5.3M | ﹤0.01% |
+128,155
| New | +$5.94M |
|
1172
CALL
Edison International
EIX
$20.3B
| $5.28M | ﹤0.01% |
70,900
+35,900
| +103% | +$2.56M |
|
1173
CALL
Viavi Solutions
VIAV
$10B
| $5.28M | ﹤0.01% |
110,500
-6,700
| -6% | -$321K |
|
1174
CALL
HSBC
HSBC
$345B
| $5.26M | ﹤0.01% |
55,300
+12,000
| +28% | +$1.1M |
|
1175
CALL
Frontline
FRO
$10.6B
| $5.25M | ﹤0.01% |
150,900
+79,700
| +112% | +$2.93M |
|
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.