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 | |
|---|---|---|---|---|---|---|
176
CALL
Seagate
STX
$208B
| $75.7M | 0.04% |
78,400
-21,800
| -22% | -$16.6M |
|
177
PUT
Super Micro Computer
SMCI
$28.4B
| $75.5M | 0.04% |
2,572,600
+126,200
| +5% | +$4.02M |
|
178
CALL
AST SpaceMobile
ASTS
$18.5B
| $75.4M | 0.04% |
848,600
+83,300
| +11% | +$7.27M |
|
|
179
Apple
AAPL
$4.98T
| $75.1M | 0.04% |
259,549
+219,765
| +552% | +$62.9M |
|
180
CALL
Uber
UBER
$142B
| $75M | 0.04% |
1,039,400
-122,600
| -11% | -$8.99M |
|
181
CALL
Pfizer
PFE
$163B
| $73.8M | 0.04% |
3,064,500
+815,900
| +36% | +$21.3M |
|
182
Microsoft
MSFT
$3.83T
| $73.7M | 0.04% |
197,528
+60,799
| +44% | +$24.6M |
|
183
CALL
Devon Energy
DVN
$51.8B
| $73.6M | 0.04% |
1,780,200
+1,128,400
| +173% | +$52.3M |
|
|
184
CALL
Super Micro Computer
SMCI
$28.4B
| $72.9M | 0.04% |
2,485,700
-296,500
| -11% | -$9.45M |
|
185
CALL
PayPal
PYPL
$47.1B
| $72.1M | 0.04% |
1,669,700
-1,065,000
| -39% | -$48.4M |
|
186
CALL
Arista Networks
ANET
$261B
| $72.1M | 0.04% |
424,400
+26,000
| +7% | +$4.08M |
|
187
CALL
Occidental Petroleum
OXY
$56.8B
| $71M | 0.04% |
1,460,900
+2,700
| +0.2% | +$153K |
|
|
188
PUT
Uber
UBER
$142B
| $70.6M | 0.04% |
978,300
-449,400
| -31% | -$33M |
|
|
189
TSMC
TSM
$2.34T
| $70.4M | 0.04% |
147,407
-204,398
| -58% | -$82.9M |
|
190
CALL
Costco
COST
$409B
| $69.3M | 0.04% |
74,100
-66,700
| -47% | -$66.5M |
|
191
PUT
GE Aerospace
GE
$339B
| $69.2M | 0.04% |
185,100
+52,900
| +40% | +$16.6M |
|
192
PUT
Coherent
COHR
$57.9B
| $68.5M | 0.04% |
173,600
+54,100
| +45% | +$19.1M |
|
|
193
PUT
PayPal
PYPL
$47.1B
| $68.5M | 0.04% |
1,585,800
+498,500
| +46% | +$22.7M |
|
194
CALL
Rocket Lab Corp
RKLB
$47.3B
| $67.7M | 0.04% |
666,000
-16,600
| -2% | -$1.65M |
|
195
CALL
Intuit
INTU
$73.7B
| $67M | 0.04% |
256,600
+202,700
| +376% | +$70.6M |
|
196
CALL
TeraWulf
WULF
$7.85B
| $66.1M | 0.04% |
2,677,600
-367,400
| -12% | -$8.45M |
|
197
CALL
Reddit
RDDT
$28.8B
| $65.9M | 0.04% |
379,700
-27,200
| -7% | -$4.36M |
|
|
KFYP
198
PUT
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $65.2M | 0.04% |
2,696,000
-913,300
| -25% | -$22.1M |
|
199
CALL
Energy Transfer Partners
ET
$69.5B
| $64.8M | 0.04% |
3,387,700
-295,300
| -8% | -$5.72M |
|
|
METD
200
PUT
Direxion Daily META Bear 1X ETF
METD
$5.27M
| $64.3M | 0.04% |
398,100
+87,600
| +28% | +$1.44M |
|
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.