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 | Held Since | |
|---|---|---|---|---|---|---|---|
8251
Global X U.S. 500 Income Edge ETF
EDGX
$5.28M
| $4.37K | ﹤0.01% |
+164
| New | +$4.28K |
2026 Q2
0 quarters
|
|
8252
CALL
Crescent Capital BDC
CCAP
$323M
| $4.37K | ﹤0.01% |
400
| – | – |
2021 Q4
18 quarters
|
|
8253
Leverage Shares 2X Long CIEN Daily ETF
CIEG
$6.26M
| $4.35K | ﹤0.01% |
+455
| New | +$5.23K |
2026 Q2
0 quarters
|
|
8254
Docebo
DCBO
$762M
| $4.35K | ﹤0.01% |
243
+151
| +164% | +$2.68K |
2026 Q1
1 quarter
|
|
8255
CALL
Design Therapeutics
DSGN
$658M
| $4.34K | ﹤0.01% |
+300
| New | +$3.74K |
2026 Q2
0 quarters
|
|
8256
PUT
Oric Pharmaceuticals
ORIC
$1.41B
| $4.33K | ﹤0.01% |
400
| – | – |
2026 Q1
1 quarter
|
|
8257
T-Rex 2X Long Microsoft Daily Target ETF
MSFX
$18.4M
| $4.32K | ﹤0.01% |
295
-419
| -59% | -$7.46K |
2026 Q1
1 quarter
|
|
8258
PUT
First Trust Indxx Innovative Transaction & Process ETF
LEGR
$127M
| $4.31K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8259
State Street SPDR Portfolio Aggregate Bond ETF
SPAB
$10.4B
| $4.31K | ﹤0.01% |
+169
| New | +$4.31K |
2026 Q2
0 quarters
|
|
8260
Defiance Daily Target 2x Short RGTI ETF
RGTZ
$123M
| $4.29K | ﹤0.01% |
231
-341
| -60% | -$17.7K |
2026 Q1
1 quarter
|
|
8261
CALL
TIM SA
TIMB
$9.24B
| $4.28K | ﹤0.01% |
200
-100
| -33% | -$2.38K |
2025 Q4
2 quarters
|
|
8262
ARK Israel Innovative Technology ETF
IZRL
$132M
| $4.28K | ﹤0.01% |
141
-363
| -72% | -$10.9K |
2025 Q1
5 quarters
|
|
8263
Leverage Shares 2X Long ONDS Daily ETF
ONDG
$12.8M
| $4.28K | ﹤0.01% |
+1,286
| New | +$7.33K |
2026 Q2
0 quarters
|
|
8264
PUT
Stratasys
SSYS
$604M
| $4.28K | ﹤0.01% |
500
-400
| -44% | -$3.5K |
2021 Q2
20 quarters
|
|
8265
Tradr 2X Long Innovation ETFShort Innovation Daily ETF
SARK
$36.7M
| $4.26K | ﹤0.01% |
158
-20
| -11% | -$579 |
2026 Q1
1 quarter
|
|
8266
Rekor Systems
REKR
$43.9M
| $4.23K | ﹤0.01% |
+6,092
| New | +$4.78K |
2026 Q2
0 quarters
|
|
8267
PUT
Atlantic Union Bankshares
AUB
$5.69B
| $4.23K | ﹤0.01% |
100
| – | – |
2025 Q3
3 quarters
|
|
8268
CALL
Ribbon Communications
RBBN
$238M
| $4.21K | ﹤0.01% |
1,800
-4,700
| -72% | -$12.4K |
2026 Q1
1 quarter
|
|
8269
PUT
TRX Gold Corp
TRX
$319M
| $4.21K | ﹤0.01% |
5,100
-70,400
| -93% | -$81.6K |
2026 Q1
1 quarter
|
|
8270
PUT
Tilly's
TLYS
$137M
| $4.2K | ﹤0.01% |
1,000
-11,000
| -92% | -$49.8K |
2025 Q4
2 quarters
|
|
8271
CALL
Guardian Pharmacy Services
GRDN
$2.49B
| $4.19K | ﹤0.01% |
+100
| New | +$3.87K |
2026 Q2
0 quarters
|
|
8272
Roundhill MSTR WeeklyPay ETF
MSTW
$61.3M
| $4.17K | ﹤0.01% |
1,315
-816
| -38% | -$5.55K |
2025 Q4
2 quarters
|
|
8273
PUT
Commerce.com Inc Series 1
CMRC
$304M
| $4.14K | ﹤0.01% |
1,400
| – | – |
2020 Q3
23 quarters
|
|
8274
PUT
Syntax Stratified LargeCap ETF
SSPY
$132M
| $4.14K | ﹤0.01% |
400
-1,100
| -73% | -$103K |
2026 Q1
1 quarter
|
|
8275
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $4.13K | ﹤0.01% |
+76,500
| New | +$17.9K |
2026 Q2
0 quarters
|
|
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.