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 | |
|---|---|---|---|---|---|---|---|
7101
Schwab U.S Small- Cap ETF
SCHA
$21.6B
| $20.2K | ﹤0.01% |
+558
| New | +$18.4K |
2026 Q2
0 quarters
|
|
7102
PUT
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $20.2K | ﹤0.01% |
373,200
+15,700
| +4% | +$3.68K |
2024 Q3
7 quarters
|
|
7103
PUT
Alpha Tau Medical
DRTS
$1.22B
| $20.1K | ﹤0.01% |
1,600
+1,300
| +433% | +$11.8K |
2026 Q1
1 quarter
|
|
7104
CALL
Gain Therapeutics
GANX
$55M
| $20.1K | ﹤0.01% |
9,900
+5,800
| +141% | +$10.7K |
2025 Q3
3 quarters
|
|
7105
CALL
Fate Therapeutics
FATE
$253M
| $20K | ﹤0.01% |
7,400
-7,000
| -49% | -$13K |
2024 Q1
9 quarters
|
|
7106
CALL
QuickLogic
QUIK
$161M
| $20K | ﹤0.01% |
1,000
| – | – |
2023 Q3
11 quarters
|
|
7107
CALL
CuriosityStream
CURI
$169M
| $20K | ﹤0.01% |
7,500
+4,500
| +150% | +$13.3K |
2024 Q2
8 quarters
|
|
7108
CALL
Seacoast Banking Corp of Florida
SBCF
$3.25B
| $20K | ﹤0.01% |
600
+400
| +200% | +$12.5K |
2026 Q1
1 quarter
|
|
7109
Excelerate Energy
EE
$1.02B
| $19.9K | ﹤0.01% |
525
+473
| +910% | +$16.3K |
2026 Q1
1 quarter
|
|
7110
Colliers International
CIGI
$4.75B
| $19.9K | ﹤0.01% |
212
-223
| -51% | -$22.5K |
2026 Q1
1 quarter
|
|
7111
CALL
Banco de Chile
BCH
$19.4B
| $19.9K | ﹤0.01% |
500
| – | – |
2025 Q3
3 quarters
|
|
7112
CareDx
CDNA
$3.58B
| $19.8K | ﹤0.01% |
+695
| New | +$15.1K |
2026 Q2
0 quarters
|
|
7113
PUT
Neogen
NEOG
$2.66B
| $19.8K | ﹤0.01% |
2,200
-10,200
| -82% | -$93.6K |
2022 Q2
16 quarters
|
|
7114
PUT
Valvoline
VVV
$4.04B
| $19.8K | ﹤0.01% |
500
+400
| +400% | +$13.9K |
2025 Q2
4 quarters
|
|
7115
Tradeweb Markets
TW
$25.9B
| $19.7K | ﹤0.01% |
198
-989
| -83% | -$107K |
2025 Q3
3 quarters
|
|
7116
PUT
Capital Group Dividend Value ETF
CGDV
$38.3B
| $19.7K | ﹤0.01% |
+400
| New | +$18.8K |
2026 Q2
0 quarters
|
|
|
7117
PUT
Fate Therapeutics
FATE
$253M
| $19.7K | ﹤0.01% |
7,300
-1,700
| -19% | -$3.15K |
2025 Q3
3 quarters
|
|
7118
Tradr 2X Long QBTS Daily ETF
QBTX
$124M
| $19.7K | ﹤0.01% |
329
-361
| -52% | -$22K |
2026 Q1
1 quarter
|
|
7119
Invesco NASDAQ 100 ETF
QQQM
$105B
| $19.7K | ﹤0.01% |
+65
| New | +$18.4K |
2026 Q2
0 quarters
|
|
7120
Breakwave Dry Bulk Shipping ETF
BDRY
$26.8M
| $19.7K | ﹤0.01% |
1,658
-3,545
| -68% | -$42.2K |
2022 Q2
16 quarters
|
|
7121
GraniteShares 2x Short COIN Daily ETF
CONI
$12.2M
| $19.6K | ﹤0.01% |
309
-2,557
| -89% | -$129K |
2025 Q1
5 quarters
|
|
7122
iShares MSCI Global Metals & Mining Producers ETF
PICK
$2.22B
| $19.6K | ﹤0.01% |
337
-936
| -74% | -$58.6K |
2025 Q4
2 quarters
|
|
7123
Leverage Shares 2X Long ARM Daily ETF
ARMG
$55.4M
| $19.6K | ﹤0.01% |
497
-2,102
| -81% | -$58.4K |
2026 Q1
1 quarter
|
|
7124
Atour Lifestyle Holdings
ATAT
$4.29B
| $19.5K | ﹤0.01% |
+614
| New | +$22K |
2026 Q2
0 quarters
|
|
7125
Axalta
AXTA
$7.31B
| $19.5K | ﹤0.01% |
570
+425
| +293% | +$12.8K |
2024 Q3
7 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.