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 | |
|---|---|---|---|---|---|---|
5126
Surgery Partners
SGRY
$1.89B
| $143K | ﹤0.01% |
8,540
+5,742
| +205% | +$80.6K |
|
|
BSOL
5127
Bitwise Solana Staking ETF
BSOL
$967M
| $143K | ﹤0.01% |
14,327
-4,693
| -25% | -$51.1K |
|
5128
CALL
Methanex
MEOH
$4.6B
| $143K | ﹤0.01% |
3,100
-58,900
| -95% | -$3.47M |
|
5129
CALL
Better Home & Finance Holding
BETR
$194M
| $143K | ﹤0.01% |
5,200
-4,100
| -44% | -$133K |
|
5130
Copa Holdings
CPA
$5.43B
| $143K | ﹤0.01% |
919
+46
| +5% | +$5.99K |
|
5131
PUT
Brookfield Infrastructure
BIPC
$4.39B
| $142K | ﹤0.01% |
3,700
+2,400
| +185% | +$96.8K |
|
5132
Arbe Robotics
ARBE
$77.4M
| $142K | ﹤0.01% |
171,569
-14,132
| -8% | -$12.2K |
|
5133
Laureate Education
LAUR
$5.29B
| $142K | ﹤0.01% |
3,920
+3,812
| +3,530% | +$129K |
|
5134
PUT
StoneX
SNEX
$7.87B
| $142K | ﹤0.01% |
1,800
+1,650
| +1,100% | +$124K |
|
5135
STAAR Surgical
STAA
$1.12B
| $142K | ﹤0.01% |
4,954
+2,466
| +99% | +$68.6K |
|
5136
InflaRx
IFRX
$273M
| $142K | ﹤0.01% |
+63,405
| New | +$119K |
|
5137
Collegium Pharmaceutical
COLL
$724M
| $142K | ﹤0.01% |
3,916
+3,657
| +1,412% | +$125K |
|
|
KLC
5138
PUT
KinderCare Learning Companies
KLC
$230M
| $142K | ﹤0.01% |
+33,300
| New | +$123K |
|
5139
Morgan Stanley Direct Lending Fund
MSDL
$1.2B
| $142K | ﹤0.01% |
9,360
+3,464
| +59% | +$52.5K |
|
5140
PUT
Cencora
COR
$58.7B
| $141K | ﹤0.01% |
500
-7,500
| -94% | -$2.16M |
|
|
ACB
5141
PUT
Aurora Cannabis
ACB
$255M
| $141K | ﹤0.01% |
50,700
+22,800
| +82% | +$76.3K |
|
5142
PUT
abrdn Physical Palladium Shares ETF
PALL
$638M
| $141K | ﹤0.01% |
6,400
-1,100
| -15% | -$28.1K |
|
5143
PUT
AllianceBernstein
AB
$3.31B
| $141K | ﹤0.01% |
4,000
-7,600
| -66% | -$287K |
|
|
ONT
5144
Onterris Inc
ONT
$496M
| $141K | ﹤0.01% |
6,963
+3,590
| +106% | +$67K |
|
5145
The Ensign Group
ENSG
$10.2B
| $141K | ﹤0.01% |
877
+119
| +16% | +$21K |
|
5146
CALL
C4 Therapeutics
CCCC
$385M
| $141K | ﹤0.01% |
30,100
+600
| +2% | +$2.05K |
|
5147
PUT
NeoVolta
NEOV
$150M
| $140K | ﹤0.01% |
+44,600
| New | +$113K |
|
5148
CALL
Zura Bio
ZURA
$383M
| $140K | ﹤0.01% |
23,800
+23,700
| +23,700% | +$113K |
|
5149
CALL
Relay Therapeutics
RLAY
$4.02B
| $140K | ﹤0.01% |
7,500
+200
| +3% | +$2.9K |
|
|
ALMS
5150
Alumis Inc
ALMS
$944M
| $140K | ﹤0.01% |
4,986
-3,044
| -38% | -$70.8K |
|
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.