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 | |
|---|---|---|---|---|---|---|
3601
PUT
Genesis Energy
GEL
$1.72B
| $500K | ﹤0.01% |
35,300
+12,300
| +53% | +$198K |
|
3602
PUT
Everest Group
EG
$14.2B
| $500K | ﹤0.01% |
1,400
-2,100
| -60% | -$719K |
|
3603
PUT
PAR Technology
PAR
$564M
| $500K | ﹤0.01% |
28,700
-1,700
| -6% | -$24.5K |
|
3604
PUT
PTC
PTC
$15.2B
| $500K | ﹤0.01% |
4,400
+2,800
| +175% | +$378K |
|
3605
iShares MSCI Canada ETF
EWC
$7.04B
| $499K | ﹤0.01% |
+8,661
| New | +$501K |
|
3606
CALL
Charles River Laboratories
CRL
$14.1B
| $499K | ﹤0.01% |
2,200
+1,500
| +214% | +$267K |
|
3607
ASE Group
ASX
$114B
| $498K | ﹤0.01% |
+11,047
| New | +$371K |
|
3608
Commault Systems
CVLT
$6.14B
| $497K | ﹤0.01% |
+3,508
| New | +$377K |
|
3609
CALL
Adecoagro
AGRO
$1.45B
| $497K | ﹤0.01% |
52,000
+4,700
| +10% | +$59.2K |
|
3610
Darden Restaurants
DRI
$22.4B
| $496K | ﹤0.01% |
2,410
+1,069
| +80% | +$214K |
|
3611
Establishment Labs
ESTA
$1.95B
| $496K | ﹤0.01% |
+5,780
| New | +$415K |
|
3612
Transcat
TRNS
$804M
| $496K | ﹤0.01% |
+5,345
| New | +$436K |
|
3613
PUT
Sportradar
SRAD
$3.69B
| $496K | ﹤0.01% |
33,100
-113,200
| -77% | -$1.65M |
|
3614
PUT
First Watch Restaurant Group
FWRG
$626M
| $495K | ﹤0.01% |
38,400
+24,200
| +170% | +$284K |
|
3615
Materion
MTRN
$5.46B
| $495K | ﹤0.01% |
+1,663
| New | +$348K |
|
3616
American States Water
AWR
$3.22B
| $494K | ﹤0.01% |
5,981
+2,900
| +94% | +$225K |
|
3617
Lightpath Technologies
LPTH
$688M
| $494K | ﹤0.01% |
30,195
-60,242
| -67% | -$841K |
|
3618
PUT
Invesco
IVZ
$13.4B
| $493K | ﹤0.01% |
18,700
-5,400
| -22% | -$143K |
|
3619
Designer Brands
DBI
$322M
| $493K | ﹤0.01% |
84,633
-29,182
| -26% | -$205K |
|
|
CCC
3620
CCC Intelligent Solutions
CCC
$3.9B
| $493K | ﹤0.01% |
95,480
+82,001
| +608% | +$406K |
|
3621
CALL
ChargePoint
CHPT
$235M
| $492K | ﹤0.01% |
83,300
+20,200
| +32% | +$132K |
|
3622
CALL
Cinemark Holdings
CNK
$4.45B
| $492K | ﹤0.01% |
15,500
-24,900
| -62% | -$739K |
|
3623
Consolidated Edison
ED
$38B
| $491K | ﹤0.01% |
4,442
-10,541
| -70% | -$1.15M |
|
3624
CALL
Celldex Therapeutics
CLDX
$2.47B
| $491K | ﹤0.01% |
13,200
+11,200
| +560% | +$362K |
|
3625
CALL
Crane Co
CR
$12B
| $491K | ﹤0.01% |
+2,200
| New | +$415K |
|
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.