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 | |
|---|---|---|---|---|---|---|
2701
PUT
PennyMac Financial
PFSI
$3.4B
| $1.07M | ﹤0.01% |
12,300
-2,000
| -14% | -$174K |
|
2702
Match Group
MTCH
$9.31B
| $1.07M | ﹤0.01% |
+28,154
| New | +$998K |
|
|
PPTA
2703
CALL
Perpetua Resources
PPTA
$2.94B
| $1.07M | ﹤0.01% |
51,600
+24,400
| +90% | +$662K |
|
2704
Carlyle Group
CG
$14.3B
| $1.07M | ﹤0.01% |
+25,415
| New | +$1.19M |
|
2705
CALL
TORM
TRMD
$3.52B
| $1.07M | ﹤0.01% |
41,000
+34,200
| +503% | +$1.04M |
|
2706
PUT
Owens Corning
OC
$9.79B
| $1.07M | ﹤0.01% |
6,700
-30,200
| -82% | -$3.67M |
|
2707
PUT
CBRE Group
CBRE
$39B
| $1.06M | ﹤0.01% |
7,900
-3,100
| -28% | -$427K |
|
2708
PUT
Atlas Energy Solutions
AESI
$1.56B
| $1.06M | ﹤0.01% |
64,000
+61,300
| +2,270% | +$1M |
|
2709
Semtech
SMTC
$17B
| $1.06M | ﹤0.01% |
+6,560
| New | +$857K |
|
2710
CALL
BellRing Brands
BRBR
$920M
| $1.06M | ﹤0.01% |
82,000
+44,800
| +120% | +$540K |
|
|
CHGX
2711
CALL
DELISTED
AXS Change Finance ESG ETF
CHGX
| $1.06M | ﹤0.01% |
46,600
-89,600
| -66% | -$2.04M |
|
2712
PUT
Lloyds Banking Group
LYG
$83.2B
| $1.06M | ﹤0.01% |
181,600
+143,100
| +372% | +$776K |
|
2713
CALL
Resideo Technologies
REZI
$2.77B
| $1.06M | ﹤0.01% |
34,000
-2,300
| -6% | -$79.1K |
|
2714
CALL
MoonLake Immunotherapeutics
MLTX
$1.02B
| $1.06M | ﹤0.01% |
54,300
-50,200
| -48% | -$910K |
|
2715
Enovis
ENOV
$1.06B
| $1.06M | ﹤0.01% |
51,073
+23,880
| +88% | +$563K |
|
2716
PUT
Travelers Companies
TRV
$75.7B
| $1.06M | ﹤0.01% |
3,200
-2,000
| -38% | -$606K |
|
2717
AngloGold Ashanti
AU
$50.1B
| $1.05M | ﹤0.01% |
13,040
-10,943
| -46% | -$1.04M |
|
|
BCYC
2718
PUT
Bicycle Therapeutics
BCYC
$258M
| $1.05M | ﹤0.01% |
248,700
+64,700
| +35% | +$297K |
|
2719
PUT
Zebra Technologies
ZBRA
$17.5B
| $1.05M | ﹤0.01% |
4,000
+3,600
| +900% | +$847K |
|
2720
ProShares K-1 Free Crude Oil Strategy ETF
OILK
$237M
| $1.05M | ﹤0.01% |
22,171
-2,735
| -11% | -$150K |
|
2721
CALL
Scotiabank
BNS
$114B
| $1.05M | ﹤0.01% |
12,100
-49,100
| -80% | -$3.87M |
|
2722
CALL
APi Group
APG
$16.6B
| $1.05M | ﹤0.01% |
24,800
-32,100
| -56% | -$1.4M |
|
2723
PUT
Mineralys Therapeutics
MLYS
$2.29B
| $1.05M | ﹤0.01% |
38,900
+33,000
| +559% | +$905K |
|
2724
PUT
ProShares Ether Strategy ETF
EETH
$73.5M
| $1.05M | ﹤0.01% |
68,400
+1,100
| +2% | +$27.8K |
|
2725
CALL
WisdomTree
WT
$3.69B
| $1.05M | ﹤0.01% |
61,900
-179,300
| -74% | -$3.17M |
|
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.