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 | |
|---|---|---|---|---|---|---|
1901
PUT
Triumph Financial Inc
TFIN
$1.47B
| $2.27M | ﹤0.01% |
29,700
+15,800
| +114% | +$1.07M |
|
1902
Stanley Black & Decker
SWK
$13.8B
| $2.26M | ﹤0.01% |
24,062
+14,994
| +165% | +$1.17M |
|
1903
CALL
Molina Healthcare
MOH
$9.96B
| $2.26M | ﹤0.01% |
9,900
+2,500
| +34% | +$453K |
|
1904
JPMorgan Equity Premium Income ETF
JEPI
$45.7B
| $2.26M | ﹤0.01% |
40,084
+32,432
| +424% | +$1.83M |
|
1905
PUT
NiSource
NI
$18.9B
| $2.26M | ﹤0.01% |
47,600
+40,800
| +600% | +$1.93M |
|
1906
CALL
Harmonic Inc
HLIT
$1.2B
| $2.26M | ﹤0.01% |
138,500
+137,600
| +15,289% | +$1.76M |
|
|
GLXY
1907
Galaxy Digital Inc
GLXY
$4.71B
| $2.26M | ﹤0.01% |
82,567
+15,566
| +23% | +$433K |
|
|
WYFI
1908
CALL
WhiteFiber Inc
WYFI
$762M
| $2.26M | ﹤0.01% |
58,100
+3,000
| +5% | +$72.6K |
|
1909
CALL
SL Green Realty
SLG
$3.61B
| $2.26M | ﹤0.01% |
43,600
+11,200
| +35% | +$500K |
|
1910
CALL
Annaly Capital Management
NLY
$15.5B
| $2.25M | ﹤0.01% |
100,800
+27,700
| +38% | +$612K |
|
1911
PUT
Gaming and Leisure Properties
GLPI
$11.3B
| $2.25M | ﹤0.01% |
50,600
+49,400
| +4,117% | +$2.31M |
|
1912
PUT
Progressive
PGR
$119B
| $2.25M | ﹤0.01% |
10,300
+6,400
| +164% | +$1.29M |
|
1913
Frontline
FRO
$10.6B
| $2.25M | ﹤0.01% |
64,674
-7,865
| -11% | -$289K |
|
1914
PUT
ProPetro Holding
PUMP
$1.18B
| $2.25M | ﹤0.01% |
156,900
+116,300
| +286% | +$1.81M |
|
|
MUU
1915
Direxion Daily MU Bull 2X ETF
MUU
$4.55B
| $2.25M | ﹤0.01% |
+42,900
| New | +$1.22M |
|
1916
PUT
Entegris
ENTG
$23.2B
| $2.25M | ﹤0.01% |
12,500
+6,200
| +98% | +$894K |
|
1917
PUT
MasTec
MTZ
$17.1B
| $2.25M | ﹤0.01% |
5,400
+1,500
| +38% | +$573K |
|
1918
CALL
DT Midstream
DTM
$12.5B
| $2.25M | ﹤0.01% |
15,300
+14,000
| +1,077% | +$1.98M |
|
1919
CALL
Whirlpool
WHR
$2.07B
| $2.24M | ﹤0.01% |
56,900
+39,700
| +231% | +$1.86M |
|
1920
CALL
Vishay Intertechnology
VSH
$4.99B
| $2.24M | ﹤0.01% |
41,700
+39,700
| +1,985% | +$1.62M |
|
1921
Tractor Supply
TSCO
$16.8B
| $2.24M | ﹤0.01% |
70,945
+66,416
| +1,466% | +$2.3M |
|
|
DFTX
1922
Definium Therapeutics
DFTX
$4.86B
| $2.24M | ﹤0.01% |
47,651
+6,495
| +16% | +$160K |
|
1923
CALL
Otis Worldwide
OTIS
$25.1B
| $2.24M | ﹤0.01% |
31,300
+3,400
| +12% | +$254K |
|
1924
PUT
Dutch Bros
BROS
$5.23B
| $2.24M | ﹤0.01% |
31,200
-16,400
| -34% | -$941K |
|
1925
Synopsys
SNPS
$81.6B
| $2.24M | ﹤0.01% |
5,021
-1,778
| -26% | -$836K |
|
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.