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 | |
|---|---|---|---|---|---|---|
2326
CALL
ASP Isotopes
ASPI
$448M
| $1.5M | ﹤0.01% |
241,000
-69,100
| -22% | -$407K |
|
2327
CALL
Travel + Leisure Co
TNL
$3.9B
| $1.5M | ﹤0.01% |
19,600
+300
| +2% | +$21.1K |
|
2328
CALL
Dropbox
DBX
$7.03B
| $1.49M | ﹤0.01% |
54,400
+46,900
| +625% | +$1.21M |
|
2329
PUT
Blackstone Secured Lending
BXSL
$5.75B
| $1.49M | ﹤0.01% |
63,000
-48,300
| -43% | -$1.15M |
|
|
EMBJ
2330
PUT
Embraer S.A. ADS
EMBJ
$14B
| $1.49M | ﹤0.01% |
23,400
+2,500
| +12% | +$153K |
|
2331
PUT
Liberty Energy
LBRT
$3.09B
| $1.49M | ﹤0.01% |
57,000
-81,600
| -59% | -$2.44M |
|
2332
PUT
Tenaris
TS
$28B
| $1.49M | ﹤0.01% |
26,900
+4,900
| +22% | +$298K |
|
2333
Corcept Therapeutics
CORT
$12.6B
| $1.49M | ﹤0.01% |
17,166
-52,349
| -75% | -$3.16M |
|
2334
Alcoa
AA
$11.3B
| $1.49M | ﹤0.01% |
28,589
+23,538
| +466% | +$1.58M |
|
2335
PUT
Emerson Electric
EMR
$88.3B
| $1.49M | ﹤0.01% |
10,400
-4,000
| -28% | -$563K |
|
2336
CALL
FIGS
FIGS
$2.23B
| $1.48M | ﹤0.01% |
145,000
-12,000
| -8% | -$158K |
|
2337
CALL
USA Compression Partners
USAC
$3.7B
| $1.48M | ﹤0.01% |
56,200
+50,000
| +806% | +$1.38M |
|
2338
PUT
Contango Silver & Gold Inc
CTGO
$620M
| $1.48M | ﹤0.01% |
93,800
-31,600
| -25% | -$651K |
|
2339
CALL
Agios Pharmaceuticals
AGIO
$1.95B
| $1.48M | ﹤0.01% |
39,900
+33,500
| +523% | +$1.02M |
|
|
BRUN
2340
CALL
Boost Run Inc
BRUN
$1.33B
| $1.48M | ﹤0.01% |
+38,100
| New | +$1.18M |
|
2341
Bilibili
BILI
$6.13B
| $1.48M | ﹤0.01% |
86,652
+18,207
| +27% | +$369K |
|
2342
CALL
Ball Corp
BALL
$15B
| $1.47M | ﹤0.01% |
23,600
+700
| +3% | +$41.2K |
|
2343
Conagra Brands
CAG
$6.87B
| $1.47M | ﹤0.01% |
+109,352
| New | +$1.53M |
|
2344
CALL
Mattel
MAT
$3.8B
| $1.47M | ﹤0.01% |
106,000
+46,700
| +79% | +$683K |
|
2345
Photronics
PLAB
$1.79B
| $1.47M | ﹤0.01% |
45,187
+39,561
| +703% | +$1.67M |
|
2346
CALL
Noble Corp
NE
$6.84B
| $1.47M | ﹤0.01% |
39,400
+21,300
| +118% | +$1.02M |
|
2347
CALL
Alpha and Omega Semiconductor
AOSL
$845M
| $1.47M | ﹤0.01% |
31,000
+8,100
| +35% | +$325K |
|
2348
Fox Class A
FOXA
$26.6B
| $1.47M | ﹤0.01% |
+28,117
| New | +$1.74M |
|
|
SUPV
2349
PUT
Grupo Supervielle
SUPV
$634M
| $1.47M | ﹤0.01% |
151,700
+8,200
| +6% | +$75.9K |
|
2350
Campbell Soup
CPB
$5.78B
| $1.46M | ﹤0.01% |
65,608
+20,431
| +45% | +$431K |
|
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.