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 | |
|---|---|---|---|---|---|---|
3526
VanEck Agribusiness ETF
MOO
$1.19B
| $531K | ﹤0.01% |
6,707
+2,024
| +43% | +$165K |
|
3527
CALL
Corvus Pharmaceuticals
CRVS
$999M
| $530K | ﹤0.01% |
35,500
-33,500
| -49% | -$465K |
|
3528
Arbor Realty Trust
ABR
$761M
| $530K | ﹤0.01% |
97,814
+48,891
| +100% | +$318K |
|
3529
PUT
Fidelity National Information Services
FIS
$17.7B
| $529K | ﹤0.01% |
13,600
-1,100
| -7% | -$47.6K |
|
3530
Digital Turbine
APPS
$1.36B
| $529K | ﹤0.01% |
40,972
-2,639
| -6% | -$15.8K |
|
3531
Vanguard World Funds Extended Duration ETF
EDV
$3.52B
| $528K | ﹤0.01% |
+8,120
| New | +$519K |
|
|
DFDV
3532
PUT
DeFi Development Corp
DFDV
$182M
| $528K | ﹤0.01% |
194,000
-43,300
| -18% | -$166K |
|
3533
CALL
Ferrovial N.V. Ordinary Shares
FER
$40.2B
| $528K | ﹤0.01% |
7,700
-6,031
| -44% | -$412K |
|
3534
CALL
Tradeweb Markets
TW
$21.3B
| $528K | ﹤0.01% |
5,300
-700
| -12% | -$75.9K |
|
3535
PUT
Kinsale Capital Group
KNSL
$7.4B
| $528K | ﹤0.01% |
1,600
-1,000
| -38% | -$322K |
|
3536
CALL
Humacyte
HUMA
$152M
| $527K | ﹤0.01% |
676,200
-3,200
| -0.5% | -$2.96K |
|
3537
CALL
Ring Energy
REI
$341M
| $527K | ﹤0.01% |
488,300
+295,600
| +153% | +$412K |
|
3538
M&T Bank
MTB
$31.8B
| $527K | ﹤0.01% |
2,213
-3,929
| -64% | -$859K |
|
3539
Rezolute
RZLT
$404M
| $526K | ﹤0.01% |
101,243
+66,116
| +188% | +$246K |
|
3540
State Street SPDR S&P Semiconductor ETF
XSD
$3.09B
| $526K | ﹤0.01% |
+844
| New | +$442K |
|
|
GRAL
3541
PUT
GRAIL Inc
GRAL
$5.92B
| $526K | ﹤0.01% |
7,700
-1,400
| -15% | -$82.4K |
|
3542
CALL
United Parks & Resorts
PRKS
$1.45B
| $525K | ﹤0.01% |
+11,000
| New | +$427K |
|
3543
CALL
Waters Corp
WAT
$43.5B
| $525K | ﹤0.01% |
+1,400
| New | +$478K |
|
3544
PUT
Cohu
COHU
$3.13B
| $525K | ﹤0.01% |
7,100
+2,000
| +39% | +$100K |
|
3545
Iovance Biotherapeutics
IOVA
$4.98B
| $525K | ﹤0.01% |
126,107
-25,724
| -17% | -$97.7K |
|
3546
PUT
Heritage Financial
HFWA
$1.15B
| $524K | ﹤0.01% |
17,700
+17,600
| +17,600% | +$484K |
|
3547
Spectrum Brands
SPB
$1.9B
| $524K | ﹤0.01% |
6,112
-1,899
| -24% | -$154K |
|
3548
MSC Industrial Direct
MSM
$6.82B
| $524K | ﹤0.01% |
4,406
+4,344
| +7,006% | +$461K |
|
3549
CALL
Fiverr
FVRR
$308M
| $523K | ﹤0.01% |
50,700
-15,900
| -24% | -$169K |
|
3550
PUT
Itaú Unibanco
ITUB
$88.1B
| $523K | ﹤0.01% |
64,000
-2,600
| -4% | -$21.5K |
|
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.