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 | |
|---|---|---|---|---|---|---|
1551
PUT
AngloGold Ashanti
AU
$50.1B
| $3.28M | ﹤0.01% |
40,600
-31,300
| -44% | -$2.97M |
|
1552
Opendoor
OPEN
$2.5B
| $3.28M | ﹤0.01% |
761,221
+492,071
| +183% | +$2.35M |
|
|
TIGR
1553
CALL
UP Fintech Holding
TIGR
$834M
| $3.28M | ﹤0.01% |
745,300
+216,800
| +41% | +$1.26M |
|
1554
PUT
FTAI Aviation
FTAI
$18B
| $3.27M | ﹤0.01% |
12,100
-2,100
| -15% | -$528K |
|
1555
PUT
Ormat Technologies
ORA
$5.76B
| $3.27M | ﹤0.01% |
30,000
+24,000
| +400% | +$2.97M |
|
1556
PUT
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$125M
| $3.27M | ﹤0.01% |
146,300
-21,300
| -13% | -$579K |
|
1557
Vale
VALE
$57.9B
| $3.26M | ﹤0.01% |
217,034
-40,111
| -16% | -$653K |
|
1558
Elevance Health
ELV
$85.9B
| $3.25M | ﹤0.01% |
+8,408
| New | +$3.12M |
|
1559
PUT
Conagra Brands
CAG
$6.87B
| $3.25M | ﹤0.01% |
241,500
+98,800
| +69% | +$1.38M |
|
|
MDLN
1560
CALL
Medline Inc
MDLN
$30.4B
| $3.25M | ﹤0.01% |
82,300
-25,300
| -24% | -$1.02M |
|
1561
Quanta Services
PWR
$97.6B
| $3.24M | ﹤0.01% |
+4,500
| New | +$3.08M |
|
1562
PUT
Macy's
M
$5.91B
| $3.23M | ﹤0.01% |
137,300
-49,900
| -27% | -$1.04M |
|
|
EXE
1563
PUT
Expand Energy Corp
EXE
$20.1B
| $3.23M | ﹤0.01% |
35,400
+20,100
| +131% | +$1.91M |
|
1564
PUT
Aon
AON
$59B
| $3.22M | ﹤0.01% |
+9,700
| New | +$3.13M |
|
1565
PUT
Trip.com Group
TCOM
$24.8B
| $3.22M | ﹤0.01% |
80,700
-3,100
| -4% | -$154K |
|
|
QNT
1566
CALL
Quantinuum Inc
QNT
$1.94B
| $3.21M | ﹤0.01% |
+39,300
| New | +$2.53M |
|
1567
PUT
ASE Group
ASX
$115B
| $3.21M | ﹤0.01% |
71,100
+70,600
| +14,120% | +$2.37M |
|
|
FISV
1568
Fiserv Inc
FISV
$24.7B
| $3.2M | ﹤0.01% |
+65,339
| New | +$3.65M |
|
1569
iShares Silver Trust
SLV
$31.3B
| $3.2M | ﹤0.01% |
+59,816
| New | +$3.97M |
|
1570
CALL
Innodata
INOD
$2.38B
| $3.2M | ﹤0.01% |
42,300
+24,100
| +132% | +$1.77M |
|
|
TUZ
1571
CALL
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $3.19M | ﹤0.01% |
50,500
+48,900
| +3,056% | +$3.09M |
|
1572
CALL
Antero Midstream
AM
$9.93B
| $3.19M | ﹤0.01% |
140,200
+92,600
| +195% | +$2.01M |
|
1573
CALL
Baxter International
BAX
$12.1B
| $3.19M | ﹤0.01% |
149,500
-66,700
| -31% | -$1.24M |
|
1574
CALL
Mitek Systems
MITK
$797M
| $3.18M | ﹤0.01% |
158,100
+79,400
| +101% | +$1.23M |
|
1575
PUT
Chewy
CHWY
$7.34B
| $3.17M | ﹤0.01% |
161,300
-110,700
| -41% | -$2.51M |
|
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.