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 | |
|---|---|---|---|---|---|---|
1651
CALL
Century Aluminum
CENX
$3.8B
| $2.92M | ﹤0.01% |
63,400
-27,800
| -30% | -$1.67M |
|
1652
PUT
Amer Sports
AS
$16.2B
| $2.92M | ﹤0.01% |
86,200
+53,400
| +163% | +$1.87M |
|
1653
CALL
Iron Mountain
IRM
$33.2B
| $2.91M | ﹤0.01% |
23,000
+15,300
| +199% | +$1.88M |
|
1654
PUT
Monolithic Power Systems
MPWR
$67.2B
| $2.9M | ﹤0.01% |
2,100
-200
| -9% | -$300K |
|
1655
Tenable Holdings
TENB
$3.69B
| $2.9M | ﹤0.01% |
+78,691
| New | +$1.85M |
|
1656
CALL
WIX.com
WIX
$3.09B
| $2.9M | ﹤0.01% |
63,900
+23,600
| +59% | +$1.46M |
|
1657
CALL
Jefferies Financial Group
JEF
$11B
| $2.9M | ﹤0.01% |
58,000
+7,900
| +16% | +$407K |
|
1658
Zscaler
ZS
$31.5B
| $2.9M | ﹤0.01% |
20,512
-7,500
| -27% | -$1.05M |
|
1659
CALL
Transmedics
TMDX
$2.96B
| $2.89M | ﹤0.01% |
43,500
+32,100
| +282% | +$2.72M |
|
1660
CALL
Match Group
MTCH
$9.31B
| $2.89M | ﹤0.01% |
75,900
+14,200
| +23% | +$503K |
|
1661
PUT
Alkami Technology
ALKT
$1.48B
| $2.89M | ﹤0.01% |
159,300
+36,800
| +30% | +$607K |
|
1662
CALL
XP
XP
$10.4B
| $2.88M | ﹤0.01% |
177,000
-127,300
| -42% | -$2.27M |
|
1663
PUT
Sibanye-Stillwater
SBSW
$7.51B
| $2.87M | ﹤0.01% |
338,600
+58,200
| +21% | +$679K |
|
1664
PUT
ArcelorMittal
MT
$53.2B
| $2.87M | ﹤0.01% |
47,700
-16,400
| -26% | -$1.03M |
|
1665
CALL
Elastic
ESTC
$9.25B
| $2.86M | ﹤0.01% |
50,100
+12,500
| +33% | +$670K |
|
1666
PUT
Royal Bank of Canada
RY
$280B
| $2.86M | ﹤0.01% |
13,800
-14,700
| -52% | -$2.73M |
|
1667
CALL
Allstate
ALL
$57.6B
| $2.86M | ﹤0.01% |
12,000
+5,100
| +74% | +$1.11M |
|
1668
The Kraft Heinz Company
KHC
$28B
| $2.85M | ﹤0.01% |
+120,478
| New | +$2.78M |
|
1669
Benchmark Electronics
BHE
$2.96B
| $2.85M | ﹤0.01% |
+28,840
| New | +$2.3M |
|
1670
PUT
Carlyle Group
CG
$14.3B
| $2.84M | ﹤0.01% |
67,500
+28,500
| +73% | +$1.34M |
|
|
BAND
1671
Bandwidth Inc
BAND
$1.99B
| $2.84M | ﹤0.01% |
44,860
+44,794
| +67,870% | +$2.01M |
|
1672
CALL
Teladoc Health
TDOC
$1.11B
| $2.83M | ﹤0.01% |
334,200
-113,400
| -25% | -$755K |
|
|
SHAZ
1673
CALL
SharonAI Holdings
SHAZ
$1.96B
| $2.83M | ﹤0.01% |
+33,400
| New | +$1.88M |
|
|
HUCK
1674
CALL
Huckleberry.ai, Inc. Class B Common Stock
HUCK
$159M
| $2.83M | ﹤0.01% |
903,400
+902,700
| +128,957% | +$3.02M |
|
1675
CALL
PTC Therapeutics
PTCT
$5.23B
| $2.82M | ﹤0.01% |
34,600
+27,000
| +355% | +$1.95M |
|
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.