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 | |
|---|---|---|---|---|---|---|
1926
PUT
BILL Holdings
BILL
$3.77B
| $2.24M | ﹤0.01% |
61,900
+53,900
| +674% | +$1.99M |
|
|
NNE
1927
CALL
Nano Nuclear Energy
NNE
$912M
| $2.23M | ﹤0.01% |
105,600
+13,800
| +15% | +$340K |
|
1928
PUT
General Dynamics
GD
$91.1B
| $2.23M | ﹤0.01% |
6,300
-1,100
| -15% | -$377K |
|
1929
CALL
Aurinia Pharmaceuticals
AUPH
$2.19B
| $2.23M | ﹤0.01% |
131,400
+66,200
| +102% | +$1.06M |
|
1930
PUT
Copart
CPRT
$25.5B
| $2.23M | ﹤0.01% |
79,100
+7,000
| +10% | +$226K |
|
1931
CALL
PureCycle Technologies
PCT
$1.01B
| $2.23M | ﹤0.01% |
274,400
-820,200
| -75% | -$7.35M |
|
1932
CALL
Performance Food Group
PFGC
$14.4B
| $2.22M | ﹤0.01% |
19,900
+1,400
| +8% | +$133K |
|
1933
PUT
Ramaco Resources Class A
METC
$574M
| $2.22M | ﹤0.01% |
168,000
+6,800
| +4% | +$99.1K |
|
1934
PUT
JetBlue
JBLU
$1.66B
| $2.22M | ﹤0.01% |
387,000
-553,400
| -59% | -$2.82M |
|
1935
PUT
Stellantis
STLA
$13.3B
| $2.22M | ﹤0.01% |
386,000
-260,700
| -40% | -$1.93M |
|
1936
Ascendis Pharma A/S
ASND
$14.8B
| $2.21M | ﹤0.01% |
+8,275
| New | +$1.93M |
|
1937
PUT
Maplebear
CART
$10B
| $2.21M | ﹤0.01% |
46,600
+26,300
| +130% | +$1.1M |
|
1938
PUT
MACOM Technology Solutions
MTSI
$21.8B
| $2.21M | ﹤0.01% |
5,800
+1,600
| +38% | +$531K |
|
1939
PUT
NetEase
NTES
$73.9B
| $2.2M | ﹤0.01% |
17,200
+5,700
| +50% | +$673K |
|
1940
PUT
IQVIA
IQV
$44.5B
| $2.2M | ﹤0.01% |
+11,400
| New | +$1.99M |
|
1941
CALL
BCE
BCE
$19.6B
| $2.2M | ﹤0.01% |
102,300
+14,300
| +16% | +$343K |
|
1942
CALL
Primoris Services
PRIM
$3.91B
| $2.2M | ﹤0.01% |
22,200
+20,600
| +1,288% | +$2.71M |
|
1943
CALL
Yum China
YUMC
$13.7B
| $2.2M | ﹤0.01% |
53,800
-6,000
| -10% | -$275K |
|
1944
CALL
Thomson Reuters
TRI
$42.9B
| $2.2M | ﹤0.01% |
26,900
+23,749
| +754% | +$2.07M |
|
1945
PUT
Crown Castle
CCI
$28.9B
| $2.2M | ﹤0.01% |
29,000
-11,300
| -28% | -$993K |
|
1946
BellRing Brands
BRBR
$920M
| $2.19M | ﹤0.01% |
169,387
-21,049
| -11% | -$254K |
|
1947
CALL
Compass
COMP
$7.2B
| $2.19M | ﹤0.01% |
177,700
-54,200
| -23% | -$451K |
|
1948
CALL
Amcor
AMCR
$19.7B
| $2.19M | ﹤0.01% |
50,500
-306,200
| -86% | -$12.2M |
|
1949
CALL
Aon
AON
$59B
| $2.19M | ﹤0.01% |
6,600
-500
| -7% | -$161K |
|
|
FRMM
1950
CALL
Forum Markets
FRMM
$66.5M
| $2.19M | ﹤0.01% |
403,100
+2,300
| +0.6% | +$10.1K |
|
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.