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 | |
|---|---|---|---|---|---|---|
1951
PUT
ACM Research
ACMR
$5.38B
| $2.18M | ﹤0.01% |
17,200
-8,900
| -34% | -$629K |
|
1952
CALL
IAMGOLD
IAG
$11.2B
| $2.18M | ﹤0.01% |
137,500
-48,000
| -26% | -$839K |
|
1953
CALL
United States Antimony
UAMY
$674M
| $2.18M | ﹤0.01% |
299,600
-172,500
| -37% | -$1.56M |
|
1954
CALL
Dycom Industries
DY
$8.19B
| $2.17M | ﹤0.01% |
4,300
+4,200
| +4,200% | +$1.84M |
|
1955
CALL
Keysight
KEYS
$61.7B
| $2.17M | ﹤0.01% |
6,200
-2,700
| -30% | -$921K |
|
|
SEZL
1956
Sezzle
SEZL
$3.75B
| $2.17M | ﹤0.01% |
12,635
+12,385
| +4,954% | +$1.31M |
|
|
GAP
1957
PUT
The Gap Inc
GAP
$7.66B
| $2.17M | ﹤0.01% |
115,900
-5,200
| -4% | -$120K |
|
1958
CALL
Aptiv
APTV
$9.3B
| $2.16M | ﹤0.01% |
47,400
+30,100
| +174% | +$1.84M |
|
1959
CALL
Quest Diagnostics
DGX
$26.1B
| $2.16M | ﹤0.01% |
10,200
+6,000
| +143% | +$1.18M |
|
1960
Fluence Energy
FLNC
$1.12B
| $2.16M | ﹤0.01% |
108,705
+94,403
| +660% | +$1.76M |
|
1961
CALL
Liberty Media Corporation Series A Common Stock
FWONA
$21.7B
| $2.16M | ﹤0.01% |
22,800
+18,000
| +375% | +$1.48M |
|
1962
PUT
Uranium Energy
UEC
$4.66B
| $2.16M | ﹤0.01% |
202,400
+128,900
| +175% | +$1.73M |
|
1963
CALL
Aramark
ARMK
$14.5B
| $2.16M | ﹤0.01% |
37,900
+37,300
| +6,217% | +$1.84M |
|
|
JBS
1964
JBS N.V.
JBS
$38.1B
| $2.15M | ﹤0.01% |
+181,600
| New | +$2.66M |
|
|
PPLT
1965
PUT
abrdn Physical Platinum Shares ETF
PPLT
$2.17B
| $2.15M | ﹤0.01% |
152,200
+38,200
| +34% | +$664K |
|
1966
CALL
Immunic
IMUX
$128M
| $2.15M | ﹤0.01% |
139,900
+124,840
| +829% | +$1.54M |
|
1967
PUT
ALPS REIT Dividend Dogs ETF
RDOG
$10.5M
| $2.15M | ﹤0.01% |
41,400
+34,400
| +491% | +$1.37M |
|
1968
PUT
American International
AIG
$38.8B
| $2.15M | ﹤0.01% |
28,800
-40,000
| -58% | -$3.04M |
|
1969
CALL
Tenax Therapeutics
TENX
$67.7M
| $2.15M | ﹤0.01% |
+147,500
| New | +$1.88M |
|
1970
STMicroelectronics
STM
$46.3B
| $2.14M | ﹤0.01% |
28,640
+17,161
| +149% | +$1.03M |
|
|
PONY
1971
CALL
Pony AI Inc
PONY
$2.99B
| $2.14M | ﹤0.01% |
308,600
+166,400
| +117% | +$1.54M |
|
1972
CALL
Cal-Maine
CALM
$3.15B
| $2.13M | ﹤0.01% |
26,500
+2,200
| +9% | +$170K |
|
1973
CALL
Iridium Communications
IRDM
$5.17B
| $2.13M | ﹤0.01% |
38,900
+4,100
| +12% | +$175K |
|
1974
Wendy's
WEN
$1.25B
| $2.13M | ﹤0.01% |
256,869
+120,136
| +88% | +$859K |
|
|
NAVN
1975
CALL
Navan Inc
NAVN
$5.05B
| $2.12M | ﹤0.01% |
92,900
+91,900
| +9,190% | +$1.68M |
|
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.