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 | |
|---|---|---|---|---|---|---|
1051
Okta
OKTA
$34.1B
| $6.27M | ﹤0.01% |
45,957
-30,869
| -40% | -$2.9M |
|
1052
CALL
ATI
ATI
$25.3B
| $6.27M | ﹤0.01% |
31,800
-2,400
| -7% | -$407K |
|
1053
CALL
Tema ETF Trust Tema Heart & Health ETF
HRTS
$54.1M
| $6.26M | ﹤0.01% |
+206,100
| New | +$7.02M |
|
1054
State Street Technology Select Sector SPDR ETF
XLK
$127B
| $6.25M | ﹤0.01% |
32,789
+3,094
| +10% | +$529K |
|
1055
PUT
Johnson Controls International
JCI
$91B
| $6.24M | ﹤0.01% |
42,700
+1,200
| +3% | +$169K |
|
1056
CALL
Equinor
EQNR
$100B
| $6.22M | ﹤0.01% |
198,200
+6,900
| +4% | +$258K |
|
1057
CALL
Penumbra
PEN
$12.6B
| $6.22M | ﹤0.01% |
19,700
+5,800
| +42% | +$1.88M |
|
1058
PUT
TG Therapeutics
TGTX
$8.79B
| $6.21M | ﹤0.01% |
113,100
+82,400
| +268% | +$3.37M |
|
|
DOCU
1059
CALL
DocuSign
DOCU
$12.6B
| $6.21M | ﹤0.01% |
139,800
+51,000
| +57% | +$2.39M |
|
1060
CALL
Cavco Industries
CVCO
$4.29B
| $6.21M | ﹤0.01% |
10,100
+100
| +1% | +$53.1K |
|
1061
CALL
Ouster
OUST
$3.15B
| $6.2M | ﹤0.01% |
99,100
+26,200
| +36% | +$881K |
|
1062
PUT
Rubrik
RBRK
$22.7B
| $6.18M | ﹤0.01% |
77,000
+47,200
| +158% | +$2.97M |
|
|
FLY
1063
CALL
Firefly Aerospace
FLY
$4.08B
| $6.15M | ﹤0.01% |
209,300
+65,600
| +46% | +$2.45M |
|
1064
PUT
Teva Pharmaceutical Industries Limited
TEVA
$45.7B
| $6.15M | ﹤0.01% |
181,600
-149,300
| -45% | -$4.97M |
|
|
B
1065
Barrick Mining
B
$70.6B
| $6.15M | ﹤0.01% |
167,449
-130,467
| -44% | -$5.35M |
|
1066
CALL
Enviri
NVRI
$540M
| $6.14M | ﹤0.01% |
279,900
-104,400
| -27% | -$2.08M |
|
1067
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$21.6B
| $6.14M | ﹤0.01% |
52,381
+1,155
| +2% | +$135K |
|
1068
CALL
Ferrari
RACE
$72.2B
| $6.14M | ﹤0.01% |
16,500
-7,900
| -32% | -$2.75M |
|
1069
CALL
Green Plains
GPRE
$1.05B
| $6.14M | ﹤0.01% |
398,900
-3,600
| -0.9% | -$57.2K |
|
1070
CALL
Waste Management
WM
$82.7B
| $6.13M | ﹤0.01% |
27,500
-47,600
| -63% | -$10.6M |
|
|
FLG
1071
CALL
Flagstar Bank National Association
FLG
$5.13B
| $6.13M | ﹤0.01% |
410,100
-235,500
| -36% | -$3.34M |
|
1072
CALL
Realty Income
O
$52.6B
| $6.12M | ﹤0.01% |
98,700
+37,200
| +60% | +$2.32M |
|
1073
PUT
Cboe Global Markets
CBOE
$26.9B
| $6.12M | ﹤0.01% |
25,200
+19,600
| +350% | +$6M |
|
|
SEZL
1074
PUT
Sezzle
SEZL
$3.75B
| $6.11M | ﹤0.01% |
35,600
+32,400
| +1,013% | +$3.41M |
|
1075
Duolingo
DUOL
$6.71B
| $6.11M | ﹤0.01% |
53,120
+21,920
| +70% | +$2.4M |
|
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.