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 | |
|---|---|---|---|---|---|---|
951
Eos Energy Enterprises
EOSE
$1.15B
| $7.3M | ﹤0.01% |
1,240,664
+256,335
| +26% | +$1.78M |
|
952
Baidu
BIDU
$29.8B
| $7.29M | ﹤0.01% |
+63,798
| New | +$7.9M |
|
|
FIG
953
CALL
Figma
FIG
$11.1B
| $7.28M | ﹤0.01% |
402,300
+47,700
| +13% | +$960K |
|
954
PUT
Vanguard Consumer Discretionary ETF
VCR
$5.72B
| $7.27M | ﹤0.01% |
57,800
+49,300
| +580% | +$19.2M |
|
955
PUT
ResMed
RMD
$32B
| $7.27M | ﹤0.01% |
37,300
+31,600
| +554% | +$6.55M |
|
956
CALL
TechnipFMC
FTI
$27.8B
| $7.27M | ﹤0.01% |
109,600
+1,400
| +1% | +$99.1K |
|
957
CALL
Plains All American Pipeline
PAA
$17.2B
| $7.27M | ﹤0.01% |
326,400
-368,900
| -53% | -$8.2M |
|
958
CALL
Stryker
SYK
$104B
| $7.21M | ﹤0.01% |
22,900
+2,500
| +12% | +$788K |
|
959
CALL
RH
RH
$2.35B
| $7.2M | ﹤0.01% |
43,700
+4,700
| +12% | +$648K |
|
960
PUT
Fluor
FLR
$6.74B
| $7.15M | ﹤0.01% |
136,500
-22,700
| -14% | -$1.11M |
|
961
PUT
Best Buy
BBY
$19B
| $7.15M | ﹤0.01% |
94,200
+8,800
| +10% | +$585K |
|
962
CALL
QuantumScape Corp
QS
$3.02B
| $7.14M | ﹤0.01% |
943,800
+144,100
| +18% | +$1.08M |
|
963
CALL
Lumen
LUMN
$5.89B
| $7.12M | ﹤0.01% |
927,600
+224,500
| +32% | +$1.97M |
|
964
CALL
Alcoa
AA
$11.3B
| $7.11M | ﹤0.01% |
136,300
-135,500
| -50% | -$9.07M |
|
965
CALL
Genmab
GMAB
$21.7B
| $7.1M | ﹤0.01% |
258,300
+156,100
| +153% | +$4.15M |
|
966
PUT
SELLAS Life Sciences
SLS
$2.34B
| $7.09M | ﹤0.01% |
480,500
+327,100
| +213% | +$2.26M |
|
967
PUT
AstraZeneca
AZN
$258B
| $7.09M | ﹤0.01% |
37,400
+11,600
| +45% | +$2.18M |
|
968
PUT
Lemonade
LMND
$3.48B
| $7.08M | ﹤0.01% |
108,800
+37,600
| +53% | +$2.2M |
|
969
PUT
Tractor Supply
TSCO
$16.8B
| $7.07M | ﹤0.01% |
223,600
+207,200
| +1,263% | +$7.16M |
|
|
EH
970
CALL
EHang Holdings
EH
$342M
| $7.06M | ﹤0.01% |
1,077,200
+321,600
| +43% | +$3M |
|
|
XOVR
971
CALL
EntrepreneurShares Series Trust ERShares Private-Public Crossover ETF
XOVR
$1.52B
| $7.04M | ﹤0.01% |
+334,600
| New | +$6.39M |
|
972
CALL
Copart
CPRT
$25.5B
| $7.02M | ﹤0.01% |
249,200
+27,200
| +12% | +$878K |
|
973
PUT
Dollar Tree
DLTR
$21.4B
| $7.02M | ﹤0.01% |
58,000
-27,700
| -32% | -$2.88M |
|
974
CALL
Atlassian
TEAM
$47.5B
| $7.01M | ﹤0.01% |
90,100
-10,000
| -10% | -$818K |
|
975
CALL
e.l.f. Beauty
ELF
$5.87B
| $6.97M | ﹤0.01% |
94,200
+37,800
| +67% | +$2.3M |
|
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.