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 | |
|---|---|---|---|---|---|---|
1776
Liberty Energy
LBRT
$3.09B
| $2.55M | ﹤0.01% |
97,406
+23,450
| +32% | +$701K |
|
1777
CALL
Illumina
ILMN
$40.8B
| $2.55M | ﹤0.01% |
14,500
-5,100
| -26% | -$747K |
|
1778
PUT
Goodyear
GT
$1.48B
| $2.55M | ﹤0.01% |
386,000
+102,500
| +36% | +$659K |
|
1779
PUT
BRC Group Holdings
RILY
$230M
| $2.55M | ﹤0.01% |
316,800
-93,800
| -23% | -$797K |
|
1780
CALL
MetLife
MET
$62.1B
| $2.55M | ﹤0.01% |
30,100
-30,500
| -50% | -$2.46M |
|
1781
CALL
Arrowhead Research
ARWR
$9.31B
| $2.54M | ﹤0.01% |
31,200
+11,800
| +61% | +$872K |
|
1782
Comfort Systems
FIX
$58.4B
| $2.54M | ﹤0.01% |
1,283
+896
| +232% | +$1.63M |
|
1783
CALL
Sportradar
SRAD
$3.92B
| $2.54M | ﹤0.01% |
169,700
+600
| +0.4% | +$8.73K |
|
1784
PUT
Agilon Health
AGL
$1.36B
| $2.54M | ﹤0.01% |
+23,700
| New | +$1.55M |
|
|
GTLS
1785
CALL
DELISTED
Chart Industries
GTLS
| $2.53M | ﹤0.01% |
12,100
+1,600
| +15% | +$332K |
|
1786
JD.com
JD
$35.8B
| $2.53M | ﹤0.01% |
99,211
+37,981
| +62% | +$1.12M |
|
|
SERV
1787
CALL
Serve Robotics
SERV
$386M
| $2.52M | ﹤0.01% |
383,700
+84,100
| +28% | +$702K |
|
1788
CALL
Check Point Software Technologies
CHKP
$13.4B
| $2.52M | ﹤0.01% |
19,200
+6,800
| +55% | +$884K |
|
1789
CALL
Braze
BRZE
$2.77B
| $2.52M | ﹤0.01% |
116,300
-96,800
| -45% | -$2.16M |
|
1790
Groupon
GRPN
$866M
| $2.52M | ﹤0.01% |
104,843
+71,063
| +210% | +$1.17M |
|
|
SMU
1791
PUT
Tradr 2X Long SMR Daily ETF
SMU
$174M
| $2.52M | ﹤0.01% |
23,100
+21,650
| +1,493% | +$1.1M |
|
1792
PUT
Alexandria Real Estate Equities
ARE
$8.59B
| $2.52M | ﹤0.01% |
47,600
-7,700
| -14% | -$368K |
|
1793
CALL
AES
AES
$10.6B
| $2.52M | ﹤0.01% |
171,600
-107,700
| -39% | -$1.56M |
|
1794
PUT
Levi Strauss
LEVI
$7.59B
| $2.52M | ﹤0.01% |
101,300
+26,600
| +36% | +$600K |
|
1795
PUT
Fluence Energy
FLNC
$1.12B
| $2.51M | ﹤0.01% |
126,300
-200
| -0.2% | -$3.72K |
|
1796
CALL
Blackstone Secured Lending
BXSL
$5.75B
| $2.51M | ﹤0.01% |
105,700
-5,100
| -5% | -$122K |
|
1797
CALL
Bath & Body Works
BBWI
$3.32B
| $2.5M | ﹤0.01% |
108,300
+10,300
| +11% | +$197K |
|
1798
PUT
Cleveland-Cliffs
CLF
$6.95B
| $2.5M | ﹤0.01% |
266,700
-161,000
| -38% | -$1.77M |
|
1799
CALL
Vista Energy
VIST
$7.46B
| $2.5M | ﹤0.01% |
39,200
+25,500
| +186% | +$1.79M |
|
1800
PUT
Procure Space ETF
UFO
$556M
| $2.5M | ﹤0.01% |
49,300
+48,200
| +4,382% | +$2.59M |
|
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.