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 | Held Since | |
|---|---|---|---|---|---|---|---|
8976
Ridgepost Capital
RPC
$957M
| $401 | ﹤0.01% |
51
-825
| -94% | -$6.57K |
2025 Q2
4 quarters
|
|
8977
Sohu.com
SOHU
$329M
| $399 | ﹤0.01% |
+33
| New | +$473 |
2026 Q2
0 quarters
|
|
8978
Summit Midstream
SMC
$430M
| $398 | ﹤0.01% |
+14
| New | +$418 |
2026 Q2
0 quarters
|
|
8979
CALL
Adicet Bio
ACET
$37.4M
| $397 | ﹤0.01% |
1,700
-100
| -6% | -$788 |
2025 Q4
2 quarters
|
|
8980
Matthews Korea Active ETF
MKOR
$122M
| $397 | ﹤0.01% |
+6
| New | +$358 |
2026 Q2
0 quarters
|
|
8981
Direxion Daily Pharmaceutical & Medical Bull 3X ETF
PILL
$14.6M
| $397 | ﹤0.01% |
22
-98
| -82% | -$1.25K |
2025 Q4
2 quarters
|
|
8982
State Street SPDR ICE Preferred Securities ETF
PSK
$631M
| $396 | ﹤0.01% |
+13
| New | +$404 |
2026 Q2
0 quarters
|
|
8983
PUT
Werewolf Therapeutics
HOWL
$47.6M
| $395 | ﹤0.01% |
+1,100
| New | +$670 |
2026 Q2
0 quarters
|
|
8984
Leverage Shares 2X Long AMAT Daily ETF
AMAU
$10.8M
| $395 | ﹤0.01% |
+11
| New | +$221 |
2026 Q2
0 quarters
|
|
8985
PUT
Neuronetics
STIM
$161M
| $390 | ﹤0.01% |
300
-1,700
| -85% | -$2.47K |
2025 Q1
5 quarters
|
|
8986
Investcorp Credit Management BDC
ICMB
$10.1M
| $389 | ﹤0.01% |
+333
| New | +$496 |
2026 Q2
0 quarters
|
|
8987
CALL
MiMedx Group
MDXG
$571M
| $385 | ﹤0.01% |
100
-4,300
| -98% | -$15.7K |
2021 Q1
21 quarters
|
|
8988
Defiance Daily Target 2x Short IONQ ETF
IONZ
$3.45M
| $380 | ﹤0.01% |
15
+14
| +1,400% | +$949 |
2025 Q4
2 quarters
|
|
8989
PUT
CoinShares PLC
CSHR
$517M
| $377 | ﹤0.01% |
+100
| New | +$526 |
2026 Q2
0 quarters
|
|
8990
TriCo Bancshares
TCBK
$1.69B
| $376 | ﹤0.01% |
7
-1
| -13% | -$51 |
2025 Q4
2 quarters
|
|
8991
Jiayin Group
JFIN
$67.5M
| $374 | ﹤0.01% |
+131
| New | +$557 |
2026 Q2
0 quarters
|
|
8992
PUT
Black Diamond Therapeutics
BDTX
$108M
| $370 | ﹤0.01% |
200
-1,300
| -87% | -$3.18K |
2026 Q1
1 quarter
|
|
8993
CALL
IZEA Worldwide
IZEA
$39.9M
| $370 | ﹤0.01% |
+100
| New | +$390 |
2026 Q2
0 quarters
|
|
8994
YieldMax MARA Option Income Strategy ETF
MARO
$37.1M
| $367 | ﹤0.01% |
+60
| New | +$378 |
2026 Q2
0 quarters
|
|
8995
PUT
Fold Holdings
FLD
$28.2M
| $362 | ﹤0.01% |
800
-5,700
| -88% | -$6.15K |
2025 Q3
3 quarters
|
|
8996
DELISTED
Sleep Number
SNBR
| $360 | ﹤0.01% |
+15,038
| New | +$25.2K |
2026 Q2
0 quarters
|
|
8997
CALL
TechTarget
TTGT
$268M
| $360 | ﹤0.01% |
100
-500
| -83% | -$2.29K |
2026 Q1
1 quarter
|
|
8998
The Joint Corp
JYNT
$102M
| $359 | ﹤0.01% |
+41
| New | +$362 |
2026 Q2
0 quarters
|
|
8999
CALL
OFS Capital
OFS
$52.7M
| $354 | ﹤0.01% |
100
-600
| -86% | -$2.2K |
2021 Q4
18 quarters
|
|
9000
YieldMax AI Option Income Strategy ETF
AIYY
$48.4M
| $344 | ﹤0.01% |
42
-231
| -85% | -$2.22K |
2025 Q2
4 quarters
|
|
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.