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 | |
|---|---|---|---|---|---|---|
3976
PUT
CoStar Group
CSGP
$10.9B
| $371K | ﹤0.01% |
13,100
-21,400
| -62% | -$736K |
|
3977
PUT
New York Times
NYT
$10.3B
| $371K | ﹤0.01% |
5,300
-18,100
| -77% | -$1.4M |
|
|
SSPC
3978
Leverage Shares 2X Short SPCX Daily ETF
SSPC
$90.5M
| $371K | ﹤0.01% |
+36,171
| New | +$400K |
|
3979
PUT
Leidos
LDOS
$15.4B
| $371K | ﹤0.01% |
3,600
+3,400
| +1,700% | +$451K |
|
3980
Mercury Insurance
MCY
$5.48B
| $370K | ﹤0.01% |
+3,474
| New | +$342K |
|
3981
Kaspi.kz JSC
KSPI
$18.2B
| $370K | ﹤0.01% |
4,267
+2,238
| +110% | +$190K |
|
|
PPTA
3982
Perpetua Resources
PPTA
$2.73B
| $369K | ﹤0.01% |
17,794
-5,399
| -23% | -$146K |
|
|
AWTM
3983
CALL
DELISTED
AWTM Ultra-Short Duration Enhanced Income ETF
AWTM
| $369K | ﹤0.01% |
12,700
-53,200
| -81% | -$1.55M |
|
3984
PUT
Tompkins Financial
TMP
$1.41B
| $369K | ﹤0.01% |
3,900
+2,200
| +129% | +$189K |
|
3985
CALL
Scholar Rock
SRRK
$5.98B
| $369K | ﹤0.01% |
6,700
-900
| -12% | -$43.5K |
|
3986
Bowman Consulting
BWMN
$739M
| $368K | ﹤0.01% |
12,619
+2,034
| +19% | +$64.1K |
|
3987
CALL
Capital Southwest
CSWC
$1.47B
| $368K | ﹤0.01% |
15,500
+11,800
| +319% | +$276K |
|
3988
Triumph Financial Inc
TFIN
$1.45B
| $368K | ﹤0.01% |
4,826
+2,065
| +75% | +$140K |
|
3989
BioCryst Pharmaceuticals
BCRX
$2.16B
| $368K | ﹤0.01% |
36,794
-17,171
| -32% | -$155K |
|
3990
iShares US Transportation ETF
IYT
$2.04B
| $366K | ﹤0.01% |
+4,220
| New | +$345K |
|
3991
CALL
Chord Energy
CHRD
$7.39B
| $366K | ﹤0.01% |
3,200
+600
| +23% | +$81.4K |
|
|
GEMI
3992
CALL
Gemini Space Station
GEMI
$674M
| $366K | ﹤0.01% |
85,800
-14,200
| -14% | -$66.9K |
|
3993
CALL
Sidus Space
SIDU
$203M
| $364K | ﹤0.01% |
129,500
+35,100
| +37% | +$135K |
|
3994
Haleon
HLN
$40.3B
| $363K | ﹤0.01% |
38,857
+29,935
| +336% | +$278K |
|
|
MRLN
3995
PUT
Merlin Inc
MRLN
$177M
| $362K | ﹤0.01% |
+63,700
| New | +$539K |
|
3996
State Street Real Estate Select Sector SPDR ETF
XLRE
$7.64B
| $362K | ﹤0.01% |
+8,225
| New | +$362K |
|
3997
Richardson Electronics
RELL
$254M
| $362K | ﹤0.01% |
19,033
+1,058
| +6% | +$16.5K |
|
|
PS
3998
PUT
Pershing Square
PS
$23.7B
| $361K | ﹤0.01% |
+11,000
| New | +$400K |
|
3999
PUT
Ambev
ABEV
$44.2B
| $361K | ﹤0.01% |
115,000
-100
| -0.1% | -$313 |
|
4000
Evertec
EVTC
$1.64B
| $360K | ﹤0.01% |
12,973
+11,163
| +617% | +$297K |
|
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.