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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5151
MiMedx Group
MDXG
$636M
| $109K | ﹤0.01% |
17,957
+11,663
| +185% | +$77.6K |
|
|
SOLT
5152
2x Solana ETF
SOLT
$118M
| $109K | ﹤0.01% |
+332
| New | +$107K |
|
5153
CALL
Annovis Bio
ANVS
$75.3M
| $108K | ﹤0.01% |
50,100
+40,400
| +416% | +$79.7K |
|
5154
BBVA Argentina
BBAR
$4.04B
| $108K | ﹤0.01% |
6,601
+5,801
| +725% | +$111K |
|
|
DAO
5155
CALL
Youdao
DAO
$1.97B
| $108K | ﹤0.01% |
12,600
-4,700
| -27% | -$40K |
|
|
GMS
5156
CALL
DELISTED
GMS Inc
GMS
| $108K | ﹤0.01% |
+1,000
| New | +$77.4K |
|
5157
PUT
Comstock
LODE
$212M
| $108K | ﹤0.01% |
28,700
-37,800
| -57% | -$105K |
|
5158
Microvast
MVST
$267M
| $108K | ﹤0.01% |
29,880
+16,659
| +126% | +$48.7K |
|
5159
CALL
Sonoco
SON
$5.62B
| $108K | ﹤0.01% |
2,500
-3,300
| -57% | -$148K |
|
|
SUNS
5160
CALL
Sunrise Realty Trust
SUNS
$108M
| $108K | ﹤0.01% |
10,200
| – | – |
|
5161
CALL
Appian
APPN
$1.94B
| $107K | ﹤0.01% |
3,600
-3,400
| -49% | -$102K |
|
|
BASE
5162
PUT
DELISTED
Couchbase
BASE
| $107K | ﹤0.01% |
+4,400
| New | +$80K |
|
5163
PUT
Brink's
BCO
$4.84B
| $107K | ﹤0.01% |
+1,200
| New | +$104K |
|
|
CRDL
5164
CALL
Cardiol Therapeutics
CRDL
$139M
| $107K | ﹤0.01% |
79,000
-43,800
| -36% | -$51K |
|
5165
FuelCell Energy
FCEL
$1.89B
| $107K | ﹤0.01% |
+19,084
| New | +$92.6K |
|
5166
Magnachip Semiconductor
MX
$116M
| $107K | ﹤0.01% |
27,003
+11,632
| +76% | +$40.4K |
|
5167
Nu Skin
NUS
$254M
| $107K | ﹤0.01% |
13,493
+13,053
| +2,967% | +$91.6K |
|
5168
CALL
Steven Madden
SHOO
$3.5B
| $107K | ﹤0.01% |
4,500
-8,400
| -65% | -$197K |
|
5169
Yext
YEXT
$552M
| $107K | ﹤0.01% |
12,593
+8,777
| +230% | +$61.6K |
|
|
MAGN
5170
PUT
Magnera Corp
MAGN
$475M
| $107K | ﹤0.01% |
8,900
+6,900
| +345% | +$94.9K |
|
5171
Alta Equipment Group
ALTG
$197M
| $106K | ﹤0.01% |
+16,787
| New | +$85K |
|
5172
CALL
Aemetis
AMTX
$110M
| $106K | ﹤0.01% |
42,900
-9,300
| -18% | -$15.7K |
|
5173
Capital Group Core Equity ETF
CGUS
$11.2B
| $106K | ﹤0.01% |
2,886
+1,804
| +167% | +$61.5K |
|
5174
CALL
CuriosityStream
CURI
$143M
| $106K | ﹤0.01% |
18,900
-7,100
| -27% | -$32.6K |
|
5175
PUT
Dyne Therapeutics
DYN
$4.8B
| $106K | ﹤0.01% |
+11,200
| New | +$123K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.