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 | |
|---|---|---|---|---|---|---|
2176
DoorDash
DASH
$75.3B
| $1.87M | ﹤0.01% |
7,577
-58,394
| -89% | -$11.7M |
|
2177
PUT
Unum
UNM
$13.8B
| $1.86M | ﹤0.01% |
23,100
-4,700
| -17% | -$371K |
|
2178
CALL
TechnipFMC
FTI
$30.6B
| $1.86M | ﹤0.01% |
54,100
-14,300
| -21% | -$431K |
|
2179
PUT
Titan Machinery
TITN
$466M
| $1.86M | ﹤0.01% |
93,900
-20,600
| -18% | -$377K |
|
2180
CALL
MKS Inc
MKSI
$22.2B
| $1.86M | ﹤0.01% |
18,700
+13,300
| +246% | +$1.08M |
|
2181
CALL
Allegiant Air
ALGT
$2.64B
| $1.86M | ﹤0.01% |
33,800
+5,300
| +19% | +$273K |
|
2182
CALL
Levi Strauss
LEVI
$9.44B
| $1.85M | ﹤0.01% |
100,300
+54,100
| +117% | +$900K |
|
2183
PUT
iQIYI
IQ
$1.18B
| $1.85M | ﹤0.01% |
1,046,600
-88,400
| -8% | -$159K |
|
2184
CALL
Banco Bradesco
BBD
$38.1B
| $1.85M | ﹤0.01% |
598,200
+122,600
| +26% | +$322K |
|
2185
PUT
Franklin Resources
BEN
$16.9B
| $1.85M | ﹤0.01% |
77,500
-75,900
| -49% | -$1.56M |
|
|
EH
2186
EHang Holdings
EH
$372M
| $1.84M | ﹤0.01% |
106,291
-13,908
| -12% | -$236K |
|
2187
CALL
Xcel Energy
XEL
$51B
| $1.84M | ﹤0.01% |
27,100
+3,500
| +15% | +$243K |
|
2188
CALL
Brown-Forman Class B
BF.B
$12B
| $1.84M | ﹤0.01% |
68,400
-24,800
| -27% | -$796K |
|
2189
CALL
SEALSQ Corp
LAES
$541M
| $1.84M | ﹤0.01% |
456,500
+338,200
| +286% | +$1.04M |
|
2190
CALL
Upwork
UPWK
$1.09B
| $1.84M | ﹤0.01% |
136,900
+102,000
| +292% | +$1.46M |
|
2191
CALL
Macy's
M
$6.15B
| $1.84M | ﹤0.01% |
157,600
-232,400
| -60% | -$2.69M |
|
2192
Noble Corp
NE
$6.9B
| $1.83M | ﹤0.01% |
69,143
-3,418
| -5% | -$82K |
|
|
UNIT
2193
PUT
Uniti Group
UNIT
$2.63B
| $1.83M | ﹤0.01% |
424,800
-37,200
| -8% | -$167K |
|
2194
PUT
Freshpet
FRPT
$2.83B
| $1.83M | ﹤0.01% |
27,000
-10,300
| -28% | -$805K |
|
2195
PUT
United Natural Foods
UNFI
$3.01B
| $1.83M | ﹤0.01% |
78,700
-15,800
| -17% | -$412K |
|
2196
CALL
SELLAS Life Sciences
SLS
$2.23B
| $1.83M | ﹤0.01% |
835,000
+357,400
| +75% | +$549K |
|
|
LAC
2197
CALL
Lithium Americas
LAC
$986M
| $1.83M | ﹤0.01% |
682,000
+113,400
| +20% | +$314K |
|
2198
CALL
JetBlue
JBLU
$1.96B
| $1.83M | ﹤0.01% |
431,800
-94,900
| -18% | -$425K |
|
2199
PUT
Dominion Energy
D
$62.5B
| $1.82M | ﹤0.01% |
32,300
-47,000
| -59% | -$2.58M |
|
2200
PUT
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $1.82M | ﹤0.01% |
29,600
-117,100
| -80% | -$3.19M |
|
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.