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 | |
|---|---|---|---|---|---|---|
2076
CALL
Rush Street Interactive
RSI
$3.24B
| $2.06M | ﹤0.01% |
138,500
+91,700
| +196% | +$1.14M |
|
2077
Grab
GRAB
$13.5B
| $2.06M | ﹤0.01% |
410,123
-185,895
| -31% | -$867K |
|
2078
Nucor
NUE
$56.4B
| $2.06M | ﹤0.01% |
15,919
+7,860
| +98% | +$918K |
|
2079
CALL
Galicia Financial Group
GGAL
$7.92B
| $2.06M | ﹤0.01% |
40,900
+18,800
| +85% | +$1.08M |
|
2080
PUT
Maplebear
CART
$9.92B
| $2.06M | ﹤0.01% |
45,500
-32,600
| -42% | -$1.42M |
|
2081
CALL
Corebridge Financial
CRBG
$14.1B
| $2.06M | ﹤0.01% |
57,900
+3,300
| +6% | +$103K |
|
|
CHYM
2082
CALL
Chime Financial
CHYM
$7.88B
| $2.05M | ﹤0.01% |
+59,500
| New | +$1.96M |
|
2083
CALL
Donaldson
DCI
$10.8B
| $2.05M | ﹤0.01% |
29,600
+19,900
| +205% | +$1.34M |
|
2084
CALL
Parsons
PSN
$6.28B
| $2.05M | ﹤0.01% |
28,600
-15,300
| -35% | -$1.01M |
|
2085
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $2.05M | ﹤0.01% |
76,204
+53,555
| +236% | +$1.47M |
|
2086
Spotify
SPOT
$99.2B
| $2.05M | ﹤0.01% |
+2,667
| New | +$1.71M |
|
2087
PUT
Recursion Pharmaceuticals
RXRX
$1.57B
| $2.04M | ﹤0.01% |
403,600
+8,800
| +2% | +$43.2K |
|
2088
CALL
W.P. Carey
WPC
$17.1B
| $2.04M | ﹤0.01% |
33,000
-8,800
| -21% | -$542K |
|
|
PPLT
2089
PUT
abrdn Physical Platinum Shares ETF
PPLT
$1.81B
| $2.04M | ﹤0.01% |
166,000
+158,000
| +1,975% | +$1.55M |
|
2090
PUT
Rapid7
RPD
$634M
| $2.04M | ﹤0.01% |
88,000
+18,800
| +27% | +$446K |
|
|
CMA
2091
CALL
DELISTED
Comerica
CMA
| $2.03M | ﹤0.01% |
34,100
-19,600
| -36% | -$1.09M |
|
2092
CALL
Bitwise Bitcoin ETF
BITB
$2.46B
| $2.03M | ﹤0.01% |
34,700
+5,400
| +18% | +$290K |
|
2093
Entegris
ENTG
$19.7B
| $2.03M | ﹤0.01% |
25,190
+20,131
| +398% | +$1.53M |
|
2094
CALL
Leonardo DRS
DRS
$12.8B
| $2.03M | ﹤0.01% |
43,600
+30,700
| +238% | +$1.23M |
|
2095
PUT
Vail Resorts
MTN
$5.19B
| $2.03M | ﹤0.01% |
12,900
-5,200
| -29% | -$773K |
|
2096
CALL
Mirion Technologies
MIR
$4.05B
| $2.02M | ﹤0.01% |
94,100
+12,200
| +15% | +$210K |
|
2097
PUT
Texas Roadhouse
TXRH
$12.7B
| $2.02M | ﹤0.01% |
10,800
-15,400
| -59% | -$2.76M |
|
|
GOGL
2098
CALL
DELISTED
Golden Ocean Group
GOGL
| $2.02M | ﹤0.01% |
276,500
+9,200
| +3% | +$69.8K |
|
2099
iShares Russell 1000 Growth ETF
IWF
$122B
| $2.02M | ﹤0.01% |
+19,036
| New | +$1.82M |
|
2100
Dynatrace
DT
$12.1B
| $2.02M | ﹤0.01% |
36,511
+11,253
| +45% | +$564K |
|
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.