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 | |
|---|---|---|---|---|---|---|
3051
CALL
Algoma Steel
ASTL
$448M
| $773K | ﹤0.01% |
112,200
+16,300
| +17% | +$91K |
|
3052
B2Gold
BTG
$5.13B
| $773K | ﹤0.01% |
214,242
-341,429
| -61% | -$1.12M |
|
|
HBI
3053
PUT
DELISTED
Hanesbrands
HBI
| $773K | ﹤0.01% |
168,800
-19,800
| -10% | -$95.5K |
|
|
NSLR
3054
CALL
Neostellar Capital Corp
NSLR
$264M
| $773K | ﹤0.01% |
+94,200
| New | +$561K |
|
3055
CALL
Green Plains
GPRE
$1.16B
| $771K | ﹤0.01% |
128,000
+18,400
| +17% | +$81.1K |
|
3056
CALL
Rogers Communications
RCI
$17.8B
| $771K | ﹤0.01% |
26,000
-33,800
| -57% | -$886K |
|
3057
CALL
Allison Transmission
ALSN
$9.96B
| $769K | ﹤0.01% |
8,100
+7,500
| +1,250% | +$725K |
|
3058
CALL
Howard Hughes
HHH
$3.97B
| $769K | ﹤0.01% |
11,400
+6,200
| +119% | +$424K |
|
3059
CALL
Trevi Therapeutics
TRVI
$2.54B
| $769K | ﹤0.01% |
140,600
-4,000
| -3% | -$24.9K |
|
3060
PUT
Bit Digital
BTBT
$463M
| $768K | ﹤0.01% |
351,000
+270,300
| +335% | +$597K |
|
3061
CALL
Martin Marietta Materials
MLM
$34.3B
| $768K | ﹤0.01% |
1,400
-500
| -26% | -$264K |
|
|
DFTX
3062
CALL
Definium Therapeutics
DFTX
$5.67B
| $768K | ﹤0.01% |
118,400
-9,600
| -8% | -$63.1K |
|
3063
PUT
10x Genomics
TXG
$5.82B
| $768K | ﹤0.01% |
66,400
+62,600
| +1,647% | +$571K |
|
3064
CALL
ACM Research
ACMR
$5.34B
| $766K | ﹤0.01% |
29,600
-27,000
| -48% | -$607K |
|
3065
PUT
Coursera
COUR
$1.62B
| $766K | ﹤0.01% |
87,500
+49,400
| +130% | +$405K |
|
3066
PUT
LifeMD
LFMD
$180M
| $766K | ﹤0.01% |
56,300
-57,800
| -51% | -$546K |
|
3067
Cipher Digital
CIFR
$8.68B
| $765K | ﹤0.01% |
160,178
-24,837
| -13% | -$80.3K |
|
3068
CALL
Asbury Automotive
ABG
$4.23B
| $763K | ﹤0.01% |
3,200
+100
| +3% | +$22.9K |
|
3069
PUT
Scotiabank
BNS
$106B
| $762K | ﹤0.01% |
13,800
-13,200
| -49% | -$672K |
|
3070
PUT
SEALSQ Corp
LAES
$537M
| $762K | ﹤0.01% |
189,300
+174,900
| +1,215% | +$537K |
|
3071
CALL
Invesco CurrencyShares Swiss Franc Trust
FXF
$409M
| $760K | ﹤0.01% |
6,800
+3,900
| +134% | +$419K |
|
3072
PUT
Structure Therapeutics
GPCR
$3.49B
| $759K | ﹤0.01% |
36,600
-3,700
| -9% | -$81.4K |
|
|
NAK
3073
CALL
Northern Dynasty Minerals
NAK
$846M
| $759K | ﹤0.01% |
566,900
+349,200
| +160% | +$390K |
|
3074
Turning Point Brands
TPB
$1.52B
| $759K | ﹤0.01% |
10,028
+2,911
| +41% | +$198K |
|
3075
CALL
Trimble
TRMB
$13B
| $759K | ﹤0.01% |
10,000
-35,300
| -78% | -$2.37M |
|
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.