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 | |
|---|---|---|---|---|---|---|
6201
CALL
Alto Ingredients
ALTO
$338M
| $37K | ﹤0.01% |
32,300
+600
| +2% | +$575 |
|
6202
Atlanta Braves Holdings Series B
BATRK
$3.28B
| $37K | ﹤0.01% |
+800
| New | +$32.7K |
|
6203
PUT
United States Brent Oil Fund
BNO
$782M
| $37K | ﹤0.01% |
1,300
+100
| +8% | +$2.82K |
|
6204
CALL
Cabot Corp
CBT
$4.72B
| $37K | ﹤0.01% |
500
-400
| -44% | -$30.6K |
|
6205
CALL
Cimpress
CMPR
$2.37B
| $37K | ﹤0.01% |
800
-100
| -11% | -$4.37K |
|
6206
Equinix
EQIX
$99.4B
| $37K | ﹤0.01% |
+47
| New | +$39.9K |
|
6207
Fidelity MSCI Industrials Index ETF
FIDU
$2.26B
| $37K | ﹤0.01% |
484
+188
| +64% | +$13.5K |
|
6208
CALL
inTEST
INTT
$143M
| $37K | ﹤0.01% |
5,100
+4,000
| +364% | +$25.4K |
|
6209
iShares US Basic Materials ETF
IYM
$1.13B
| $37K | ﹤0.01% |
271
+221
| +442% | +$29.3K |
|
6210
Jazz Pharmaceuticals
JAZZ
$16.1B
| $37K | ﹤0.01% |
354
-3,417
| -91% | -$371K |
|
6211
Lantronix
LTRX
$223M
| $37K | ﹤0.01% |
13,118
-10,709
| -45% | -$24.3K |
|
6212
CALL
Monro
MNRO
$414M
| $37K | ﹤0.01% |
2,500
+900
| +56% | +$13K |
|
6213
PUT
Pembina Pipeline
PBA
$29.3B
| $37K | ﹤0.01% |
1,000
+300
| +43% | +$11.3K |
|
6214
PUT
SIGA Technologies
SIGA
$240M
| $37K | ﹤0.01% |
5,700
-6,300
| -53% | -$37.8K |
|
6215
PUT
Sportsman's Warehouse
SPWH
$44.9M
| $37K | ﹤0.01% |
+10,800
| New | +$24.2K |
|
6216
Stewart Information Services
STC
$2.14B
| $37K | ﹤0.01% |
570
+403
| +241% | +$25.9K |
|
6217
PUT
Tompkins Financial
TMP
$1.42B
| $37K | ﹤0.01% |
600
+300
| +100% | +$18.3K |
|
6218
PUT
Veracyte
VCYT
$4.45B
| $37K | ﹤0.01% |
1,400
-700
| -33% | -$20.3K |
|
6219
PUT
Viavi Solutions
VIAV
$7.95B
| $37K | ﹤0.01% |
3,700
+1,800
| +95% | +$17.4K |
|
6220
PUT
Verastem
VSTM
$528M
| $37K | ﹤0.01% |
+9,000
| New | +$56.4K |
|
6221
PUT
Westrock Coffee
WEST
$798M
| $37K | ﹤0.01% |
6,500
+200
| +3% | +$1.29K |
|
6222
CALL
Wintrust Financial
WTFC
$10.7B
| $37K | ﹤0.01% |
+300
| New | +$34.4K |
|
|
XOMA
6223
CALL
DELISTED
Xoma
XOMA
| $37K | ﹤0.01% |
+1,500
| New | +$35.9K |
|
6224
YieldMax AMD Option Income Strategy ETF
AMDY
$351M
| $36K | ﹤0.01% |
+898
| New | +$33.1K |
|
6225
PUT
AerSale
ASLE
$291M
| $36K | ﹤0.01% |
6,000
-5,800
| -49% | -$37.1K |
|
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.