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 | |
|---|---|---|---|---|---|---|
|
VNET
5326
VNET Group
VNET
$2.08B
| $92K | ﹤0.01% |
+13,439
| New | +$80.5K |
|
5327
Yeti Holdings
YETI
$3.76B
| $92K | ﹤0.01% |
+2,941
| New | +$88.3K |
|
5328
CALL
Arq
ARQ
$88.4M
| $92K | ﹤0.01% |
17,300
+10,600
| +158% | +$46.4K |
|
|
TE
5329
CALL
T1 Energy
TE
$1.19B
| $92K | ﹤0.01% |
75,000
+14,600
| +24% | +$17.8K |
|
|
BORR
5330
CALL
Borr Drilling
BORR
$1.23B
| $91K | ﹤0.01% |
50,000
-18,400
| -27% | -$34.8K |
|
|
CGAU
5331
PUT
Centerra Gold
CGAU
$3.58B
| $91K | ﹤0.01% |
12,700
-1,100
| -8% | -$7.52K |
|
5332
CALL
G-III Apparel Group
GIII
$1.55B
| $91K | ﹤0.01% |
4,100
+1,100
| +37% | +$27.7K |
|
5333
Incyte
INCY
$24.9B
| $91K | ﹤0.01% |
+1,342
| New | +$85K |
|
5334
PUT
Medifast
MED
$110M
| $91K | ﹤0.01% |
6,500
-1,700
| -21% | -$22.3K |
|
5335
CALL
ProShares UltraShort Industrials
SIJ
$5.97M
| $91K | ﹤0.01% |
1,350
-175
| -11% | -$5.32K |
|
5336
TaskUs
TASK
$542M
| $91K | ﹤0.01% |
5,489
+4,537
| +477% | +$69.1K |
|
5337
Westrock Coffee
WEST
$797M
| $91K | ﹤0.01% |
15,953
-5,254
| -25% | -$33.9K |
|
5338
CALL
Willis Towers Watson
WTW
$31.7B
| $91K | ﹤0.01% |
300
-49,300
| -99% | -$15.3M |
|
5339
Black Hills Corp
BKH
$5.5B
| $90K | ﹤0.01% |
+1,605
| New | +$94K |
|
5340
CALL
California Water Service
CWT
$3.02B
| $90K | ﹤0.01% |
+2,000
| New | +$95.7K |
|
5341
CALL
Denali Therapeutics
DNLI
$3.86B
| $90K | ﹤0.01% |
6,500
+5,000
| +333% | +$70.4K |
|
|
ETNB
5342
DELISTED
89bio
ETNB
| $90K | ﹤0.01% |
9,193
+5,507
| +149% | +$45.6K |
|
|
GOOD
5343
PUT
Gladstone Commercial Corp
GOOD
$606M
| $90K | ﹤0.01% |
6,300
+5,500
| +688% | +$78.1K |
|
5344
PUT
Graphic Packaging
GPK
$3.24B
| $90K | ﹤0.01% |
4,300
+2,700
| +169% | +$62.4K |
|
|
JFIN
5345
Jiayin Group
JFIN
$116M
| $90K | ﹤0.01% |
5,657
-4,856
| -46% | -$65.9K |
|
5346
Oppenheimer Holdings
OPY
$1.19B
| $90K | ﹤0.01% |
+1,377
| New | +$84K |
|
|
AVGX
5347
Defiance Daily Target 2X Long AVGO ETF
AVGX
$246M
| $90K | ﹤0.01% |
+2,521
| New | +$59K |
|
|
JOYY
5348
JOYY Inc
JOYY
$3.68B
| $90K | ﹤0.01% |
+1,771
| New | +$78.6K |
|
5349
PUT
Autoliv
ALV
$9.09B
| $89K | ﹤0.01% |
800
-1,800
| -69% | -$176K |
|
5350
PUT
Candel Therapeutics
CADL
$723M
| $89K | ﹤0.01% |
17,600
-73,200
| -81% | -$377K |
|
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.