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 | |
|---|---|---|---|---|---|---|
7701
CALL
Apyx Medical
APYX
$165M
| $5K | ﹤0.01% |
+2,400
| New | +$3.38K |
|
7702
CALL
Accuray
ARAY
$28.4M
| $5K | ﹤0.01% |
4,100
-9,700
| -70% | -$14.4K |
|
7703
CALL
Amtech Systems
ASYS
$278M
| $5K | ﹤0.01% |
+1,200
| New | +$4.69K |
|
7704
CALL
Autohome
ATHM
$2.43B
| $5K | ﹤0.01% |
200
-4,500
| -96% | -$117K |
|
|
AUTL
7705
Autolus Therapeutics
AUTL
$386M
| $5K | ﹤0.01% |
+2,512
| New | +$4.15K |
|
7706
PUT
Aveanna Healthcare
AVAH
$2.06B
| $5K | ﹤0.01% |
1,000
+700
| +233% | +$3.56K |
|
7707
PUT
Axalta
AXTA
$7.01B
| $5K | ﹤0.01% |
200
-6,500
| -97% | -$202K |
|
7708
BioAtla
BCAB
$5.59M
| $5K | ﹤0.01% |
266
+77
| +41% | +$1.56K |
|
7709
Black Diamond Therapeutics
BDTX
$101M
| $5K | ﹤0.01% |
+2,186
| New | +$4.21K |
|
7710
PUT
Biomea Fusion
BMEA
$90.4M
| $5K | ﹤0.01% |
3,300
-2,200
| -40% | -$4.24K |
|
7711
PUT
Brixmor Property Group
BRX
$9.95B
| $5K | ﹤0.01% |
200
| – | – |
|
7712
CALL
Betterware México
BWMX
$623M
| $5K | ﹤0.01% |
600
+400
| +200% | +$3.73K |
|
7713
CALL
Community Bank
CBU
$3.53B
| $5K | ﹤0.01% |
100
| – | – |
|
7714
PUT
Celcuity
CELC
$4.03B
| $5K | ﹤0.01% |
+400
| New | +$4.36K |
|
7715
PUT
Coherus Oncology
CHRS
$217M
| $5K | ﹤0.01% |
7,300
-500
| -6% | -$432 |
|
|
CIO
7716
PUT
DELISTED
City Office REIT
CIO
| $5K | ﹤0.01% |
1,100
-2,200
| -67% | -$11K |
|
7717
PUT
Crinetics Pharmaceuticals
CRNX
$8.86B
| $5K | ﹤0.01% |
200
-200
| -50% | -$6.18K |
|
7718
CALL
Champions Oncology
CSBR
$85.1M
| $5K | ﹤0.01% |
800
-100
| -11% | -$706 |
|
7719
CALL
CXApp
CXAI
$11.9M
| $5K | ﹤0.01% |
5,000
-9,800
| -66% | -$10.4K |
|
|
DCBO
7720
CALL
Docebo
DCBO
$492M
| $5K | ﹤0.01% |
200
-100
| -33% | -$2.84K |
|
7721
CALL
Diodes
DIOD
$4B
| $5K | ﹤0.01% |
100
-1,200
| -92% | -$52.8K |
|
7722
Dynagas LNG Partners
DLNG
$131M
| $5K | ﹤0.01% |
+1,492
| New | +$5.36K |
|
7723
Duluth Holdings
DLTH
$160M
| $5K | ﹤0.01% |
+2,450
| New | +$4.6K |
|
7724
PUT
GrafTech
EAF
$194M
| $5K | ﹤0.01% |
530
+20
| +4% | +$177 |
|
7725
First Trust Dow 30 Equal Weight ETF
EDOW
$308M
| $5K | ﹤0.01% |
+150
| New | +$5.4K |
|
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.