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 | |
|---|---|---|---|---|---|---|
3701
PUT
CNX Resources
CNX
$4.84B
| $417K | ﹤0.01% |
12,400
-39,400
| -76% | -$1.24M |
|
3702
CALL
Vulcan Materials
VMC
$37.4B
| $417K | ﹤0.01% |
1,600
+400
| +33% | +$103K |
|
3703
CALL
Ametek
AME
$55.3B
| $416K | ﹤0.01% |
2,300
-28,100
| -92% | -$4.83M |
|
3704
CALL
Artisan Partners
APAM
$2.9B
| $416K | ﹤0.01% |
9,400
+6,800
| +262% | +$272K |
|
3705
Pathward Financial
CASH
$1.87B
| $416K | ﹤0.01% |
+5,270
| New | +$403K |
|
3706
CALL
Helmerich & Payne
HP
$3.31B
| $416K | ﹤0.01% |
27,500
+14,900
| +118% | +$273K |
|
3707
Sabesp
SBS
$19.3B
| $416K | ﹤0.01% |
97,855
+97,082
| +12,559% | +$376K |
|
3708
PUT
BlackSky Technology
BKSY
$898M
| $415K | ﹤0.01% |
20,200
+5,700
| +39% | +$61.4K |
|
|
CMPS
3709
PUT
Compass Pathways
CMPS
$1.46B
| $415K | ﹤0.01% |
148,500
+128,400
| +639% | +$483K |
|
3710
PUT
Denali Therapeutics
DNLI
$3.82B
| $415K | ﹤0.01% |
+29,700
| New | +$418K |
|
3711
PUT
Iovance Biotherapeutics
IOVA
$2.1B
| $415K | ﹤0.01% |
241,800
+82,300
| +52% | +$205K |
|
3712
CALL
Cardiff Oncology
CRDF
$63.4M
| $414K | ﹤0.01% |
131,700
+115,600
| +718% | +$353K |
|
3713
CALL
Indivior Pharmaceuticals
INDV
$4.84B
| $414K | ﹤0.01% |
28,100
+21,700
| +339% | +$253K |
|
|
PMT
3714
CALL
PennyMac Mortgage Investment
PMT
$854M
| $414K | ﹤0.01% |
32,200
+1,600
| +5% | +$20.4K |
|
3715
CALL
Polestar Automotive Holding UK
PSNY
$2.03B
| $414K | ﹤0.01% |
12,903
-4,754
| -27% | -$151K |
|
3716
CALL
Tyler Technologies
TYL
$13.7B
| $414K | ﹤0.01% |
700
-400
| -36% | -$227K |
|
3717
PUT
Invesco Mortgage Capital
IVR
$769M
| $413K | ﹤0.01% |
52,800
-102,700
| -66% | -$757K |
|
|
NGD
3718
PUT
DELISTED
New Gold Inc
NGD
| $413K | ﹤0.01% |
83,600
+9,300
| +13% | +$38.2K |
|
3719
VanEck Uranium + Nuclear Energy ETF
NLR
$3.8B
| $413K | ﹤0.01% |
3,716
+669
| +22% | +$59.5K |
|
3720
PUT
Varex Imaging
VREX
$470M
| $412K | ﹤0.01% |
47,600
+46,100
| +3,073% | +$376K |
|
3721
PUT
FuelCell Energy
FCEL
$1.57B
| $411K | ﹤0.01% |
73,400
-20,200
| -22% | -$98K |
|
3722
PUT
Portland General Electric
POR
$5.92B
| $410K | ﹤0.01% |
+10,100
| New | +$424K |
|
3723
iShares Semiconductor ETF
SOXX
$40.6B
| $410K | ﹤0.01% |
+1,718
| New | +$344K |
|
3724
PUT
Zimmer Biomet
ZBH
$18.5B
| $410K | ﹤0.01% |
4,500
+1,700
| +61% | +$164K |
|
3725
PUT
Dana Inc
DAN
$2.95B
| $409K | ﹤0.01% |
23,900
+16,300
| +214% | +$243K |
|
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.