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 | |
|---|---|---|---|---|---|---|
2501
CALL
Kymera Therapeutics
KYMR
$9.1B
| $1.31M | ﹤0.01% |
30,100
+2,400
| +9% | +$82.6K |
|
2502
PUT
VinFast Auto
VFS
$6.67B
| $1.31M | ﹤0.01% |
366,900
+231,300
| +171% | +$784K |
|
2503
PUT
Cimpress
CMPR
$2.37B
| $1.31M | ﹤0.01% |
27,800
+1,400
| +5% | +$61.1K |
|
|
SNDK
2504
PUT
Sandisk
SNDK
$213B
| $1.31M | ﹤0.01% |
28,800
+13,500
| +88% | +$516K |
|
2505
CALL
Jazz Pharmaceuticals
JAZZ
$15.9B
| $1.3M | ﹤0.01% |
12,300
+6,400
| +108% | +$695K |
|
2506
Western Midstream Partners
WES
$19.6B
| $1.3M | ﹤0.01% |
33,680
+9,323
| +38% | +$355K |
|
|
GRNY
2507
FundStrat Granny Shots US Large Cap ETF
GRNY
$4.3B
| $1.3M | ﹤0.01% |
57,285
+38,078
| +198% | +$758K |
|
2508
CALL
Gaming and Leisure Properties
GLPI
$12.8B
| $1.3M | ﹤0.01% |
27,800
-13,800
| -33% | -$652K |
|
2509
PUT
Kanzhun
BZ
$6.89B
| $1.3M | ﹤0.01% |
72,700
-10,400
| -13% | -$175K |
|
|
AMTM
2510
PUT
Amentum Holdings
AMTM
$5.51B
| $1.3M | ﹤0.01% |
54,900
-93,100
| -63% | -$1.95M |
|
2511
PUT
Equity Residential
EQR
$25.4B
| $1.29M | ﹤0.01% |
19,200
-58,500
| -75% | -$4.02M |
|
|
NNDM
2512
PUT
Nano Dimension
NNDM
$309M
| $1.29M | ﹤0.01% |
799,600
-486,700
| -38% | -$745K |
|
2513
PUT
Gartner
IT
$9.41B
| $1.29M | ﹤0.01% |
3,200
-12,400
| -79% | -$5.19M |
|
2514
RUM Group Inc
RUM
$1.57B
| $1.29M | ﹤0.01% |
143,531
+44,607
| +45% | +$381K |
|
|
JOYY
2515
CALL
JOYY Inc
JOYY
$3.73B
| $1.29M | ﹤0.01% |
25,300
-70,400
| -74% | -$3.12M |
|
2516
CALL
New York Times
NYT
$11.6B
| $1.29M | ﹤0.01% |
23,000
-32,500
| -59% | -$1.72M |
|
2517
PUT
Enterprise Products Partners
EPD
$83.8B
| $1.29M | ﹤0.01% |
41,500
-208,600
| -83% | -$6.5M |
|
2518
Becton Dickinson
BDX
$43.1B
| $1.28M | ﹤0.01% |
7,456
-2,638
| -26% | -$484K |
|
2519
CALL
Manulife Financial
MFC
$72.6B
| $1.28M | ﹤0.01% |
40,200
-7,800
| -16% | -$240K |
|
2520
CALL
Natera
NTRA
$37.5B
| $1.28M | ﹤0.01% |
7,600
-16,800
| -69% | -$2.62M |
|
2521
PUT
Dover
DOV
$27.2B
| $1.28M | ﹤0.01% |
7,000
+4,600
| +192% | +$800K |
|
2522
PUT
G-III Apparel Group
GIII
$1.47B
| $1.28M | ﹤0.01% |
57,200
+52,400
| +1,092% | +$1.32M |
|
2523
Roku
ROKU
$21.1B
| $1.28M | ﹤0.01% |
14,569
-28,284
| -66% | -$1.98M |
|
2524
PUT
Huntington Bancshares
HBAN
$35.1B
| $1.28M | ﹤0.01% |
76,300
+19,700
| +35% | +$297K |
|
2525
CALL
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $1.28M | ﹤0.01% |
21,200
-6,700
| -24% | -$182K |
|
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.