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 | |
|---|---|---|---|---|---|---|
1726
State Street SPDR Portfolio S&P 500 Growth ETF
SPYG
$50.7B
| $3.12M | ﹤0.01% |
+32,778
| New | +$2.81M |
|
1727
PUT
Otis Worldwide
OTIS
$27.4B
| $3.11M | ﹤0.01% |
31,400
+27,300
| +666% | +$2.64M |
|
1728
PUT
Cracker Barrel
CBRL
$1.2B
| $3.11M | ﹤0.01% |
50,900
-32,700
| -39% | -$1.65M |
|
1729
CALL
Fluence Energy
FLNC
$1.78B
| $3.1M | ﹤0.01% |
462,800
+353,000
| +321% | +$1.68M |
|
1730
NewMarket
NEU
$7.17B
| $3.1M | ﹤0.01% |
4,492
+4,480
| +37,333% | +$2.78M |
|
1731
CALL
Sprouts Farmers Market
SFM
$7.04B
| $3.1M | ﹤0.01% |
18,800
-9,900
| -34% | -$1.62M |
|
1732
CALL
BJs Wholesale Club
BJ
$11.9B
| $3.09M | ﹤0.01% |
28,700
-24,500
| -46% | -$2.79M |
|
1733
CALL
Murphy USA
MUSA
$11.3B
| $3.09M | ﹤0.01% |
7,600
+6,900
| +986% | +$3.14M |
|
|
WAY
1734
PUT
Waystar Holding Corp
WAY
$4.32B
| $3.08M | ﹤0.01% |
75,500
+63,500
| +529% | +$2.45M |
|
1735
Pinterest
PINS
$12.4B
| $3.08M | ﹤0.01% |
+86,024
| New | +$2.61M |
|
|
PPLT
1736
abrdn Physical Platinum Shares ETF
PPLT
$1.81B
| $3.08M | ﹤0.01% |
+250,740
| New | +$2.45M |
|
1737
CALL
WIX.com
WIX
$2.15B
| $3.07M | ﹤0.01% |
19,400
+12,800
| +194% | +$2.06M |
|
1738
CALL
Jefferies Financial Group
JEF
$12.9B
| $3.07M | ﹤0.01% |
56,200
+32,500
| +137% | +$1.61M |
|
1739
PUT
Yum! Brands
YUM
$41B
| $3.07M | ﹤0.01% |
20,700
-118,400
| -85% | -$17.3M |
|
1740
PUT
Semtech
SMTC
$11.7B
| $3.06M | ﹤0.01% |
67,900
+10,800
| +19% | +$384K |
|
1741
CALL
Freshpet
FRPT
$2.83B
| $3.06M | ﹤0.01% |
45,100
+1,000
| +2% | +$78.1K |
|
1742
PUT
Stride
LRN
$3.69B
| $3.06M | ﹤0.01% |
21,100
-7,800
| -27% | -$1.13M |
|
1743
CALL
Vera Therapeutics
VERA
$2.54B
| $3.06M | ﹤0.01% |
130,000
+112,600
| +647% | +$2.53M |
|
1744
PUT
Enovix
ENVX
$862M
| $3.05M | ﹤0.01% |
337,600
-272,457
| -45% | -$1.78M |
|
1745
Under Armour
UAA
$3B
| $3.05M | ﹤0.01% |
447,074
+3,427
| +0.8% | +$21.3K |
|
1746
CALL
Star Bulk Carriers
SBLK
$3.14B
| $3.05M | ﹤0.01% |
176,900
-9,000
| -5% | -$140K |
|
1747
PUT
Academy Sports + Outdoors
ASO
$2.89B
| $3.05M | ﹤0.01% |
68,000
+19,600
| +40% | +$812K |
|
1748
CALL
NetEase
NTES
$76.5B
| $3.04M | ﹤0.01% |
22,600
-41,300
| -65% | -$4.75M |
|
1749
CALL
TransDigm Group
TDG
$69.2B
| $3.04M | ﹤0.01% |
2,000
+600
| +43% | +$843K |
|
1750
PUT
Sony
SONY
$123B
| $3.04M | ﹤0.01% |
116,700
-30,300
| -21% | -$758K |
|
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.