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 | |
|---|---|---|---|---|---|---|
2026
PUT
State Street
STT
$50.9B
| $2.17M | ﹤0.01% |
20,400
-23,800
| -54% | -$2.2M |
|
2027
CALL
Bit Digital
BTBT
$484M
| $2.17M | ﹤0.01% |
990,000
-195,200
| -16% | -$431K |
|
2028
PUT
B2Gold
BTG
$5.16B
| $2.17M | ﹤0.01% |
600,100
+14,300
| +2% | +$46.9K |
|
2029
PUT
FS KKR Capital
FSK
$2.98B
| $2.17M | ﹤0.01% |
104,400
-7,900
| -7% | -$161K |
|
2030
PUT
Kimberly-Clark
KMB
$36.4B
| $2.17M | ﹤0.01% |
16,800
-16,900
| -50% | -$2.29M |
|
2031
CALL
Weibo
WB
$1.9B
| $2.17M | ﹤0.01% |
227,200
-74,400
| -25% | -$654K |
|
2032
Transmedics
TMDX
$2.5B
| $2.16M | ﹤0.01% |
16,149
-492
| -3% | -$54K |
|
|
K
2033
CALL
DELISTED
Kellanova
K
| $2.16M | ﹤0.01% |
27,200
+9,100
| +50% | +$744K |
|
|
CTRA
2034
PUT
DELISTED
Coterra Energy
CTRA
| $2.16M | ﹤0.01% |
85,100
-22,300
| -21% | -$565K |
|
2035
PUT
Hormel Foods
HRL
$13.9B
| $2.16M | ﹤0.01% |
71,400
+22,600
| +46% | +$682K |
|
2036
PUT
Xcel Energy
XEL
$51B
| $2.16M | ﹤0.01% |
31,700
-6,400
| -17% | -$444K |
|
2037
PUT
StoneCo
STNE
$2.62B
| $2.15M | ﹤0.01% |
134,300
-165,500
| -55% | -$2.21M |
|
2038
Stanley Black & Decker
SWK
$14.2B
| $2.15M | ﹤0.01% |
31,770
+5,020
| +19% | +$324K |
|
2039
PUT
Weyerhaeuser
WY
$17.3B
| $2.15M | ﹤0.01% |
83,800
+68,500
| +448% | +$1.79M |
|
2040
PUT
Nice
NICE
$5.29B
| $2.15M | ﹤0.01% |
12,700
-62,800
| -83% | -$10.1M |
|
2041
CALL
Comfort Systems
FIX
$61B
| $2.14M | ﹤0.01% |
4,000
-5,100
| -56% | -$2.22M |
|
2042
Eldorado Gold
EGO
$8.31B
| $2.14M | ﹤0.01% |
105,375
+49,512
| +89% | +$964K |
|
2043
Harley-Davidson
HOG
$2.68B
| $2.14M | ﹤0.01% |
90,680
-10,471
| -10% | -$249K |
|
2044
PUT
Viatris
VTRS
$20.1B
| $2.14M | ﹤0.01% |
239,400
+137,400
| +135% | +$1.16M |
|
2045
PUT
Perion Network
PERI
$367M
| $2.13M | ﹤0.01% |
209,700
-29,000
| -12% | -$277K |
|
2046
CALL
LCI Industries
LCII
$2.51B
| $2.12M | ﹤0.01% |
23,300
+5,500
| +31% | +$469K |
|
2047
Intuitive Machines
LUNR
$2.07B
| $2.12M | ﹤0.01% |
195,433
-64,921
| -25% | -$635K |
|
2048
Vanguard Long-Term Treasury ETF
VGLT
$10.1B
| $2.12M | ﹤0.01% |
37,837
+13,791
| +57% | +$765K |
|
2049
PUT
Papa John's
PZZA
$999M
| $2.12M | ﹤0.01% |
43,300
-2,300
| -5% | -$93.8K |
|
|
FL
2050
DELISTED
Foot Locker
FL
| $2.12M | ﹤0.01% |
86,486
+38,129
| +79% | +$693K |
|
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.