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 | |
|---|---|---|---|---|---|---|
1926
CALL
Nasdaq
NDAQ
$51.5B
| $2.45M | ﹤0.01% |
27,400
-71,200
| -72% | -$5.68M |
|
1927
PUT
Interparfums
IPAR
$3.92B
| $2.44M | ﹤0.01% |
18,600
+17,700
| +1,967% | +$2.16M |
|
|
BBBY
1928
PUT
Bed Bath & Beyond
BBBY
$473M
| $2.43M | ﹤0.01% |
388,630
+274,670
| +241% | +$1.33M |
|
1929
Blackstone
BX
$104B
| $2.43M | ﹤0.01% |
16,222
-66,115
| -80% | -$9.08M |
|
1930
Cinemark Holdings
CNK
$3.82B
| $2.42M | ﹤0.01% |
+80,181
| New | +$2.42M |
|
1931
CALL
McCormick & Company Non-Voting
MKC
$13.4B
| $2.42M | ﹤0.01% |
31,900
+9,700
| +44% | +$727K |
|
1932
CALL
Celanese
CE
$5.09B
| $2.41M | ﹤0.01% |
43,600
-64,000
| -59% | -$3.19M |
|
1933
QuantumScape Corp
QS
$3B
| $2.41M | ﹤0.01% |
358,479
-268,770
| -43% | -$1.14M |
|
1934
CALL
indie Semiconductor
INDI
$733M
| $2.4M | ﹤0.01% |
675,800
+292,600
| +76% | +$736K |
|
1935
Hasbro
HAS
$12.6B
| $2.4M | ﹤0.01% |
+32,561
| New | +$2.05M |
|
1936
Bitwise Bitcoin ETF
BITB
$2.46B
| $2.4M | ﹤0.01% |
41,000
+32,547
| +385% | +$1.75M |
|
1937
CALL
CNX Resources
CNX
$4.85B
| $2.4M | ﹤0.01% |
71,300
-10,000
| -12% | -$315K |
|
|
SERV
1938
PUT
Serve Robotics
SERV
$409M
| $2.4M | ﹤0.01% |
209,900
+120,600
| +135% | +$1.06M |
|
1939
CALL
Pool Corp
POOL
$6.7B
| $2.39M | ﹤0.01% |
8,200
+800
| +11% | +$242K |
|
1940
CALL
CRH
CRH
$66.7B
| $2.39M | ﹤0.01% |
26,000
-100,800
| -79% | -$9.19M |
|
1941
CALL
Equifax
EFX
$20.3B
| $2.39M | ﹤0.01% |
9,200
+3,400
| +59% | +$865K |
|
1942
CALL
Alight
ALIT
$497M
| $2.38M | ﹤0.01% |
21,070
-40
| -0.2% | -$4.28K |
|
|
ITOS
1943
PUT
DELISTED
iTeos Therapeutics
ITOS
| $2.38M | ﹤0.01% |
239,300
+239,000
| +79,667% | +$1.93M |
|
1944
CALL
TC Energy
TRP
$73.5B
| $2.38M | ﹤0.01% |
48,900
-84,100
| -63% | -$4.13M |
|
1945
Vanguard Real Estate ETF
VNQ
$39.9B
| $2.38M | ﹤0.01% |
+26,777
| New | +$2.36M |
|
1946
Avantor
AVTR
$7.81B
| $2.38M | ﹤0.01% |
+176,909
| New | +$2.42M |
|
1947
CALL
Masco
MAS
$16B
| $2.38M | ﹤0.01% |
37,000
+31,100
| +527% | +$1.96M |
|
1948
PPG Industries
PPG
$25.9B
| $2.38M | ﹤0.01% |
+20,932
| New | +$2.26M |
|
1949
CALL
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$263M
| $2.38M | ﹤0.01% |
20,700
-7,800
| -27% | -$462K |
|
1950
PUT
DaVita
DVA
$15.1B
| $2.38M | ﹤0.01% |
16,700
-48,200
| -74% | -$6.83M |
|
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.