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 | |
|---|---|---|---|---|---|---|
1976
CALL
Roivant Sciences
ROIV
$25.2B
| $2.3M | ﹤0.01% |
204,000
+92,100
| +82% | +$998K |
|
1977
CALL
Carter's
CRI
$1.43B
| $2.3M | ﹤0.01% |
76,300
+70,000
| +1,111% | +$2.37M |
|
1978
PUT
Domino's
DPZ
$11B
| $2.3M | ﹤0.01% |
5,100
-26,700
| -84% | -$12.5M |
|
1979
CALL
Procore
PCOR
$6.46B
| $2.3M | ﹤0.01% |
33,600
-29,700
| -47% | -$1.94M |
|
|
BBBY
1980
CALL
Bed Bath & Beyond
BBBY
$473M
| $2.3M | ﹤0.01% |
367,180
+247,280
| +206% | +$1.2M |
|
1981
CALL
Omnicom Group
OMC
$22.7B
| $2.29M | ﹤0.01% |
31,900
+5,600
| +21% | +$414K |
|
1982
PUT
Lemonade
LMND
$4.62B
| $2.29M | ﹤0.01% |
52,200
-33,400
| -39% | -$1.11M |
|
|
AEVA
1983
CALL
Aeva Technologies
AEVA
$1.02B
| $2.28M | ﹤0.01% |
60,400
+45,500
| +305% | +$692K |
|
1984
PUT
SSR Mining
SSRM
$5.57B
| $2.27M | ﹤0.01% |
178,500
+146,700
| +461% | +$1.65M |
|
1985
PUT
Dave & Buster's
PLAY
$343M
| $2.27M | ﹤0.01% |
75,500
-2,200
| -3% | -$49.7K |
|
1986
United Rentals
URI
$71.1B
| $2.27M | ﹤0.01% |
+3,010
| New | +$2.01M |
|
1987
PUT
Entegris
ENTG
$19.7B
| $2.27M | ﹤0.01% |
28,100
-4,600
| -14% | -$350K |
|
1988
PUT
Targa Resources
TRGP
$60.4B
| $2.26M | ﹤0.01% |
13,000
+5,300
| +69% | +$890K |
|
1989
PUT
Emcor
EME
$33.1B
| $2.25M | ﹤0.01% |
4,200
-6,600
| -61% | -$2.91M |
|
|
SMLR
1990
DELISTED
Semler Scientific
SMLR
| $2.25M | ﹤0.01% |
57,994
+46,337
| +398% | +$1.65M |
|
1991
CALL
Sharplink Inc
SBET
$1.22B
| $2.24M | ﹤0.01% |
+225,800
| New | +$3.06M |
|
1992
CALL
Genius Sports
GENI
$1.73B
| $2.24M | ﹤0.01% |
215,000
-10,200
| -5% | -$102K |
|
|
SLNO
1993
PUT
DELISTED
Soleno Therapeutics
SLNO
| $2.24M | ﹤0.01% |
26,700
-33,500
| -56% | -$2.51M |
|
1994
CALL
Stride
LRN
$3.69B
| $2.23M | ﹤0.01% |
15,400
-3,200
| -17% | -$463K |
|
|
PPLC
1995
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $2.23M | ﹤0.01% |
120,200
-833,200
| -87% | -$15.5M |
|
|
SHNY
1996
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $2.23M | ﹤0.01% |
367,500
-171,900
| -32% | -$1.04M |
|
1997
CALL
Expedia Group
EXPE
$31.2B
| $2.23M | ﹤0.01% |
13,200
-51,400
| -80% | -$8.34M |
|
1998
CALL
Global Net Lease
GNL
$1.87B
| $2.23M | ﹤0.01% |
294,900
+263,900
| +851% | +$2M |
|
1999
PUT
Commercial Metals
CMC
$7.63B
| $2.23M | ﹤0.01% |
45,500
+32,800
| +258% | +$1.52M |
|
|
EXK
2000
Endeavour Silver
EXK
$2.32B
| $2.22M | ﹤0.01% |
+451,500
| New | +$1.78M |
|
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.