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 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.62% |
| 2 | Communication Services | 0.22% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1976
PUT
Fidelity Wise Origin Bitcoin Fund
FBTC
$12B
| $1.69M | ﹤0.01% |
+28,700
| New | +$1.91M |
|
1977
CALL
Sensata Technologies
ST
$6.62B
| $1.69M | ﹤0.01% |
+48,100
| New | +$1.7M |
|
1978
CALL
BJs Wholesale Club
BJ
$12.1B
| $1.69M | ﹤0.01% |
17,200
-23,800
| -58% | -$2.3M |
|
1979
Ondas Inc
ONDS
$4.47B
| $1.69M | ﹤0.01% |
186,978
-280,633
| -60% | -$3.05M |
|
1980
Hawaiian Electric Industries
HE
$2.3B
| $1.69M | ﹤0.01% |
113,865
-90,805
| -44% | -$1.37M |
|
1981
CALL
Builders FirstSource
BLDR
$7.85B
| $1.69M | ﹤0.01% |
20,500
-11,700
| -36% | -$1.25M |
|
|
FPS
1982
CALL
Forgent Power Solutions
FPS
$9.17B
| $1.69M | ﹤0.01% |
+57,600
| New | +$1.92M |
|
1983
CALL
Zillow
Z
$7.42B
| $1.68M | ﹤0.01% |
40,700
-70,900
| -64% | -$3.77M |
|
1984
PUT
Vornado Realty Trust
VNO
$7.53B
| $1.68M | ﹤0.01% |
64,800
+50,000
| +338% | +$1.48M |
|
1985
CALL
MarketAxess Holdings
MKTX
$4.19B
| $1.68M | ﹤0.01% |
10,200
+8,600
| +538% | +$1.51M |
|
|
CMBT
1986
PUT
CMB.TECH NV
CMBT
$4.43B
| $1.68M | ﹤0.01% |
133,000
-190,300
| -59% | -$2.39M |
|
|
EXE
1987
PUT
Expand Energy Corp
EXE
$21.7B
| $1.68M | ﹤0.01% |
15,300
-29,400
| -66% | -$3.14M |
|
1988
PUT
B2Gold
BTG
$5.17B
| $1.68M | ﹤0.01% |
369,800
-666,100
| -64% | -$3.34M |
|
1989
CALL
Ionis Pharmaceuticals
IONS
$9.36B
| $1.67M | ﹤0.01% |
22,300
-34,300
| -61% | -$2.71M |
|
1990
CALL
Eastman Chemical
EMN
$7.79B
| $1.67M | ﹤0.01% |
21,900
-101,500
| -82% | -$7.32M |
|
1991
Anterix
ATEX
$1.81B
| $1.67M | ﹤0.01% |
43,750
+21,200
| +94% | +$671K |
|
1992
Sea Limited
SE
$64.3B
| $1.67M | ﹤0.01% |
20,163
-8,717
| -30% | -$934K |
|
|
CTRA
1993
PUT
DELISTED
Coterra Energy
CTRA
| $1.67M | ﹤0.01% |
47,500
-46,600
| -50% | -$1.4M |
|
1994
PUT
Velocity Financial
VEL
$696M
| $1.67M | ﹤0.01% |
+92,200
| New | +$1.74M |
|
1995
PUT
Cytokinetics
CYTK
$11B
| $1.67M | ﹤0.01% |
25,300
-18,400
| -42% | -$1.17M |
|
1996
PUT
Calumet Specialty Products
CLMT
$3.52B
| $1.67M | ﹤0.01% |
46,400
-44,600
| -49% | -$1.15M |
|
1997
Boyd Gaming
BYD
$6.58B
| $1.67M | ﹤0.01% |
+20,266
| New | +$1.7M |
|
1998
PUT
Thomson Reuters
TRI
$42.2B
| $1.66M | ﹤0.01% |
18,214
+15,556
| +585% | +$1.64M |
|
1999
CALL
Lincoln National
LNC
$7.93B
| $1.66M | ﹤0.01% |
46,800
-7,400
| -14% | -$284K |
|
2000
CALL
Aurora
AUR
$11.9B
| $1.66M | ﹤0.01% |
402,700
-334,100
| -45% | -$1.48M |
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amazon worth $159M.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,156 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.