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
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1976
CALL
Autoliv
ALV
$8.6B
| $2.24M | ﹤0.01% |
23,200
+12,600
| +119% | +$1.21M |
|
1977
Baidu
BIDU
$35.8B
| $2.23M | ﹤0.01% |
16,615
-52,951
| -76% | -$7.42M |
|
1978
PUT
Weibo
WB
$1.9B
| $2.23M | ﹤0.01% |
178,000
-34,300
| -16% | -$456K |
|
|
FTCH
1979
CALL
DELISTED
Farfetch Limited Class A Ordinary Shares
FTCH
| $2.23M | ﹤0.01% |
1,068,400
+294,500
| +38% | +$1.2M |
|
1980
PUT
Leggett & Platt
LEG
$1.52B
| $2.23M | ﹤0.01% |
87,800
+70,300
| +402% | +$1.98M |
|
1981
PUT
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.15B
| $2.23M | ﹤0.01% |
23,800
+9,000
| +61% | +$551K |
|
1982
US Bancorp
USB
$99.6B
| $2.23M | ﹤0.01% |
67,332
+21,593
| +47% | +$787K |
|
1983
CALL
Leonardo DRS
DRS
$12.8B
| $2.22M | ﹤0.01% |
133,100
-122,600
| -48% | -$2.07M |
|
1984
Logitech
LOGI
$15.2B
| $2.22M | ﹤0.01% |
32,233
-14,803
| -31% | -$997K |
|
1985
PUT
Madrigal Pharmaceuticals
MDGL
$12.6B
| $2.22M | ﹤0.01% |
15,200
-10,700
| -41% | -$2.01M |
|
1986
PUT
Sprout Social
SPT
$455M
| $2.21M | ﹤0.01% |
44,400
+22,100
| +99% | +$1.11M |
|
1987
Vanguard Information Technology ETF
VGT
$139B
| $2.21M | ﹤0.01% |
+42,688
| New | +$2.32M |
|
1988
CALL
Zimmer Biomet
ZBH
$17.7B
| $2.21M | ﹤0.01% |
19,700
+6,400
| +48% | +$813K |
|
1989
Allstate
ALL
$66.9B
| $2.2M | ﹤0.01% |
+19,755
| New | +$2.16M |
|
1990
PUT
Warner Music
WMG
$13.8B
| $2.2M | ﹤0.01% |
70,000
+20,500
| +41% | +$642K |
|
1991
CALL
Bloomin' Brands
BLMN
$680M
| $2.19M | ﹤0.01% |
89,300
-61,800
| -41% | -$1.64M |
|
1992
Coherent
COHR
$55.2B
| $2.19M | ﹤0.01% |
67,177
-33,578
| -33% | -$1.38M |
|
1993
STMicroelectronics
STM
$46B
| $2.19M | ﹤0.01% |
50,769
-37,954
| -43% | -$1.81M |
|
|
JKS
1994
PUT
JinkoSolar
JKS
$775M
| $2.19M | ﹤0.01% |
72,100
+4,800
| +7% | +$172K |
|
1995
CALL
Yeti Holdings
YETI
$3.82B
| $2.19M | ﹤0.01% |
45,400
+19,500
| +75% | +$867K |
|
1996
CALL
AGCO
AGCO
$8.78B
| $2.19M | ﹤0.01% |
18,500
+6,800
| +58% | +$864K |
|
1997
PUT
CONMED
CNMD
$1.29B
| $2.19M | ﹤0.01% |
21,700
+12,900
| +147% | +$1.48M |
|
1998
CALL
Jazz Pharmaceuticals
JAZZ
$15.9B
| $2.19M | ﹤0.01% |
16,900
+6,500
| +63% | +$866K |
|
|
DQ
1999
CALL
Daqo New Energy
DQ
$790M
| $2.19M | ﹤0.01% |
72,200
+64,300
| +814% | +$2.29M |
|
2000
PUT
Kornit Digital
KRNT
$706M
| $2.19M | ﹤0.01% |
115,600
-54,100
| -32% | -$1.33M |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.