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 | |
|---|---|---|---|---|---|---|
1551
PUT
Rapid7
RPD
$634M
| $3.68M | ﹤0.01% |
80,300
+64,300
| +402% | +$2.97M |
|
1552
Vertex Pharmaceuticals
VRTX
$121B
| $3.68M | ﹤0.01% |
10,573
+10,273
| +3,424% | +$3.59M |
|
1553
CALL
Northern Trust
NTRS
$22.2B
| $3.67M | ﹤0.01% |
52,900
+19,100
| +57% | +$1.44M |
|
|
DQ
1554
PUT
Daqo New Energy
DQ
$790M
| $3.67M | ﹤0.01% |
121,300
+61,900
| +104% | +$2.21M |
|
1555
PUT
W.W. Grainger
GWW
$65.3B
| $3.67M | ﹤0.01% |
5,300
-11,300
| -68% | -$8.17M |
|
1556
PUT
Pacific Biosciences
PACB
$422M
| $3.67M | ﹤0.01% |
439,100
+64,400
| +17% | +$736K |
|
|
PPLC
1557
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $3.66M | ﹤0.01% |
812,600
+154,400
| +23% | +$696K |
|
|
VMW
1558
CALL
DELISTED
VMware, Inc
VMW
| $3.66M | ﹤0.01% |
22,000
+7,200
| +49% | +$1.15M |
|
|
AKRO
1559
PUT
DELISTED
Akero Therapeutics
AKRO
| $3.66M | ﹤0.01% |
72,400
+17,700
| +32% | +$824K |
|
1560
Carvana
CVNA
$43.3B
| $3.66M | ﹤0.01% |
+435,820
| New | +$3.75M |
|
1561
CALL
Vodafone
VOD
$34.9B
| $3.66M | ﹤0.01% |
385,800
+39,500
| +11% | +$374K |
|
1562
PUT
Danaos Corp
DAC
$2.55B
| $3.65M | ﹤0.01% |
55,100
+15,900
| +41% | +$1.07M |
|
1563
CALL
YPF
YPF
$20.2B
| $3.65M | ﹤0.01% |
297,600
+112,600
| +61% | +$1.59M |
|
1564
PUT
Zebra Technologies
ZBRA
$12.4B
| $3.64M | ﹤0.01% |
15,400
+10,400
| +208% | +$2.82M |
|
|
EDR
1565
CALL
DELISTED
Endeavor Group Holdings, Inc.
EDR
| $3.64M | ﹤0.01% |
182,900
+160,900
| +731% | +$3.69M |
|
1566
PUT
BioMarin Pharmaceuticals
BMRN
$11.5B
| $3.64M | ﹤0.01% |
41,100
-28,100
| -41% | -$2.5M |
|
1567
PUT
Bright Horizons
BFAM
$3.99B
| $3.63M | ﹤0.01% |
+44,600
| New | +$4.12M |
|
1568
PUT
MarketAxess Holdings
MKTX
$4.15B
| $3.63M | ﹤0.01% |
17,000
+12,300
| +262% | +$2.98M |
|
1569
CALL
Knight Transportation
KNX
$11.8B
| $3.63M | ﹤0.01% |
72,300
-48,300
| -40% | -$2.68M |
|
1570
Canadian Solar
CSIQ
$906M
| $3.62M | ﹤0.01% |
147,226
+37,677
| +34% | +$1.19M |
|
1571
CALL
Sunoco
SUN
$14.2B
| $3.62M | ﹤0.01% |
74,000
+56,600
| +325% | +$2.57M |
|
1572
CALL
Build-A-Bear
BBW
$423M
| $3.62M | ﹤0.01% |
123,000
+108,900
| +772% | +$2.75M |
|
1573
PUT
Enbridge
ENB
$124B
| $3.61M | ﹤0.01% |
108,900
+55,400
| +104% | +$1.97M |
|
1574
CALL
Plains GP Holdings
PAGP
$5.23B
| $3.61M | ﹤0.01% |
224,100
-84,600
| -27% | -$1.33M |
|
1575
PUT
Lithia Motors
LAD
$7.78B
| $3.6M | ﹤0.01% |
12,200
-400
| -3% | -$122K |
|
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.