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 | |
|---|---|---|---|---|---|---|
801
PUT
McKesson
MCK
$96.5B
| $13M | 0.01% |
30,000
+15,800
| +111% | +$6.66M |
|
802
CALL
American International
AIG
$41.4B
| $13M | 0.01% |
214,400
-13,800
| -6% | -$824K |
|
|
CTLT
803
PUT
DELISTED
CATALENT, INC.
CTLT
| $13M | 0.01% |
284,800
-221,200
| -44% | -$10.3M |
|
804
SolarEdge
SEDG
$2.75B
| $13M | 0.01% |
100,068
+91,687
| +1,094% | +$17.6M |
|
805
PUT
Five Below
FIVE
$11.1B
| $12.9M | 0.01% |
80,000
-27,200
| -25% | -$4.97M |
|
806
PUT
Automatic Data Processing
ADP
$97.1B
| $12.9M | 0.01% |
53,500
-36,600
| -41% | -$8.92M |
|
807
CALL
Molson Coors Class B
TAP
$7.51B
| $12.9M | 0.01% |
202,400
+96,600
| +91% | +$6.28M |
|
808
PUT
Yum! Brands
YUM
$40.6B
| $12.9M | 0.01% |
103,000
+48,900
| +90% | +$6.43M |
|
809
CALL
Royal Bank of Canada
RY
$290B
| $12.9M | 0.01% |
147,100
+91,800
| +166% | +$8.54M |
|
810
CALL
Tractor Supply
TSCO
$15.9B
| $12.9M | 0.01% |
316,500
+119,500
| +61% | +$5.18M |
|
811
PUT
GSK
GSK
$102B
| $12.8M | 0.01% |
372,400
-26,800
| -7% | -$951K |
|
812
PUT
Nutrien
NTR
$32.9B
| $12.8M | 0.01% |
206,500
-7,700
| -4% | -$487K |
|
813
PUT
ProShares UltraShort Health Care
RXD
$3.3M
| $12.7M | 0.01% |
187,400
+38,600
| +26% | +$967K |
|
814
PUT
SL Green Realty
SLG
$3.81B
| $12.6M | 0.01% |
338,600
-68,600
| -17% | -$2.46M |
|
815
CALL
Kroger
KR
$34.2B
| $12.6M | 0.01% |
282,200
-13,900
| -5% | -$654K |
|
816
CALL
Equinor
EQNR
$97.4B
| $12.6M | 0.01% |
385,100
-38,300
| -9% | -$1.19M |
|
817
PUT
Applovin
APP
$134B
| $12.6M | 0.01% |
314,800
-24,700
| -7% | -$876K |
|
818
PUT
Whirlpool
WHR
$2.31B
| $12.6M | 0.01% |
94,000
+20,900
| +29% | +$2.95M |
|
819
CALL
HSBC
HSBC
$349B
| $12.5M | 0.01% |
317,900
+44,700
| +16% | +$1.76M |
|
820
CALL
Exelon
EXC
$48.4B
| $12.5M | 0.01% |
346,200
+79,400
| +30% | +$3.24M |
|
821
Moderna
MRNA
$22.6B
| $12.5M | 0.01% |
120,949
+106,352
| +729% | +$11.9M |
|
822
PUT
AB InBev
BUD
$155B
| $12.5M | 0.01% |
225,800
+6,700
| +3% | +$380K |
|
823
PUT
Harley-Davidson
HOG
$2.79B
| $12.4M | 0.01% |
376,300
+60,200
| +19% | +$2.09M |
|
|
824
CALL
Nutrien
NTR
$32.9B
| $12.4M | 0.01% |
201,400
-30,200
| -13% | -$1.91M |
|
825
PUT
AvalonBay Communities
AVB
$27.1B
| $12.4M | 0.01% |
72,400
+32,500
| +81% | +$6.01M |
|
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.