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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1951
PUT
Fidelity National Information Services
FIS
$21.5B
| $2.91M | ﹤0.01% |
34,700
-148,200
| -81% | -$11.7M |
|
1952
CALL
Gaming and Leisure Properties
GLPI
$12.8B
| $2.9M | ﹤0.01% |
56,300
+16,200
| +40% | +$803K |
|
1953
Coupang
CPNG
$27.8B
| $2.89M | ﹤0.01% |
+117,903
| New | +$2.62M |
|
1954
CALL
Children's Place
PLCE
$53.6M
| $2.89M | ﹤0.01% |
186,800
+10,400
| +6% | +$92K |
|
1955
CALL
PBF Energy
PBF
$7.29B
| $2.89M | ﹤0.01% |
93,400
+1,900
| +2% | +$69K |
|
1956
PUT
Universal Health Services
UHS
$9.43B
| $2.88M | ﹤0.01% |
12,600
-2,800
| -18% | -$603K |
|
1957
PUT
Regency Centers
REG
$15B
| $2.88M | ﹤0.01% |
39,900
-100
| -0.3% | -$6.92K |
|
1958
Home Depot
HD
$332B
| $2.88M | ﹤0.01% |
7,107
-8,805
| -55% | -$3.21M |
|
1959
CALL
Idexx Laboratories
IDXX
$42.9B
| $2.88M | ﹤0.01% |
5,700
-8,100
| -59% | -$3.94M |
|
1960
Invesco
IVZ
$13.3B
| $2.87M | ﹤0.01% |
163,635
+8,569
| +6% | +$141K |
|
1961
CALL
Mattel
MAT
$4.17B
| $2.87M | ﹤0.01% |
150,800
-900
| -0.6% | -$16.6K |
|
1962
CALL
Ares Capital
ARCC
$13.5B
| $2.87M | ﹤0.01% |
136,900
-51,900
| -27% | -$1.08M |
|
1963
PUT
Qiagen
QGEN
$8.53B
| $2.87M | ﹤0.01% |
+61,153
| New | +$2.79M |
|
1964
PUT
Jack in the Box
JACK
$278M
| $2.86M | ﹤0.01% |
61,400
+57,600
| +1,516% | +$2.89M |
|
1965
PUT
CoreCivic
CXW
$3.1B
| $2.85M | ﹤0.01% |
225,700
+76,000
| +51% | +$1.01M |
|
1966
CALL
Mettler-Toledo International
MTD
$26.8B
| $2.85M | ﹤0.01% |
1,900
+1,100
| +138% | +$1.54M |
|
1967
QuantumScape Corp
QS
$3B
| $2.85M | ﹤0.01% |
495,471
-170,608
| -26% | -$1.05M |
|
1968
Mobileye
MBLY
$2.03B
| $2.85M | ﹤0.01% |
207,785
-67,663
| -25% | -$1.19M |
|
1969
CALL
CVR Partners
UAN
$1.3B
| $2.85M | ﹤0.01% |
42,400
+21,600
| +104% | +$1.57M |
|
1970
PUT
Bread Financial
BFH
$4.21B
| $2.85M | ﹤0.01% |
59,800
+7,700
| +15% | +$392K |
|
1971
CALL
American Conservative Values ETF
ACVF
$149M
| $2.84M | ﹤0.01% |
176,900
+134,400
| +316% | +$5.64M |
|
1972
PUT
Blue Owl Capital
OWL
$6.39B
| $2.83M | ﹤0.01% |
146,400
+26,200
| +22% | +$468K |
|
1973
CALL
Halozyme
HALO
$9.72B
| $2.83M | ﹤0.01% |
49,500
+15,300
| +45% | +$877K |
|
|
HOLX
1974
CALL
DELISTED
Hologic
HOLX
| $2.83M | ﹤0.01% |
34,700
+26,300
| +313% | +$2.1M |
|
1975
CALL
Virtu Financial
VIRT
$5.2B
| $2.83M | ﹤0.01% |
92,800
-10,400
| -10% | -$296K |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.