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 | |
|---|---|---|---|---|---|---|
1101
Energy Transfer Partners
ET
$70.3B
| $9M | 0.01% |
560,682
+57,128
| +11% | +$919K |
|
1102
PUT
Paycom
PAYC
$6.69B
| $8.98M | 0.01% |
53,900
-5,400
| -9% | -$864K |
|
1103
CALL
Doximity
DOCS
$3.69B
| $8.96M | 0.01% |
205,600
+72,400
| +54% | +$2.41M |
|
1104
PUT
ProShares Ultra S&P500
SSO
$7.81B
| $8.95M | 0.01% |
198,200
+62,200
| +46% | +$2.62M |
|
1105
PUT
Citizens Financial Group
CFG
$30.3B
| $8.94M | 0.01% |
217,600
-106,600
| -33% | -$4.31M |
|
|
RDFN
1106
PUT
DELISTED
Redfin
RDFN
| $8.93M | 0.01% |
712,300
+536,400
| +305% | +$4.93M |
|
1107
PUT
Axsome Therapeutics
AXSM
$12.4B
| $8.91M | 0.01% |
99,100
+72,700
| +275% | +$6.35M |
|
1108
CALL
Franco-Nevada
FNV
$41.5B
| $8.88M | 0.01% |
71,500
-70,600
| -50% | -$8.74M |
|
1109
CALL
Burlington
BURL
$21.4B
| $8.88M | 0.01% |
33,700
-9,900
| -23% | -$2.56M |
|
1110
PUT
Avantor
AVTR
$7.8B
| $8.87M | 0.01% |
342,900
+125,200
| +58% | +$3.07M |
|
|
PARA
1111
CALL
DELISTED
Paramount Global Class B
PARA
| $8.87M | 0.01% |
833,400
-948,100
| -53% | -$10.3M |
|
1112
PUT
DaVita
DVA
$15.1B
| $8.87M | 0.01% |
54,100
-92,600
| -63% | -$13.7M |
|
1113
CALL
Global E Online
GLBE
$5.93B
| $8.87M | 0.01% |
230,700
+56,300
| +32% | +$1.98M |
|
1114
CALL
HSBC
HSBC
$354B
| $8.87M | 0.01% |
196,200
+108,500
| +124% | +$4.7M |
|
1115
CALL
Targa Resources
TRGP
$62.1B
| $8.84M | 0.01% |
59,700
-6,100
| -9% | -$858K |
|
1116
PUT
argenx
ARGX
$57.7B
| $8.84M | 0.01% |
16,300
-4,200
| -20% | -$2.12M |
|
1117
PUT
Cytokinetics
CYTK
$11B
| $8.83M | 0.01% |
167,300
+62,800
| +60% | +$3.5M |
|
|
DFS
1118
PUT
DELISTED
Discover Financial Services
DFS
| $8.82M | 0.01% |
62,900
+19,900
| +46% | +$2.68M |
|
1119
CALL
BJs Wholesale Club
BJ
$11.8B
| $8.82M | 0.01% |
106,900
-5,300
| -5% | -$448K |
|
1120
CALL
Williams-Sonoma
WSM
$26B
| $8.81M | 0.01% |
56,900
-13,300
| -19% | -$1.91M |
|
1121
CALL
WisdomTree US Total Dividend Fund
DTD
$1.64B
| $8.8M | 0.01% |
85,200
+38,400
| +82% | +$2.83M |
|
1122
PUT
Monster Beverage
MNST
$91.4B
| $8.78M | 0.01% |
168,300
+77,100
| +85% | +$3.82M |
|
1123
CALL
Stellantis
STLA
$16.4B
| $8.77M | 0.01% |
624,000
+384,800
| +161% | +$6.54M |
|
1124
PUT
State Street
STT
$50.7B
| $8.77M | 0.01% |
99,100
+9,400
| +10% | +$775K |
|
1125
Fortinet
FTNT
$112B
| $8.75M | 0.01% |
112,855
-172,763
| -60% | -$11.8M |
|
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.