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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1026
PUT
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.3M
| $11M | 0.01% |
577,500
-535,300
| -48% | -$48.4M |
|
1027
RTX Corp
RTX
$282B
| $10.9M | 0.01% |
+129,990
| New | +$10.3M |
|
1028
PUT
Emerson Electric
EMR
$81.2B
| $10.9M | 0.01% |
111,800
+33,700
| +43% | +$3.09M |
|
1029
PUT
Bumble
BMBL
$364M
| $10.9M | 0.01% |
737,500
+648,400
| +728% | +$9.2M |
|
1030
PUT
Sempra
SRE
$61.1B
| $10.9M | 0.01% |
145,400
+12,800
| +10% | +$916K |
|
1031
CALL
Ross Stores
ROST
$74.5B
| $10.8M | 0.01% |
78,300
-700
| -0.9% | -$87.2K |
|
1032
CALL
Rocket Companies
RKT
$36.2B
| $10.8M | 0.01% |
747,200
+401,900
| +116% | +$3.85M |
|
1033
iShares MSCI EAFE ETF
EFA
$76.1B
| $10.8M | 0.01% |
143,367
+62,839
| +78% | +$4.44M |
|
|
GAP
1034
CALL
The Gap Inc
GAP
$6.8B
| $10.8M | 0.01% |
516,500
+227,900
| +79% | +$3.67M |
|
1035
PUT
Cencora
COR
$59.4B
| $10.8M | 0.01% |
52,500
-29,500
| -36% | -$5.76M |
|
1036
CALL
Tractor Supply
TSCO
$15.9B
| $10.8M | 0.01% |
250,500
-66,000
| -21% | -$2.7M |
|
1037
CALL
Carrier Global
CARR
$57.4B
| $10.7M | 0.01% |
186,200
-35,100
| -16% | -$1.86M |
|
1038
PUT
C.H. Robinson
CHRW
$24.2B
| $10.7M | 0.01% |
123,800
+62,000
| +100% | +$5.2M |
|
1039
PUT
GSK
GSK
$102B
| $10.7M | 0.01% |
308,700
-63,700
| -17% | -$2.29M |
|
1040
PUT
Kohl's
KSS
$2.06B
| $10.7M | 0.01% |
372,000
-218,000
| -37% | -$5.11M |
|
1041
CALL
Coupang
CPNG
$28.1B
| $10.7M | 0.01% |
658,800
+71,000
| +12% | +$1.17M |
|
1042
Enphase Energy
ENPH
$5.13B
| $10.6M | 0.01% |
80,468
+79,972
| +16,123% | +$8.48M |
|
|
WCC
1043
CALL
WESCO International
WCC
$16.1B
| $10.6M | 0.01% |
61,000
+12,600
| +26% | +$1.89M |
|
1044
PUT
Transocean
RIG
$5.89B
| $10.6M | 0.01% |
1,668,900
-34,900
| -2% | -$234K |
|
1045
CALL
L3Harris
LHX
$55.8B
| $10.6M | 0.01% |
50,300
-30,100
| -37% | -$5.65M |
|
|
EXAS
1046
CALL
DELISTED
Exact Sciences
EXAS
| $10.6M | 0.01% |
143,200
+26,300
| +22% | +$1.72M |
|
1047
CALL
Trip.com Group
TCOM
$27.1B
| $10.6M | 0.01% |
294,100
-193,700
| -40% | -$6.61M |
|
1048
PUT
PG&E
PCG
$38.6B
| $10.6M | 0.01% |
586,600
-601,500
| -51% | -$10.2M |
|
1049
PUT
Plug Power
PLUG
$3.06B
| $10.6M | 0.01% |
2,346,600
+559,400
| +31% | +$2.93M |
|
1050
Marathon Petroleum
MPC
$91.2B
| $10.5M | 0.01% |
+71,045
| New | +$10.6M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.