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 | |
|---|---|---|---|---|---|---|
801
CALL
Mondelez International
MDLZ
$77.2B
| $16.7M | 0.01% |
230,300
-67,200
| -23% | -$4.61M |
|
802
CALL
Shift4
FOUR
$3.7B
| $16.6M | 0.01% |
223,600
+135,400
| +154% | +$8.08M |
|
803
CALL
ProShares Ultra S&P500
SSO
$7.83B
| $16.5M | 0.01% |
487,200
+46,400
| +11% | +$1.33M |
|
804
PUT
Lithia Motors
LAD
$7.69B
| $16.5M | 0.01% |
50,000
+37,800
| +310% | +$10.4M |
|
805
MongoDB
MDB
$24.2B
| $16.5M | 0.01% |
40,247
+26,073
| +184% | +$9.89M |
|
806
PUT
Chubb
CB
$134B
| $16.5M | 0.01% |
72,800
+28,300
| +64% | +$6.19M |
|
807
PUT
The Mosaic Company
MOS
$7.2B
| $16.4M | 0.01% |
458,700
+51,400
| +13% | +$1.82M |
|
808
PUT
Wolfspeed
WOLF
$1.41B
| $16.3M | 0.01% |
374,300
-121,100
| -24% | -$4.39M |
|
809
PUT
Axos Financial
AX
$5.41B
| $16.3M | 0.01% |
298,200
+50,100
| +20% | +$2.09M |
|
|
WCC
810
PUT
WESCO International
WCC
$16.1B
| $16.3M | 0.01% |
93,500
+21,700
| +30% | +$3.25M |
|
811
PUT
Sphere Entertainment
SPHR
$4.95B
| $16.2M | 0.01% |
478,400
+446,600
| +1,404% | +$15.5M |
|
812
CALL
Canadian Natural Resources
CNQ
$98.1B
| $16.2M | 0.01% |
499,000
+41,600
| +9% | +$1.35M |
|
813
PUT
Tenet Healthcare
THC
$16.7B
| $16.2M | 0.01% |
214,300
+5,400
| +3% | +$342K |
|
814
CALL
Teladoc Health
TDOC
$1.56B
| $16.1M | 0.01% |
749,400
-93,100
| -11% | -$1.72M |
|
815
PUT
Akamai
AKAM
$17.8B
| $16.1M | 0.01% |
136,100
+37,100
| +37% | +$4.13M |
|
816
CALL
Five Below
FIVE
$11.3B
| $16.1M | 0.01% |
75,500
+4,900
| +7% | +$900K |
|
817
CALL
MSCI
MSCI
$40.8B
| $16.1M | 0.01% |
28,400
-1,000
| -3% | -$516K |
|
818
PUT
Applovin
APP
$136B
| $16.1M | 0.01% |
402,900
+88,100
| +28% | +$3.45M |
|
819
PUT
Synchrony
SYF
$23B
| $16M | 0.01% |
419,200
+139,600
| +50% | +$4.42M |
|
|
FYBR
820
PUT
DELISTED
Frontier Communications
FYBR
| $16M | 0.01% |
630,700
+522,800
| +485% | +$10.6M |
|
821
PUT
Dominion Energy
D
$62.7B
| $16M | 0.01% |
340,000
+130,000
| +62% | +$5.8M |
|
822
Oracle
ORCL
$357B
| $16M | 0.01% |
151,474
-151,917
| -50% | -$16.6M |
|
|
AXON
823
PUT
Axon Enterprise
AXON
$39.9B
| $16M | 0.01% |
61,800
+9,800
| +19% | +$2.21M |
|
824
PUT
Zebra Technologies
ZBRA
$12.3B
| $16M | 0.01% |
58,400
+43,000
| +279% | +$9.82M |
|
825
PUT
McKesson
MCK
$95.5B
| $15.9M | 0.01% |
34,400
+4,400
| +15% | +$2M |
|
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.