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 | |
|---|---|---|---|---|---|---|
901
iShares MSCI Emerging Markets ETF
EEM
$28.5B
| $13.7M | 0.01% |
+340,959
| New | +$13.2M |
|
902
PUT
Sherwin-Williams
SHW
$76.5B
| $13.7M | 0.01% |
43,900
+23,300
| +113% | +$6.27M |
|
903
CALL
Zoetis
ZTS
$31.1B
| $13.7M | 0.01% |
69,300
-75,400
| -52% | -$13.3M |
|
904
CALL
Bilibili
BILI
$7.27B
| $13.6M | 0.01% |
1,121,500
+537,000
| +92% | +$7.01M |
|
905
PUT
UBS Group
UBS
$169B
| $13.6M | 0.01% |
441,200
+183,900
| +71% | +$4.84M |
|
906
PepsiCo
PEP
$184B
| $13.6M | 0.01% |
+80,144
| New | +$13.3M |
|
907
CALL
Nice
NICE
$5.07B
| $13.6M | 0.01% |
68,200
-10,600
| -13% | -$1.91M |
|
908
PUT
Prudential Financial
PRU
$40.9B
| $13.6M | 0.01% |
131,200
-34,900
| -21% | -$3.35M |
|
909
PUT
O'Reilly Automotive
ORLY
$71.2B
| $13.6M | 0.01% |
214,500
-43,500
| -17% | -$2.75M |
|
910
CALL
Lamb Weston
LW
$6.79B
| $13.6M | 0.01% |
125,600
+36,700
| +41% | +$3.53M |
|
911
PUT
Cboe Global Markets
CBOE
$30.1B
| $13.6M | 0.01% |
76,000
+25,600
| +51% | +$4.39M |
|
912
CALL
Waste Management
WM
$94.9B
| $13.6M | 0.01% |
75,700
+17,000
| +29% | +$2.85M |
|
913
CALL
Extra Space Storage
EXR
$30.7B
| $13.5M | 0.01% |
84,400
+73,200
| +654% | +$9.31M |
|
914
PUT
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$164M
| $13.5M | 0.01% |
217,975
-52,125
| -19% | -$4.21M |
|
|
MRO
915
CALL
DELISTED
Marathon Oil Corporation
MRO
| $13.5M | 0.01% |
558,100
-164,500
| -23% | -$4.24M |
|
916
CALL
Manchester United
MANU
$3.86B
| $13.4M | 0.01% |
660,000
+395,100
| +149% | +$7.49M |
|
917
CALL
Signet Jewelers
SIG
$3.47B
| $13.4M | 0.01% |
125,400
+95,900
| +325% | +$7.86M |
|
918
PUT
CAVA Group
CAVA
$7.29B
| $13.4M | 0.01% |
312,700
+222,700
| +247% | +$7.76M |
|
919
PUT
British American Tobacco
BTI
$128B
| $13.4M | 0.01% |
458,500
+132,300
| +41% | +$4.03M |
|
920
CALL
Hewlett Packard
HPE
$63B
| $13.4M | 0.01% |
789,800
-90,100
| -10% | -$1.47M |
|
921
PUT
Boston Scientific
BSX
$64.8B
| $13.3M | 0.01% |
230,800
-32,400
| -12% | -$1.73M |
|
|
TYNS
922
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $13.3M | 0.01% |
158,600
-35,100
| -18% | -$2.95M |
|
923
CALL
Plug Power
PLUG
$3.08B
| $13.3M | 0.01% |
2,956,200
+685,200
| +30% | +$3.59M |
|
|
924
PUT
Nice
NICE
$5.07B
| $13.2M | 0.01% |
66,200
+41,700
| +170% | +$7.5M |
|
925
CALL
Exelon
EXC
$48.5B
| $13.2M | 0.01% |
382,600
+36,400
| +11% | +$1.4M |
|
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.