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 | |
|---|---|---|---|---|---|---|
2801
Box
BOX
$4.02B
| $1.25M | ﹤0.01% |
49,010
+44,565
| +1,003% | +$1.13M |
|
2802
PUT
Tencent Music
TME
$14.5B
| $1.25M | ﹤0.01% |
139,300
-19,100
| -12% | -$148K |
|
2803
CALL
Comfort Systems
FIX
$61B
| $1.25M | ﹤0.01% |
6,100
-5,100
| -46% | -$942K |
|
2804
CALL
TeraWulf
WULF
$9.15B
| $1.25M | ﹤0.01% |
522,800
+146,200
| +39% | +$199K |
|
|
NVMI
2805
Nova
NVMI
$13.9B
| $1.25M | ﹤0.01% |
9,107
+5,886
| +183% | +$680K |
|
2806
Kyndryl
KD
$2.66B
| $1.25M | ﹤0.01% |
60,169
+25,570
| +74% | +$437K |
|
2807
PUT
Intellia Therapeutics
NTLA
$1.5B
| $1.25M | ﹤0.01% |
41,000
+38,600
| +1,608% | +$1.11M |
|
|
RAPT
2808
PUT
DELISTED
RAPT Therapeutics
RAPT
| $1.25M | ﹤0.01% |
6,288
+6,163
| +4,930% | +$763K |
|
|
ARI
2809
CALL
Apollo Commercial Real Estate
ARI
$887M
| $1.25M | ﹤0.01% |
106,200
+55,100
| +108% | +$590K |
|
|
SNV
2810
CALL
DELISTED
Synovus
SNV
| $1.25M | ﹤0.01% |
33,100
+11,700
| +55% | +$358K |
|
2811
Elanco Animal Health
ELAN
$12.4B
| $1.25M | ﹤0.01% |
83,574
+3,649
| +5% | +$41.3K |
|
2812
CALL
St. Joe Company
JOE
$3.57B
| $1.25M | ﹤0.01% |
20,700
-10,900
| -34% | -$574K |
|
|
ALTR
2813
CALL
DELISTED
Altair Engineering Inc
ALTR
| $1.25M | ﹤0.01% |
14,800
+13,900
| +1,544% | +$967K |
|
2814
CALL
Star Bulk Carriers
SBLK
$3.14B
| $1.24M | ﹤0.01% |
58,500
+42,400
| +263% | +$836K |
|
|
CVGW
2815
CALL
DELISTED
Calavo Growers
CVGW
| $1.24M | ﹤0.01% |
42,100
+40,700
| +2,907% | +$1.05M |
|
2816
CALL
Equitable Holdings
EQH
$13.1B
| $1.24M | ﹤0.01% |
37,200
+24,600
| +195% | +$720K |
|
|
DCH
2817
CALL
Dauch Corp
DCH
$1.3B
| $1.24M | ﹤0.01% |
140,400
-121,200
| -46% | -$896K |
|
2818
PUT
HDFC Bank
HDB
$119B
| $1.23M | ﹤0.01% |
36,800
-8,800
| -19% | -$265K |
|
2819
Amplify Energy
AMPY
$163M
| $1.23M | ﹤0.01% |
207,737
+106,717
| +106% | +$689K |
|
2820
PUT
3D Systems Corp
DDD
$420M
| $1.23M | ﹤0.01% |
193,600
-4,900
| -2% | -$24.1K |
|
2821
CALL
Par Pacific Holdings
PARR
$3.88B
| $1.23M | ﹤0.01% |
33,800
+8,000
| +31% | +$270K |
|
2822
PUT
C4 Therapeutics
CCCC
$376M
| $1.23M | ﹤0.01% |
217,200
+216,300
| +24,033% | +$493K |
|
|
ARR
2823
CALL
Armour Residential REIT
ARR
$2.02B
| $1.23M | ﹤0.01% |
63,500
+49,040
| +339% | +$865K |
|
2824
PUT
Phreesia
PHR
$632M
| $1.22M | ﹤0.01% |
52,900
+46,500
| +727% | +$802K |
|
|
HPP
2825
Hudson Pacific Properties
HPP
$834M
| $1.22M | ﹤0.01% |
+18,774
| New | +$828K |
|
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.