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 | |
|---|---|---|---|---|---|---|
2076
CALL
FLEX LNG
FLNG
$1.67B
| $2.78M | ﹤0.01% |
95,800
-600
| -0.6% | -$18K |
|
2077
PUT
Mid-America Apartment Communities
MAA
$15.6B
| $2.78M | ﹤0.01% |
20,700
+4,600
| +29% | +$585K |
|
2078
CALL
ACM Research
ACMR
$5.83B
| $2.78M | ﹤0.01% |
142,400
-86,800
| -38% | -$1.52M |
|
2079
PUT
Western Union
WU
$2.57B
| $2.78M | ﹤0.01% |
233,200
+186,900
| +404% | +$2.28M |
|
2080
PUT
Array Technologies
ARRY
$818M
| $2.77M | ﹤0.01% |
165,200
+105,900
| +179% | +$1.83M |
|
2081
BlackLine
BL
$1.69B
| $2.77M | ﹤0.01% |
44,452
+9,680
| +28% | +$547K |
|
2082
Sphere Entertainment
SPHR
$4.88B
| $2.77M | ﹤0.01% |
81,629
+63,255
| +344% | +$2.2M |
|
2083
CALL
Louisiana-Pacific
LPX
$5.2B
| $2.77M | ﹤0.01% |
39,100
-28,400
| -42% | -$1.7M |
|
2084
CALL
Sensata Technologies
ST
$6.65B
| $2.77M | ﹤0.01% |
73,600
+70,900
| +2,626% | +$2.45M |
|
2085
CALL
FirstEnergy
FE
$28.9B
| $2.76M | ﹤0.01% |
75,400
-44,500
| -37% | -$1.61M |
|
2086
Marvell Technology
MRVL
$174B
| $2.76M | ﹤0.01% |
45,804
-100,356
| -69% | -$5.42M |
|
2087
CALL
Rollins
ROL
$18.6B
| $2.76M | ﹤0.01% |
63,200
+46,100
| +270% | +$1.79M |
|
2088
PUT
Regal Rexnord
RRX
$14.2B
| $2.75M | ﹤0.01% |
18,600
+10,500
| +130% | +$1.32M |
|
2089
PUT
Paylocity
PCTY
$6.71B
| $2.75M | ﹤0.01% |
16,700
+16,000
| +2,286% | +$2.69M |
|
2090
CALL
Vipshop
VIPS
$6.84B
| $2.75M | ﹤0.01% |
155,000
+110,000
| +244% | +$1.72M |
|
2091
BioMarin Pharmaceuticals
BMRN
$11.5B
| $2.75M | ﹤0.01% |
+28,503
| New | +$2.52M |
|
|
HAPN
2092
CALL
Happen Inc
HAPN
$2.08B
| $2.75M | ﹤0.01% |
314,400
+223,600
| +246% | +$1.41M |
|
2093
CALL
Vermilion Energy
VET
$1.73B
| $2.75M | ﹤0.01% |
227,800
-85,900
| -27% | -$1.14M |
|
|
SIX
2094
PUT
DELISTED
Six Flags Entertainment Corp.
SIX
| $2.75M | ﹤0.01% |
109,500
-99,600
| -48% | -$2.3M |
|
2095
CALL
FirstCash
FCFS
$8.55B
| $2.74M | ﹤0.01% |
25,300
+17,500
| +224% | +$1.89M |
|
2096
Evolent Health
EVH
$475M
| $2.72M | ﹤0.01% |
+82,478
| New | +$2.33M |
|
2097
CALL
Magnite
MGNI
$2.65B
| $2.72M | ﹤0.01% |
291,700
-5,300
| -2% | -$41.9K |
|
2098
CALL
Nokia
NOK
$50.8B
| $2.72M | ﹤0.01% |
796,500
-72,700
| -8% | -$247K |
|
2099
PUT
Ventas
VTR
$48.9B
| $2.72M | ﹤0.01% |
54,600
+22,000
| +67% | +$985K |
|
2100
PUT
Yum China
YUMC
$14.9B
| $2.72M | ﹤0.01% |
64,100
+34,900
| +120% | +$1.62M |
|
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.