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 | |
|---|---|---|---|---|---|---|
1076
PUT
Nutrien
NTR
$32.9B
| $10.1M | 0.01% |
179,800
-26,700
| -13% | -$1.51M |
|
1077
CALL
Peloton Interactive
PTON
$2.61B
| $10.1M | 0.01% |
1,656,400
+38,000
| +2% | +$205K |
|
1078
PUT
Cummins
CMI
$91.8B
| $10.1M | 0.01% |
42,100
-18,200
| -30% | -$4.14M |
|
|
MPT
1079
CALL
Medical Properties Trust
MPT
$2.87B
| $10.1M | 0.01% |
2,053,500
+942,600
| +85% | +$4.62M |
|
1080
PUT
Equinix
EQIX
$102B
| $10.1M | 0.01% |
12,500
-2,400
| -16% | -$1.84M |
|
1081
Spotify
SPOT
$96.4B
| $10.1M | 0.01% |
53,552
+49,970
| +1,395% | +$8.73M |
|
1082
CALL
State Street
STT
$50.6B
| $10.1M | 0.01% |
129,900
-9,300
| -7% | -$648K |
|
1083
PUT
AES
AES
$10.6B
| $10.1M | 0.01% |
522,700
+262,800
| +101% | +$4.27M |
|
1084
CALL
TransUnion
TRU
$14.2B
| $10M | 0.01% |
145,500
+140,300
| +2,698% | +$8.54M |
|
1085
CALL
YPF
YPF
$20.4B
| $9.99M | 0.01% |
581,000
+283,400
| +95% | +$3.9M |
|
1086
CALL
Olin
OLN
$2.69B
| $9.99M | 0.01% |
185,100
+154,700
| +509% | +$7.41M |
|
1087
Mercado Libre
MELI
$91.2B
| $9.97M | 0.01% |
6,345
+5,938
| +1,459% | +$8.42M |
|
1088
PUT
Novartis
NVS
$297B
| $9.94M | 0.01% |
323,100
+33,500
| +12% | +$3.23M |
|
1089
CALL
Centene
CNC
$31.5B
| $9.93M | 0.01% |
133,800
+6,600
| +5% | +$476K |
|
1090
PUT
Jabil
JBL
$33.7B
| $9.9M | 0.01% |
77,700
+48,300
| +164% | +$6.15M |
|
1091
PUT
Bank of Montreal
BMO
$124B
| $9.89M | 0.01% |
100,000
+53,800
| +116% | +$4.49M |
|
1092
PUT
Rapid7
RPD
$639M
| $9.88M | 0.01% |
173,100
+92,800
| +116% | +$4.85M |
|
1093
PUT
Tradeweb Markets
TW
$21.3B
| $9.88M | 0.01% |
108,700
+105,100
| +2,919% | +$9.38M |
|
1094
CALL
International Paper
IP
$20.1B
| $9.87M | 0.01% |
273,100
+29,800
| +12% | +$1.04M |
|
|
SAVE
1095
CALL
DELISTED
Spirit Airlines, Inc.
SAVE
| $9.87M | 0.01% |
602,300
+518,600
| +620% | +$7.46M |
|
1096
PUT
International Flavors & Fragrances
IFF
$18.8B
| $9.84M | 0.01% |
121,500
-17,300
| -12% | -$1.25M |
|
1097
PUT
ResMed
RMD
$27.8B
| $9.82M | 0.01% |
57,100
+26,500
| +87% | +$4.07M |
|
1098
PUT
Bilibili
BILI
$7.32B
| $9.82M | 0.01% |
806,700
+209,900
| +35% | +$2.74M |
|
1099
CALL
Parker-Hannifin
PH
$124B
| $9.81M | 0.01% |
21,300
+6,400
| +43% | +$2.66M |
|
1100
CALL
KB Home
KBH
$3.41B
| $9.81M | 0.01% |
157,000
+27,800
| +22% | +$1.43M |
|
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.