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 | |
|---|---|---|---|---|---|---|
1751
PUT
WD-40
WDFC
$3.1B
| $4.04M | ﹤0.01% |
16,900
-6,200
| -27% | -$1.38M |
|
1752
CALL
Fluor
FLR
$7.29B
| $4.02M | ﹤0.01% |
102,700
-11,000
| -10% | -$406K |
|
1753
PUT
InMode
INMD
$872M
| $4.02M | ﹤0.01% |
180,800
+48,800
| +37% | +$1.1M |
|
1754
PUT
Charles River Laboratories
CRL
$10.9B
| $4.02M | ﹤0.01% |
17,000
-2,900
| -15% | -$570K |
|
|
FL
1755
DELISTED
Foot Locker
FL
| $4.02M | ﹤0.01% |
129,004
-60,923
| -32% | -$1.47M |
|
1756
CALL
Bausch Health
BHC
$1.65B
| $4.01M | ﹤0.01% |
499,700
-61,400
| -11% | -$447K |
|
1757
CALL
PVH
PVH
$3.71B
| $4M | ﹤0.01% |
32,800
-11,200
| -25% | -$1M |
|
1758
iShares Russell 1000 Growth ETF
IWF
$122B
| $4M | ﹤0.01% |
52,812
-33,920
| -39% | -$2.4M |
|
1759
PUT
VeriSign
VRSN
$25.3B
| $4M | ﹤0.01% |
19,400
+16,900
| +676% | +$3.52M |
|
1760
Olin
OLN
$2.64B
| $3.99M | ﹤0.01% |
74,019
+65,991
| +822% | +$3.16M |
|
1761
PUT
Marriott Vacations Worldwide
VAC
$3.24B
| $3.99M | ﹤0.01% |
47,000
+34,900
| +288% | +$2.98M |
|
|
BRSL
1762
PUT
Brightstar Lottery PLC
BRSL
$1.91B
| $3.99M | ﹤0.01% |
145,500
-35,300
| -20% | -$989K |
|
1763
PUT
Nasdaq
NDAQ
$51.5B
| $3.98M | ﹤0.01% |
68,400
-49,400
| -42% | -$2.6M |
|
1764
PUT
Trupanion
TRUP
$1.05B
| $3.97M | ﹤0.01% |
130,200
+88,600
| +213% | +$2.35M |
|
1765
PUT
ING
ING
$93.8B
| $3.94M | ﹤0.01% |
262,300
+14,100
| +6% | +$194K |
|
1766
CALL
InterDigital
IDCC
$6.68B
| $3.93M | ﹤0.01% |
36,200
+27,000
| +293% | +$2.5M |
|
|
LOGC
1767
CALL
DELISTED
ContextLogic
LOGC
| $3.93M | ﹤0.01% |
660,500
+60,600
| +10% | +$295K |
|
1768
CALL
Under Armour Class C
UA
$2.92B
| $3.92M | ﹤0.01% |
448,000
-19,000
| -4% | -$137K |
|
|
XIFR
1769
PUT
XPLR Infrastructure LP
XIFR
$1.18B
| $3.92M | ﹤0.01% |
128,900
+60,700
| +89% | +$1.55M |
|
1770
CALL
OSI Systems
OSIS
$3.57B
| $3.91M | ﹤0.01% |
30,300
+30,200
| +30,200% | +$3.6M |
|
1771
CALL
Asana
ASAN
$1.58B
| $3.9M | ﹤0.01% |
205,200
-39,900
| -16% | -$776K |
|
1772
IQVIA
IQV
$34.7B
| $3.89M | ﹤0.01% |
16,813
+10,912
| +185% | +$2.24M |
|
1773
W.P. Carey
WPC
$17.1B
| $3.89M | ﹤0.01% |
+59,991
| New | +$3.46M |
|
1774
CALL
Yum China
YUMC
$14.9B
| $3.88M | ﹤0.01% |
91,400
-5,800
| -6% | -$270K |
|
1775
PUT
Vipshop
VIPS
$6.84B
| $3.88M | ﹤0.01% |
218,300
+89,200
| +69% | +$1.39M |
|
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.