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 | |
|---|---|---|---|---|---|---|
751
PUT
Fidelity National Information Services
FIS
$21B
| $18.5M | 0.01% |
308,000
+206,100
| +202% | +$11.3M |
|
752
PUT
On Holding
ONON
$12.2B
| $18.4M | 0.01% |
682,200
-99,800
| -13% | -$2.72M |
|
753
PUT
Suncor Energy
SU
$76.4B
| $18.4M | 0.01% |
573,800
+180,300
| +46% | +$5.89M |
|
754
CALL
Illumina
ILMN
$28.9B
| $18.4M | 0.01% |
135,490
+24,569
| +22% | +$2.83M |
|
755
CALL
Pan American Silver
PAAS
$19.1B
| $18.3M | 0.01% |
1,176,700
+609,300
| +107% | +$9.12M |
|
756
CALL
Motorola Solutions
MSI
$67.1B
| $18.3M | 0.01% |
58,300
+34,000
| +140% | +$10.3M |
|
757
PUT
Norfolk Southern
NSC
$74.3B
| $18.2M | 0.01% |
77,200
+48,000
| +164% | +$10.1M |
|
758
CALL
UiPath
PATH
$5.54B
| $18.2M | 0.01% |
733,900
+96,700
| +15% | +$1.89M |
|
759
PUT
Abercrombie & Fitch
ANF
$4.27B
| $18.2M | 0.01% |
206,500
+93,800
| +83% | +$6.67M |
|
760
CALL
Tapestry
TPR
$29B
| $18.2M | 0.01% |
494,100
+235,400
| +91% | +$7.25M |
|
761
CALL
Agnico Eagle Mines
AEM
$73.5B
| $18.2M | 0.01% |
331,500
-121,200
| -27% | -$6.06M |
|
|
FISV
762
CALL
Fiserv Inc
FISV
$26.8B
| $18.1M | 0.01% |
136,600
| – | – |
|
763
Sea Limited
SE
$64.2B
| $18.1M | 0.01% |
447,522
+44,209
| +11% | +$1.8M |
|
764
PUT
Eaton
ETN
$158B
| $18.1M | 0.01% |
75,200
-20,800
| -22% | -$4.59M |
|
765
CALL
Jabil
JBL
$33.4B
| $18.1M | 0.01% |
142,000
+26,400
| +23% | +$3.36M |
|
766
CALL
Vale
VALE
$63.2B
| $18.1M | 0.01% |
1,139,500
-1,952,100
| -63% | -$28M |
|
|
ANSS
767
PUT
DELISTED
Ansys
ANSS
| $18.1M | 0.01% |
49,800
+41,400
| +493% | +$12.3M |
|
|
AYX
768
PUT
DELISTED
Alteryx Inc
AYX
| $18M | 0.01% |
382,500
-60,700
| -14% | -$2.36M |
|
769
CALL
Corning
GLW
$133B
| $18M | 0.01% |
590,900
+154,000
| +35% | +$4.4M |
|
770
PUT
KB Home
KBH
$3.46B
| $17.9M | 0.01% |
285,900
-244,700
| -46% | -$12.6M |
|
771
PUT
XPeng
XPEV
$12.3B
| $17.8M | 0.01% |
1,222,800
-168,100
| -12% | -$2.67M |
|
772
PUT
eBay
EBAY
$49.3B
| $17.8M | 0.01% |
407,600
+184,600
| +83% | +$7.64M |
|
773
PUT
LyondellBasell Industries
LYB
$20.1B
| $17.8M | 0.01% |
186,900
-100
| -0.1% | -$9.35K |
|
774
CALL
Enterprise Products Partners
EPD
$84.1B
| $17.7M | 0.01% |
672,600
+153,100
| +29% | +$4.08M |
|
775
CALL
Darden Restaurants
DRI
$22.2B
| $17.6M | 0.01% |
107,300
-63,100
| -37% | -$9.55M |
|
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.