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 | |
|---|---|---|---|---|---|---|
1376
Verizon
VZ
$189B
| $6.34M | ﹤0.01% |
168,326
-934,889
| -85% | -$33.1M |
|
1377
PUT
Alaska Air
ALK
$5.23B
| $6.34M | ﹤0.01% |
162,300
+139,300
| +606% | +$4.97M |
|
1378
CALL
Ambarella
AMBA
$2.97B
| $6.31M | ﹤0.01% |
103,000
+14,300
| +16% | +$781K |
|
1379
PUT
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $6.31M | ﹤0.01% |
268,400
-161,800
| -38% | -$4.73M |
|
1380
CALL
Charles River Laboratories
CRL
$11B
| $6.31M | ﹤0.01% |
26,700
+13,100
| +96% | +$2.58M |
|
1381
CALL
Yum! Brands
YUM
$41B
| $6.31M | ﹤0.01% |
48,300
+11,700
| +32% | +$1.46M |
|
1382
PUT
OneMain Financial
OMF
$6.91B
| $6.31M | ﹤0.01% |
128,200
+40,000
| +45% | +$1.63M |
|
1383
DaVita
DVA
$15.2B
| $6.3M | ﹤0.01% |
+60,186
| New | +$5.56M |
|
1384
CALL
Commercial Metals
CMC
$7.7B
| $6.3M | ﹤0.01% |
125,900
+63,100
| +100% | +$2.87M |
|
1385
PUT
StoneCo
STNE
$2.69B
| $6.3M | ﹤0.01% |
349,300
+201,300
| +136% | +$2.65M |
|
|
BBBY
1386
PUT
Bed Bath & Beyond
BBBY
$486M
| $6.29M | ﹤0.01% |
250,030
+121,770
| +95% | +$2.1M |
|
1387
CALL
Goodyear
GT
$2.07B
| $6.29M | ﹤0.01% |
439,300
+181,400
| +70% | +$2.41M |
|
|
IMGN
1388
DELISTED
Immunogen Inc
IMGN
| $6.27M | ﹤0.01% |
211,467
+967
| +0.5% | +$19.3K |
|
1389
CALL
International Flavors & Fragrances
IFF
$19.4B
| $6.25M | ﹤0.01% |
77,200
-65,600
| -46% | -$4.74M |
|
1390
NIO
NIO
$11.4B
| $6.25M | ﹤0.01% |
688,992
-1,267,790
| -65% | -$10.1M |
|
1391
PUT
Revvity
RVTY
$12.4B
| $6.24M | ﹤0.01% |
57,100
+33,200
| +139% | +$3.2M |
|
1392
PUT
Williams Companies
WMB
$91.2B
| $6.24M | ﹤0.01% |
179,200
+77,900
| +77% | +$2.73M |
|
1393
PUT
Manchester United
MANU
$3.93B
| $6.24M | ﹤0.01% |
306,100
+220,200
| +256% | +$4.18M |
|
1394
CALL
Nutanix
NTNX
$14.7B
| $6.24M | ﹤0.01% |
130,800
-277,000
| -68% | -$11.2M |
|
1395
CALL
Polaris
PII
$4.18B
| $6.23M | ﹤0.01% |
65,700
-800
| -1% | -$73.3K |
|
1396
Sony
SONY
$124B
| $6.22M | ﹤0.01% |
328,415
+119,170
| +57% | +$2.07M |
|
1397
CALL
ChargePoint
CHPT
$136M
| $6.18M | ﹤0.01% |
132,095
+26,520
| +25% | +$1.48M |
|
|
CNR
1398
CALL
Core Natural Resources Inc
CNR
$4.27B
| $6.18M | ﹤0.01% |
61,500
+4,400
| +8% | +$447K |
|
1399
Crocs
CROX
$6.71B
| $6.17M | ﹤0.01% |
66,063
+40,155
| +155% | +$3.71M |
|
1400
CALL
Genuine Parts
GPC
$17B
| $6.16M | ﹤0.01% |
44,500
+4,900
| +12% | +$672K |
|
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.