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 | |
|---|---|---|---|---|---|---|
2376
PUT
Madrigal Pharmaceuticals
MDGL
$12.6B
| $1.94M | ﹤0.01% |
8,400
-6,800
| -45% | -$1.19M |
|
2377
PUT
EPR Properties
EPR
$4.86B
| $1.94M | ﹤0.01% |
40,100
+23,600
| +143% | +$1.05M |
|
2378
CALL
Idexx Laboratories
IDXX
$42.9B
| $1.94M | ﹤0.01% |
3,500
-8,600
| -71% | -$4.04M |
|
2379
CALL
Tecnoglass
TGLS
$2.01B
| $1.93M | ﹤0.01% |
42,300
+5,300
| +14% | +$192K |
|
2380
PUT
Children's Place
PLCE
$53.6M
| $1.93M | ﹤0.01% |
83,200
+45,100
| +118% | +$1.1M |
|
2381
CALL
Ardelyx
ARDX
$1.24B
| $1.93M | ﹤0.01% |
311,300
+124,000
| +66% | +$556K |
|
2382
PUT
Kyndryl
KD
$2.66B
| $1.93M | ﹤0.01% |
92,900
+57,200
| +160% | +$977K |
|
2383
PUT
QuidelOrtho
QDEL
$1.09B
| $1.93M | ﹤0.01% |
26,200
+20,700
| +376% | +$1.4M |
|
|
LTHM
2384
DELISTED
Livent Corporation
LTHM
| $1.93M | ﹤0.01% |
107,125
+104,475
| +3,942% | +$1.63M |
|
2385
PUT
Aecom
ACM
$9.07B
| $1.92M | ﹤0.01% |
20,800
+17,100
| +462% | +$1.45M |
|
2386
CALL
Warrior Met Coal
HCC
$4.23B
| $1.92M | ﹤0.01% |
31,500
+7,100
| +29% | +$375K |
|
2387
Banco Macro
BMA
$5.7B
| $1.92M | ﹤0.01% |
66,834
+32,871
| +97% | +$750K |
|
2388
Herbalife
HLF
$1.23B
| $1.92M | ﹤0.01% |
125,734
+75,226
| +149% | +$1.04M |
|
2389
Tradeweb Markets
TW
$21.3B
| $1.92M | ﹤0.01% |
21,109
+18,710
| +780% | +$1.67M |
|
2390
PUT
Birkenstock
BIRK
$7.47B
| $1.92M | ﹤0.01% |
+39,300
| New | +$1.7M |
|
2391
CALL
EyePoint Inc
EYPT
$1.02B
| $1.92M | ﹤0.01% |
82,900
+54,700
| +194% | +$611K |
|
2392
CALL
Choice Hotels
CHH
$5.03B
| $1.91M | ﹤0.01% |
16,900
+16,600
| +5,533% | +$1.9M |
|
2393
CALL
Zebra Technologies
ZBRA
$12.4B
| $1.91M | ﹤0.01% |
7,000
-41,600
| -86% | -$9.5M |
|
|
GTM
2394
ZoomInfo Technologies
GTM
$861M
| $1.91M | ﹤0.01% |
103,248
+70,552
| +216% | +$1.11M |
|
2395
Booking.com
BKNG
$138B
| $1.91M | ﹤0.01% |
13,450
-39,900
| -75% | -$4.98M |
|
2396
PUT
Magna International
MGA
$17.9B
| $1.91M | ﹤0.01% |
32,300
-57,200
| -64% | -$3.09M |
|
2397
CALL
Teekay Tankers
TNK
$2.63B
| $1.91M | ﹤0.01% |
38,200
+21,700
| +132% | +$1.04M |
|
2398
Arthur J. Gallagher & Co
AJG
$63.7B
| $1.91M | ﹤0.01% |
8,481
+3,887
| +85% | +$921K |
|
2399
PUT
Radware
RDWR
$1.24B
| $1.91M | ﹤0.01% |
114,300
+65,500
| +134% | +$1.04M |
|
2400
Amylyx Pharmaceuticals
AMLX
$2.05B
| $1.91M | ﹤0.01% |
129,422
+106,870
| +474% | +$1.64M |
|
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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.