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 | |
|---|---|---|---|---|---|---|
|
NNDM
3226
CALL
Nano Dimension
NNDM
$314M
| $804K | ﹤0.01% |
335,400
-30,000
| -8% | -$75.5K |
|
3227
PUT
IPG Photonics
IPGP
$3.87B
| $803K | ﹤0.01% |
7,400
+1,800
| +32% | +$174K |
|
3228
PUT
CoreCivic
CXW
$3.12B
| $802K | ﹤0.01% |
55,200
+31,600
| +134% | +$418K |
|
3229
CALL
Voya Financial
VOYA
$9B
| $802K | ﹤0.01% |
11,000
+2,000
| +22% | +$139K |
|
3230
CALL
PAR Technology
PAR
$671M
| $801K | ﹤0.01% |
18,400
-136,200
| -88% | -$5.11M |
|
3231
Vestis
VSTS
$2.09B
| $801K | ﹤0.01% |
+37,907
| New | +$651K |
|
3232
Ares Management
ARES
$29.4B
| $800K | ﹤0.01% |
+6,731
| New | +$731K |
|
3233
CALL
Jefferies Financial Group
JEF
$13.2B
| $800K | ﹤0.01% |
20,900
-1,900
| -8% | -$67.2K |
|
3234
Tradr 2X Long Innovation ETFShort Innovation Daily ETF
SARK
$43.5M
| $800K | ﹤0.01% |
+10,280
| New | +$1.12M |
|
3235
CALL
EPR Properties
EPR
$4.89B
| $799K | ﹤0.01% |
16,500
+8,100
| +96% | +$361K |
|
3236
CALL
ITT
ITT
$17.6B
| $799K | ﹤0.01% |
6,700
+400
| +6% | +$42.1K |
|
3237
CALL
Walker & Dunlop
WD
$1.68B
| $799K | ﹤0.01% |
7,200
-400
| -5% | -$32.8K |
|
3238
CALL
Intellia Therapeutics
NTLA
$1.57B
| $798K | ﹤0.01% |
26,200
+9,500
| +57% | +$273K |
|
|
NVRO
3239
DELISTED
NEVRO CORP.
NVRO
| $798K | ﹤0.01% |
37,092
+18,873
| +104% | +$337K |
|
3240
CALL
Delek US
DK
$3.85B
| $797K | ﹤0.01% |
30,900
-1,100
| -3% | -$29.1K |
|
3241
PUT
First Horizon
FHN
$12.2B
| $795K | ﹤0.01% |
56,200
-21,400
| -28% | -$258K |
|
3242
PUT
Hartford Financial Services
HIG
$38.8B
| $795K | ﹤0.01% |
9,900
+2,700
| +38% | +$203K |
|
3243
PUT
International Paper
IP
$22.7B
| $795K | ﹤0.01% |
22,000
-26,600
| -55% | -$930K |
|
3244
10x Genomics
TXG
$5.95B
| $794K | ﹤0.01% |
14,200
+1,468
| +12% | +$63.9K |
|
|
ITCI
3245
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $794K | ﹤0.01% |
+11,095
| New | +$638K |
|
3246
Dolby
DLB
$4.79B
| $792K | ﹤0.01% |
+9,200
| New | +$776K |
|
3247
PUT
Group 1 Automotive
GPI
$4.04B
| $792K | ﹤0.01% |
2,600
+1,700
| +189% | +$463K |
|
3248
CALL
Weibo
WB
$1.93B
| $791K | ﹤0.01% |
72,300
+10,500
| +17% | +$119K |
|
3249
Hecla Mining
HL
$10.2B
| $790K | ﹤0.01% |
+164,324
| New | +$725K |
|
3250
PUT
Warner Music
WMG
$14.3B
| $790K | ﹤0.01% |
22,100
-47,900
| -68% | -$1.58M |
|
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.