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 | |
|---|---|---|---|---|---|---|
3776
PUT
Arhaus
ARHS
$1.15B
| $466K | ﹤0.01% |
39,400
-42,300
| -52% | -$399K |
|
3777
Global E Online
GLBE
$6.57B
| $466K | ﹤0.01% |
11,761
-7,985
| -40% | -$288K |
|
3778
Rocket Companies
RKT
$39.3B
| $466K | ﹤0.01% |
+32,200
| New | +$308K |
|
3779
CALL
Shattuck Labs
STTK
$638M
| $464K | ﹤0.01% |
+65,200
| New | +$178K |
|
3780
CALL
CarGurus
CARG
$3.27B
| $463K | ﹤0.01% |
19,200
+17,300
| +911% | +$348K |
|
3781
CALL
Church & Dwight Co
CHD
$23.9B
| $463K | ﹤0.01% |
4,900
+1,400
| +40% | +$128K |
|
3782
Cellebrite
CLBT
$3.72B
| $461K | ﹤0.01% |
53,239
+12,697
| +31% | +$98.7K |
|
3783
PUT
IDT Corp
IDT
$1.69B
| $460K | ﹤0.01% |
13,500
+11,800
| +694% | +$348K |
|
|
OPTU
3784
CALL
Optimum Communications Inc
OPTU
$305M
| $458K | ﹤0.01% |
141,100
+4,100
| +3% | +$10.7K |
|
|
GOGL
3785
CALL
DELISTED
Golden Ocean Group
GOGL
| $458K | ﹤0.01% |
47,000
+32,100
| +215% | +$267K |
|
3786
PUT
Hess Midstream
HESM
$5.15B
| $458K | ﹤0.01% |
14,500
-8,100
| -36% | -$248K |
|
3787
CALL
STAAR Surgical
STAA
$1.09B
| $458K | ﹤0.01% |
14,700
-26,700
| -64% | -$959K |
|
|
AMK
3788
CALL
DELISTED
AssetMark Financial Holdings, Inc.
AMK
| $458K | ﹤0.01% |
+15,300
| New | +$393K |
|
3789
CALL
Universal Health Services
UHS
$9.74B
| $457K | ﹤0.01% |
3,000
-6,200
| -67% | -$834K |
|
|
UNIT
3790
PUT
Uniti Group
UNIT
$2.59B
| $456K | ﹤0.01% |
123,800
+45,400
| +58% | +$230K |
|
3791
CALL
Westamerica Bancorp
WABC
$1.4B
| $456K | ﹤0.01% |
+8,100
| New | +$401K |
|
3792
Assured Guaranty
AGO
$3.76B
| $455K | ﹤0.01% |
6,082
+5,344
| +724% | +$353K |
|
3793
PUT
Nokia
NOK
$49.6B
| $455K | ﹤0.01% |
133,200
-42,100
| -24% | -$143K |
|
|
PMT
3794
PUT
PennyMac Mortgage Investment
PMT
$860M
| $455K | ﹤0.01% |
30,500
+25,400
| +498% | +$341K |
|
3795
PUT
Talos Energy
TALO
$2.29B
| $455K | ﹤0.01% |
32,000
+2,800
| +10% | +$40.9K |
|
|
PDCO
3796
PUT
DELISTED
Patterson Companies, Inc.
PDCO
| $455K | ﹤0.01% |
16,000
+12,300
| +332% | +$362K |
|
|
AVDX
3797
CALL
DELISTED
AvidXchange
AVDX
| $453K | ﹤0.01% |
36,600
+22,100
| +152% | +$221K |
|
3798
PUT
Boise Cascade
BCC
$2.86B
| $452K | ﹤0.01% |
3,500
+1,200
| +52% | +$129K |
|
3799
Otis Worldwide
OTIS
$28.3B
| $452K | ﹤0.01% |
5,059
+1,709
| +51% | +$142K |
|
3800
CALL
Reinsurance Group of America
RGA
$15.9B
| $452K | ﹤0.01% |
2,800
-1,300
| -32% | -$202K |
|
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.