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 | |
|---|---|---|---|---|---|---|
3676
Charles River Laboratories
CRL
$10.8B
| $511K | ﹤0.01% |
+2,162
| New | +$425K |
|
|
VRN
3677
CALL
DELISTED
Veren
VRN
| $511K | ﹤0.01% |
73,800
+8,200
| +13% | +$60.5K |
|
|
SBOW
3678
CALL
DELISTED
SilverBow Resources, Inc.
SBOW
| $511K | ﹤0.01% |
17,600
+4,700
| +36% | +$151K |
|
3679
PUT
M/I Homes
MHO
$3.81B
| $509K | ﹤0.01% |
3,700
+500
| +16% | +$50K |
|
3680
CALL
Xometry
XMTR
$4.75B
| $509K | ﹤0.01% |
14,200
-4,000
| -22% | -$85.8K |
|
3681
Carlisle Companies
CSL
$13.8B
| $508K | ﹤0.01% |
+1,628
| New | +$448K |
|
3682
iShares Core US Aggregate Bond ETF
AGG
$138B
| $507K | ﹤0.01% |
5,116
+2,341
| +84% | +$223K |
|
3683
PUT
Banco Macro
BMA
$5.89B
| $507K | ﹤0.01% |
17,700
+12,300
| +228% | +$281K |
|
3684
PUT
Lifestance Health
LFST
$4.15B
| $507K | ﹤0.01% |
64,800
+14,300
| +28% | +$92.2K |
|
3685
CALL
Ormat Technologies
ORA
$6.28B
| $507K | ﹤0.01% |
6,700
+5,100
| +319% | +$346K |
|
3686
CALL
Q2 Holdings
QTWO
$3.64B
| $507K | ﹤0.01% |
11,700
+1,000
| +9% | +$35.5K |
|
3687
CALL
AerSale
ASLE
$307M
| $506K | ﹤0.01% |
39,900
+33,500
| +523% | +$486K |
|
3688
CALL
Dycom Industries
DY
$12.7B
| $506K | ﹤0.01% |
4,400
-35,400
| -89% | -$3.36M |
|
3689
CALL
Arcus Biosciences
RCUS
$3.5B
| $506K | ﹤0.01% |
26,500
-33,200
| -56% | -$531K |
|
3690
TORM
TRMD
$3.05B
| $506K | ﹤0.01% |
16,640
+4,410
| +36% | +$130K |
|
|
RVNC
3691
PUT
DELISTED
Revance Therapeutics, Inc.
RVNC
| $506K | ﹤0.01% |
57,600
+15,600
| +37% | +$128K |
|
|
BASE
3692
DELISTED
Couchbase
BASE
| $505K | ﹤0.01% |
+22,431
| New | +$411K |
|
3693
CALL
BigBear.ai
BBAI
$1.36B
| $504K | ﹤0.01% |
235,600
+34,200
| +17% | +$55.3K |
|
3694
CALL
Howard Hughes
HHH
$3.93B
| $504K | ﹤0.01% |
6,189
-2,098
| -25% | -$147K |
|
3695
PUT
Maravai LifeSciences
MRVI
$987M
| $504K | ﹤0.01% |
77,000
+72,100
| +1,471% | +$466K |
|
3696
PUT
POSCO
PKX
$16.1B
| $504K | ﹤0.01% |
5,300
| – | – |
|
3697
PUT
Kanzhun
BZ
$7.03B
| $503K | ﹤0.01% |
30,300
-56,300
| -65% | -$884K |
|
3698
Invesco Mortgage Capital
IVR
$762M
| $503K | ﹤0.01% |
56,828
+40,624
| +251% | +$331K |
|
3699
Structure Therapeutics
GPCR
$3.46B
| $502K | ﹤0.01% |
+12,322
| New | +$706K |
|
|
HOUS
3700
DELISTED
Anywhere Real Estate
HOUS
| $502K | ﹤0.01% |
+61,976
| New | +$351K |
|
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.