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 | |
|---|---|---|---|---|---|---|
|
ETRN
1776
DELISTED
Equitrans Midstream Corporation Common Stock
ETRN
| $3.88M | ﹤0.01% |
380,883
+109,733
| +40% | +$1.03M |
|
1777
PUT
Boston Beer
SAM
$1.88B
| $3.87M | ﹤0.01% |
11,200
+3,400
| +44% | +$1.19M |
|
1778
CALL
Pool Corp
POOL
$6.7B
| $3.87M | ﹤0.01% |
9,700
-92,500
| -91% | -$32.4M |
|
1779
CALL
Axos Financial
AX
$5.45B
| $3.87M | ﹤0.01% |
70,800
+66,100
| +1,406% | +$2.76M |
|
1780
CALL
MarketAxess Holdings
MKTX
$4.15B
| $3.87M | ﹤0.01% |
13,200
-15,400
| -54% | -$3.72M |
|
1781
PUT
SBA Communications
SBAC
$18.4B
| $3.86M | ﹤0.01% |
15,200
-10,600
| -41% | -$2.38M |
|
1782
PUT
Genuine Parts
GPC
$17.1B
| $3.85M | ﹤0.01% |
27,800
+24,100
| +651% | +$3.31M |
|
1783
PUT
Kilroy Realty
KRC
$4.58B
| $3.85M | ﹤0.01% |
96,600
+95,700
| +10,633% | +$3.16M |
|
|
RDFN
1784
PUT
DELISTED
Redfin
RDFN
| $3.85M | ﹤0.01% |
372,600
+63,000
| +20% | +$439K |
|
1785
PUT
TORM
TRMD
$3.1B
| $3.84M | ﹤0.01% |
126,300
+116,500
| +1,189% | +$3.44M |
|
1786
CALL
Liberty Broadband Class C
LBRDK
$4.15B
| $3.83M | ﹤0.01% |
47,500
+47,400
| +47,400% | +$3.98M |
|
1787
CALL
Newell Brands
NWL
$2.16B
| $3.83M | ﹤0.01% |
440,800
-46,900
| -10% | -$358K |
|
|
GOOS
1788
CALL
Canada Goose Holdings
GOOS
$868M
| $3.82M | ﹤0.01% |
322,400
+237,200
| +278% | +$2.81M |
|
1789
PUT
Knight Transportation
KNX
$11.8B
| $3.82M | ﹤0.01% |
66,200
+57,700
| +679% | +$3.02M |
|
1790
PUT
TripAdvisor
TRIP
$1.59B
| $3.81M | ﹤0.01% |
176,900
+19,900
| +13% | +$349K |
|
|
ANSS
1791
DELISTED
Ansys
ANSS
| $3.8M | ﹤0.01% |
+10,481
| New | +$3.1M |
|
1792
CALL
FTAI Aviation
FTAI
$22.2B
| $3.79M | ﹤0.01% |
81,800
+57,800
| +241% | +$2.31M |
|
1793
FIVE9
FIVN
$1.77B
| $3.79M | ﹤0.01% |
+48,211
| New | +$3.36M |
|
1794
PUT
Nexstar Media Group
NXST
$5.6B
| $3.79M | ﹤0.01% |
24,200
+3,300
| +16% | +$483K |
|
1795
CALL
Oxford Industries
OXM
$577M
| $3.79M | ﹤0.01% |
37,900
+33,900
| +848% | +$3.15M |
|
1796
CALL
SPS Commerce
SPSC
$2.25B
| $3.78M | ﹤0.01% |
+19,500
| New | +$3.4M |
|
1797
PUT
Valley National Bancorp
VLY
$7.93B
| $3.78M | ﹤0.01% |
347,700
+6,900
| +2% | +$61.9K |
|
1798
PUT
St. Joe Company
JOE
$3.57B
| $3.77M | ﹤0.01% |
62,700
+61,300
| +4,379% | +$3.23M |
|
1799
PUT
Clean Harbors
CLH
$16.1B
| $3.77M | ﹤0.01% |
21,600
+21,000
| +3,500% | +$3.45M |
|
1800
CALL
Quest Diagnostics
DGX
$25.1B
| $3.76M | ﹤0.01% |
27,300
-60,100
| -69% | -$7.9M |
|
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.