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 | |
|---|---|---|---|---|---|---|
1876
CALL
Novavax
NVAX
$1.23B
| $3.45M | ﹤0.01% |
718,000
-475,200
| -40% | -$2.91M |
|
|
CNH
1877
CALL
CNH Industrial
CNH
$13.8B
| $3.44M | ﹤0.01% |
282,700
+210,900
| +294% | +$2.35M |
|
1878
ProShares UltraShort Bloomberg Natural Gas
KOLD
$110M
| $3.44M | ﹤0.01% |
71,392
+55,780
| +357% | +$1.95M |
|
1879
Stanley Black & Decker
SWK
$14.2B
| $3.44M | ﹤0.01% |
35,039
+19,427
| +124% | +$1.71M |
|
1880
Lightspeed Commerce
LSPD
$1.3B
| $3.43M | ﹤0.01% |
163,598
+114,628
| +234% | +$1.81M |
|
1881
PUT
LKQ Corp
LKQ
$6.58B
| $3.43M | ﹤0.01% |
71,700
+69,300
| +2,888% | +$3.23M |
|
1882
United Rentals
URI
$71.1B
| $3.42M | ﹤0.01% |
5,973
-3,175
| -35% | -$1.5M |
|
1883
PUT
Infosys
INFY
$45B
| $3.42M | ﹤0.01% |
186,200
+43,800
| +31% | +$762K |
|
1884
PUT
Wyndham Hotels & Resorts
WH
$5.46B
| $3.42M | ﹤0.01% |
42,500
+14,800
| +53% | +$1.11M |
|
1885
CALL
Plains GP Holdings
PAGP
$5.23B
| $3.41M | ﹤0.01% |
213,900
-10,200
| -5% | -$161K |
|
1886
PUT
Hertz
HTZ
$572M
| $3.41M | ﹤0.01% |
327,900
-71,600
| -18% | -$691K |
|
1887
East-West Bancorp
EWBC
$17.9B
| $3.4M | ﹤0.01% |
+47,314
| New | +$2.85M |
|
1888
PUT
Textron
TXT
$16.6B
| $3.4M | ﹤0.01% |
42,300
+10,000
| +31% | +$775K |
|
1889
PUT
Pacific Biosciences
PACB
$422M
| $3.4M | ﹤0.01% |
346,100
-93,000
| -21% | -$761K |
|
1890
Vanguard Dividend Appreciation ETF
VIG
$111B
| $3.39M | ﹤0.01% |
19,906
+17,324
| +671% | +$2.79M |
|
1891
PUT
FuboTV Inc
FUBO
$245M
| $3.39M | ﹤0.01% |
88,842
+24,867
| +39% | +$861K |
|
1892
Vanguard Information Technology ETF
VGT
$139B
| $3.39M | ﹤0.01% |
55,976
+13,288
| +31% | +$740K |
|
1893
Vanguard Mid-Cap ETF
VO
$106B
| $3.38M | ﹤0.01% |
58,192
+55,792
| +2,325% | +$2.98M |
|
1894
CALL
Prothena Corp
PRTA
$458M
| $3.38M | ﹤0.01% |
93,100
+89,100
| +2,228% | +$3.43M |
|
1895
CALL
Concentrix
CNXC
$1.36B
| $3.38M | ﹤0.01% |
34,400
+31,800
| +1,223% | +$2.77M |
|
1896
PUT
TKO Group
TKO
$13.5B
| $3.38M | ﹤0.01% |
41,400
-33,800
| -45% | -$2.68M |
|
1897
ProShares Ultra VIX Short-Term Futures ETF
UVXY
$249M
| $3.37M | ﹤0.01% |
+15,987
| New | +$5.15M |
|
1898
CALL
Xerox
XRX
$337M
| $3.36M | ﹤0.01% |
183,100
+79,800
| +77% | +$1.18M |
|
1899
Cisco
CSCO
$450B
| $3.35M | ﹤0.01% |
+66,342
| New | +$3.39M |
|
1900
CALL
Natera
NTRA
$37.5B
| $3.34M | ﹤0.01% |
53,300
+42,800
| +408% | +$2.14M |
|
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.