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 | |
|---|---|---|---|---|---|---|
1926
CALL
Bank OZK
OZK
$5.49B
| $3.25M | ﹤0.01% |
65,300
-35,300
| -35% | -$1.45M |
|
1927
CALL
AerCap
AER
$23.9B
| $3.25M | ﹤0.01% |
43,700
+12,300
| +39% | +$812K |
|
1928
CALL
Telephone and Data Systems
TDS
$3.91B
| $3.23M | ﹤0.01% |
176,200
-17,900
| -9% | -$330K |
|
1929
PUT
Caleres
CAL
$396M
| $3.23M | ﹤0.01% |
105,200
-2,800
| -3% | -$79K |
|
1930
PUT
Cenovus Energy
CVE
$54.6B
| $3.23M | ﹤0.01% |
194,100
+60,500
| +45% | +$1.11M |
|
|
TEN
1931
CALL
Tsakos Energy Navigation Ltd
TEN
$1.19B
| $3.23M | ﹤0.01% |
145,400
+15,700
| +12% | +$334K |
|
1932
PUT
Welltower
WELL
$178B
| $3.23M | ﹤0.01% |
35,800
+20,400
| +132% | +$1.77M |
|
1933
CALL
Henry Schein
HSIC
$9.74B
| $3.23M | ﹤0.01% |
42,600
+28,600
| +204% | +$2M |
|
1934
CALL
HEICO Corp Class A
HEI.A
$35.4B
| $3.22M | ﹤0.01% |
18,000
+3,500
| +24% | +$474K |
|
1935
CALL
Lumentum
LITE
$59.4B
| $3.22M | ﹤0.01% |
61,400
-23,600
| -28% | -$1.03M |
|
1936
PUT
Pentair
PNR
$10.2B
| $3.21M | ﹤0.01% |
44,200
+41,800
| +1,742% | +$2.7M |
|
1937
CALL
PTC Therapeutics
PTCT
$6.37B
| $3.21M | ﹤0.01% |
116,600
+84,900
| +268% | +$1.94M |
|
1938
Goodyear
GT
$2.07B
| $3.21M | ﹤0.01% |
224,157
+1,159
| +0.5% | +$15.4K |
|
1939
Pacific Biosciences
PACB
$422M
| $3.21M | ﹤0.01% |
326,791
+84,556
| +35% | +$692K |
|
1940
PUT
Syndax Pharmaceuticals
SNDX
$1.84B
| $3.2M | ﹤0.01% |
148,200
+36,900
| +33% | +$567K |
|
1941
CALL
Colliers International
CIGI
$4.98B
| $3.2M | ﹤0.01% |
25,300
+19,700
| +352% | +$2.02M |
|
1942
CALL
Paylocity
PCTY
$6.71B
| $3.2M | ﹤0.01% |
19,400
+17,400
| +870% | +$2.93M |
|
1943
CALL
Joby Aviation
JOBY
$6.82B
| $3.19M | ﹤0.01% |
479,300
-61,400
| -11% | -$378K |
|
1944
CALL
Aurinia Pharmaceuticals
AUPH
$1.97B
| $3.18M | ﹤0.01% |
353,500
+94,300
| +36% | +$777K |
|
|
SAVE
1945
PUT
DELISTED
Spirit Airlines, Inc.
SAVE
| $3.17M | ﹤0.01% |
193,700
+94,200
| +95% | +$1.36M |
|
1946
CALL
Public Storage
PSA
$60.2B
| $3.17M | ﹤0.01% |
10,400
-18,200
| -64% | -$4.83M |
|
1947
PUT
Northern Oil and Gas
NOG
$2.3B
| $3.17M | ﹤0.01% |
85,500
+48,500
| +131% | +$1.83M |
|
1948
CALL
10x Genomics
TXG
$5.87B
| $3.17M | ﹤0.01% |
56,600
-148,500
| -72% | -$6.46M |
|
|
HRT
1949
PUT
DELISTED
HireRight Holdings Corporation
HRT
| $3.17M | ﹤0.01% |
+235,500
| New | +$2.66M |
|
1950
PUT
EyePoint Inc
EYPT
$1.02B
| $3.16M | ﹤0.01% |
136,900
+123,700
| +937% | +$1.38M |
|
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.