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 | |
|---|---|---|---|---|---|---|
5026
CALL
Protalix BioTherapeutics
PLX
$183M
| $142K | ﹤0.01% |
80,200
+15,200
| +23% | +$23.6K |
|
5027
Star Bulk Carriers
SBLK
$3.25B
| $142K | ﹤0.01% |
6,709
-44,675
| -87% | -$881K |
|
5028
Vanguard Mortgage-Backed Securities ETF
VMBS
$15.5B
| $142K | ﹤0.01% |
3,072
-1,922
| -38% | -$85K |
|
|
CUTR
5029
CALL
DELISTED
Cutera, Inc.
CUTR
| $142K | ﹤0.01% |
40,300
+32,100
| +391% | +$97.8K |
|
5030
ProShares Ultra NASDAQ Biotechnology
BIB
$84.3M
| $141K | ﹤0.01% |
2,479
+2,434
| +5,409% | +$114K |
|
5031
PUT
Bausch + Lomb
BLCO
$6.06B
| $141K | ﹤0.01% |
8,300
+3,100
| +60% | +$49.9K |
|
5032
PUT
Beazer Homes USA
BZH
$891M
| $141K | ﹤0.01% |
4,200
-2,000
| -32% | -$54.7K |
|
5033
PUT
JFrog
FROG
$9.5B
| $141K | ﹤0.01% |
4,100
-8,100
| -66% | -$219K |
|
5034
PUT
Upland Software
UPLD
$13.6M
| $141K | ﹤0.01% |
3,350
+3,260
| +3,622% | +$141K |
|
5035
PUT
Clearwater Paper
CLW
$341M
| $140K | ﹤0.01% |
3,900
+3,600
| +1,200% | +$129K |
|
5036
Cavco Industries
CVCO
$4.33B
| $140K | ﹤0.01% |
+406
| New | +$116K |
|
5037
Liberty Live Group Series A
LLYVA
$9.39B
| $140K | ﹤0.01% |
+3,838
| New | +$127K |
|
5038
Seanergy Maritime Holdings
SHIP
$386M
| $140K | ﹤0.01% |
17,957
-8,401
| -32% | -$52.4K |
|
|
DO
5039
PUT
DELISTED
Diamond Offshore Drilling, Inc.
DO
| $140K | ﹤0.01% |
10,800
-3,000
| -22% | -$38.8K |
|
5040
Booz Allen Hamilton
BAH
$8.22B
| $139K | ﹤0.01% |
1,093
+572
| +110% | +$71.3K |
|
5041
PUT
CMS Energy
CMS
$22.7B
| $139K | ﹤0.01% |
+2,400
| New | +$134K |
|
5042
First Trust Natural Gas ETF
FCG
$635M
| $139K | ﹤0.01% |
+5,760
| New | +$145K |
|
5043
IPG Photonics
IPGP
$3.6B
| $139K | ﹤0.01% |
1,281
+279
| +28% | +$27K |
|
5044
PUT
Lazard
LAZ
$4.09B
| $139K | ﹤0.01% |
4,000
+3,500
| +700% | +$105K |
|
5045
CALL
MidCap Financial Investment
MFIC
$796M
| $139K | ﹤0.01% |
10,200
-14,700
| -59% | -$196K |
|
5046
CALL
Omeros
OMER
$863M
| $139K | ﹤0.01% |
42,700
+9,600
| +29% | +$20.3K |
|
5047
CALL
Sinclair Inc
SBGI
$994M
| $139K | ﹤0.01% |
10,700
-7,000
| -40% | -$85.9K |
|
5048
CALL
TORM
TRMD
$3.1B
| $139K | ﹤0.01% |
4,600
-2,300
| -33% | -$67.8K |
|
5049
CALL
Vera Bradley
VRA
$99.2M
| $139K | ﹤0.01% |
18,100
-96,300
| -84% | -$701K |
|
5050
Global X S&P 500 Covered Call ETF
XYLD
$3.22B
| $139K | ﹤0.01% |
+3,534
| New | +$138K |
|
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.