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 | |
|---|---|---|---|---|---|---|
3951
WD-40
WDFC
$3.08B
| $393K | ﹤0.01% |
1,644
-2,960
| -64% | -$661K |
|
3952
Banco Bradesco
BBD
$38.3B
| $392K | ﹤0.01% |
+112,211
| New | +$352K |
|
3953
Columbia Banking Systems
COLB
$8.84B
| $392K | ﹤0.01% |
14,695
+13,206
| +887% | +$294K |
|
3954
PUT
Apple Hospitality REIT
APLE
$3.97B
| $391K | ﹤0.01% |
23,600
+11,300
| +92% | +$183K |
|
|
CYBR
3955
DELISTED
CyberArk
CYBR
| $391K | ﹤0.01% |
+1,786
| New | +$331K |
|
3956
Sun Communities
SUI
$15.3B
| $391K | ﹤0.01% |
+2,927
| New | +$353K |
|
3957
AvePoint
AVPT
$2.74B
| $390K | ﹤0.01% |
+47,537
| New | +$371K |
|
3958
CALL
Oshkosh
OSK
$9.51B
| $390K | ﹤0.01% |
3,600
-2,000
| -36% | -$193K |
|
3959
PUT
Anavex Life Sciences
AVXL
$238M
| $388K | ﹤0.01% |
41,700
-3,700
| -8% | -$25.5K |
|
3960
PUT
The RealReal
REAL
$1.44B
| $388K | ﹤0.01% |
193,200
-142,400
| -42% | -$277K |
|
3961
PUT
United Natural Foods
UNFI
$3.07B
| $387K | ﹤0.01% |
23,900
-1,100
| -4% | -$16.7K |
|
3962
CALL
WEC Energy
WEC
$37B
| $387K | ﹤0.01% |
4,600
-6,100
| -57% | -$502K |
|
3963
PUT
AMC Global Media
AMCX
$451M
| $385K | ﹤0.01% |
20,500
+3,800
| +23% | +$56.3K |
|
3964
Qiagen
QGEN
$8.72B
| $385K | ﹤0.01% |
+8,372
| New | +$356K |
|
3965
PUT
AbCellera Biologics
ABCL
$1.62B
| $384K | ﹤0.01% |
67,300
+34,700
| +106% | +$161K |
|
|
HIMX
3966
Himax Technologies
HIMX
$2.09B
| $384K | ﹤0.01% |
63,316
+4,097
| +7% | +$23.7K |
|
3967
PUT
Argan
AGX
$7.33B
| $383K | ﹤0.01% |
+8,200
| New | +$374K |
|
3968
CALL
Tetra Tech
TTEK
$8.7B
| $383K | ﹤0.01% |
11,500
+2,000
| +21% | +$63.9K |
|
3969
PUT
Carlyle Group
CG
$16.7B
| $382K | ﹤0.01% |
9,400
+4,100
| +77% | +$135K |
|
3970
HighPeak Energy
HPK
$811M
| $382K | ﹤0.01% |
26,892
-15,526
| -37% | -$246K |
|
3971
NETGEAR
NTGR
$663M
| $382K | ﹤0.01% |
26,221
-6,458
| -20% | -$83.6K |
|
3972
CALL
United States Gasoline Fund
UGA
$142M
| $382K | ﹤0.01% |
6,300
-900
| -13% | -$56.3K |
|
|
AY
3973
PUT
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $382K | ﹤0.01% |
17,800
-1,000
| -5% | -$19K |
|
3974
Allegion
ALLE
$13.7B
| $381K | ﹤0.01% |
3,015
+2,540
| +535% | +$271K |
|
3975
PUT
Factset
FDS
$10.1B
| $381K | ﹤0.01% |
800
-8,800
| -92% | -$3.96M |
|
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.