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 | |
|---|---|---|---|---|---|---|
3851
PUT
Antero Midstream
AM
$10.3B
| $432K | ﹤0.01% |
34,500
+3,800
| +12% | +$47.9K |
|
3852
Blink Charging
BLNK
$74.1M
| $432K | ﹤0.01% |
+127,662
| New | +$399K |
|
3853
PUT
MakeMyTrip
MMYT
$5.1B
| $432K | ﹤0.01% |
9,200
+100
| +1% | +$4.21K |
|
3854
Invesco S&P 500 High Beta ETF
SPHB
$965M
| $432K | ﹤0.01% |
+5,254
| New | +$379K |
|
3855
Cogent Communications
CCOI
$649M
| $431K | ﹤0.01% |
5,679
+3,842
| +209% | +$257K |
|
3856
PUT
Kirby Corp
KEX
$7.77B
| $431K | ﹤0.01% |
+5,500
| New | +$430K |
|
3857
Global X Lithium & Battery Tech ETF
LIT
$1.46B
| $431K | ﹤0.01% |
+8,478
| New | +$420K |
|
3858
CALL
Phillips Edison & Co
PECO
$5.37B
| $430K | ﹤0.01% |
11,800
+8,400
| +247% | +$294K |
|
|
JMIA
3859
Jumia Technologies
JMIA
$741M
| $429K | ﹤0.01% |
121,780
-79,839
| -40% | -$240K |
|
3860
PUT
iRhythm Holdings
IRTC
$3.86B
| $428K | ﹤0.01% |
4,000
+600
| +18% | +$52.3K |
|
3861
Leggett & Platt
LEG
$1.47B
| $427K | ﹤0.01% |
16,347
-9,822
| -38% | -$241K |
|
3862
PUT
PetMed Express
PETS
$43M
| $427K | ﹤0.01% |
56,500
+50,400
| +826% | +$414K |
|
3863
CALL
Travere Therapeutics
TVTX
$5.2B
| $427K | ﹤0.01% |
47,600
-22,100
| -32% | -$161K |
|
3864
D.R. Horton
DHI
$42.3B
| $426K | ﹤0.01% |
+2,809
| New | +$346K |
|
3865
Loews
L
$24.6B
| $426K | ﹤0.01% |
6,131
+3,209
| +110% | +$213K |
|
3866
CALL
Designer Brands
DBI
$322M
| $425K | ﹤0.01% |
48,100
-47,000
| -49% | -$495K |
|
3867
CALL
Genworth Financial
GNW
$3.85B
| $425K | ﹤0.01% |
63,700
-71,000
| -53% | -$431K |
|
3868
CALL
Markel Group
MKL
$25.5B
| $425K | ﹤0.01% |
300
-100
| -25% | -$142K |
|
3869
CALL
NeoGenomics
NEO
$1.74B
| $425K | ﹤0.01% |
26,300
-24,600
| -48% | -$403K |
|
3870
PUT
Cirrus Logic
CRUS
$6.87B
| $424K | ﹤0.01% |
5,100
-2,900
| -36% | -$217K |
|
3871
PUT
Editas Medicine
EDIT
$402M
| $424K | ﹤0.01% |
41,900
+12,400
| +42% | +$109K |
|
3872
CALL
Global Net Lease
GNL
$1.86B
| $424K | ﹤0.01% |
42,700
+11,200
| +36% | +$97.9K |
|
3873
Factset
FDS
$10.1B
| $423K | ﹤0.01% |
+888
| New | +$400K |
|
3874
Nabors Industries
NBR
$1.12B
| $423K | ﹤0.01% |
5,183
-2,857
| -36% | -$277K |
|
3875
iShares National Muni Bond ETF
MUB
$45.3B
| $422K | ﹤0.01% |
3,897
+1,116
| +40% | +$117K |
|
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.