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 | |
|---|---|---|---|---|---|---|
2876
PUT
Modine Manufacturing
MOD
$12.8B
| $1.16M | ﹤0.01% |
19,400
+7,400
| +62% | +$362K |
|
2877
Arvinas
ARVN
$518M
| $1.16M | ﹤0.01% |
28,070
-1,636
| -6% | -$38.2K |
|
2878
Rithm Capital
RITM
$5.09B
| $1.15M | ﹤0.01% |
+108,105
| New | +$1.08M |
|
2879
CALL
Bread Financial
BFH
$4.21B
| $1.15M | ﹤0.01% |
35,000
+12,800
| +58% | +$382K |
|
2880
Buckle
BKE
$2.19B
| $1.15M | ﹤0.01% |
24,263
+17,260
| +246% | +$653K |
|
|
BCYC
2881
PUT
Bicycle Therapeutics
BCYC
$270M
| $1.15M | ﹤0.01% |
63,700
-3,700
| -5% | -$61.2K |
|
|
ZIMV
2882
DELISTED
ZimVie
ZIMV
| $1.15M | ﹤0.01% |
+64,887
| New | +$654K |
|
2883
CALL
Flowserve
FLS
$9.25B
| $1.15M | ﹤0.01% |
27,900
-4,100
| -13% | -$158K |
|
2884
CALL
Insmed
INSM
$23.2B
| $1.15M | ﹤0.01% |
37,100
+24,500
| +194% | +$635K |
|
2885
PUT
Equitable Holdings
EQH
$13.1B
| $1.15M | ﹤0.01% |
34,500
-11,600
| -25% | -$340K |
|
|
AZUL
2886
DELISTED
Azul
AZUL
| $1.15M | ﹤0.01% |
118,414
+93,769
| +380% | +$853K |
|
2887
PUT
McEwen Inc
MUX
$1.03B
| $1.15M | ﹤0.01% |
161,200
+151,700
| +1,597% | +$1.1M |
|
2888
PUT
Nano X Imaging
NNOX
$62.4M
| $1.15M | ﹤0.01% |
180,200
-75,600
| -30% | -$472K |
|
|
ENLC
2889
CALL
DELISTED
ENLINK MIDSTREAM, LLC
ENLC
| $1.15M | ﹤0.01% |
94,400
+3,300
| +4% | +$41.4K |
|
2890
CALL
CenterPoint Energy
CNP
$29.1B
| $1.15M | ﹤0.01% |
40,100
+22,400
| +127% | +$623K |
|
2891
Public Storage
PSA
$60.2B
| $1.15M | ﹤0.01% |
+3,756
| New | +$997K |
|
2892
PUT
Sturm, Ruger & Co
RGR
$610M
| $1.15M | ﹤0.01% |
25,200
+23,400
| +1,300% | +$1.12M |
|
2893
Dave & Buster's
PLAY
$343M
| $1.14M | ﹤0.01% |
+21,262
| New | +$860K |
|
2894
CALL
MACOM Technology Solutions
MTSI
$20.4B
| $1.14M | ﹤0.01% |
12,300
+11,600
| +1,657% | +$954K |
|
|
EGLE
2895
PUT
DELISTED
Eagle Bulk Shipping Inc.
EGLE
| $1.14M | ﹤0.01% |
20,600
-7,100
| -26% | -$321K |
|
2896
PUT
Celestica
CLS
$35.1B
| $1.14M | ﹤0.01% |
38,900
+22,900
| +143% | +$609K |
|
|
ETNB
2897
PUT
DELISTED
89bio
ETNB
| $1.14M | ﹤0.01% |
101,700
+50,200
| +97% | +$461K |
|
2898
St. Joe Company
JOE
$3.57B
| $1.13M | ﹤0.01% |
+18,859
| New | +$992K |
|
2899
Lemonade
LMND
$4.62B
| $1.13M | ﹤0.01% |
70,332
+68,151
| +3,125% | +$1.03M |
|
2900
PUT
Gold Fields
GFI
$29.2B
| $1.13M | ﹤0.01% |
78,400
+46,200
| +143% | +$639K |
|
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.