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 | |
|---|---|---|---|---|---|---|
3601
Crane NXT
CXT
$3.12B
| $547K | ﹤0.01% |
9,636
+8,098
| +527% | +$430K |
|
3602
PUT
Amplify Online Retail ETF
IBUY
$110M
| $547K | ﹤0.01% |
18,300
-25,600
| -58% | -$1.2M |
|
3603
CALL
Vivid Seats
SEAT
$84.8M
| $547K | ﹤0.01% |
4,335
+1,590
| +58% | +$218K |
|
3604
PUT
Arcturus Therapeutics
ARCT
$164M
| $545K | ﹤0.01% |
17,300
+14,100
| +441% | +$335K |
|
|
IPG
3605
CALL
DELISTED
Interpublic Group of Companies
IPG
| $545K | ﹤0.01% |
16,700
-26,400
| -61% | -$795K |
|
|
BLUE
3606
PUT
DELISTED
bluebird bio
BLUE
| $544K | ﹤0.01% |
19,745
+10,945
| +124% | +$667K |
|
3607
PUT
MBIA
MBI
$282M
| $544K | ﹤0.01% |
88,900
+30,400
| +52% | +$244K |
|
3608
CALL
Gentherm
THRM
$1.29B
| $544K | ﹤0.01% |
10,400
-34,100
| -77% | -$1.67M |
|
3609
PUT
Canadian Imperial Bank of Commerce
CM
$108B
| $543K | ﹤0.01% |
11,300
-2,700
| -19% | -$108K |
|
3610
abrdn Physical Gold Shares ETF
SGOL
$6.97B
| $543K | ﹤0.01% |
27,536
+24,217
| +730% | +$458K |
|
3611
SIGA Technologies
SIGA
$222M
| $543K | ﹤0.01% |
96,995
-33,299
| -26% | -$178K |
|
3612
CALL
Teucrium Agricultural Fund
TAGS
$19.2M
| $543K | ﹤0.01% |
44,900
-56,800
| -56% | -$1.74M |
|
3613
CALL
Freshworks
FRSH
$2.99B
| $542K | ﹤0.01% |
23,100
-6,500
| -22% | -$129K |
|
|
BRSL
3614
Brightstar Lottery PLC
BRSL
$1.93B
| $542K | ﹤0.01% |
+19,774
| New | +$554K |
|
3615
CALL
Kirby Corp
KEX
$7.76B
| $541K | ﹤0.01% |
6,900
+6,300
| +1,050% | +$493K |
|
|
ICVX
3616
PUT
DELISTED
Icosavax, Inc. Common Stock
ICVX
| $540K | ﹤0.01% |
34,300
+32,900
| +2,350% | +$317K |
|
|
SWN
3617
PUT
DELISTED
Southwestern Energy Company
SWN
| $539K | ﹤0.01% |
82,300
-13,300
| -14% | -$88.8K |
|
3618
CALL
Adient
ADNT
$1.62B
| $538K | ﹤0.01% |
14,800
+14,200
| +2,367% | +$487K |
|
3619
Invesco KBW Bank ETF
KBWB
$6.88B
| $538K | ﹤0.01% |
+10,941
| New | +$463K |
|
3620
PUT
Xylem
XYL
$28.6B
| $537K | ﹤0.01% |
4,700
+300
| +7% | +$29.9K |
|
3621
C4 Therapeutics
CCCC
$397M
| $536K | ﹤0.01% |
+95,020
| New | +$217K |
|
3622
PUT
International Seaways
INSW
$4.49B
| $536K | ﹤0.01% |
11,800
-26,100
| -69% | -$1.2M |
|
3623
MakeMyTrip
MMYT
$4.97B
| $536K | ﹤0.01% |
11,428
+5,582
| +95% | +$235K |
|
|
SNBR
3624
PUT
DELISTED
Sleep Number
SNBR
| $536K | ﹤0.01% |
36,200
+13,500
| +59% | +$210K |
|
3625
PUT
Globalstar
GSAT
$10.2B
| $535K | ﹤0.01% |
18,387
+4,680
| +34% | +$103K |
|
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.