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 | |
|---|---|---|---|---|---|---|
1226
Vanguard Small-Cap Growth ETF
VBK
$23.4B
| $8.19M | 0.01% |
33,881
+33,844
| +91,470% | +$7.35M |
|
1227
CALL
Symbotic
SYM
$5.16B
| $8.18M | 0.01% |
159,300
+108,000
| +211% | +$4.73M |
|
|
SWAV
1228
PUT
DELISTED
Shockwave Medical, Inc. Common Stock
SWAV
| $8.18M | 0.01% |
42,900
+18,000
| +72% | +$3.4M |
|
1229
PUT
Yelp
YELP
$1.35B
| $8.15M | 0.01% |
172,200
+150,600
| +697% | +$6.65M |
|
1230
CALL
Corteva
CTVA
$59.4B
| $8.14M | 0.01% |
169,900
+139,000
| +450% | +$6.63M |
|
|
NOVA
1231
CALL
DELISTED
Sunnova Energy
NOVA
| $8.13M | 0.01% |
533,300
+304,500
| +133% | +$3.33M |
|
|
SHNY
1232
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $8.1M | 0.01% |
525,900
+165,800
| +46% | +$2.55M |
|
|
CYBR
1233
PUT
DELISTED
CyberArk
CYBR
| $8.08M | 0.01% |
36,900
+9,700
| +36% | +$1.8M |
|
1234
PUT
Toast
TOST
$16.5B
| $8.07M | 0.01% |
442,000
+257,100
| +139% | +$4.22M |
|
1235
CALL
Cognizant
CTSH
$20.3B
| $8.05M | 0.01% |
106,600
+20,400
| +24% | +$1.41M |
|
|
ANSS
1236
CALL
DELISTED
Ansys
ANSS
| $8.02M | 0.01% |
22,100
+9,600
| +77% | +$2.84M |
|
1237
CALL
American Water Works
AWK
$26.2B
| $8.01M | 0.01% |
60,700
+49,000
| +419% | +$6.18M |
|
1238
BP
BP
$113B
| $8.01M | 0.01% |
226,137
+10,430
| +5% | +$382K |
|
|
FYBR
1239
CALL
DELISTED
Frontier Communications
FYBR
| $8M | 0.01% |
315,700
+112,400
| +55% | +$2.27M |
|
1240
CALL
Royal Gold
RGLD
$16.9B
| $8M | 0.01% |
66,100
-2,600
| -4% | -$294K |
|
|
GTM
1241
CALL
ZoomInfo Technologies
GTM
$849M
| $7.98M | 0.01% |
431,600
+103,900
| +32% | +$1.63M |
|
1242
CALL
Lemonade
LMND
$4.66B
| $7.97M | 0.01% |
494,200
+370,100
| +298% | +$5.58M |
|
1243
CALL
MPLX
MPLX
$58.4B
| $7.96M | 0.01% |
216,900
-83,000
| -28% | -$2.98M |
|
|
BRSL
1244
CALL
Brightstar Lottery PLC
BRSL
$1.9B
| $7.96M | 0.01% |
290,300
+116,800
| +67% | +$3.27M |
|
1245
PUT
Vanguard FTSE Europe ETF
VGK
$29.8B
| $7.96M | 0.01% |
151,100
+21,200
| +16% | +$1.27M |
|
1246
PUT
AstraZeneca
AZN
$261B
| $7.95M | 0.01% |
59,050
-78,150
| -57% | -$10.2M |
|
1247
CALL
Toll Brothers
TOL
$13.7B
| $7.95M | 0.01% |
77,300
-2,500
| -3% | -$208K |
|
|
KRTX
1248
CALL
DELISTED
Karuna Therapeutics, Inc. Common Stock
KRTX
| $7.94M | 0.01% |
25,100
+18,400
| +275% | +$3.58M |
|
|
HOLX
1249
PUT
DELISTED
Hologic
HOLX
| $7.94M | 0.01% |
111,100
+66,600
| +150% | +$4.64M |
|
1250
CALL
Universal Display
OLED
$3.71B
| $7.94M | 0.01% |
41,500
+12,600
| +44% | +$2.08M |
|
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.