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 | |
|---|---|---|---|---|---|---|
1426
CALL
Silicon Motion
SIMO
$9.34B
| $5.89M | ﹤0.01% |
96,200
-127,300
| -57% | -$7.28M |
|
1427
CALL
Array Technologies
ARRY
$835M
| $5.89M | ﹤0.01% |
350,500
+190,600
| +119% | +$3.29M |
|
|
ETRN
1428
CALL
DELISTED
Equitrans Midstream Corporation Common Stock
ETRN
| $5.87M | ﹤0.01% |
577,000
+353,000
| +158% | +$3.32M |
|
1429
CALL
Kinsale Capital Group
KNSL
$8.03B
| $5.86M | ﹤0.01% |
17,500
+8,500
| +94% | +$3.15M |
|
1430
PUT
Moody's
MCO
$82.6B
| $5.86M | ﹤0.01% |
15,000
-6,000
| -29% | -$2.09M |
|
|
COOP
1431
PUT
DELISTED
Mr. Cooper
COOP
| $5.85M | ﹤0.01% |
89,900
+8,000
| +10% | +$473K |
|
1432
CALL
Wabtec
WAB
$50.9B
| $5.85M | ﹤0.01% |
46,100
+22,800
| +98% | +$2.57M |
|
1433
PUT
Corning
GLW
$129B
| $5.85M | ﹤0.01% |
192,100
+91,400
| +91% | +$2.61M |
|
1434
CALL
Celestica
CLS
$36.2B
| $5.84M | ﹤0.01% |
199,600
+130,100
| +187% | +$3.46M |
|
1435
PUT
Thor Industries
THO
$4B
| $5.84M | ﹤0.01% |
49,400
-7,500
| -13% | -$750K |
|
1436
CALL
First Majestic Silver
AG
$8.14B
| $5.83M | ﹤0.01% |
947,800
+304,100
| +47% | +$1.68M |
|
1437
PUT
Molson Coors Class B
TAP
$7.67B
| $5.83M | ﹤0.01% |
95,200
+63,600
| +201% | +$3.82M |
|
1438
American Electric Power
AEP
$73.7B
| $5.83M | ﹤0.01% |
+71,732
| New | +$5.57M |
|
|
BNY
1439
Bank of New York Mellon
BNY
$108B
| $5.81M | ﹤0.01% |
111,586
-13,832
| -11% | -$637K |
|
1440
CALL
Omnicom Group
OMC
$22.7B
| $5.8M | ﹤0.01% |
67,100
-400
| -0.6% | -$31.5K |
|
1441
PUT
CBRE Group
CBRE
$40.9B
| $5.8M | ﹤0.01% |
62,300
+28,900
| +87% | +$2.25M |
|
1442
CALL
Dutch Bros
BROS
$8.84B
| $5.78M | ﹤0.01% |
182,600
-33,100
| -15% | -$902K |
|
1443
PUT
Trane Technologies
TT
$107B
| $5.78M | ﹤0.01% |
23,700
-4,400
| -16% | -$963K |
|
|
ARR
1444
PUT
Armour Residential REIT
ARR
$2.02B
| $5.78M | ﹤0.01% |
299,100
+267,280
| +840% | +$4.72M |
|
1445
PUT
Sensata Technologies
ST
$6.7B
| $5.77M | ﹤0.01% |
153,600
+149,000
| +3,239% | +$5.15M |
|
1446
Allstate
ALL
$66.6B
| $5.77M | ﹤0.01% |
41,208
+21,453
| +109% | +$2.8M |
|
|
CPE
1447
CALL
DELISTED
Callon Petroleum Company
CPE
| $5.77M | ﹤0.01% |
178,000
+55,800
| +46% | +$1.91M |
|
1448
PUT
Bank OZK
OZK
$5.49B
| $5.76M | ﹤0.01% |
115,600
-73,900
| -39% | -$3.05M |
|
|
SKX
1449
CALL
DELISTED
Skechers
SKX
| $5.76M | ﹤0.01% |
92,400
-8,400
| -8% | -$453K |
|
1450
CALL
Axcelis
ACLS
$4.21B
| $5.76M | ﹤0.01% |
44,400
+12,200
| +38% | +$1.68M |
|
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.