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 |
Amazon
AMZN
|
+$170M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$71.3M |
| 3 |
AT&T
T
|
+$44.2M |
| 4 |
Meta Platforms (Facebook)
META
|
+$37.1M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$34.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Microsoft
MSFT
|
+$94.3M |
| 2 |
JPMorgan Chase
JPM
|
+$68.2M |
| 3 |
Citigroup
C
|
+$62.8M |
| 4 |
Berkshire Hathaway Class B
BRK.B
|
+$50.9M |
| 5 |
SPDR Gold Trust
GLD
|
+$46.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.38% |
| 2 | Technology | 0.35% |
| 3 | Communication Services | 0.24% |
| 4 | Healthcare | 0.2% |
| 5 | Consumer Staples | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5551
PUT
InfraCap MLP ETF
AMZA
$470M
| $64K | ﹤0.01% |
2,700
-4,500
| -63% | -$143K |
|
5552
CALL
Ashland
ASH
$3.33B
| $64K | ﹤0.01% |
600
+100
| +20% | +$10.5K |
|
5553
PUT
Alphatec Holdings
ATEC
$1.46B
| $64K | ﹤0.01% |
5,200
+3,200
| +160% | +$32.3K |
|
|
LONA
5554
CALL
LeonaBio Inc
LONA
$66.3M
| $64K | ﹤0.01% |
2,030
-3,710
| -65% | -$117K |
|
5555
PUT
Core Laboratories
CLB
$490M
| $64K | ﹤0.01% |
+3,200
| New | +$62K |
|
|
LDTC
5556
PUT
DELISTED
LeddarTech
LDTC
| $64K | ﹤0.01% |
13,000
| – | – |
|
5557
PUT
Medallion Financial
MFIN
$229M
| $64K | ﹤0.01% |
9,000
| – | – |
|
5558
CALL
Mueller Industries
MLI
$14.7B
| $64K | ﹤0.01% |
4,400
+3,600
| +450% | +$57.4K |
|
5559
NovaGold Resources
NG
$2.56B
| $64K | ﹤0.01% |
10,778
+10,434
| +3,033% | +$55.6K |
|
5560
Intellia Therapeutics
NTLA
$1.49B
| $64K | ﹤0.01% |
1,849
-195
| -10% | -$9.27K |
|
5561
PUT
Rimini Street
RMNI
$445M
| $64K | ﹤0.01% |
16,900
+16,600
| +5,533% | +$73.7K |
|
5562
PUT
Red Rock Resorts
RRR
$3.77B
| $64K | ﹤0.01% |
1,600
-11,300
| -88% | -$464K |
|
|
RVPH
5563
PUT
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
| $64K | ﹤0.01% |
760
+5
| +0.7% | +$381 |
|
5564
CALL
Rhythm Pharmaceuticals
RYTM
$6.81B
| $64K | ﹤0.01% |
2,200
-69,000
| -97% | -$1.77M |
|
5565
SK Telecom
SKM
$12.1B
| $64K | ﹤0.01% |
3,144
+1,720
| +121% | +$34.9K |
|
|
SLI
5566
Standard Lithium
SLI
$502M
| $64K | ﹤0.01% |
21,724
-15,963
| -42% | -$61.7K |
|
|
PGTI
5567
PUT
DELISTED
PGT, Inc.
PGTI
| $64K | ﹤0.01% |
+3,600
| New | +$73.3K |
|
5568
CALL
Adaptive Biotechnologies
ADPT
$3.59B
| $63K | ﹤0.01% |
8,300
-15,800
| -66% | -$123K |
|
5569
Amkor Technology
AMKR
$12.4B
| $63K | ﹤0.01% |
+2,650
| New | +$61.4K |
|
5570
PUT
Brixmor Property Group
BRX
$9.67B
| $63K | ﹤0.01% |
2,800
-300
| -10% | -$6.42K |
|
5571
CALL
Ecopetrol
EC
$34.5B
| $63K | ﹤0.01% |
6,100
-4,700
| -44% | -$45.8K |
|
5572
PUT
8x8 Inc
EGHT
$269M
| $63K | ﹤0.01% |
14,600
-20,800
| -59% | -$83.6K |
|
5573
CALL
IDEAYA Biosciences
IDYA
$3.42B
| $63K | ﹤0.01% |
3,500
-800
| -19% | -$13.5K |
|
5574
IHS Holding
IHS
$2.76B
| $63K | ﹤0.01% |
+10,401
| New | +$64.8K |
|
5575
KLX Energy Services
KLXE
$45M
| $63K | ﹤0.01% |
3,647
-18,884
| -84% | -$266K |
|
Similar funds
Simplex Trading's Q4 2022 Portfolio in Review
As of Q4 2022, Simplex Trading held 11,206 positions worth $91.9B, up 3.9% from $88.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.
Simplex Trading's Q4 2022 filing shows 1,219 new, 3,365 increased, 4,370 reduced and 1,942 closed positions. Its largest new stake was iShares MSCI Emerging Markets ETF: 932,756 shares worth $35.4M. The largest sale was Microsoft, an estimated $94.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.38% of assets, up from 0.3% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q4 2022 buy was iShares MSCI Emerging Markets ETF: 932,756 shares worth $35.4M.
- Simplex Trading added most to Amazon in Q4 2022, an estimated $170M increase.
- Simplex Trading's biggest Q4 2022 reduction was Microsoft, cutting an estimated $94.3M.
- Simplex Trading fully exited JPMorgan Chase in Q4 2022, selling an estimated $68.2M.
- Simplex Trading's ten largest holdings make up 34% of its $91.9B portfolio in Q4 2022.
- Simplex Trading opened 1,219 new positions and closed 1,942 in Q4 2022.
- Simplex Trading's portfolio value rose 3.9% quarter-over-quarter to $91.9B.
Based on Simplex Trading's 13F filing for Q4 2022, filed 2 Feb 2023.