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 | |
|---|---|---|---|---|---|---|
|
NEXN
5376
PUT
Nexxen International
NEXN
$571M
| $76K | ﹤0.01% |
11,900
+500
| +4% | +$3.66K |
|
5377
Patterson-UTI
PTEN
$3.91B
| $76K | ﹤0.01% |
+4,539
| New | +$74.9K |
|
|
HTT
5378
CALL
High Templar Tech Ltd
HTT
$373M
| $76K | ﹤0.01% |
80,700
-14,900
| -16% | -$13.1K |
|
5379
CALL
Replimune Group
REPL
$908M
| $76K | ﹤0.01% |
2,800
-1,900
| -40% | -$39.5K |
|
5380
CALL
Trupanion
TRUP
$1.06B
| $76K | ﹤0.01% |
1,600
-34,200
| -96% | -$1.78M |
|
5381
PUT
United Microelectronic
UMC
$48.6B
| $76K | ﹤0.01% |
11,700
-195,700
| -94% | -$1.3M |
|
|
FXLV
5382
CALL
DELISTED
F45 Training Holdings Inc.
FXLV
| $76K | ﹤0.01% |
26,700
-108,500
| -80% | -$329K |
|
|
AVEO
5383
PUT
DELISTED
AVEO Pharmaceuticals, Inc.
AVEO
| $76K | ﹤0.01% |
5,100
+1,500
| +42% | +$20.8K |
|
|
CMAX
5384
DELISTED
CareMax, Inc. Class A Common Stock
CMAX
| $76K | ﹤0.01% |
701
+563
| +408% | +$84.2K |
|
|
BAND
5385
PUT
Bandwidth Inc
BAND
$1.26B
| $75K | ﹤0.01% |
3,300
+200
| +6% | +$3.64K |
|
5386
CALL
Boise Cascade
BCC
$2.67B
| $75K | ﹤0.01% |
1,100
-1,000
| -48% | -$68.3K |
|
|
KEEL
5387
CALL
Keel Infrastructure Corp
KEEL
$2.46B
| $75K | ﹤0.01% |
172,400
-251,700
| -59% | -$185K |
|
5388
PUT
Griffon
GFF
$3.98B
| $75K | ﹤0.01% |
2,100
-4,600
| -69% | -$154K |
|
5389
PUT
Hims & Hers Health
HIMS
$6.36B
| $75K | ﹤0.01% |
11,800
-28,600
| -71% | -$163K |
|
5390
James River Group Holdings
JRVR
$204M
| $75K | ﹤0.01% |
+3,608
| New | +$82.8K |
|
5391
Avita Medical
RCEL
$133M
| $75K | ﹤0.01% |
11,513
-26,298
| -70% | -$158K |
|
5392
PUT
Regency Centers
REG
$14.7B
| $75K | ﹤0.01% |
1,200
-26,700
| -96% | -$1.64M |
|
5393
PUT
SEI Investments
SEIC
$12.2B
| $75K | ﹤0.01% |
1,300
-2,100
| -62% | -$118K |
|
5394
PUT
TH International
THCH
$58M
| $75K | ﹤0.01% |
5,440
+4,660
| +597% | +$87.2K |
|
5395
United Airlines
UAL
$39.6B
| $75K | ﹤0.01% |
2,000
-43,682
| -96% | -$1.77M |
|
|
VPU
5396
Vanguard Utilities ETF
VPU
$8.5B
| $75K | ﹤0.01% |
492
-2,417
| -83% | -$358K |
|
5397
Wintrust Financial
WTFC
$10.7B
| $75K | ﹤0.01% |
898
+137
| +18% | +$12.1K |
|
|
NETI
5398
PUT
DELISTED
Eneti Inc.
NETI
| $75K | ﹤0.01% |
7,500
-54,400
| -88% | -$483K |
|
|
PRTK
5399
CALL
DELISTED
Paratek Pharmaceuticals, Inc.
PRTK
| $75K | ﹤0.01% |
40,400
+21,700
| +116% | +$54.1K |
|
5400
CALL
Sphere 3D
ANY
$17.2M
| $74K | ﹤0.01% |
3,847
-490
| -11% | -$12.8K |
|
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.