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 | |
|---|---|---|---|---|---|---|
3876
Universal Display
OLED
$3.85B
| $266K | ﹤0.01% |
2,470
-7,053
| -74% | -$740K |
|
3877
PUT
Penumbra
PEN
$12.6B
| $266K | ﹤0.01% |
1,200
+600
| +100% | +$117K |
|
3878
CALL
SELLAS Life Sciences
SLS
$1.98B
| $266K | ﹤0.01% |
112,800
+83,000
| +279% | +$233K |
|
3879
CALL
Trex
TREX
$4.57B
| $266K | ﹤0.01% |
6,300
-500
| -7% | -$22.7K |
|
3880
CALL
Amplitude
AMPL
$1.16B
| $265K | ﹤0.01% |
22,000
-40,400
| -65% | -$572K |
|
3881
CALL
Medifast
MED
$108M
| $265K | ﹤0.01% |
2,300
-1,700
| -43% | -$198K |
|
3882
TaskUs
TASK
$568M
| $265K | ﹤0.01% |
15,734
+164
| +1% | +$3.08K |
|
3883
PUT
Varonis Systems
VRNS
$5.13B
| $265K | ﹤0.01% |
11,100
-3,900
| -26% | -$89.1K |
|
3884
CALL
Arqit Quantum
ARQQ
$305M
| $264K | ﹤0.01% |
2,936
+2,912
| +12,133% | +$427K |
|
|
NVEE
3885
CALL
DELISTED
NV5 Global
NVEE
| $264K | ﹤0.01% |
8,000
+7,200
| +900% | +$250K |
|
3886
PUT
RPC Inc
RES
$1.14B
| $264K | ﹤0.01% |
29,700
+5,900
| +25% | +$53.3K |
|
|
PACW
3887
CALL
DELISTED
PacWest Bancorp
PACW
| $263K | ﹤0.01% |
11,500
+1,600
| +16% | +$38.8K |
|
3888
Diageo
DEO
$49.4B
| $262K | ﹤0.01% |
1,473
+63
| +4% | +$11.1K |
|
3889
Cedar Fair
FUN
$1.91B
| $262K | ﹤0.01% |
6,355
-328
| -5% | -$13.2K |
|
3890
CALL
OneSpaWorld
OSW
$2.82B
| $262K | ﹤0.01% |
28,100
+14,600
| +108% | +$138K |
|
|
CBAY
3891
CALL
DELISTED
Cymabay Therapeutics
CBAY
| $262K | ﹤0.01% |
41,800
+25,400
| +155% | +$96.5K |
|
|
KNBE
3892
PUT
DELISTED
KnowBe4, Inc. Class A Common Stock
KNBE
| $262K | ﹤0.01% |
10,600
+3,600
| +51% | +$87.6K |
|
3893
PUT
Avnet
AVT
$7.07B
| $261K | ﹤0.01% |
6,300
+5,100
| +425% | +$212K |
|
3894
ProShares Ultra Bloomberg Natural Gas
BOIL
$326M
| $261K | ﹤0.01% |
74
-110
| -60% | -$858K |
|
|
NVRO
3895
PUT
DELISTED
NEVRO CORP.
NVRO
| $261K | ﹤0.01% |
6,600
-15,700
| -70% | -$653K |
|
|
EMBJ
3896
CALL
Embraer S.A. ADS
EMBJ
$12.3B
| $260K | ﹤0.01% |
23,800
+14,300
| +151% | +$145K |
|
|
HDSN
3897
CALL
Hudson Technologies
HDSN
$259M
| $260K | ﹤0.01% |
25,700
-9,800
| -28% | -$95.8K |
|
|
SOHU
3898
Sohu.com
SOHU
$346M
| $260K | ﹤0.01% |
+18,974
| New | +$281K |
|
3899
CALL
Xeris Biopharma Holdings
XERS
$1.42B
| $260K | ﹤0.01% |
195,500
+24,800
| +15% | +$35K |
|
|
CCV
3900
CALL
DELISTED
Churchill Capital Corp V
CCV
| $260K | ﹤0.01% |
26,200
+11,700
| +81% | +$117K |
|
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.