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 | |
|---|---|---|---|---|---|---|
6251
CALL
RenaissanceRe
RNR
$13.3B
| $36K | ﹤0.01% |
200
-300
| -60% | -$50.5K |
|
|
6252
PUT
RenaissanceRe
RNR
$13.3B
| $36K | ﹤0.01% |
200
-100
| -33% | -$16.9K |
|
6253
CALL
Shenandoah Telecom
SHEN
$664M
| $36K | ﹤0.01% |
2,300
+1,500
| +188% | +$27.4K |
|
6254
PUT
Alaunos Therapeutics
TCRT
$4.59M
| $36K | ﹤0.01% |
379
-566
| -60% | -$82K |
|
|
SUNW
6255
CALL
DELISTED
Sunworks, Inc.
SUNW
| $36K | ﹤0.01% |
23,100
-25,500
| -52% | -$57.2K |
|
|
FATH
6256
CALL
DELISTED
Fathom Digital Manufacturing Corporation
FATH
| $36K | ﹤0.01% |
1,400
-8,045
| -85% | -$351K |
|
|
IELG
6257
CALL
DELISTED
ISHARES ENHANCED U.S. LARGE CAP ETF
IELG
| $36K | ﹤0.01% |
1,300
+1,000
| +333% | +$27.7K |
|
6258
PUT
Asbury Automotive
ABG
$4.31B
| $35K | ﹤0.01% |
200
| – | – |
|
6259
CALL
Alector
ALEC
$168M
| $35K | ﹤0.01% |
3,800
-9,200
| -71% | -$80.2K |
|
6260
ATN International
ATNI
$366M
| $35K | ﹤0.01% |
775
+675
| +675% | +$29.5K |
|
6261
PUT
Avantor
AVTR
$9.32B
| $35K | ﹤0.01% |
1,700
-1,800
| -51% | -$37.3K |
|
6262
Blackrock
BLK
$169B
| $35K | ﹤0.01% |
50
-7,597
| -99% | -$5.07M |
|
6263
PUT
Cohu
COHU
$2.26B
| $35K | ﹤0.01% |
1,100
-600
| -35% | -$19.4K |
|
6264
PUT
Cue Biopharma
CUE
$113M
| $35K | ﹤0.01% |
413
+73
| +21% | +$6.68K |
|
|
CUK
6265
DELISTED
Carnival PLC
CUK
| $35K | ﹤0.01% |
4,870
-5,821
| -54% | -$44.9K |
|
6266
CALL
CuriosityStream
CURI
$145M
| $35K | ﹤0.01% |
31,500
-600
| -2% | -$779 |
|
6267
CALL
FormFactor
FORM
$8.28B
| $35K | ﹤0.01% |
1,600
-300
| -16% | -$6.99K |
|
6268
PUT
H.B. Fuller
FUL
$2.97B
| $35K | ﹤0.01% |
500
-100
| -17% | -$7.22K |
|
6269
CALL
GCM Grosvenor
GCMG
$754M
| $35K | ﹤0.01% |
4,600
| – | – |
|
6270
PUT
Gilat Satellite Networks
GILT
$834M
| $35K | ﹤0.01% |
6,200
-1,400
| -18% | -$7.92K |
|
6271
iShares Expanded Tech Sector ETF
IGM
$10B
| $35K | ﹤0.01% |
750
-6,006
| -89% | -$288K |
|
|
INFA
6272
CALL
DELISTED
Informatica
INFA
| $35K | ﹤0.01% |
2,200
-99,200
| -98% | -$1.78M |
|
6273
CALL
Kadant
KAI
$3.63B
| $35K | ﹤0.01% |
+200
| New | +$35.6K |
|
|
6274
PUT
Kadant
KAI
$3.63B
| $35K | ﹤0.01% |
+200
| New | +$35.6K |
|
6275
LSI Industries
LYTS
$859M
| $35K | ﹤0.01% |
+2,877
| New | +$28.8K |
|
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.