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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6776
ProShares Short S&P500
SH
$928M
| $29K | ﹤0.01% |
+618
| New | +$30.9K |
|
|
SLNO
6777
PUT
DELISTED
Soleno Therapeutics
SLNO
| $29K | ﹤0.01% |
700
-19,300
| -97% | -$873K |
|
6778
Spok Holdings
SPOK
$229M
| $29K | ﹤0.01% |
1,879
-1,210
| -39% | -$19.9K |
|
6779
Viavi Solutions
VIAV
$7.95B
| $29K | ﹤0.01% |
3,269
-4,913
| -60% | -$48.2K |
|
6780
PUT
Voya Financial
VOYA
$8.96B
| $29K | ﹤0.01% |
400
-1,700
| -81% | -$120K |
|
6781
PUT
Viridian Therapeutics
VRDN
$2.2B
| $29K | ﹤0.01% |
1,700
-1,200
| -41% | -$23.3K |
|
6782
Varonis Systems
VRNS
$4.67B
| $29K | ﹤0.01% |
+632
| New | +$30.1K |
|
|
WOW
6783
CALL
DELISTED
WideOpenWest
WOW
| $29K | ﹤0.01% |
8,100
+900
| +13% | +$3.21K |
|
6784
PUT
X4 Pharmaceuticals
XFOR
$377M
| $29K | ﹤0.01% |
717
+210
| +41% | +$5.84K |
|
6785
PUT
Expro Ltd
XPRO
$1.64B
| $29K | ﹤0.01% |
1,500
-1,100
| -42% | -$19.7K |
|
|
YMAB
6786
CALL
DELISTED
Y-mAbs Therapeutics
YMAB
| $29K | ﹤0.01% |
1,800
+900
| +100% | +$12.1K |
|
|
INVX
6787
PUT
Innovex International
INVX
$1.8B
| $29K | ﹤0.01% |
1,300
-400
| -24% | -$8.75K |
|
|
ATSG
6788
DELISTED
Air Transport Services Group
ATSG
| $29K | ﹤0.01% |
2,176
-6,782
| -76% | -$97.8K |
|
6789
CALL
Adtran
ADTN
$675M
| $28K | ﹤0.01% |
+5,300
| New | +$33.8K |
|
6790
Aegon
AEG
$13.3B
| $28K | ﹤0.01% |
+4,633
| New | +$27K |
|
6791
Anixa Biosciences
ANIX
$118M
| $28K | ﹤0.01% |
9,051
+8,758
| +2,989% | +$34.9K |
|
6792
CALL
Alpha and Omega Semiconductor
AOSL
$829M
| $28K | ﹤0.01% |
1,300
+700
| +117% | +$16.9K |
|
6793
CALL
Alpha Pro Tech
APT
$49.9M
| $28K | ﹤0.01% |
4,600
-56,700
| -92% | -$310K |
|
6794
PUT
AptarGroup
ATR
$8.69B
| $28K | ﹤0.01% |
+200
| New | +$27.1K |
|
|
SRTA
6795
Strata Critical Medical Inc
SRTA
$421M
| $28K | ﹤0.01% |
10,161
-2,970
| -23% | -$9.16K |
|
6796
Cerus
CERS
$575M
| $28K | ﹤0.01% |
+14,958
| New | +$30.5K |
|
6797
PUT
Clene
CLNN
$60.3M
| $28K | ﹤0.01% |
3,365
-2,060
| -38% | -$17.8K |
|
6798
CALL
Full House Resorts
FLL
$83.4M
| $28K | ﹤0.01% |
+5,200
| New | +$25.7K |
|
6799
CALL
First Trust Enhanced Short Maturity ETF
FTSM
$6.51B
| $28K | ﹤0.01% |
600
| – | – |
|
6800
Genmab
GMAB
$17.5B
| $28K | ﹤0.01% |
951
-450
| -32% | -$13.2K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.