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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6726
Frontdoor
FTDR
$5.22B
| $25K | ﹤0.01% |
724
-16,521
| -96% | -$549K |
|
6727
Flotek Industries
FTK
$856M
| $25K | ﹤0.01% |
+6,486
| New | +$25.2K |
|
6728
Geospace Technologies
GEOS
$88.4M
| $25K | ﹤0.01% |
1,997
-1,172
| -37% | -$14.3K |
|
6729
PUT
Home BancShares
HOMB
$6.31B
| $25K | ﹤0.01% |
+1,000
| New | +$22.3K |
|
6730
CALL
i3 Verticals
IIIV
$420M
| $25K | ﹤0.01% |
+1,200
| New | +$24.1K |
|
6731
CALL
IRIDEX
IRIX
$15.3M
| $25K | ﹤0.01% |
9,100
+4,100
| +82% | +$10.8K |
|
6732
PUT
La-Z-Boy
LZB
$1.65B
| $25K | ﹤0.01% |
+700
| New | +$22.6K |
|
6733
PUT
Microvast
MVST
$256M
| $25K | ﹤0.01% |
18,300
-2,700
| -13% | -$3.62K |
|
6734
CALL
Neumora Therapeutics
NMRA
$311M
| $25K | ﹤0.01% |
+1,500
| New | +$18.4K |
|
6735
CALL
Nerdy
NRDY
$110M
| $25K | ﹤0.01% |
7,500
-6,300
| -46% | -$19.3K |
|
6736
Puma Biotechnology
PBYI
$406M
| $25K | ﹤0.01% |
5,805
+5,048
| +667% | +$16.7K |
|
6737
Precigen
PGEN
$1.97B
| $25K | ﹤0.01% |
19,000
+14,745
| +347% | +$17.3K |
|
6738
CALL
Playtika
PLTK
$1.51B
| $25K | ﹤0.01% |
2,900
-900
| -24% | -$7.82K |
|
6739
VanEck Rare Earth/Strategic Metals ETF
REMX
$1.95B
| $25K | ﹤0.01% |
422
-172
| -29% | -$10.2K |
|
6740
CALL
Saratoga Investment
SAR
$314M
| $25K | ﹤0.01% |
+1,000
| New | +$25K |
|
6741
PUT
Sun Life Financial
SLF
$46.6B
| $25K | ﹤0.01% |
500
-200
| -29% | -$9.84K |
|
6742
Simulations Plus
SLP
$371M
| $25K | ﹤0.01% |
+566
| New | +$22.4K |
|
6743
PUT
SouthState Bank Corp
SSB
$10.3B
| $25K | ﹤0.01% |
+300
| New | +$22.1K |
|
6744
CALL
United States Antimony
UAMY
$772M
| $25K | ﹤0.01% |
103,200
-300
| -0.3% | -$90 |
|
6745
Universal Health Services
UHS
$10.1B
| $25K | ﹤0.01% |
167
-2,968
| -95% | -$399K |
|
|
XXII
6746
PUT
22nd Century Group
XXII
$1.36M
| – | – |
0
| – | – |
|
|
LOGC
6747
DELISTED
ContextLogic
LOGC
| $25K | ﹤0.01% |
4,330
-21,964
| -84% | -$107K |
|
|
PWSC
6748
PUT
DELISTED
PowerSchool Holdings, Inc.
PWSC
| $25K | ﹤0.01% |
+1,100
| New | +$24.2K |
|
|
ASXC
6749
CALL
DELISTED
Asensus Surgical, Inc.
ASXC
| $25K | ﹤0.01% |
79,400
-15,700
| -17% | -$4.05K |
|
|
FTCH
6750
DELISTED
Farfetch Limited Class A Ordinary Shares
FTCH
| $25K | ﹤0.01% |
1,157,978
+713,988
| +161% | +$1.09M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.