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 | |
|---|---|---|---|---|---|---|
|
UROY
4951
Uranium Royalty Corp
UROY
$540M
| $153K | ﹤0.01% |
56,737
+30,406
| +115% | +$85.2K |
|
4952
PUT
Voya Financial
VOYA
$9.09B
| $153K | ﹤0.01% |
2,100
-800
| -28% | -$55.8K |
|
|
CRON
4953
CALL
Cronos Group
CRON
$1.08B
| $152K | ﹤0.01% |
73,200
-52,800
| -42% | -$103K |
|
4954
CALL
GoodRx Holdings
GDRX
$1.07B
| $152K | ﹤0.01% |
22,700
+10,300
| +83% | +$58K |
|
4955
PUT
Integra LifeSciences
IART
$1.33B
| $152K | ﹤0.01% |
+3,500
| New | +$138K |
|
4956
Lindsay Corp
LNN
$1.12B
| $152K | ﹤0.01% |
1,182
+486
| +70% | +$59.6K |
|
4957
PUT
Playtika
PLTK
$1.51B
| $152K | ﹤0.01% |
17,500
+16,700
| +2,088% | +$145K |
|
|
RNAM
4958
CALL
DELISTED
Avidity Biosciences
RNAM
| $152K | ﹤0.01% |
16,900
-3,700
| -18% | -$24.7K |
|
4959
CALL
Root
ROOT
$919M
| $152K | ﹤0.01% |
33,800
+7,900
| +31% | +$78.4K |
|
|
STR
4960
CALL
DELISTED
Sitio Royalties
STR
| $152K | ﹤0.01% |
6,500
+100
| +2% | +$2.32K |
|
4961
PUT
Black Hills Corp
BKH
$5.5B
| $151K | ﹤0.01% |
2,800
-200
| -7% | -$10.3K |
|
4962
Braze
BRZE
$2.82B
| $151K | ﹤0.01% |
2,854
+2,813
| +6,861% | +$139K |
|
4963
CALL
Cogent Biosciences
COGT
$7.07B
| $151K | ﹤0.01% |
25,700
+17,100
| +199% | +$131K |
|
4964
CALL
Torrid Holdings
CURV
$260M
| $151K | ﹤0.01% |
26,300
+24,800
| +1,653% | +$84.9K |
|
4965
PUT
Commault Systems
CVLT
$4.82B
| $151K | ﹤0.01% |
1,900
+400
| +27% | +$28.6K |
|
4966
G-III Apparel Group
GIII
$1.55B
| $151K | ﹤0.01% |
+4,462
| New | +$126K |
|
4967
PUT
Goosehead Insurance
GSHD
$2.27B
| $151K | ﹤0.01% |
2,000
+700
| +54% | +$50.6K |
|
4968
PUT
Methanex
MEOH
$4.27B
| $151K | ﹤0.01% |
3,200
-2,400
| -43% | -$104K |
|
|
RDNW
4969
CALL
RideNow Group
RDNW
$248M
| $151K | ﹤0.01% |
18,600
+14,400
| +343% | +$92.4K |
|
4970
CALL
SSR Mining
SSRM
$5.54B
| $151K | ﹤0.01% |
14,100
-9,300
| -40% | -$113K |
|
4971
PUT
TPG
TPG
$6.85B
| $151K | ﹤0.01% |
3,500
+2,600
| +289% | +$87.8K |
|
|
EGRX
4972
DELISTED
Eagle Pharmaceuticals, Inc.
EGRX
| $151K | ﹤0.01% |
28,949
+28,719
| +12,487% | +$284K |
|
4973
AppFolio
APPF
$6.23B
| $150K | ﹤0.01% |
+869
| New | +$163K |
|
4974
CALL
Heron Therapeutics
HRTX
$94.1M
| $150K | ﹤0.01% |
88,300
-302,700
| -77% | -$333K |
|
|
SFIX
4975
CALL
Stitch Fix
SFIX
$547M
| $150K | ﹤0.01% |
42,100
+7,200
| +21% | +$25.4K |
|
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.