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 | |
|---|---|---|---|---|---|---|
4701
PUT
GoodRx Holdings
GDRX
$1.09B
| $196K | ﹤0.01% |
29,300
-7,900
| -21% | -$44.5K |
|
|
HI
4702
CALL
DELISTED
Hillenbrand
HI
| $196K | ﹤0.01% |
4,100
+4,000
| +4,000% | +$164K |
|
4703
CALL
SK Telecom
SKM
$11.4B
| $196K | ﹤0.01% |
9,200
+5,300
| +136% | +$112K |
|
|
FRGE
4704
CALL
DELISTED
Forge Global Holdings
FRGE
| $195K | ﹤0.01% |
3,800
-273
| -7% | -$11.6K |
|
4705
Martin Marietta Materials
MLM
$34.2B
| $195K | ﹤0.01% |
+392
| New | +$177K |
|
4706
PUT
Universal Corp
UVV
$1.37B
| $195K | ﹤0.01% |
2,900
+200
| +7% | +$10.7K |
|
|
WNS
4707
DELISTED
WNS Holdings
WNS
| $195K | ﹤0.01% |
+3,094
| New | +$189K |
|
4708
CALL
Akebia Therapeutics
AKBA
$338M
| $194K | ﹤0.01% |
156,800
-162,000
| -51% | -$165K |
|
4709
CALL
Capricor Therapeutics
CAPR
$380M
| $194K | ﹤0.01% |
39,800
+3,800
| +11% | +$12.4K |
|
|
DHC
4710
Diversified Healthcare Trust
DHC
$2.15B
| $194K | ﹤0.01% |
52,099
-59,852
| -53% | -$141K |
|
4711
PUT
Krispy Kreme
DNUT
$562M
| $194K | ﹤0.01% |
12,900
+4,400
| +52% | +$58.2K |
|
4712
Genworth Financial
GNW
$3.86B
| $194K | ﹤0.01% |
+29,154
| New | +$177K |
|
4713
CALL
OFS Capital
OFS
$46.2M
| $194K | ﹤0.01% |
16,600
+14,900
| +876% | +$161K |
|
|
OTLY
4714
Oatly Group
OTLY
$476M
| $194K | ﹤0.01% |
8,238
+7,464
| +964% | +$123K |
|
4715
Teekay
TK
$996M
| $194K | ﹤0.01% |
+27,244
| New | +$188K |
|
4716
Valvoline
VVV
$5.06B
| $194K | ﹤0.01% |
5,174
-14,007
| -73% | -$469K |
|
|
ACRE
4717
PUT
Ares Commercial Real Estate
ACRE
$247M
| $193K | ﹤0.01% |
18,700
-15,700
| -46% | -$155K |
|
4718
CALL
BBVA Argentina
BBAR
$3.85B
| $193K | ﹤0.01% |
35,500
-15,400
| -30% | -$72.5K |
|
4719
CALL
Culp Inc
CULP
$45.2M
| $193K | ﹤0.01% |
+33,500
| New | +$182K |
|
4720
PUT
Amdocs
DOX
$6.03B
| $193K | ﹤0.01% |
2,200
+1,000
| +83% | +$83.3K |
|
4721
Progress Software
PRGS
$1.75B
| $193K | ﹤0.01% |
+3,561
| New | +$189K |
|
|
TBCH
4722
Turtle Beach Corp
TBCH
$238M
| $193K | ﹤0.01% |
17,649
-21,169
| -55% | -$207K |
|
|
AMAM
4723
CALL
DELISTED
Ambrx Biopharma Inc
AMAM
| $193K | ﹤0.01% |
13,600
-189,400
| -93% | -$2.15M |
|
4724
CALL
Compass
COMP
$8.67B
| $192K | ﹤0.01% |
51,100
+37,400
| +273% | +$92.3K |
|
|
LTC
4725
CALL
LTC Properties
LTC
$2.13B
| $192K | ﹤0.01% |
6,000
-7,500
| -56% | -$243K |
|
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.