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 | |
|---|---|---|---|---|---|---|
3626
PUT
Guidewire Software
GWRE
$12.4B
| $534K | ﹤0.01% |
4,900
-20,600
| -81% | -$1.97M |
|
|
PINC
3627
DELISTED
Premier
PINC
| $534K | ﹤0.01% |
23,908
+13,436
| +128% | +$278K |
|
3628
New Oriental
EDU
$7.94B
| $533K | ﹤0.01% |
+7,282
| New | +$505K |
|
3629
CALL
Kilroy Realty
KRC
$4.58B
| $533K | ﹤0.01% |
13,400
+12,900
| +2,580% | +$425K |
|
3630
PUT
Acuity Brands
AYI
$10.1B
| $532K | ﹤0.01% |
2,600
+1,400
| +117% | +$253K |
|
3631
United States Copper Index Fund
CPER
$750M
| $532K | ﹤0.01% |
22,063
+15,739
| +249% | +$364K |
|
3632
CALL
Zeta Global
ZETA
$5.17B
| $532K | ﹤0.01% |
60,400
+4,700
| +8% | +$39.4K |
|
3633
PUT
Chord Energy
CHRD
$7.42B
| $531K | ﹤0.01% |
3,200
-9,700
| -75% | -$1.59M |
|
3634
HF Sinclair
DINO
$16.4B
| $531K | ﹤0.01% |
9,571
+1,450
| +18% | +$79.1K |
|
3635
CALL
GFL Environmental
GFL
$14.1B
| $531K | ﹤0.01% |
15,400
+9,400
| +157% | +$286K |
|
3636
PUT
SoundHound AI
SOUN
$2.79B
| $531K | ﹤0.01% |
250,800
-111,400
| -31% | -$221K |
|
|
HIBB
3637
DELISTED
Hibbett, Inc. Common Stock
HIBB
| $530K | ﹤0.01% |
7,365
+4,012
| +120% | +$225K |
|
3638
CALL
Alarm.com
ALRM
$2.65B
| $529K | ﹤0.01% |
8,200
+7,300
| +811% | +$419K |
|
3639
Jabil
JBL
$32.6B
| $529K | ﹤0.01% |
4,156
-2,689
| -39% | -$342K |
|
3640
PUT
LegalZoom.com
LZ
$1.3B
| $529K | ﹤0.01% |
46,900
-1,700
| -3% | -$18.5K |
|
3641
PUT
UWM Holdings
UWMC
$624M
| $529K | ﹤0.01% |
74,100
+14,200
| +24% | +$80.2K |
|
3642
PUT
Mirum Pharmaceuticals
MIRM
$6.96B
| $528K | ﹤0.01% |
17,900
+10,100
| +129% | +$306K |
|
|
HA
3643
CALL
DELISTED
Hawaiian Holdings, Inc.
HA
| $528K | ﹤0.01% |
37,200
+17,300
| +87% | +$128K |
|
3644
CALL
Aspen Aerogels
ASPN
$385M
| $527K | ﹤0.01% |
33,400
-11,600
| -26% | -$120K |
|
3645
CALL
Commault Systems
CVLT
$6.19B
| $527K | ﹤0.01% |
6,600
+1,100
| +20% | +$78.6K |
|
|
ACH
3646
PUT
Accendra Health
ACH
$247M
| $527K | ﹤0.01% |
27,400
+27,300
| +27,300% | +$494K |
|
3647
Skywest
SKYW
$4.37B
| $527K | ﹤0.01% |
10,105
-7,124
| -41% | -$320K |
|
3648
Methanex
MEOH
$4.19B
| $526K | ﹤0.01% |
+11,114
| New | +$483K |
|
3649
CALL
Towne Bank
TOWN
$3.45B
| $526K | ﹤0.01% |
17,700
-9,800
| -36% | -$254K |
|
3650
CALL
C4 Therapeutics
CCCC
$397M
| $525K | ﹤0.01% |
93,000
+91,100
| +4,795% | +$208K |
|
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.