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 | |
|---|---|---|---|---|---|---|
|
VRN
3501
DELISTED
Veren
VRN
| $599K | ﹤0.01% |
86,556
+43,978
| +103% | +$324K |
|
|
AMED
3502
PUT
DELISTED
Amedisys
AMED
| $598K | ﹤0.01% |
6,300
+300
| +5% | +$28K |
|
3503
PUT
BCE
BCE
$19.8B
| $598K | ﹤0.01% |
15,200
+7,200
| +90% | +$279K |
|
3504
Agilon Health
AGL
$1.64B
| $597K | ﹤0.01% |
1,903
-1,133
| -37% | -$410K |
|
|
VISN
3505
Vistance Networks Inc
VISN
$2.67B
| $597K | ﹤0.01% |
212,012
+14,915
| +8% | +$32.3K |
|
3506
CALL
Guardant Health
GH
$19.3B
| $597K | ﹤0.01% |
22,100
-6,800
| -24% | -$178K |
|
3507
CALL
Amplitude
AMPL
$1.15B
| $596K | ﹤0.01% |
46,900
+3,500
| +8% | +$38.9K |
|
3508
CALL
MBIA
MBI
$282M
| $596K | ﹤0.01% |
97,500
+68,500
| +236% | +$551K |
|
|
DQ
3509
PUT
Daqo New Energy
DQ
$815M
| $595K | ﹤0.01% |
22,400
-98,900
| -82% | -$2.52M |
|
3510
CALL
Cabaletta Bio
CABA
$444M
| $594K | ﹤0.01% |
26,200
+8,000
| +44% | +$135K |
|
3511
PUT
Harrow
HROW
$1.4B
| $594K | ﹤0.01% |
53,100
+44,600
| +525% | +$528K |
|
3512
KKR & Co
KKR
$91.3B
| $594K | ﹤0.01% |
+7,176
| New | +$486K |
|
3513
Erie Indemnity
ERIE
$11.9B
| $592K | ﹤0.01% |
+1,769
| New | +$531K |
|
3514
CALL
Cardlytics
CDLX
$21.7M
| $591K | ﹤0.01% |
6,420
-4,960
| -44% | -$504K |
|
3515
PUT
Hecla Mining
HL
$10.2B
| $591K | ﹤0.01% |
122,900
+97,500
| +384% | +$430K |
|
3516
Sportradar
SRAD
$4.34B
| $589K | ﹤0.01% |
53,368
+33,155
| +164% | +$326K |
|
3517
Timken Company
TKR
$9.81B
| $589K | ﹤0.01% |
+7,353
| New | +$541K |
|
3518
CALL
AMC Global Media
AMCX
$445M
| $588K | ﹤0.01% |
31,300
+20,400
| +187% | +$302K |
|
3519
CALL
Freedom Holding
FRHC
$9.95B
| $588K | ﹤0.01% |
7,300
-1,300
| -15% | -$106K |
|
3520
CALL
Pentair
PNR
$10.2B
| $588K | ﹤0.01% |
8,100
+5,900
| +268% | +$381K |
|
3521
MDU Resources
MDU
$4.37B
| $586K | ﹤0.01% |
53,511
+52,103
| +3,700% | +$550K |
|
3522
PUT
Navient
NAVI
$809M
| $586K | ﹤0.01% |
31,500
+14,900
| +90% | +$260K |
|
3523
Arrowhead Research
ARWR
$12B
| $585K | ﹤0.01% |
+19,144
| New | +$508K |
|
3524
Core & Main
CNM
$8.17B
| $585K | ﹤0.01% |
14,493
-12,790
| -47% | -$433K |
|
|
LKFT
3525
PUT
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.84B
| $585K | ﹤0.01% |
14,400
-2,000
| -12% | -$73.6K |
|
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.