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 | |
|---|---|---|---|---|---|---|
3076
PUT
America Movil
AMX
$78.1B
| $926K | ﹤0.01% |
50,000
-93,400
| -65% | -$1.64M |
|
3077
CALL
Birkenstock
BIRK
$7.47B
| $925K | ﹤0.01% |
+19,000
| New | +$823K |
|
3078
PUT
IQVIA
IQV
$34.7B
| $925K | ﹤0.01% |
4,000
-22,200
| -85% | -$4.56M |
|
3079
CALL
Live Oak Bancshares
LOB
$1.95B
| $923K | ﹤0.01% |
20,300
-1,000
| -5% | -$33.6K |
|
3080
CALL
Meritage Homes
MTH
$4.87B
| $923K | ﹤0.01% |
10,600
+9,400
| +783% | +$648K |
|
|
SILV
3081
DELISTED
SilverCrest Metals Inc. Common Shares
SILV
| $918K | ﹤0.01% |
140,175
+71,063
| +103% | +$396K |
|
3082
CALL
FuboTV Inc
FUBO
$245M
| $916K | ﹤0.01% |
24,025
-28,092
| -54% | -$972K |
|
3083
PUT
Sociedad Química y Minera de Chile
SQM
$19.6B
| $915K | ﹤0.01% |
15,200
+4,700
| +45% | +$249K |
|
3084
CALL
Casella Waste Systems
CWST
$5.69B
| $914K | ﹤0.01% |
+10,700
| New | +$860K |
|
3085
PUT
BigBear.ai
BBAI
$1.32B
| $912K | ﹤0.01% |
426,600
+17,000
| +4% | +$27.5K |
|
|
JMIA
3086
PUT
Jumia Technologies
JMIA
$726M
| $911K | ﹤0.01% |
258,300
-246,400
| -49% | -$741K |
|
3087
Madrigal Pharmaceuticals
MDGL
$12.6B
| $910K | ﹤0.01% |
3,934
-1,702
| -30% | -$298K |
|
3088
PUT
Trex
TREX
$4.51B
| $910K | ﹤0.01% |
11,000
+2,700
| +33% | +$179K |
|
3089
PUT
Acadia Healthcare
ACHC
$3.17B
| $909K | ﹤0.01% |
+11,700
| New | +$866K |
|
3090
iShares Core MSCI EAFE ETF
IEFA
$186B
| $906K | ﹤0.01% |
12,880
+10,685
| +487% | +$704K |
|
3091
Nutrien
NTR
$32.7B
| $905K | ﹤0.01% |
16,071
-148,206
| -90% | -$8.38M |
|
3092
PUT
JPMorgan Inflation Managed Bond ETF
JCPI
$865M
| $903K | ﹤0.01% |
18,100
-18,400
| -50% | -$835K |
|
3093
CALL
Metropolitan Bank Holding Corp
MCB
$1.13B
| $902K | ﹤0.01% |
16,300
-12,700
| -44% | -$501K |
|
|
NAPA
3094
CALL
DELISTED
The Duckhorn Portfolio, Inc.
NAPA
| $902K | ﹤0.01% |
91,600
+91,100
| +18,220% | +$920K |
|
|
AMWD
3095
CALL
DELISTED
American Woodmark
AMWD
| $900K | ﹤0.01% |
9,700
+3,300
| +52% | +$257K |
|
3096
PUT
Immatics
IMTX
$1.24B
| $898K | ﹤0.01% |
85,300
+36,200
| +74% | +$333K |
|
3097
CALL
Bruker
BRKR
$9.2B
| $896K | ﹤0.01% |
12,200
-29,200
| -71% | -$1.87M |
|
3098
PUT
NexGen Energy
NXE
$6.05B
| $896K | ﹤0.01% |
128,100
+98,500
| +333% | +$613K |
|
3099
PTC
PTC
$13.7B
| $896K | ﹤0.01% |
5,126
+4,449
| +657% | +$682K |
|
3100
CALL
United Microelectronic
UMC
$48.9B
| $895K | ﹤0.01% |
105,900
-115,600
| -52% | -$881K |
|
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.