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 | |
|---|---|---|---|---|---|---|
|
OPTU
3376
PUT
Optimum Communications Inc
OPTU
$298M
| $689K | ﹤0.01% |
212,200
+208,800
| +6,141% | +$547K |
|
3377
CALL
Rhythm Pharmaceuticals
RYTM
$7.28B
| $689K | ﹤0.01% |
15,000
+6,300
| +72% | +$199K |
|
3378
Tiptree Inc
TIPT
$678M
| $689K | ﹤0.01% |
36,379
+24,271
| +200% | +$420K |
|
|
ITOS
3379
PUT
DELISTED
iTeos Therapeutics
ITOS
| $688K | ﹤0.01% |
62,900
+20,800
| +49% | +$206K |
|
3380
CALL
Dr. Reddy's Laboratories
RDY
$9.8B
| $688K | ﹤0.01% |
+49,500
| New | +$662K |
|
3381
Coupang
CPNG
$28.6B
| $687K | ﹤0.01% |
42,489
-7,597
| -15% | -$125K |
|
3382
CALL
Western Midstream Partners
WES
$19.3B
| $687K | ﹤0.01% |
23,500
-25,800
| -52% | -$721K |
|
3383
UFP Industries
UFPI
$4.98B
| $686K | ﹤0.01% |
5,464
+5,244
| +2,384% | +$566K |
|
3384
Wyndham Hotels & Resorts
WH
$5.58B
| $686K | ﹤0.01% |
+8,542
| New | +$643K |
|
3385
PUT
Semtech
SMTC
$11.3B
| $685K | ﹤0.01% |
31,300
-37,800
| -55% | -$701K |
|
3386
PUT
Westlake Corp
WLK
$9.27B
| $685K | ﹤0.01% |
4,900
-1,400
| -22% | -$178K |
|
3387
CALL
International Bancshares
IBOC
$4.77B
| $684K | ﹤0.01% |
12,600
-1,300
| -9% | -$60.3K |
|
3388
CALL
MaxLinear
MXL
$5.88B
| $684K | ﹤0.01% |
28,800
+16,400
| +132% | +$321K |
|
3389
CALL
Carbon Collective Climate Solutions US Equity ETF
CCSO
$46.4M
| $682K | ﹤0.01% |
48,500
+28,700
| +145% | +$513K |
|
3390
Guardant Health
GH
$19.3B
| $681K | ﹤0.01% |
25,191
+10,218
| +68% | +$268K |
|
3391
Steris
STE
$21.3B
| $681K | ﹤0.01% |
3,100
+2,738
| +756% | +$579K |
|
3392
PUT
DigitalBridge
DBRG
$2.93B
| $680K | ﹤0.01% |
43,800
-46,000
| -51% | -$757K |
|
3393
CALL
Universal Insurance Holdings
UVE
$1.21B
| $679K | ﹤0.01% |
42,500
+41,400
| +3,764% | +$645K |
|
3394
PUT
Procore
PCOR
$7.03B
| $678K | ﹤0.01% |
9,800
-7,200
| -42% | -$444K |
|
3395
CALL
SoundHound AI
SOUN
$2.79B
| $678K | ﹤0.01% |
320,100
-1,100
| -0.3% | -$2.18K |
|
3396
PUT
Ferguson
FERG
$45.4B
| $675K | ﹤0.01% |
3,500
-3,300
| -49% | -$557K |
|
3397
CALL
MillerKnoll
MLKN
$1.54B
| $675K | ﹤0.01% |
25,300
+12,300
| +95% | +$314K |
|
3398
CALL
Invesco DB Base Metals Fund
DBB
$308M
| $674K | ﹤0.01% |
34,100
-112,600
| -77% | -$2.07M |
|
3399
First Horizon
FHN
$12.1B
| $674K | ﹤0.01% |
47,641
+3,286
| +7% | +$39.6K |
|
3400
Mettler-Toledo International
MTD
$27B
| $674K | ﹤0.01% |
+556
| New | +$601K |
|
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.