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 | |
|---|---|---|---|---|---|---|
1451
PUT
Dynatrace
DT
$12.1B
| $5.75M | ﹤0.01% |
105,200
+11,900
| +13% | +$601K |
|
1452
CALL
Paychex
PAYX
$40.4B
| $5.74M | ﹤0.01% |
48,200
-11,900
| -20% | -$1.41M |
|
1453
CALL
Virgin Galactic
SPCE
$320M
| $5.71M | ﹤0.01% |
116,480
+5,275
| +5% | +$208K |
|
1454
CALL
TG Therapeutics
TGTX
$8.58B
| $5.71M | ﹤0.01% |
334,100
+22,600
| +7% | +$263K |
|
1455
PUT
Avantor
AVTR
$7.81B
| $5.71M | ﹤0.01% |
249,900
+118,900
| +91% | +$2.44M |
|
1456
PUT
AngloGold Ashanti
AU
$40.3B
| $5.7M | ﹤0.01% |
304,900
+257,900
| +549% | +$4.65M |
|
1457
CALL
McCormick & Company Non-Voting
MKC
$13.4B
| $5.68M | ﹤0.01% |
83,100
+73,300
| +748% | +$4.8M |
|
1458
CALL
QuidelOrtho
QDEL
$1.09B
| $5.67M | ﹤0.01% |
77,000
+25,200
| +49% | +$1.7M |
|
1459
CALL
Stanley Black & Decker
SWK
$14.2B
| $5.67M | ﹤0.01% |
57,800
+200
| +0.3% | +$17.6K |
|
|
P
1460
Everpure Inc
P
$24.8B
| $5.65M | ﹤0.01% |
158,569
+146,432
| +1,206% | +$5.13M |
|
1461
PUT
Costamare
CMRE
$1.9B
| $5.64M | ﹤0.01% |
541,500
+267,700
| +98% | +$2.55M |
|
1462
CALL
UFP Industries
UFPI
$4.97B
| $5.62M | ﹤0.01% |
44,800
+41,500
| +1,258% | +$4.48M |
|
1463
CALL
TFI International
TFII
$12.4B
| $5.59M | ﹤0.01% |
41,100
+40,300
| +5,038% | +$4.78M |
|
1464
CALL
RBC Bearings
RBC
$18.8B
| $5.58M | ﹤0.01% |
19,600
-500
| -2% | -$123K |
|
1465
Danaher
DHR
$135B
| $5.58M | ﹤0.01% |
24,112
-5,385
| -18% | -$1.15M |
|
1466
PUT
Aon
AON
$77.3B
| $5.56M | ﹤0.01% |
19,100
-2,300
| -11% | -$736K |
|
1467
PUT
STMicroelectronics
STM
$46B
| $5.54M | ﹤0.01% |
110,500
-5,200
| -4% | -$233K |
|
1468
CALL
Toro Company
TTC
$8.93B
| $5.53M | ﹤0.01% |
57,600
+3,300
| +6% | +$283K |
|
1469
CALL
Ametek
AME
$55.5B
| $5.52M | ﹤0.01% |
33,500
+22,600
| +207% | +$3.45M |
|
1470
PUT
Zoetis
ZTS
$31.6B
| $5.51M | ﹤0.01% |
27,900
-13,300
| -32% | -$2.35M |
|
1471
PUT
MPLX
MPLX
$59.5B
| $5.5M | ﹤0.01% |
149,900
+200
| +0.1% | +$7.19K |
|
|
OSG
1472
Octave Specialty Group
OSG
$252M
| $5.49M | ﹤0.01% |
333,361
+319,769
| +2,353% | +$4.45M |
|
1473
CALL
Pinnacle Financial Partners Inc
PNFP
$15.5B
| $5.48M | ﹤0.01% |
62,800
+54,400
| +648% | +$3.94M |
|
1474
PUT
Xenon Pharmaceuticals
XENE
$6.32B
| $5.47M | ﹤0.01% |
118,700
+77,400
| +187% | +$2.73M |
|
1475
PUT
Baxter International
BAX
$11.6B
| $5.46M | ﹤0.01% |
141,300
-29,300
| -17% | -$1.04M |
|
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.