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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1551
CALL
SoundHound AI
SOUN
$2.68B
| $4.62M | ﹤0.01% |
992,300
-25,100
| -2% | -$121K |
|
1552
PUT
YPF
YPF
$20.2B
| $4.61M | ﹤0.01% |
217,500
+18,500
| +9% | +$394K |
|
1553
CALL
GlobalFoundries
GFS
$29.4B
| $4.61M | ﹤0.01% |
114,600
-53,500
| -32% | -$2.48M |
|
1554
CALL
Liberty Global Class C
LBTYK
$3.25B
| $4.61M | ﹤0.01% |
218,400
+6,100
| +3% | +$120K |
|
1555
CALL
JPMorgan Inflation Managed Bond ETF
JCPI
$865M
| $4.61M | ﹤0.01% |
83,900
+29,200
| +53% | +$1.38M |
|
1556
CALL
Ferguson
FERG
$44.7B
| $4.61M | ﹤0.01% |
23,200
-1,300
| -5% | -$263K |
|
1557
CALL
FIVE9
FIVN
$1.77B
| $4.61M | ﹤0.01% |
160,300
+33,500
| +26% | +$1.21M |
|
1558
PUT
Ventas
VTR
$48.9B
| $4.57M | ﹤0.01% |
71,200
+10,700
| +18% | +$625K |
|
1559
CALL
ProShares UltraShort Health Care
RXD
$3.25M
| $4.56M | ﹤0.01% |
88,450
-21,350
| -19% | -$419K |
|
1560
CALL
Sprouts Farmers Market
SFM
$7.04B
| $4.56M | ﹤0.01% |
41,300
-35,700
| -46% | -$3.4M |
|
1561
CALL
Ollie's Bargain Outlet
OLLI
$4.01B
| $4.56M | ﹤0.01% |
46,900
+12,100
| +35% | +$1.17M |
|
1562
CALL
Voya Financial
VOYA
$8.94B
| $4.54M | ﹤0.01% |
57,300
+48,700
| +566% | +$3.48M |
|
1563
PUT
Texas Roadhouse
TXRH
$12.7B
| $4.54M | ﹤0.01% |
25,700
+16,100
| +168% | +$2.72M |
|
1564
CALL
Labcorp
LH
$24.3B
| $4.54M | ﹤0.01% |
20,300
-3,200
| -14% | -$703K |
|
1565
CALL
Celldex Therapeutics
CLDX
$2.77B
| $4.52M | ﹤0.01% |
133,100
+125,200
| +1,585% | +$4.77M |
|
1566
CALL
Axsome Therapeutics
AXSM
$12.4B
| $4.52M | ﹤0.01% |
50,300
+4,000
| +9% | +$349K |
|
1567
PUT
US Foods
USFD
$21.4B
| $4.52M | ﹤0.01% |
73,500
-42,400
| -37% | -$2.37M |
|
1568
CALL
United States Oil Fund
USO
$2.45B
| $4.52M | ﹤0.01% |
64,600
-36,400
| -36% | -$2.73M |
|
1569
PUT
KE Holdings
BEKE
$16.8B
| $4.51M | ﹤0.01% |
226,700
+39,300
| +21% | +$580K |
|
1570
CALL
Olin
OLN
$2.64B
| $4.51M | ﹤0.01% |
94,000
+57,000
| +154% | +$2.54M |
|
1571
Global Payments
GPN
$22.1B
| $4.5M | ﹤0.01% |
43,945
-9,208
| -17% | -$956K |
|
1572
CALL
Avis
CAR
$5.63B
| $4.49M | ﹤0.01% |
51,300
-13,500
| -21% | -$1.22M |
|
1573
PUT
Doximity
DOCS
$3.67B
| $4.49M | ﹤0.01% |
103,000
+13,700
| +15% | +$457K |
|
1574
PUT
AvalonBay Communities
AVB
$27.1B
| $4.48M | ﹤0.01% |
19,900
-4,200
| -17% | -$907K |
|
1575
CALL
Nasdaq
NDAQ
$52.1B
| $4.47M | ﹤0.01% |
61,300
+27,100
| +79% | +$1.85M |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.