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 | |
|---|---|---|---|---|---|---|
1476
CALL
Symbotic
SYM
$5.11B
| $5.09M | ﹤0.01% |
208,800
+80,300
| +62% | +$2.18M |
|
1477
CALL
Penumbra
PEN
$12.5B
| $5.09M | ﹤0.01% |
26,200
-1,000
| -4% | -$189K |
|
|
GTM
1478
CALL
ZoomInfo Technologies
GTM
$861M
| $5.08M | ﹤0.01% |
492,000
-375,300
| -43% | -$3.93M |
|
1479
CALL
M&T Bank
MTB
$36.2B
| $5.08M | ﹤0.01% |
28,500
-29,600
| -51% | -$4.91M |
|
|
PPL
1480
PUT
PPL Corp
PPL
$27.3B
| $5.07M | ﹤0.01% |
153,300
+138,300
| +922% | +$4.23M |
|
1481
CALL
Shift4
FOUR
$3.84B
| $5.07M | ﹤0.01% |
57,200
-128,400
| -69% | -$9.73M |
|
1482
CALL
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $5.06M | ﹤0.01% |
72,800
-99,500
| -58% | -$5.83M |
|
1483
CALL
Vipshop
VIPS
$6.84B
| $5.04M | ﹤0.01% |
320,700
+164,100
| +105% | +$2.2M |
|
1484
CALL
L3Harris
LHX
$55.9B
| $5.04M | ﹤0.01% |
21,200
-16,600
| -44% | -$3.83M |
|
1485
CALL
DigitalOcean
DOCN
$14.4B
| $5.03M | ﹤0.01% |
124,600
-248,800
| -67% | -$8.87M |
|
1486
CALL
Qorvo
QRVO
$7.63B
| $5.03M | ﹤0.01% |
48,700
-42,400
| -47% | -$4.76M |
|
1487
CALL
Boot Barn
BOOT
$4.55B
| $5.02M | ﹤0.01% |
30,000
-39,300
| -57% | -$5.4M |
|
1488
Gilead Sciences
GILD
$161B
| $5.02M | ﹤0.01% |
59,853
-92,589
| -61% | -$7.06M |
|
1489
Nice
NICE
$5.29B
| $5M | ﹤0.01% |
+28,812
| New | +$4.95M |
|
1490
CALL
Thor Industries
THO
$3.99B
| $5M | ﹤0.01% |
45,500
+14,000
| +44% | +$1.42M |
|
1491
CALL
Monolithic Power Systems
MPWR
$65.5B
| $4.99M | ﹤0.01% |
5,400
-3,200
| -37% | -$2.76M |
|
1492
Salesforce
CRM
$134B
| $4.99M | ﹤0.01% |
+18,218
| New | +$4.67M |
|
|
ALTR
1493
PUT
DELISTED
Altair Engineering Inc
ALTR
| $4.99M | ﹤0.01% |
52,200
+27,300
| +110% | +$2.48M |
|
1494
PUT
Boyd Gaming
BYD
$6.47B
| $4.98M | ﹤0.01% |
77,000
-167,300
| -68% | -$9.87M |
|
1495
PUT
Robert Half
RHI
$3.61B
| $4.97M | ﹤0.01% |
73,700
+65,600
| +810% | +$4.16M |
|
1496
CALL
Deutsche Bank
DB
$66.3B
| $4.96M | ﹤0.01% |
286,600
+61,200
| +27% | +$983K |
|
1497
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$712M
| $4.94M | ﹤0.01% |
92,800
+28,300
| +44% | +$1.22M |
|
1498
PUT
Rockwell Automation
ROK
$51.4B
| $4.94M | ﹤0.01% |
18,400
-19,800
| -52% | -$5.26M |
|
1499
CALL
TG Therapeutics
TGTX
$8.58B
| $4.94M | ﹤0.01% |
211,100
+13,000
| +7% | +$284K |
|
|
SGI
1500
PUT
Somnigroup International
SGI
$15.1B
| $4.9M | ﹤0.01% |
89,700
-178,400
| -67% | -$9.07M |
|
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.