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 | |
|---|---|---|---|---|---|---|
401
PUT
United Rentals
URI
$64.8B
| $35.9M | 0.02% |
44,300
-93,100
| -68% | -$67M |
|
402
CALL
Zscaler
ZS
$23B
| $35.7M | 0.02% |
208,900
-109,400
| -34% | -$20M |
|
403
CALL
Pinterest
PINS
$12.6B
| $35.7M | 0.02% |
1,101,900
+8,000
| +0.7% | +$272K |
|
404
PUT
Snap
SNAP
$7.52B
| $35.6M | 0.02% |
3,331,400
+884,100
| +36% | +$10.1M |
|
|
405
CALL
Snap
SNAP
$7.52B
| $35.6M | 0.02% |
3,326,200
+458,500
| +16% | +$5.23M |
|
406
CALL
Trade Desk
TTD
$8.26B
| $35.3M | 0.02% |
321,900
-23,900
| -7% | -$2.38M |
|
407
Booking.com
BKNG
$138B
| $35.3M | 0.02% |
209,400
+118,450
| +130% | +$18.2M |
|
408
CALL
Take-Two Interactive
TTWO
$43.4B
| $35.1M | 0.02% |
228,400
-10,300
| -4% | -$1.56M |
|
409
CALL
Coherent
COHR
$61.1B
| $34.9M | 0.02% |
392,500
+209,500
| +114% | +$15.7M |
|
410
CALL
Fortinet
FTNT
$114B
| $34.9M | 0.02% |
449,800
+32,500
| +8% | +$2.22M |
|
411
CALL
Roku
ROKU
$21.2B
| $34.8M | 0.02% |
466,500
-41,000
| -8% | -$2.63M |
|
412
CALL
Microchip Technology
MCHP
$46.2B
| $34.7M | 0.02% |
432,200
+45,100
| +12% | +$3.72M |
|
|
413
PUT
Take-Two Interactive
TTWO
$43.4B
| $34.6M | 0.02% |
225,200
+45,800
| +26% | +$6.95M |
|
414
CALL
Vanguard Consumer Discretionary ETF
VCR
$6.07B
| $34.5M | 0.02% |
82,900
+20,400
| +33% | +$6.51M |
|
415
CALL
General Dynamics
GD
$101B
| $34.5M | 0.02% |
114,100
+21,500
| +23% | +$6.32M |
|
416
PUT
Capital One
COF
$124B
| $34.4M | 0.02% |
229,900
+28,400
| +14% | +$4.04M |
|
417
PUT
3M
MMM
$89.1B
| $34.4M | 0.02% |
384,100
+119,700
| +45% | +$14.7M |
|
418
PUT
Devon Energy
DVN
$51.8B
| $34.4M | 0.02% |
878,800
-291,200
| -25% | -$12.8M |
|
419
PUT
Cameco
CCJ
$39.4B
| $34.3M | 0.02% |
718,000
-106,900
| -13% | -$4.66M |
|
420
PUT
Valero Energy
VLO
$92.3B
| $34.2M | 0.02% |
253,500
+10,700
| +4% | +$1.55M |
|
421
CALL
Gilead Sciences
GILD
$162B
| $34.2M | 0.02% |
408,100
-113,400
| -22% | -$8.65M |
|
422
CALL
RH
RH
$3.31B
| $34.2M | 0.02% |
102,200
-42,700
| -29% | -$11.8M |
|
|
423
PUT
Trade Desk
TTD
$8.26B
| $34.1M | 0.02% |
310,600
-84,400
| -21% | -$8.42M |
|
424
CALL
SLB Ltd
SLB
$71.3B
| $34M | 0.02% |
850,600
+29,400
| +4% | +$1.31M |
|
425
PUT
Roblox
RBLX
$35.5B
| $34M | 0.02% |
768,600
+251,100
| +49% | +$10.5M |
|
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.