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 | |
|---|---|---|---|---|---|---|
376
PUT
DoorDash
DASH
$77.4B
| $38.4M | 0.02% |
269,100
-107,700
| -29% | -$13.1M |
|
377
Arm
ARM
$303B
| $38.3M | 0.02% |
267,749
+122,552
| +84% | +$17.4M |
|
378
PUT
Thermo Fisher Scientific
TMO
$196B
| $38.1M | 0.02% |
61,600
-23,800
| -28% | -$14.1M |
|
379
PUT
Invesco Aerospace & Defense ETF
PPA
$8.03B
| $38.1M | 0.02% |
216,800
-138,500
| -39% | -$15.1M |
|
380
PUT
Roku
ROKU
$21.2B
| $38M | 0.02% |
509,000
+22,900
| +5% | +$1.47M |
|
381
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$153B
| $37.7M | 0.02% |
610,300
+201,500
| +49% | +$10.9M |
|
382
PUT
Wingstop
WING
$3.76B
| $37.4M | 0.02% |
89,800
-20,400
| -19% | -$7.93M |
|
383
CALL
Zillow
Z
$7.18B
| $37.2M | 0.02% |
583,300
+89,700
| +18% | +$4.82M |
|
384
CALL
Hershey
HSY
$35B
| $37.2M | 0.02% |
193,800
+30,500
| +19% | +$5.93M |
|
385
CALL
On Holding
ONON
$12.2B
| $37.1M | 0.02% |
740,200
-396,600
| -35% | -$17M |
|
386
CALL
NXP Semiconductors
NXPI
$70.4B
| $37.1M | 0.02% |
154,600
-35,700
| -19% | -$8.95M |
|
387
CALL
Blackrock
BLK
$164B
| $36.9M | 0.02% |
38,900
+600
| +2% | +$519K |
|
388
CALL
Ford
F
$57.5B
| $36.9M | 0.02% |
3,496,200
+579,200
| +20% | +$6.63M |
|
389
CALL
Enphase Energy
ENPH
$5.22B
| $36.7M | 0.02% |
324,900
-85,000
| -21% | -$9.5M |
|
390
PUT
Southwest Airlines
LUV
$23.3B
| $36.7M | 0.02% |
1,237,200
-216,800
| -15% | -$6M |
|
391
PUT
Abercrombie & Fitch
ANF
$4.27B
| $36.6M | 0.02% |
261,500
-185,300
| -41% | -$28.2M |
|
392
Intel
INTC
$516B
| $36.6M | 0.02% |
1,558,236
-1,241,514
| -44% | -$31M |
|
393
CALL
HubSpot
HUBS
$10.5B
| $36.4M | 0.02% |
68,500
-47,100
| -41% | -$23.7M |
|
394
CALL
Viking Therapeutics
VKTX
$4.33B
| $36.3M | 0.02% |
573,700
+96,300
| +20% | +$5.65M |
|
|
395
CALL
Thermo Fisher Scientific
TMO
$196B
| $36.3M | 0.02% |
58,700
+3,300
| +6% | +$1.95M |
|
396
PUT
Lockheed Martin
LMT
$119B
| $36.2M | 0.02% |
62,000
-91,200
| -60% | -$49M |
|
397
CALL
EOG Resources
EOG
$76.7B
| $36.2M | 0.02% |
294,700
-5,600
| -2% | -$703K |
|
398
CALL
SoFi Technologies
SOFI
$21.9B
| $36.2M | 0.02% |
4,608,900
-614,400
| -12% | -$4.47M |
|
399
PUT
Celsius Holdings
CELH
$7.28B
| $36.2M | 0.02% |
1,153,700
+468,900
| +68% | +$19.7M |
|
400
PUT
Synopsys
SNPS
$72.3B
| $36.2M | 0.02% |
71,400
-4,000
| -5% | -$2.15M |
|
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.