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 | |
|---|---|---|---|---|---|---|
226
CALL
3M
MMM
$89.1B
| $71.5M | 0.04% |
883,100
+36,700
| +4% | +$4.49M |
|
227
CALL
Mercado Libre
MELI
$91.2B
| $71M | 0.04% |
34,600
+14,700
| +74% | +$27.7M |
|
228
PUT
Lowe's Companies
LOW
$115B
| $70.6M | 0.04% |
364,800
+79,100
| +28% | +$19.2M |
|
|
X
229
PUT
DELISTED
US Steel
X
| $69.8M | 0.04% |
1,975,800
+1,656,000
| +518% | +$63M |
|
|
X
230
CALL
DELISTED
US Steel
X
| $69.7M | 0.04% |
1,973,200
+1,468,400
| +291% | +$55.9M |
|
|
SCHW
231
PUT
Charles Schwab
SCHW
$175B
| $68.8M | 0.04% |
1,061,200
+188,200
| +22% | +$12.4M |
|
232
CALL
Sea Limited
SE
$64.2B
| $68.5M | 0.04% |
726,800
-119,000
| -14% | -$8.98M |
|
233
CALL
Amgen
AMGN
$198B
| $68.5M | 0.04% |
212,600
+9,300
| +5% | +$3.04M |
|
234
PUT
Wynn Resorts
WYNN
$9.79B
| $68.3M | 0.04% |
712,100
+204,900
| +40% | +$16.5M |
|
235
CALL
DraftKings
DKNG
$11.3B
| $68.2M | 0.04% |
1,738,800
-411,100
| -19% | -$14.8M |
|
236
PUT
Moderna
MRNA
$23B
| $68.1M | 0.04% |
1,019,500
+354,600
| +53% | +$32.6M |
|
237
PUT
Marvell Technology
MRVL
$189B
| $68M | 0.04% |
942,500
-579,400
| -38% | -$40M |
|
238
PUT
American Express
AXP
$238B
| $67.5M | 0.04% |
248,900
+4,400
| +2% | +$1.1M |
|
239
CALL
Lam Research
LRCX
$399B
| $67.2M | 0.04% |
824,000
+256,000
| +45% | +$22.3M |
|
240
PUT
Intuitive Surgical
ISRG
$121B
| $67M | 0.04% |
136,400
+26,100
| +24% | +$12.2M |
|
241
PUT
S&P Global
SPGI
$127B
| $66.7M | 0.04% |
129,100
+89,300
| +224% | +$44.2M |
|
242
PUT
United Parcel Service
UPS
$98.5B
| $65.8M | 0.04% |
482,300
+82,600
| +21% | +$10.8M |
|
243
PUT
Las Vegas Sands
LVS
$30B
| $65.5M | 0.04% |
1,302,000
+715,900
| +122% | +$29.3M |
|
244
CALL
Union Pacific
UNP
$174B
| $65.4M | 0.04% |
265,300
-25,600
| -9% | -$6.21M |
|
245
PUT
American Airlines Group
AAL
$9.78B
| $65.2M | 0.04% |
5,799,200
-1,154,400
| -17% | -$12.2M |
|
246
CALL
Procter & Gamble
PG
$347B
| $64.6M | 0.04% |
372,800
-117,600
| -24% | -$20M |
|
|
247
PUT
Amgen
AMGN
$198B
| $64.5M | 0.04% |
236,800
+8,100
| +4% | +$2.65M |
|
|
248
CALL
United Parcel Service
UPS
$98.5B
| $64.1M | 0.04% |
470,200
-54,900
| -10% | -$7.21M |
|
249
PUT
Lennar Class A
LEN
$19.8B
| $64.1M | 0.04% |
353,183
+59,088
| +20% | +$9.9M |
|
250
CALL
Progressive
PGR
$119B
| $64.1M | 0.04% |
252,500
-9,900
| -4% | -$2.3M |
|
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.