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 | |
|---|---|---|---|---|---|---|
3251
CALL
Woodward
WWD
$24.8B
| $703K | ﹤0.01% |
4,100
+2,900
| +242% | +$483K |
|
3252
Tidewater
TDW
$3.94B
| $702K | ﹤0.01% |
9,784
+5,188
| +113% | +$452K |
|
3253
Tower Semiconductor
TSEM
$24.8B
| $702K | ﹤0.01% |
15,863
-80,244
| -83% | -$3.29M |
|
3254
CALL
Kanzhun
BZ
$6.99B
| $701K | ﹤0.01% |
40,400
-61,600
| -60% | -$896K |
|
|
DVAX
3255
CALL
DELISTED
Dynavax Technologies
DVAX
| $701K | ﹤0.01% |
63,000
-7,500
| -11% | -$82.7K |
|
3256
Amphenol
APH
$183B
| $698K | ﹤0.01% |
10,719
-37,377
| -78% | -$2.42M |
|
3257
Insight Enterprises
NSIT
$3.69B
| $698K | ﹤0.01% |
+3,244
| New | +$668K |
|
3258
Iridium Communications
IRDM
$4.85B
| $697K | ﹤0.01% |
+22,903
| New | +$624K |
|
3259
CALL
Intellia Therapeutics
NTLA
$1.51B
| $696K | ﹤0.01% |
33,900
-37,200
| -52% | -$858K |
|
3260
Planet Fitness
PLNT
$4.31B
| $695K | ﹤0.01% |
8,563
-21,654
| -72% | -$1.7M |
|
3261
CALL
Boston Beer
SAM
$1.93B
| $693K | ﹤0.01% |
2,400
-2,100
| -47% | -$586K |
|
3262
Genius Sports
GENI
$1.97B
| $692K | ﹤0.01% |
88,302
+3,896
| +5% | +$27.1K |
|
3263
PUT
OneWater Marine
ONEW
$223M
| $690K | ﹤0.01% |
28,900
-28,500
| -50% | -$700K |
|
3264
State Street SPDR S&P Metals & Mining ETF
XME
$3.92B
| $690K | ﹤0.01% |
+10,844
| New | +$649K |
|
3265
Teladoc Health
TDOC
$1.59B
| $689K | ﹤0.01% |
+75,056
| New | +$621K |
|
|
QLTB
3266
CALL
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $688K | ﹤0.01% |
5,600
-2,700
| -33% | -$332K |
|
3267
Direxion Daily Junior Gold Miners Index Bull 2X ETF
JNUG
$372M
| $687K | ﹤0.01% |
14,567
-54,344
| -79% | -$2.35M |
|
3268
PUT
ImmunityBio
IBRX
$7.29B
| $686K | ﹤0.01% |
184,600
-74,300
| -29% | -$344K |
|
3269
CALL
Bentley Systems
BSY
$10.2B
| $685K | ﹤0.01% |
13,500
+6,900
| +105% | +$340K |
|
3270
CALL
Phinia Inc
PHIN
$2.87B
| $685K | ﹤0.01% |
14,900
+11,600
| +352% | +$522K |
|
3271
Krispy Kreme
DNUT
$560M
| $684K | ﹤0.01% |
63,774
+27,423
| +75% | +$298K |
|
3272
CALL
Life Time Group Holdings
LTH
$9.64B
| $683K | ﹤0.01% |
28,000
-4,500
| -14% | -$101K |
|
3273
Vivid Seats
SEAT
$82.7M
| $682K | ﹤0.01% |
9,226
+3,566
| +63% | +$325K |
|
3274
CALL
LoveSac
LOVE
$249M
| $681K | ﹤0.01% |
23,800
+6,700
| +39% | +$167K |
|
3275
PUT
XP
XP
$8.62B
| $681K | ﹤0.01% |
38,000
+1,100
| +3% | +$20.1K |
|
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.