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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3476
PUT
Gentex
GNTX
$5.12B
| $711K | ﹤0.01% |
19,700
+19,500
| +9,750% | +$675K |
|
|
SAGE
3477
DELISTED
Sage Therapeutics
SAGE
| $711K | ﹤0.01% |
37,954
+30,499
| +409% | +$703K |
|
3478
FS KKR Capital
FSK
$3.08B
| $710K | ﹤0.01% |
+37,266
| New | +$737K |
|
3479
iShares Biotechnology ETF
IBB
$9.55B
| $709K | ﹤0.01% |
+5,172
| New | +$706K |
|
3480
Paysafe
PSFE
$463M
| $709K | ﹤0.01% |
+44,915
| New | +$628K |
|
3481
CALL
Insmed
INSM
$22.6B
| $708K | ﹤0.01% |
26,100
-11,000
| -30% | -$308K |
|
3482
CALL
LendingTree
TREE
$572M
| $707K | ﹤0.01% |
16,700
-32,100
| -66% | -$1.12M |
|
3483
CALL
Arcutis Biotherapeutics
ARQT
$3.55B
| $706K | ﹤0.01% |
71,300
+62,100
| +675% | +$463K |
|
3484
PUT
TPG
TPG
$7.02B
| $706K | ﹤0.01% |
15,800
+12,300
| +351% | +$527K |
|
3485
Essex Property Trust
ESS
$18.9B
| $705K | ﹤0.01% |
+2,882
| New | +$686K |
|
3486
PUT
Loews
L
$24.6B
| $704K | ﹤0.01% |
9,000
+8,500
| +1,700% | +$628K |
|
3487
CALL
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.37B
| $704K | ﹤0.01% |
12,400
+1,700
| +16% | +$83.5K |
|
3488
PUT
Geron
GERN
$930M
| $703K | ﹤0.01% |
213,300
+116,200
| +120% | +$260K |
|
3489
CALL
Vanguard Total Bond Market
BND
$158B
| $702K | ﹤0.01% |
9,500
-2,300
| -19% | -$167K |
|
3490
PUT
indie Semiconductor
INDI
$678M
| $701K | ﹤0.01% |
99,100
+89,900
| +977% | +$609K |
|
3491
CALL
US Foods
USFD
$22.3B
| $701K | ﹤0.01% |
13,000
-3,800
| -23% | -$187K |
|
3492
CALL
Flywire
FLYW
$2.04B
| $699K | ﹤0.01% |
28,200
+16,300
| +137% | +$381K |
|
3493
CALL
LivaNova
LIVN
$4.51B
| $699K | ﹤0.01% |
12,500
+7,500
| +150% | +$390K |
|
3494
CALL
Urban Outfitters
URBN
$6.44B
| $699K | ﹤0.01% |
16,100
-101,900
| -86% | -$4.18M |
|
3495
Wolverine World Wide
WWW
$1.71B
| $699K | ﹤0.01% |
62,383
+17,234
| +38% | +$160K |
|
3496
3D Systems Corp
DDD
$412M
| $698K | ﹤0.01% |
157,372
+142,249
| +941% | +$700K |
|
|
CDMO
3497
CALL
DELISTED
Avid Bioservices, Inc. Common Stock
CDMO
| $698K | ﹤0.01% |
104,300
+99,200
| +1,945% | +$682K |
|
3498
CALL
Larimar Therapeutics
LRMR
$398M
| $696K | ﹤0.01% |
91,800
+88,300
| +2,523% | +$688K |
|
3499
PUT
RCI Hospitality Holdings
RICK
$203M
| $696K | ﹤0.01% |
12,000
-5,900
| -33% | -$347K |
|
3500
PUT
Petco
WOOF
$811M
| $696K | ﹤0.01% |
305,600
+277,900
| +1,003% | +$705K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.