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 |
iShares Russell 2000 ETF
IWM
|
+$29.8M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$17.1M |
| 3 |
Walt Disney
DIS
|
+$14.8M |
| 4 |
Gilead Sciences
GILD
|
+$11.8M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$11.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$92.9M |
| 2 |
Apple
AAPL
|
+$22.5M |
| 3 |
Meta Platforms (Facebook)
META
|
+$20.5M |
| 4 |
IBM
IBM
|
+$12.7M |
| 5 |
Baidu
BIDU
|
+$10M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Healthcare | 6.46% |
| 2 | Communication Services | 4.66% |
| 3 | Consumer Discretionary | 4.6% |
| 4 | Technology | 4.57% |
| 5 | Financials | 4.49% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
476
United Rentals
URI
$64.8B
| $461K | 0.03% |
7,688
-5,328
| -41% | -$370K |
|
|
ALXN
477
PUT
DELISTED
Alexion Pharmaceuticals
ALXN
| $461K | 0.03% |
618
-268
| -30% | -$48.9K |
|
478
Conagra Brands
CAG
$7.1B
| $458K | 0.03% |
14,559
+8,305
| +133% | +$279K |
|
479
CALL
Johnson & Johnson
JNJ
$615B
| $457K | 0.03% |
2,169
+1,524
| +236% | +$147K |
|
480
Cooper Companies
COO
$13.7B
| $455K | 0.03% |
+12,252
| New | +$508K |
|
481
Heron Therapeutics
HRTX
$88.5M
| $455K | 0.03% |
18,652
+16,552
| +788% | +$552K |
|
482
iShares US Home Construction ETF
ITB
$2.37B
| $455K | 0.03% |
+17,450
| New | +$485K |
|
483
PUT
Whirlpool
WHR
$2.41B
| $455K | 0.03% |
350
-266
| -43% | -$45K |
|
484
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.14B
| $455K | 0.03% |
6,037
+2,469
| +69% | +$126K |
|
485
Raymond James Financial
RJF
$32.7B
| $454K | 0.03% |
+13,727
| New | +$509K |
|
486
PUT
GE Aerospace
GE
$354B
| $450K | 0.03% |
384
+149
| +63% | +$18.3K |
|
487
Marriott International
MAR
$97.5B
| $449K | 0.03% |
6,596
+5,606
| +566% | +$405K |
|
488
PUT
3M
MMM
$89.1B
| $449K | 0.03% |
1,689
+846
| +100% | +$104K |
|
489
Danaher
DHR
$127B
| $448K | 0.03% |
+7,823
| New | +$462K |
|
490
Packaging Corp of America
PKG
$20.3B
| $447K | 0.03% |
7,432
+1,662
| +29% | +$111K |
|
|
RDS.A
491
PUT
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $446K | 0.03% |
529
-747
| -59% | -$40K |
|
492
iShares Core S&P Mid-Cap ETF
IJH
$123B
| $443K | 0.03% |
+16,245
| New | +$472K |
|
493
Teradata
TDC
$2.64B
| $442K | 0.03% |
15,273
+5,516
| +57% | +$177K |
|
494
Terex
TEX
$7.66B
| $441K | 0.03% |
+24,629
| New | +$537K |
|
495
PUT
HCA Healthcare
HCA
$82.5B
| $440K | 0.03% |
1,158
-177
| -13% | -$15.7K |
|
496
CALL
Union Pacific
UNP
$174B
| $439K | 0.03% |
1,611
+463
| +40% | +$42.3K |
|
497
PUT
PayPal
PYPL
$49B
| $437K | 0.03% |
+1,150
| New | +$41.2K |
|
498
Motorola Solutions
MSI
$67.1B
| $436K | 0.03% |
6,379
+5,202
| +442% | +$328K |
|
|
NS
499
DELISTED
NuStar Energy L.P.
NS
| $436K | 0.03% |
9,743
+9,642
| +9,547% | +$510K |
|
500
PUT
Philip Morris
PM
$303B
| $435K | 0.03% |
731
-116
| -14% | -$9.55K |
|
Similar funds
Simplex Trading's Q3 2015 Portfolio in Review
As of Q3 2015, Simplex Trading held 7,014 positions worth $1.36B, up 14% from $1.19B the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q3 2015 filing shows 1,810 new, 2,203 increased, 1,391 reduced and 1,420 closed positions. Its largest new stake was iShares Russell 2000 ETF: 251,486 shares worth $27.5M. The largest sale was Alphabet (Google) Class C, an estimated $92.9M.
By sector, the portfolio is most concentrated in Healthcare at 6.5% of assets, down from 7.8% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q3 2015 buy was iShares Russell 2000 ETF: 251,486 shares worth $27.5M.
- Simplex Trading added most to iShares MSCI Emerging Markets ETF in Q3 2015, an estimated $11.2M increase.
- Simplex Trading's biggest Q3 2015 reduction was Alphabet (Google) Class C, cutting an estimated $92.9M.
- Simplex Trading fully exited IBM in Q3 2015, selling an estimated $12.7M.
- Simplex Trading's ten largest holdings make up 15% of its $1.36B portfolio in Q3 2015.
- Simplex Trading opened 1,810 new positions and closed 1,420 in Q3 2015.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $1.36B.
Based on Simplex Trading's 13F filing for Q3 2015, filed 8 Oct 2015.