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
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 97.5% |
| 2 | Communication Services | 0.5% |
| 3 | Consumer Discretionary | 0.49% |
| 4 | Technology | 0.41% |
| 5 | Financials | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
526
PUT
Domino's
DPZ
$11.3B
| $5.46M | 0.02% |
220
-108
| -33% | -$28.4K |
|
527
PUT
Lennar Class B
LEN.B
$19.8B
| $5.43M | 0.02% |
1,474
+922
| +167% | +$30.3K |
|
528
Bristol-Myers Squibb
BMY
$136B
| $5.42M | 0.02% |
104,321
+41,956
| +67% | +$2.25M |
|
529
PUT
Bread Financial
BFH
$4.26B
| $5.42M | 0.02% |
452
+221
| +96% | +$34.7K |
|
530
CALL
Synopsys
SNPS
$75.5B
| $5.42M | 0.02% |
643
+350
| +119% | +$31.1K |
|
531
CALL
Under Armour Class C
UA
$2.2B
| $5.42M | 0.02% |
3,128
+2,029
| +185% | +$38.4K |
|
532
State Street Materials Select Sector SPDR ETF
XLB
$8.64B
| $5.41M | 0.02% |
214,236
+168,196
| +365% | +$4.49M |
|
533
PUT
Mohawk Industries
MHK
$9.05B
| $5.4M | 0.02% |
462
+309
| +202% | +$41.2K |
|
534
PUT
National Health Investors
NHI
$3.48B
| $5.39M | 0.02% |
714
+541
| +313% | +$40.8K |
|
535
PUT
TripAdvisor
TRIP
$1.09B
| $5.38M | 0.02% |
997
+270
| +37% | +$15K |
|
536
United States Oil Fund
USO
$1.61B
| $5.38M | 0.02% |
+69,554
| New | +$7M |
|
537
CALL
Energy Transfer Partners
ET
$74B
| $5.37M | 0.02% |
4,068
+2,553
| +169% | +$38.8K |
|
538
CALL
Vodafone
VOD
$39.1B
| $5.36M | 0.02% |
2,782
+2,312
| +492% | +$46.2K |
|
539
PUT
PVH
PVH
$3.43B
| $5.34M | 0.02% |
575
+229
| +66% | +$26.2K |
|
|
ALXN
540
PUT
DELISTED
Alexion Pharmaceuticals
ALXN
| $5.32M | 0.02% |
546
+302
| +124% | +$35.7K |
|
541
PUT
CME Group
CME
$101B
| $5.3M | 0.02% |
282
+36
| +15% | +$6.65K |
|
542
CALL
Emerson Electric
EMR
$85.2B
| $5.29M | 0.02% |
886
-25
| -3% | -$1.69K |
|
543
CALL
Howmet Aerospace
HWM
$103B
| $5.28M | 0.02% |
4,109
+3,684
| +867% | +$57.6K |
|
544
PUT
Fortinet
FTNT
$115B
| $5.28M | 0.02% |
3,745
+25
| +0.7% | +$381 |
|
545
CALL
Intercontinental Exchange
ICE
$90.5B
| $5.26M | 0.02% |
699
+274
| +64% | +$21K |
|
546
CALL
Paychex
PAYX
$43.3B
| $5.26M | 0.02% |
808
-287
| -26% | -$19.4K |
|
547
CALL
Archer Daniels Midland
ADM
$40.8B
| $5.26M | 0.02% |
1,283
+947
| +282% | +$44.1K |
|
548
CALL
iShares Silver Trust
SLV
$32.2B
| $5.25M | 0.02% |
3,619
+2,873
| +385% | +$39.3K |
|
549
PUT
Etsy
ETSY
$7.02B
| $5.25M | 0.02% |
1,104
+806
| +270% | +$37.9K |
|
550
PUT
Old Dominion Freight Line
ODFL
$38.5B
| $5.25M | 0.02% |
1,275
-174
| -12% | -$7.71K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,572 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, up from 95% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,572 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.