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 |
Alphabet (Google) Class C
GOOG
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
MEG
776
DELISTED
Media General, Inc
MEG
| $178K | 0.02% |
+10,839
| New | +$169K |
|
|
DRC
777
DELISTED
DRESSER-RAND GROUP INC
DRC
| $177K | 0.02% |
2,208
-5,061
| -70% | -$410K |
|
|
CAVM
778
CALL
DELISTED
Cavium, Inc.
CAVM
| $177K | 0.02% |
70
+47
| +204% | +$3.05K |
|
779
CALL
Medtronic
MDT
$105B
| $176K | 0.02% |
650
-39
| -6% | -$2.96K |
|
|
LITS
780
PUT
Lite Strategy Inc
LITS
$33.7M
| $176K | 0.02% |
46
+45
| +4,500% | +$4.03K |
|
|
CBI
781
CALL
DELISTED
Chicago Bridge & Iron Nv
CBI
| $176K | 0.02% |
547
-213
| -28% | -$8.96K |
|
|
ARP
782
DELISTED
ATLAS RESOURCE PARTNERS L P COM UIT REPSTG LTD PTNRS
ARP
| $176K | 0.02% |
22,949
+21,820
| +1,933% | +$201K |
|
783
Dillards
DDS
$8.76B
| $175K | 0.02% |
1,286
-88
| -6% | -$11K |
|
784
CALL
First Solar
FSLR
$22.1B
| $175K | 0.02% |
315
-1,181
| -79% | -$60.6K |
|
785
ProShares Ultra Energy
DIG
$70.4M
| $174K | 0.02% |
2,749
+2,307
| +522% | +$148K |
|
786
Plains All American Pipeline
PAA
$17.4B
| $174K | 0.02% |
3,572
+2,606
| +270% | +$129K |
|
787
PUT
Sarepta Therapeutics
SRPT
$1.68B
| $174K | 0.02% |
158
-45
| -22% | -$600 |
|
788
Upbound Group
UPBD
$1.23B
| $173K | 0.02% |
6,311
+5,644
| +846% | +$172K |
|
|
SPLK
789
PUT
DELISTED
Splunk Inc
SPLK
| $173K | 0.02% |
300
-26
| -8% | -$1.57K |
|
790
PUT
Consolidated Edison
ED
$41.6B
| $171K | 0.02% |
379
+195
| +106% | +$12.7K |
|
|
ESPR
791
PUT
DELISTED
Esperion Therapeutics
ESPR
| $171K | 0.02% |
163
+147
| +919% | +$9.49K |
|
792
CALL
Illumina
ILMN
$29.8B
| $171K | 0.02% |
147
-217
| -60% | -$40.9K |
|
793
Barrett Business Services
BBSI
$977M
| $170K | 0.02% |
15,876
+15,780
| +16,438% | +$143K |
|
794
IPG Photonics
IPGP
$4.09B
| $170K | 0.02% |
+1,842
| New | +$159K |
|
|
VNET
795
VNET Group
VNET
$2.21B
| $170K | 0.02% |
9,641
-4,946
| -34% | -$85.7K |
|
|
SCMP
796
DELISTED
Sucampo Pharmaceuticals, Inc.
SCMP
| $170K | 0.02% |
10,938
+10,109
| +1,219% | +$157K |
|
797
Honda
HMC
$36.3B
| $169K | 0.02% |
5,161
+3,396
| +192% | +$109K |
|
798
PUT
Mercado Libre
MELI
$91.2B
| $169K | 0.02% |
44
-64
| -59% | -$8.09K |
|
799
CALL
SLB Ltd
SLB
$70.6B
| $169K | 0.02% |
1,559
+63
| +4% | +$5.25K |
|
|
NSM
800
PUT
DELISTED
Nationstar Mortgage Holdings
NSM
| $169K | 0.02% |
191
-5
| -3% | -$137 |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.