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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2251
CALL
MKS Inc
MKSI
$22.2B
| $836K | ﹤0.01% |
76
-6
| -7% | -$629 |
|
2252
CALL
Idexx Laboratories
IDXX
$42.9B
| $835K | ﹤0.01% |
32
-14
| -30% | -$3.69K |
|
2253
CALL
Manulife Financial
MFC
$72.6B
| $835K | ﹤0.01% |
412
+293
| +246% | +$5.6K |
|
2254
CALL
Paysign
PAYS
$486M
| $835K | ﹤0.01% |
823
-132
| -14% | -$1.39K |
|
|
I
2255
DELISTED
INTELSAT S. A.
I
| $835K | ﹤0.01% |
118,851
+58,526
| +97% | +$920K |
|
|
SCS
2256
PUT
DELISTED
Steelcase
SCS
| $832K | ﹤0.01% |
407
+402
| +8,040% | +$7.45K |
|
2257
State Street Real Estate Select Sector SPDR ETF
XLRE
$8.69B
| $830K | ﹤0.01% |
21,478
+21,049
| +4,907% | +$814K |
|
2258
PUT
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $829K | ﹤0.01% |
143
+35
| +32% | +$1.23K |
|
2259
ProShares UltraShort S&P500
SDS
$406M
| $828K | ﹤0.01% |
1,334
-817
| -38% | -$561K |
|
|
HZNP
2260
PUT
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $828K | ﹤0.01% |
229
+77
| +51% | +$2.36K |
|
2261
Canadian Imperial Bank of Commerce
CM
$107B
| $827K | ﹤0.01% |
+19,886
| New | +$841K |
|
2262
CSX Corp
CSX
$98.6B
| $827K | ﹤0.01% |
34,290
-30,177
| -47% | -$714K |
|
2263
CALL
Glacier Bancorp
GBCI
$6.55B
| $827K | ﹤0.01% |
180
+177
| +5,900% | +$7.64K |
|
2264
CALL
Infosys
INFY
$45B
| $826K | ﹤0.01% |
801
+778
| +3,383% | +$7.83K |
|
|
DPLO
2265
CALL
DELISTED
DIPLOMAT PHARMACY, INC.
DPLO
| $826K | ﹤0.01% |
2,066
+2,033
| +6,161% | +$9.55K |
|
|
TBCH
2266
CALL
Turtle Beach Corp
TBCH
$239M
| $824K | ﹤0.01% |
872
+202
| +30% | +$1.98K |
|
2267
PUT
RBC Bearings
RBC
$18.8B
| $823K | ﹤0.01% |
+52
| New | +$8.41K |
|
2268
PUT
Kennametal
KMT
$2.68B
| $822K | ﹤0.01% |
223
+123
| +123% | +$4.12K |
|
2269
PUT
Upbound Group
UPBD
$1.19B
| $821K | ﹤0.01% |
285
+27
| +10% | +$706 |
|
|
JNPR
2270
PUT
DELISTED
Juniper Networks
JNPR
| $820K | ﹤0.01% |
333
-341
| -51% | -$8.39K |
|
2271
Cleveland-Cliffs
CLF
$6.81B
| $818K | ﹤0.01% |
+97,461
| New | +$748K |
|
|
EB
2272
CALL
DELISTED
Eventbrite
EB
| $818K | ﹤0.01% |
406
-534
| -57% | -$10.2K |
|
2273
CALL
Lantheus
LNTH
$6.82B
| $818K | ﹤0.01% |
399
+391
| +4,888% | +$7.91K |
|
2274
EQT Corp
EQT
$33.2B
| $817K | ﹤0.01% |
74,956
-22,865
| -23% | -$224K |
|
2275
PUT
Eastman Chemical
EMN
$7.8B
| $816K | ﹤0.01% |
103
-4
| -4% | -$308 |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.